U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 26Chapter IPart 1 - PART 1—INCOME TAXES

NORMAL TAXES AND SURTAXES
§ 1.1-1 - Income tax on individuals.
§ 1.1-2 - Limitation on tax.
§ 1.1-3 - Change in rates applicable to taxable year.
§ 1.1(h)-1 - Capital gains look-through rule for sales or exchanges of interests in a partnership, S corporation, or trust.
§ 1.1(i)-1T - Questions and answers relating to the tax on unearned income certain minor children (Temporary).
§ 1.2-1 - Tax in case of joint return of husband and wife or the return of a surviving spouse.
§ 1.2-2 - Definitions and special rules.
§ 1.3-1 - Application of optional tax.
§ 1.4-1 - Number of exemptions.
§ 1.4-2 - Elections.
§ 1.4-3 - Husband and wife filing separate returns.
§ 1.4-4 - Short taxable year caused by death.
§ 1.0-1 - Internal Revenue Code of 1954 and regulations.

TAX ON CORPORATIONS
§ 1.11-1 - Tax on corporations.

CHANGES IN RATES DURING A TAXABLE YEAR
§ 1.15-1 - Changes in rate during a taxable year.
§ 1.21-1 - Expenses for household and dependent care services necessary for gainful employment.
§ 1.21-2 - Limitations on amount creditable.
§ 1.21-3 - Special rules applicable to married taxpayers.
§ 1.21-4 - Payments to certain related individuals.
§ 1.24-1 - Partial credit allowed for certain other dependents.
§ 1.25-1T - Credit for interest paid on certain home mortgages (Temporary).
§ 1.25-2T - Amount of credit (Temporary).
§ 1.25-3 - Qualified mortgage credit certificate.
§ 1.25-3T - Qualified mortgage credit certificate (Temporary).
§ 1.25-4T - Qualified mortgage credit certificate program (Temporary).
§ 1.25-5T - Limitation on aggregate amount of mortgage credit certificates (Temporary).
§ 1.25-6T - Form of qualified mortgage credit certificate (Temporary).
§ 1.25-7T - Public notice (Temporary).
§ 1.25-8T - Reporting requirements (Temporary).
§ 1.25A-0 - Table of contents.
§ 1.25A-1 - Calculation of education tax credit and general eligibility requirements.
§ 1.25A-2 - Definitions.
§ 1.25A-3 - Hope Scholarship Credit.
§ 1.25A-4 - Lifetime Learning Credit.
§ 1.25A-5 - Special rules relating to characterization and timing of payments.
§ 1.25E-0 - Table of contents.
§ 1.25E-1 - Credit for previously-owned clean vehicles.
§ 1.25E-2 - Special rules.
§ 1.25E-3 - Transfer of credit.
§ 1.28-0 - Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents.
§ 1.28-1 - Credit for clinical testing expenses for certain drugs for rare diseases or conditions.

CREDITS AGAINST TAX
CREDITS ALLOWABLE UNDER SECTIONS 30 THROUGH 45D
§ 1.30-1 - Definition of qualified electric vehicle and recapture of credit for qualified electric vehicle.
§§ 1.30C-1—1.30C-2 - §[Reserved]
§ 1.30C-3 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.30D-0 - Table of contents.
§ 1.30D-1 - Credit for new clean vehicles.
§ 1.30D-2 - Definitions for purposes of section 30D.
§ 1.30D-3 - Critical minerals and battery components requirements.
§ 1.30D-4 - Special rules.
§ 1.30D-5 - Transfer of credit.
§ 1.30D-6 - Foreign entity of concern restriction.
§ 1.31-1 - Credit for tax withheld on wages.
§ 1.31-2 - Credit for “special refunds” of employee social security tax.
§ 1.32-2 - Earned income credit for taxable years beginning after December 31, 1978.
§ 1.32-3 -
§ 1.34-1 - Special rule for owners of certain business entities.
§ 1.35-1 - Partially tax-exempt interest received by individuals.
§ 1.35-2 - Taxpayers not entitled to credit.
§ 1.36B-0 - Table of contents.
§ 1.36B-1 - Premium tax credit definitions.
§ 1.36B-2 - Eligibility for premium tax credit.
§ 1.36B-3 - Computing the premium assistance credit amount.
§ 1.36B-4 - Reconciling the premium tax credit with advance credit payments.
§ 1.36B-5 - Information reporting by Exchanges.
§ 1.36B-6 - Minimum value.
§ 1.37-1 - General rules for the credit for the elderly.
§ 1.37-2 - Credit for individuals age 65 or over.
§ 1.37-3 - Credit for individuals under age 65 who have public retirement system income.

GENERAL BUSINESS CREDITS
§ 1.42-15 - Available unit rule.
§ 1.42-16 - Eligible basis reduced by federal grants.
§ 1.42-17 - Qualified allocation plan.
§ 1.42-18 - Qualified contracts.
§ 1.42-19 - Average income test.
§ 1.42-19T - Average income test (temporary).
§ 1.42A-1 - General tax credit for taxable years ending after December 31, 1975, and before January 1, 1979.
§ 1.43-0 - Table of contents.
§ 1.43-1 - The enhanced oil recovery credit—general rules.
§ 1.43-2 - Qualified enhanced oil recovery project.
§ 1.43-3 - Certification
§ 1.43-4 - Qualified enhanced oil recovery costs.
§ 1.43-5 - At-risk limitation. [Reserved]
§ 1.43-6 - Election out of section 43.
§ 1.43-7 - Effective date of regulations.
§ 1.44-1 - Allowance of credit for purchase of new principal residence after March 12, 1975, and before January 1, 1977.
§ 1.44-2 - Property to which credit for purchase of new principal residence applies.
§ 1.44-3 - Certificate by seller.
§ 1.44-4 - Recapture for certain dispositions.
§ 1.44-5 - Definitions.
§ 1.44B-1 - Credit for employment of certain new employees.
§ 1.38-1 - Investment in certain depreciable property.
§ 1.40-1 - Questions and answers relating to the meaning of the term “qualified mixture” in section 40(b)(1).
§ 1.41-0 - Table of contents.
§ 1.41-1 - Credit for increasing research activities.
§ 1.41-2 - Qualified research expenses.
§ 1.41-3 - Base amount for taxable years beginning on or after January 3, 2001.
§ 1.41-4 - Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003.
§ 1.41-4A - Qualified research for taxable years beginning before January 1, 1986.
§ 1.41-5 - Basic research for taxable years beginning after December 31, 1986. [Reserved]
§ 1.41-5A - Basic research for taxable years beginning before January 1, 1987.
§ 1.41-6 - Aggregation of expenditures.
§ 1.41-7 - Special rules.
§ 1.41-8 - Alternative incremental credit applicable for taxable years beginning on or before December 31, 2008.
§ 1.41-9 - Alternative simplified credit.
§ 1.42-0 - Table of contents.
§ 1.42-0T - Table of contents.
§ 1.42-1 - Limitation on low-income housing credit allowed with respect to qualified low-income buildings receiving housing credit allocations from a State or local housing credit agency.
§ 1.42-1T - Limitation on low-income housing credit allowed with respect to qualified low-income buildings receiving housing credit allocations from a State or local housing credit agency (temporary).
§ 1.42-2 - [Reserved]
§ 1.42-3 - Treatment of buildings financed with proceeds from a loan under an Affordable Housing Program established pursuant to section 721 of the Financial Institutions Reform, Recovery, and Enforcement Act of 1989 (FIRREA).
§ 1.42-4 - Application of not-for-profit rules of section 183 to low-income housing credit activities.
§ 1.42-5 - Monitoring compliance with low-income housing credit requirements.
§ 1.42-6 - Buildings qualifying for carryover allocations.
§ 1.42-7 - Substantially bond-financed buildings. [Reserved]
§ 1.42-8 - Election of appropriate percentage month.
§ 1.42-9 - For use by the general public.
§ 1.42-10 - Utility allowances.
§ 1.42-11 - Provision of services.
§ 1.42-12 - Effective dates and transitional rules.
§ 1.42-13 - Rules necessary and appropriate; housing credit agencies' correction of administrative errors and omissions.
§ 1.42-14 - Allocation rules for post-2000 State housing credit ceiling amount.

RESEARCH CREDIT—FOR TAXABLE YEARS BEGINNING BEFORE JANUARY 1, 1990
§ 1.41-0A - Table of contents.
§ 1.41-3A - Base period research expense.

RULES FOR COMPUTING CREDIT FOR INVESTMENT IN CERTAIN DEPRECIABLE PROPERTY
§ 1.45-0 - Table of contents.
§§ 1.45-1—1.45-5 - §[Reserved]
§ 1.45-6 - Increased credit amount.
§ 1.45-7 - Prevailing wage requirements.
§ 1.45-8 - Apprenticeship requirements.
§§ 1.45-9-1.45.11 - §[Reserved]
§ 1.45-12 - Recordkeeping and reporting.
§ 1.45D-0 - Table of contents.
§ 1.45D-1 - New markets tax credit.
§ 1.45G-0 - Table of contents for the railroad track maintenance credit rules.
§ 1.45G-1 - Railroad track maintenance credit.
§§ 1.45L-1-1.45L-2 - §[Reserved]
§ 1.45L-3 - Rules relating to the increased credit amount for prevailing wage.
§ 1.45Q-0 - Table of Contents
§ 1.45Q-1 - Credit for Carbon Oxide Sequestration.
§ 1.45Q-2 - Definitions for Purposes of §through 1.45Q-5.
§ 1.45Q-3 - Secure Geological Storage.
§ 1.45Q-4 - Utilization of Qualified Carbon Oxide.
§ 1.45Q-5 - Recapture of Credit.
§ 1.45Q-6 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.45R-0 - Table of contents.
§ 1.45R-1 - Definitions.
§ 1.45R-2 - Eligibility for the credit.
§ 1.45R-3 - Calculating the credit.
§ 1.45R-4 - Uniform percentage of premium paid.
§ 1.45R-5 - Claiming the credit.
§§ 1.45U-1-1.45U-2 - §[Reserved]
§ 1.45U-3 - Rules relating to the increased credit amount for prevailing wage.
§ 1.45V-0 - Table of contents.
§ 1.45V-1 - Credit for production of clean hydrogen.
§ 1.45V-2 - Special rules.
§ 1.45V-3 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.45V-4 - Procedures for determining lifecycle greenhouse gas emissions rates for qualified clean hydrogen.
§ 1.45V-5 - Procedures for verification of qualified clean hydrogen production and sale or use.
§ 1.45V-6 - Rules for determining the placed in service date for an existing facility that is modified or retrofitted to produce qualified clean hydrogen.
§ 1.45X-0 - Table of contents.
§ 1.45X-1 - General rules applicable to the advanced manufacturing production credit.
§ 1.45X-2 - Sale to unrelated person.
§ 1.45X-3 - Eligible components.
§ 1.45X-4 - Applicable critical minerals.
§ 1.45Y-0 - Table of contents.
§ 1.45Y-1 - Clean electricity production credit.
§ 1.45Y-2 - Qualified facility for purposes of section 45Y.
§ 1.45Y-3 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.45Y-4 - Rules of general application.
§ 1.45Y-5 - Greenhouse gas emissions rates for qualified facilities under section 45Y.
§§ 1.45Z-1-1.45Z-2 - §[Reserved]
§ 1.45Z-3 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.46-1 - Determination of amount.
§ 1.46-2 - Carryback and carryover of unused credit.
§ 1.46-3 - Qualified investment.
§ 1.46-4 - Limitations with respect to certain persons.
§ 1.46-5 - Qualified progress expenditures.
§ 1.46-6 - Limitation in case of certain regulated companies.
§ 1.46-7 - Statutory provisions; plan requirements for taxpayers electing additional investment credit, etc.
§ 1.46-8 - Requirements for taxpayers electing additional one-percent investment credit (TRASOP's).
§ 1.46-9 - Requirements for taxpayers electing an extra one-half percent additional investment credit.
§ 1.46-10 - [Reserved]
§ 1.47-1 - Recomputation of credit allowed by section 38.
§ 1.47-2 - “Disposition” and “cessation”.
§ 1.47-3 - Exceptions to the application of § 1.47-1.
§ 1.47-4 - Electing small business corporation.
§ 1.47-5 - Estates and trusts.
§ 1.47-6 - Partnerships.
§ 1.47-7 - Rehabilitation credit allocated over a 5-year period.
§ 1.48-1 - Definition of section 38 property.
§ 1.48-2 - New section 38 property.
§ 1.48-3 - Used section 38 property.
§ 1.48-4 - Election of lessor of new section 38 property to treat lessee as purchaser.
§ 1.48-5 - Electing small business corporations.
§ 1.48-6 - Estates and trusts.
§ 1.48-9 - Definition of energy property.
§ 1.48-10 - Single purpose agricultural or horticultural structures.
§ 1.48-11 - Qualified rehabilitated building; expenditures incurred before January 1, 1982.
§ 1.48-12 - Qualified rehabilitated building; expenditures incurred after December 31, 1981.
§ 1.48-13 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.48-14 - Rules applicable to energy property.
§ 1.48-15 - Election to treat clean hydrogen production facility as energy property.
§§ 1.48C-1-1.48C-2 - §[Reserved]
§ 1.48C-3 - Rules relating to the increased credit amount for prevailing wage and apprenticeship.
§ 1.48D-0 - Table of contents.
§ 1.48D-1 - Advanced manufacturing investment credit determined.
§ 1.48D-2 - Definitions.
§ 1.48D-3 - Qualified property.
§ 1.48D-4 - Advanced manufacturing facility of an eligible taxpayer.
§ 1.48D-5 - Beginning of construction.
§ 1.48D-6 - Elective payment election.
§ 1.48(e)-0 - Table of contents.
§ 1.48(e)-1 - Low-Income Communities Bonus Credit Program.
§ 1.48E-0 - Table of contents.
§ 1.48E-1 - Clean electricity investment credit.
§ 1.48E-2 - Qualified investments in qualified facilities and EST for purposes of section 48E.
§ 1.48E-3 - Rules relating to the increased credit for prevailing wage and apprenticeship.
§ 1.48E-4 - Rules of general application.
§ 1.48E-5 - Greenhouse gas emissions rates for qualified facilities under section 48E.
§ 1.48E(h)-0 - Table of contents.
§ 1.48E(h)-1 - Clean Electricity Low-Income Communities Bonus Credit Amount Program.
§ 1.50-0 - Table of contents.
§ 1.50-1 - Lessee's income inclusion following election of lessor of investment credit property to treat lessee as acquirer.
§ 1.50-2 - Recapture of the advanced manufacturing investment credit in the case of certain expansions.

RULES FOR COMPUTING CREDIT FOR EXPENSES OF WORK INCENTIVE PROGRAMS
§ 1.50A-1 - Determination of amount.
§ 1.50A-2 - Carryback and carryover of unused credit.
§ 1.50A-3 - Recomputation of credit allowed by section 40.
§ 1.50A-4 - Exceptions to the application of § 1.50A-3.
§ 1.50A-5 - Electing small business corporations.
§ 1.50A-6 - Estates and trusts.
§ 1.50A-7 - Partnerships.
§ 1.50B-1 - Definitions of WIN expenses and WIN employees.
§ 1.50B-2 - Electing small business corporations.
§ 1.50B-3 - Estates and trusts.
§ 1.50B-4 - Partnerships.
§ 1.50B-5 - Limitations with respect to certain persons.
§ 1.51-1 - Amount of credit.

TAX SURCHARGE
§ 1.52-1 - Trades or businesses that are under common control.
§ 1.52-2 - Adjustments for acquisitions and dispositions.
§ 1.52-3 - Limitations with respect to certain persons.
§ 1.53-1 - Limitation based on amount of tax.
§ 1.53-2 - Carryback and carryover of unused credit.
§ 1.53-3 - Separate rule for pass-through of jobs credit.
§ 1.55-1 - Alternative minimum taxable income.
§ 1.56-0 - Table of contents to adjustment for book income of corporations.

REGULATIONS APPLICABLE TO TAXABLE YEARS BEGINNING IN 1969 AND ENDING IN 1970
§ 1.56(g)-0 - Table of Contents.
§ 1.56(g)-1 - Adjusted current earnings.

TAX PREFERENCE REGULATIONS
§ 1.57-0 - Scope.
§ 1.57-1 - Items of tax preference defined.
§§ 1.57-2—1.57-3 - §[Reserved]
§ 1.57-4 - Limitation on amounts treated as items of tax preference for taxable years beginning before January 1, 1976.
§ 1.57-5 - Records to be kept.
§ 1.58-1 - [Reserved]
§ 1.58-2 - General rules for conduit entities; partnerships and partners.
§ 1.58-3 - Estates and trusts.
§ 1.58-3T - Treatment of non-alternative tax itemized deductions by trusts and estates and their beneficiaries in taxable years beginning after December 31, 1982 (temporary).
§ 1.58-4 - Electing small business corporations.
§ 1.58-5 - Common trust funds.
§ 1.58-6 - Regulated investment companies; real estate investment trusts.
§ 1.58-7 - Tax preferences attributable to foreign sources; preferences other than capital gains and stock options.
§ 1.58-8 - Capital gains and stock options.
§ 1.59-1 - Optional 10-year writeoff of certain tax preferences.
§ 1.59A-0 - Table of contents.
§ 1.59A-1 - Base erosion and anti-abuse tax.
§ 1.59A-2 - Applicable taxpayer.
§ 1.59A-3 - Base erosion payments and base erosion tax benefits.
§ 1.59A-4 - Modified taxable income.
§ 1.59A-5 - Base erosion minimum tax amount.
§ 1.59A-6 - Qualified derivative payment.
§ 1.59A-7 - Application of base erosion and anti-abuse tax to partnerships.
§ 1.59A-8 - [Reserved]
§ 1.59A-9 - Anti-abuse and recharacterization rules.
§ 1.59A-10 - Applicability date.
§ 1.60 - [Reserved]
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