What Are Tax Incentives and How Do They Work?

Tax incentives are provisions in the federal tax code that lower what you owe, or increase your refund, when you do something the government wants to encourage: going to college, paying for childcare, buying a home, investing in equipment, or hiring researchers. They come in three shapes—credits, deductions, and exclusions—and the dollar savings can range from a few hundred dollars to tens of thousands depending on which one applies and how much you spent.¹

The Three Types and How They Reduce Your Bill

Every federal tax incentive lives in Title 26 of the United States Code, the Internal Revenue Code. What separates them is where they hit your return.

Credits Cut the Tax Itself

A credit is a dollar-for-dollar reduction in the tax you owe. Owe $5,000, qualify for a $1,000 credit, pay $4,000. That is why credits are generally more valuable than deductions of the same size: they reduce your actual liability instead of the income figure used to calculate it.¹

Deductions Cut the Income That Gets Taxed

A deduction lowers the amount of income subject to tax. Earn $60,000, take a $10,000 deduction, pay tax on $50,000. The actual savings depend on your bracket. A filer in the 22% bracket saves $2,200 on that $10,000 deduction; a filer in the 12% bracket saves $1,200.²

Most filers take the standard deduction rather than itemizing. For the 2026 tax year, that is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.³

Exclusions Keep Income Off the Return Entirely

An exclusion prevents certain income from counting at all, rather than subtracting it after the fact. Employer-provided health insurance premiums and interest on municipal bonds are common examples. Personal exemptions, which used to let taxpayers exclude a set amount per household member, remain at zero for 2026 and were made permanent by the One, Big, Beautiful Bill.³

Refundable vs. Non-Refundable Credits

Once a credit takes your tax bill to zero, what happens next depends on whether the credit is refundable.

A refundable credit pays you the balance. Qualify for a $2,500 refundable credit but only owe $1,500, and the IRS sends you the remaining $1,000. The Earned Income Tax Credit is one of the best-known refundable credits.¹

A non-refundable credit can zero out your tax but no further; any leftover typically vanishes for that year. Some credits split the difference. The American Opportunity Tax Credit is partially refundable: up to 40% of the unused portion, capped at $1,000, can be refunded.⁴ Businesses have a different safety net: unused non-refundable credits reported on Form 3800 can generally be carried back one year and forward up to 20.⁵

Incentives Individuals Use Most Often

American Opportunity Tax Credit

This credit is worth up to $2,500 per eligible student for qualified tuition and expenses during the first four years of college. It covers 100% of the first $2,000 spent and 25% of the next $2,000. You need a modified adjusted gross income of $80,000 or less ($160,000 for joint filers) to claim the full amount, and it phases out entirely above $90,000 ($180,000 for joint filers).⁴

Child and Dependent Care Credit

If you pay someone to care for a child under 13, or a dependent who cannot care for themselves, so you can work, this credit offsets a percentage of the cost. Eligible expenses are capped at $3,000 for one qualifying individual and $6,000 for two or more. The One, Big, Beautiful Bill increased the maximum credit percentage to 50% for the lowest-income families, with the percentage phasing down as income rises.⁶

Mortgage Interest Deduction

Homeowners who itemize can deduct interest on mortgage debt up to $750,000, or $375,000 if married filing separately. The older $1,000,000 limit still applies to mortgages taken out before December 16, 2017. The $750,000 cap is now permanent and will not adjust for inflation going forward.⁷

Incentives Businesses Use Most Often

Section 179 and Bonus Depreciation

Section 179 lets a business deduct the full purchase price of equipment in the year it is placed in service instead of depreciating it over many years. For 2026, the maximum Section 179 deduction is $2,560,000, phasing out once total equipment purchases exceed $4,090,000.

On top of that, the One, Big, Beautiful Bill restored permanent 100% bonus depreciation for most qualifying property acquired after January 19, 2025. Businesses can elect a lower percentage (40% or 60% for certain long-production-period property) if a smaller first-year deduction is more useful.⁶

Research and Development Credit

The Section 41 credit rewards businesses that invest in technical experimentation and innovation inside the United States. It applies to researcher wages, supplies used in experiments, and payments to outside contractors for qualified research. The IRS expects project-level documentation: employee time records, project authorizations, progress reports, and lab data.⁸

Clean Electricity Investment Credit

The Inflation Reduction Act created a technology-neutral credit under Section 48E for qualified clean energy facilities and energy storage placed in service after 2024. The base credit is 6% of the qualifying investment and rises to 30% for projects meeting prevailing wage and registered apprenticeship requirements.⁹ Additional bonuses of up to 10 percentage points each apply for meeting domestic content standards or siting the project in an energy community.

The One, Big, Beautiful Bill sharply narrowed the window. New projects generally must have begun construction within 60 days of the law’s enactment and be placed in service by the end of 2028 to remain eligible.

Credits That Ended or Are Ending Under the 2025 Law

The One, Big, Beautiful Bill terminated or curtailed several incentives that individuals and businesses had been counting on. If you were planning around any of these, check the dates before you spend.

Residential Clean Energy Credit (Section 25D): not available for expenditures made after December 31, 2025.¹⁰
Energy Efficient Home Improvement Credit (Section 25C): not available for property placed in service after December 31, 2025.¹¹
New Clean Vehicle Credit (Section 30D) and Previously-Owned Clean Vehicle Credit (Section 25E): not available for vehicles acquired after September 30, 2025.¹²
Alternative Fuel Vehicle Refueling Property Credit (Section 30C): available for property placed in service through June 30, 2026.
Energy Efficient Commercial Buildings Deduction (Section 179D): available for property where construction begins through June 30, 2026.¹¹

The same law expanded a few benefits. The adoption credit became partially refundable up to $5,000 (indexed for inflation), the Child and Dependent Care Credit was permanently enhanced, and 100% bonus depreciation returned for business property.⁶

How to Claim an Incentive and What to Keep

Almost every incentive requires a specific form attached to your annual return. Individuals file on Form 1040; corporations use Form 1120.¹³ Common attachments include Form 8863 for education credits,¹⁴ Form 3800 to aggregate business credits, and Schedule A for itemized deductions like mortgage interest.

Documentation is where claims live or die. Missing records are one of the most common reasons the IRS denies a credit or deduction on audit. For education credits, you need the Form 1098-T from your school and its employer identification number.¹⁵ For the mortgage interest deduction, you rely on the Form 1098 from your lender. For the R&D credit, expect to produce project authorizations, employee time by project, supply and contract records, and progress reports.⁸

Keep supporting records for at least three years after filing. That is the standard audit window; if you underreport income by more than 25%, it stretches to six.¹⁶ Hold records longer when you claimed depreciation or later disposed of property tied to a credit.¹⁷ If you missed a credit in a prior year, you can generally file Form 1040-X within three years of filing the original return or two years of paying the tax, whichever is later.¹⁸

What It Costs to Get an Incentive Wrong

Claiming an incentive you do not qualify for triggers more than just paying the money back. The IRS imposes a 20% accuracy-related penalty on any underpayment caused by negligence or a substantial understatement of income tax, rising to 40% for gross valuation misstatements or undisclosed transactions lacking economic substance.¹⁹

Some credits also carry recapture rules. For investment credits on business energy property, the recapture period is five years. Dispose of the property or stop using it for its qualifying purpose in year one and you owe 100% of the credit back. The share drops 20 percentage points each following year: 80% in year two, 60% in year three, 40% in year four, and 20% in year five.²⁰ Businesses claiming Inflation Reduction Act clean energy credits also face separate penalties for missing prevailing wage and apprenticeship requirements.²¹

1
Internal Revenue Service. Tax Credits for Individuals: What They Mean and How They Can Help Refunds
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Internal Revenue Service. Deductions for Individuals: What They Mean and the Difference Between Standard and Itemized Deductions
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Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
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Internal Revenue Service. American Opportunity Tax Credit
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Office of the Law Revision Counsel. 26 U.S. Code 39 – Carryback and Carryforward of Unused Credits
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Internal Revenue Service. One, Big, Beautiful Bill Provisions
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Internal Revenue Service. Publication 936 (2025), Home Mortgage Interest Deduction
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Internal Revenue Service. Audit Techniques Guide: Credit for Increasing Research Activities IRC 41 – Substantiation and Recordkeeping
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Internal Revenue Service. Clean Electricity Investment Credit
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Internal Revenue Service. Residential Clean Energy Credit
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Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under the OBBB
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Internal Revenue Service. Clean Vehicle Tax Credits
13
Internal Revenue Service. About Form 1120, U.S. Corporation Income Tax Return
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Internal Revenue Service. About Form 8863, Education Credits (American Opportunity and Lifetime Learning Credits)
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Internal Revenue Service. Education Credits: American Opportunity Tax Credit (AOTC) and Lifetime Learning Credit (LLC)
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Internal Revenue Service. Time IRS Can Assess Tax
17
Internal Revenue Service. IRS Audits
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Internal Revenue Service. Time You Can Claim a Credit or Refund
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Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments
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Office of the Law Revision Counsel. 26 U.S. Code 50 – Other Special Rules
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U.S. Department of Labor. Prevailing Wage and the Inflation Reduction Act