9+ QIP Definition: Understanding Qualified Improvement Property


9+ QIP Definition: Understanding Qualified Improvement Property

Inside structural enhancements made to nonresidential buildings, excluding prices for enlargement, elevators, escalators, or inner structural framework modifications, are categorized as certified enchancment property (QIP). As an illustration, renovations to the inside of an workplace constructing, resembling new flooring, lighting, or HVAC methods, would usually fall beneath this classification. Nonetheless, including a brand new wing to the constructing or putting in a brand new elevator wouldn’t.

This categorization is critical for tax functions, impacting depreciation deductions. Understanding these distinctions permits companies to optimize tax methods and probably speed up price restoration for eligible enhancements. Traditionally, the tax remedy of QIP has undergone modifications, impacting depreciation intervals and strategies. Being conscious of present rules is essential for correct monetary planning and compliance.

Additional exploration of this matter will delve into particular IRS tips, eligibility standards, and related tax varieties. Moreover, examples of frequent QIP tasks and techniques for maximizing depreciation advantages might be mentioned.

1. Enchancment

Inside the context of certified enchancment property (QIP), “enchancment” signifies particular alterations to an current nonresidential constructing that improve its worth, lengthen its helpful life, or adapt it to a brand new operate. This idea is central to understanding QIP and its tax implications. Not all constructing modifications qualify as enhancements beneath this definition; particular standards have to be met.

  • Betterment

    Betterments improve the constructing past its authentic situation. Examples embody putting in a brand new HVAC system for improved local weather management or changing a worn-out roof with a extra sturdy materials. These betterments transcend easy repairs and contribute to the constructing’s total worth and longevity, making them probably qualifying enhancements for QIP.

  • Restoration

    Restoration returns a deteriorated portion of the constructing to its authentic performance. Repairing a broken wall or changing damaged home windows are examples of restoration. Whereas essential for upkeep, these actions do not usually qualify as enhancements beneath QIP until they contain vital upgrades or modernization past the unique state.

  • Adaptation for a New Use

    Modifying a constructing’s inside to accommodate a special operate constitutes an enchancment. As an illustration, changing warehouse area into workplace suites or reworking a retail space right into a restaurant requires substantial alterations that qualify as enhancements for QIP functions. This adaptation necessitates vital modifications to the constructing’s structure and infrastructure.

  • Distinct from Repairs and Upkeep

    Routine repairs and upkeep, resembling fixing leaks or repainting partitions, don’t qualify as enhancements. These actions are needed to take care of the constructing’s current situation however don’t improve its worth or lengthen its helpful life considerably. The excellence between restore and enchancment is essential for figuring out QIP eligibility.

Understanding these totally different aspects of “enchancment” is essential for precisely figuring out QIP and making use of the suitable tax depreciation guidelines. The excellence between repairs, upkeep, and enhancements instantly impacts a enterprise’s capacity to assert tax advantages associated to constructing alterations. Cautious consideration of those distinctions ensures compliance and optimizes tax methods.

2. Property

Inside the context of certified enchancment property (QIP), “property” refers particularly to the eligible constructing itself, encompassing the bodily construction and its integral parts. Understanding the traits that outline eligible property is crucial for precisely making use of QIP rules. The property have to be nonresidential, that means it’s not used for dwelling functions. This excludes condo buildings, single-family properties, and different residential constructions from QIP classification. Moreover, the property will need to have undergone enhancements, as outlined inside the QIP guidelines, to be thought of. These enhancements have to be made to the inside parts of the constructing and can’t embody structural framework alterations, constructing enlargements, or the addition of elevators or escalators.

The character of the property performs a big position in figuring out QIP eligibility. As an illustration, enhancements made to a leased workplace area inside a bigger business constructing may qualify as QIP, assuming all different standards are met. Nonetheless, enhancements made to frequent areas shared by a number of tenants inside the identical constructing might not qualify. Equally, enhancements made to a retail retailer inside a shopping center is likely to be eligible, whereas enhancements to the mall’s shared parking construction wouldn’t. These distinctions spotlight the significance of clearly figuring out the particular property being improved when assessing QIP applicability. Misclassifying the property can result in incorrect tax calculations and potential compliance points.

A exact understanding of the “property” element of the QIP definition is key for correct tax planning and compliance. This understanding hinges on differentiating between residential and nonresidential properties, recognizing eligible inside enhancements versus excluded exterior or structural modifications, and discerning between tenant-specific enhancements and customary space upgrades. Misinterpretations can result in vital monetary and authorized ramifications, underscoring the necessity for cautious consideration of the property’s nature and the particular enhancements made when making use of QIP rules.

3. Certified

The time period “certified,” inside the context of certified enchancment property (QIP), signifies that the property meets particular standards established by the Inside Income Service (IRS) to be eligible for sure tax advantages, primarily accelerated depreciation. Understanding these {qualifications} is essential for precisely making use of the QIP guidelines and maximizing related tax benefits. The “certified” designation hinges on a number of key elements regarding the character of the development, the kind of property, and the timing of the development.

  • Enchancment Sort

    The enhancements have to be to the inside parts of a nonresidential constructing and should not contain enlargement, elevators, escalators, or inner structural framework modifications. For instance, inside renovations like new flooring, lighting, or HVAC methods typically qualify, whereas including a brand new wing to the constructing or putting in a brand new elevator doesn’t. This distinction ensures that the tax advantages are directed in the direction of enhancements that improve the constructing’s performance and worth with out essentially altering its construction.

  • Property Sort

    The property have to be nonresidential, that means it isn’t used as a dwelling. This excludes condo buildings, single-family properties, and different residential constructions from QIP classification. A business workplace constructing, a retail retailer, or a warehouse are examples of properties that will qualify, supplied the opposite standards are met. The nonresidential requirement aligns the QIP tax advantages with investments in enterprise and business properties.

  • Positioned-in-Service Date

    The “placed-in-service” date, the date when the improved property is prepared and out there to be used, is essential for figuring out eligibility for particular tax provisions. Modifications in tax regulation over time have impacted how QIP is handled for depreciation functions. Understanding the relevant guidelines primarily based on the placed-in-service date is essential for correct tax calculations and compliance. For instance, totally different depreciation intervals and strategies might apply relying on when the development was positioned in service.

  • Tax Implications

    The “certified” standing permits companies to deduct a bigger portion of the development prices over a shorter interval, impacting money stream and total tax legal responsibility. Accelerated depreciation gives a big monetary benefit by lowering taxable earnings within the early years of the development’s life. This accelerated price restoration can unlock capital for different enterprise investments. Precisely making use of the QIP guidelines is crucial to understand these tax advantages absolutely.

These qualifying elements work in live performance to outline QIP and decide its eligibility for favorable tax remedy. Misunderstanding or overlooking any of those points can result in incorrect utility of the QIP guidelines and probably negate the related tax advantages. Subsequently, cautious consideration of every component is paramount for companies looking for to maximise the monetary benefits of QIP.

4. Nonresidential

The “nonresidential” attribute is a cornerstone of the certified enchancment property (QIP) definition, instantly impacting its eligibility for particular tax advantages. This classification distinguishes properties used for enterprise or business functions from residential dwellings, limiting the appliance of QIP guidelines and related tax benefits to the previous. Understanding this distinction is essential for correct utility of the QIP definition and for efficient tax planning.

  • Defining Nonresidential Use

    Nonresidential properties are these primarily used for income-generating actions, resembling workplaces, retail shops, warehouses, and factories. They’re distinct from residential properties, that are primarily used for dwelling functions. A constructing’s supposed function, reasonably than its present occupancy standing, usually determines its classification. For instance, a vacant workplace constructing stays labeled as nonresidential even when unoccupied. This distinction is necessary for figuring out QIP eligibility.

  • Exclusions from Nonresidential Classification

    Sure property sorts, even when used for enterprise functions, are particularly excluded from the nonresidential classification for QIP. These embody properties used as residential rental property, resembling condo buildings and single-family properties. Moreover, motels, motels, and different lodging services are additionally usually excluded, even when they incorporate some business-related actions. These exclusions additional refine the scope of QIP and its applicability.

  • Influence on QIP Eligibility

    The nonresidential requirement is a elementary qualifier for QIP. Enhancements made to residential properties, no matter their nature, don’t qualify for QIP remedy. This distinction underscores the coverage intent behind QIP, which is to incentivize funding in business and enterprise properties. Appropriately classifying a property as nonresidential is crucial for figuring out QIP eligibility and accessing related tax advantages.

  • Blended-Use Properties

    The classification of mixed-use properties, which comprise each residential and nonresidential areas, requires cautious consideration. Solely the enhancements made to the nonresidential parts of such properties might qualify for QIP remedy. As an illustration, renovations to the workplace areas inside a mixed-use constructing may qualify as QIP, whereas enhancements to the residential residences inside the identical constructing wouldn’t. This nuanced method requires exact identification of the improved areas inside a mixed-use property to find out QIP applicability.

The “nonresidential” facet of QIP considerably restricts the scope of eligible properties, focusing the tax advantages on enhancements to buildings used for enterprise or business functions. Understanding this essential distinction is paramount for correct utility of the QIP guidelines, making certain compliance and maximizing the supposed tax benefits. Misclassifying a property can result in incorrect utility of depreciation guidelines and potential authorized ramifications, highlighting the significance of cautious consideration of the property’s use in figuring out QIP eligibility.

5. Inside Enhancements

The “inside enhancements” element of the certified enchancment property (QIP) definition performs a essential position in figuring out eligibility for related tax advantages. This qualification restricts the scope of QIP to enhancements made inside the constructing’s inside, excluding structural modifications, exterior alterations, and particular constructing methods. This distinction displays the legislative intent to incentivize investments that improve a constructing’s performance and usefulness reasonably than its elementary construction or footprint. Understanding this distinction is essential for correct utility of QIP guidelines and efficient tax planning.

A number of examples illustrate the sensible utility of this idea. Renovations to workplace areas, resembling putting in new flooring, lighting, or HVAC methods, usually qualify as inside enhancements. Equally, enhancements to retail areas, together with new show fixtures, shelving, and inside finishes, typically fall beneath the QIP umbrella. Nonetheless, including a brand new wing to the constructing, increasing the car parking zone, or changing the roof wouldn’t qualify as inside enhancements, even when they improve the property’s worth. These distinctions spotlight the significance of specializing in inside alterations when contemplating QIP eligibility. As an illustration, changing a warehouse area into particular person workplace suites by including inside partitions and partitions qualifies, whereas establishing a brand new loading dock outdoors the warehouse wouldn’t. These real-world functions show the sensible implications of the “inside enhancements” requirement.

In abstract, the “inside enhancements” qualification is a essential component in defining QIP. It narrows the scope of eligible enhancements to these made inside a constructing’s inside, excluding structural modifications, exterior renovations, and particular constructing methods. This distinction has vital sensible implications for companies looking for to maximise tax advantages related to constructing enhancements. Correct identification of inside enhancements is crucial for correct utility of QIP guidelines, making certain compliance and optimizing tax methods. Failure to know this distinction can result in incorrect tax calculations and potential compliance points, underscoring the significance of a transparent understanding of the “inside enhancements” idea inside the QIP definition.

6. Excludes structural framework

The exclusion of structural framework modifications from the definition of certified enchancment property (QIP) is a essential facet of its utility. This exclusion clarifies that alterations to a constructing’s core structural parts don’t qualify for the accelerated depreciation advantages related to QIP. This delineation stems from the underlying precept that QIP is meant to incentivize enhancements that improve a constructing’s performance and inside surroundings, reasonably than elementary alterations to its load-bearing construction. This distinction impacts how constructing enhancements are categorized for tax functions and influences funding selections.

Think about a business workplace constructing present process renovations. Inside enhancements resembling new partitions, flooring, and lighting qualify as QIP. Nonetheless, reinforcing the constructing’s basis, including load-bearing partitions, or changing structural beams wouldn’t qualify. Equally, in a retail setting, putting in new show circumstances and checkout counters qualifies, whereas increasing the constructing’s footprint by including new structural helps doesn’t. These examples underscore the sensible implications of the “structural framework” exclusion. This understanding permits companies to precisely categorize enchancment bills and optimize their tax methods. Furthermore, it gives readability for building and renovation planning, enabling knowledgeable selections aligned with tax rules.

In abstract, the exclusion of structural framework modifications from the QIP definition serves to refine its scope and focus its utility on inside, non-structural enhancements. This distinction is essential for correct tax planning and compliance. Understanding this facet of QIP permits companies to distinguish between eligible and ineligible enhancements, maximize tax advantages, and guarantee compliance with IRS rules. This data is key for sound monetary decision-making within the context of constructing enhancements and renovations.

7. Excludes Constructing Enlargement

The exclusion of constructing enlargement from the definition of certified enchancment property (QIP) is a essential issue influencing its tax implications. This stipulation clarifies that expansions to a constructing’s current footprint don’t qualify for the accelerated depreciation advantages related to QIP. This distinction encourages enhancements inside current constructions reasonably than new building or expansions, specializing in enhancing performance inside an outlined area. Understanding this distinction is crucial for correct tax planning and compliance.

  • Defining Constructing Enlargement

    Constructing enlargement refers to any improve in a constructing’s sq. footage or quantity. This consists of including new wings, extending current flooring, or rising the constructing’s peak. Such expansions signify vital structural modifications that alter the basic footprint of the constructing, differentiating them from inside enhancements that qualify as QIP. For instance, including a brand new story to an workplace constructing constitutes enlargement, whereas renovating current workplace area inside the present construction doesn’t.

  • Distinction from Inside Enhancements

    QIP focuses on enhancements made inside the current boundaries of a constructing. This consists of renovations, upgrades, and modifications to inside areas, methods, and finishes. Enlargement, conversely, includes increasing the constructing’s bodily footprint past its authentic boundaries. This distinction is essential for figuring out whether or not a particular enchancment qualifies for QIP remedy. For instance, reworking a restroom inside a retail retailer qualifies as QIP, whereas establishing an addition to the shop to create extra retail area doesn’t.

  • Influence on Depreciation

    Excluding constructing enlargement from QIP impacts how these prices are depreciated for tax functions. Whereas QIP enhancements typically qualify for accelerated depreciation strategies, permitting companies to deduct a bigger portion of the development prices over a shorter interval, enlargement prices are usually topic to longer depreciation intervals. This distinction in depreciation remedy considerably impacts a enterprise’s tax legal responsibility and money stream projections, emphasizing the significance of correct classification.

  • Strategic Planning Implications

    Understanding the exclusion of constructing enlargement from QIP informs strategic decision-making for constructing enhancements. Companies should fastidiously contemplate whether or not to put money into increasing their current footprint versus bettering current areas. This choice has vital tax implications and requires weighing the advantages of accelerated depreciation towards the necessity for extra area. Analyzing the long-term monetary affect of every possibility is essential for optimizing funding methods.

The exclusion of constructing enlargement from QIP reinforces the concentrate on inside enhancements and their position in enhancing a constructing’s performance and worth inside its current footprint. This distinction is essential for correct utility of tax rules and efficient monetary planning. By understanding this facet of QIP, companies could make knowledgeable selections about constructing enhancements and optimize their tax methods accordingly. This data permits them to align their funding selections with the relevant tax guidelines, maximizing monetary advantages and making certain compliance.

8. Excludes Elevators/Escalators

The exclusion of elevators and escalators from the definition of certified enchancment property (QIP) is a key issue shaping its utility and tax implications. This distinction stems from the precept that QIP focuses on enhancements enhancing a constructing’s inside usability and performance, reasonably than main structural or system additions. Understanding this exclusion is essential for correct tax planning and compliance.

  • Capitalization versus Expense Deduction

    Excluding elevators and escalators from QIP impacts how their prices are handled for tax functions. QIP enhancements usually qualify for accelerated depreciation, permitting companies to deduct a bigger portion of the development prices over a shorter time. Nonetheless, prices related to elevators and escalators are typically capitalized and depreciated over an extended interval, impacting tax legal responsibility and money stream. This distinction in remedy necessitates cautious categorization of enchancment bills.

  • Deal with Inside Usability

    QIP emphasizes enhancements that improve the usability and performance of inside areas inside a constructing’s current footprint. Elevators and escalators, whereas contributing to accessibility, are thought of vital constructing methods reasonably than inside enhancements. This distinction aligns with QIP’s concentrate on inside renovations, upgrades, and modifications, reasonably than main system installations impacting the constructing’s core construction or methods. For instance, renovating workplace areas inside a constructing qualifies as QIP, whereas putting in a brand new elevator system doesn’t.

  • Structural and System Issues

    Elevators and escalators contain advanced structural and system integrations, typically requiring vital modifications to a constructing’s framework. QIP excludes structural alterations, specializing in enhancements inside the current framework. This distinction highlights the distinction between enhancing inside areas and altering the constructing’s core construction or methods. This distinction is essential for correct categorization of enchancment tasks and utility of applicable tax guidelines.

  • Influence on Funding Choices

    The exclusion of elevators and escalators from QIP influences funding selections associated to constructing enhancements. Companies should weigh the advantages of improved accessibility towards the totally different depreciation remedy and tax implications. This consideration impacts long-term monetary planning and requires cautious analysis of prices and advantages. Understanding this distinction ensures alignment between funding selections and tax methods.

The exclusion of elevators and escalators from QIP clarifies its scope and reinforces the concentrate on inside enhancements that improve a constructing’s performance inside its current footprint and structural framework. This distinction is crucial for correct tax planning, compliance, and strategic decision-making associated to constructing investments. By understanding this facet of QIP, companies can optimize their tax methods and make knowledgeable selections relating to constructing enhancements.

9. Tax Depreciation

Tax depreciation performs a vital position within the monetary evaluation of certified enchancment property (QIP). Depreciation permits companies to deduct a portion of the price of qualifying enhancements over a specified interval, lowering taxable earnings and offering a big tax profit. The connection between tax depreciation and QIP lies within the accelerated depreciation strategies typically out there for QIP belongings. This accelerated depreciation permits companies to recuperate a bigger portion of their funding sooner, bettering money stream and probably enhancing the return on funding. Understanding the interaction between QIP and tax depreciation is essential for knowledgeable decision-making and maximizing monetary advantages.

The precise depreciation strategies and restoration intervals relevant to QIP have developed as a result of modifications in tax regulation. For instance, the Tax Cuts and Jobs Act of 2017 considerably impacted the depreciation of QIP, altering restoration intervals and strategies. Preserving abreast of present tax rules is paramount for correct depreciation calculations and compliance. Think about a enterprise renovating an workplace area with new lighting, flooring, and HVAC methods, all qualifying as QIP. Making use of the proper depreciation methodology permits the enterprise to deduct a considerable portion of those enchancment prices over a shorter interval than if the enhancements weren’t categorized as QIP. This accelerated depreciation instantly impacts the enterprise’s tax legal responsibility and monetary projections.

Correct understanding and utility of tax depreciation guidelines for QIP are important for sound monetary administration. This understanding permits companies to leverage the tax advantages related to QIP, optimize price restoration methods, and improve funding returns. Failure to use the proper depreciation strategies can result in missed tax benefits and potential compliance points. Subsequently, cautious consideration of tax depreciation is an integral facet of managing QIP and maximizing its monetary advantages inside the broader context of tax planning and compliance.

Ceaselessly Requested Questions on Certified Enchancment Property

This part addresses frequent inquiries relating to certified enchancment property (QIP) to supply readability on its definition, utility, and tax implications.

Query 1: How does QIP differ from different constructing enhancements?

QIP particularly refers to inside, non-structural enhancements to nonresidential buildings. It excludes structural framework modifications, constructing enlargements, elevators, escalators, and enhancements to residential properties. Different constructing enhancements might fall beneath totally different depreciation classes with various tax remedies.

Query 2: What’s the significance of the “placed-in-service” date for QIP?

The placed-in-service date, the date when the improved property is prepared and out there to be used, determines the relevant depreciation guidelines and tax advantages. Tax legal guidelines governing QIP have modified over time, making the placed-in-service date essential for figuring out eligibility for particular depreciation strategies and restoration intervals.

Query 3: How does the classification of a property as “nonresidential” affect QIP eligibility?

The nonresidential requirement is key to QIP eligibility. Solely enhancements made to properties used primarily for enterprise or business functions qualify. Residential properties, together with rental properties like condo buildings, are excluded from QIP classification.

Query 4: Are there particular documentation necessities for claiming QIP depreciation?

Sustaining correct documentation is essential for substantiating QIP claims. Information ought to embody invoices, contracts, and different documentation demonstrating the character of the enhancements, the date positioned in service, and the prices incurred. Thorough documentation helps correct tax reporting and helps keep away from potential audit points.

Query 5: What are the potential tax advantages of appropriately classifying enhancements as QIP?

Appropriate QIP classification permits companies to leverage accelerated depreciation strategies, resulting in vital tax benefits. Accelerated depreciation reduces taxable earnings within the early years of the development’s life, bettering money stream and probably enhancing funding returns. Correct classification is essential for maximizing these tax advantages.

Query 6: The place can one discover further info and steering on QIP rules?

The Inside Income Service (IRS) gives detailed steering on QIP rules, together with publications, varieties, and directions. Consulting with a certified tax skilled can be beneficial for particular conditions and sophisticated eventualities. Staying knowledgeable about present rules is crucial for correct QIP classification and compliance.

Understanding these points of QIP is crucial for knowledgeable decision-making and compliance with tax rules. Correct utility of QIP guidelines ensures companies can maximize related tax advantages and optimize their monetary methods.

Additional exploration of QIP will delve into particular examples, case research, and sensible utility eventualities to supply a complete understanding of its affect on enterprise funds and tax planning.

Sensible Ideas for Using Certified Enchancment Property (QIP) Deductions

Navigating the complexities of certified enchancment property (QIP) deductions requires a strategic method. The next ideas provide sensible steering for maximizing the tax advantages related to QIP.

Tip 1: Preserve Meticulous Information:

Detailed information are important for substantiating QIP claims. Retain all invoices, contracts, architectural plans, and engineering stories associated to the enhancements. Complete documentation facilitates correct price allocation and gives assist within the occasion of an audit. This organized method streamlines the method and minimizes potential issues.

Tip 2: Seek the advice of with a Certified Tax Advisor:

Tax legal guidelines governing QIP could be intricate. Consulting a certified tax advisor ensures correct interpretation and utility of present rules. Skilled steering helps navigate advanced eventualities, determine eligible enhancements, and optimize depreciation methods for max tax advantages.

Tip 3: Distinguish Repairs from Enhancements:

Precisely differentiate between repairs and enhancements. Repairs restore a property to its prior situation, whereas enhancements improve its worth, lengthen its life, or adapt it for a brand new use. Solely enhancements qualify for QIP remedy. Misclassifying repairs as enhancements can result in inaccurate tax calculations and potential penalties.

Tip 4: Perceive Positioned-in-Service Dates:

The placed-in-service date determines relevant depreciation guidelines. Pay attention to modifications in tax regulation affecting QIP and make sure the appropriate depreciation methodology and restoration interval are utilized primarily based on the placed-in-service date of the enhancements. This accuracy is essential for maximizing tax advantages and sustaining compliance.

Tip 5: Think about Value Segregation Research:

For advanced tasks, a value segregation research could be helpful. These research analyze constructing parts and classify them for correct depreciation. Value segregation can determine further QIP belongings and optimize depreciation methods, resulting in vital tax financial savings. This method gives an in depth breakdown of prices and ensures correct categorization.

Tip 6: Assessment Lease Agreements Rigorously:

For leased properties, fastidiously overview lease agreements to find out duty for enhancements and related tax implications. Understanding lease phrases helps make clear QIP eligibility and ensures applicable allocation of prices and tax advantages. This proactive method avoids potential disputes and ensures compliance.

By implementing these methods, companies can successfully leverage QIP deductions, optimize tax planning, and improve monetary outcomes. These sensible ideas present a framework for navigating the complexities of QIP and maximizing related advantages.

The next conclusion summarizes key takeaways and emphasizes the significance of strategic tax planning involving QIP.

Conclusion

Certified enchancment property (QIP) represents a big space inside tax regulation, impacting funding selections and monetary methods associated to nonresidential constructing enhancements. A exact understanding of its definition, encompassing eligible property sorts, qualifying enhancements, and exclusions, is essential for correct tax planning and compliance. This exploration has highlighted the nuances of QIP, emphasizing the excellence between structural and non-structural enhancements, the significance of the placed-in-service date, and the implications for depreciation. The complexities surrounding QIP underscore the necessity for cautious consideration and meticulous record-keeping.

Strategic utility of QIP ideas permits companies to optimize tax advantages and improve monetary outcomes. Staying knowledgeable about evolving tax rules and looking for skilled steering are important for navigating the intricacies of QIP and maximizing its benefits. Correct classification of enhancements as QIP unlocks vital depreciation advantages, impacting money stream and total profitability. This understanding empowers companies to make knowledgeable selections, decrease tax liabilities, and obtain long-term monetary targets by way of strategic utilization of QIP provisions.