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2025 Tax Return Changes: A CPA Guide to This Season | HelloBooks What is new on 2025 returns filed in 2026: Schedule 1-A, the higher SALT cap, revised forms and business write-offs, one preparer page each, with IRS sources.

Tax year 2025 · filed in 2026

What changed on 2025 tax returns

The 2025 return is the first one shaped by the July 2025 federal law. This page gathers every change that lands on a 2025 return, grouped the way your reviewers work: the new lines on Form 1040, the revised schedules, and the business items that affect what a client owes for 2025.

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Tax year 2025

Standard deduction, married filing jointly

$31,500

Senior deduction per eligible person
$6,000
Child tax credit per child
$2,200
Section 179 limit
$2,500,000

Applies: Returns for tax year 2025From IRS.gov · checked October 10, 2026

The filing calendar for 2025 returns

Federal due dates that fall in calendar 2026, from IRS Publication 509. Weekend dates have already been rolled forward.

Due dateWhat is due
February 2, 2026W-2s to employees (January 31 fell on a Saturday)
March 16, 2026Partnership (1065) and S corporation (1120-S) returns and K-1s (March 15 fell on a Sunday)
April 15, 2026Individual (1040) and calendar-year C corporation (1120) returns; first 2026 estimated payment
June 15, 2026Second 2026 estimated payment
September 15, 2026Extended 1065 and 1120-S returns; third 2026 estimated payment
October 15, 2026Extended 1040 and 1120 returns
December 15, 2026Fourth 2026 estimated payment for calendar-year corporations
January 15, 2027Fourth 2026 estimated payment for individuals

From IRS.gov, checked October 10, 2026.

The pages in this section

40 pages, grouped for review.

New lines and limits on the 2025 Form 1040

Revised 2025 forms and schedules

Business and timing items that affect 2025

Review points for 2025 files

Most first-year errors on these returns will come from items a client did not know to mention, so the review checklist matters more than usual.

  • Confirm every Schedule 1-A amount has a document behind it: a pay stub split, a loan statement with the VIN, or a birth date for the senior amount.
  • Check the SALT worksheet on any return with modified AGI near the phase-down, rather than entering the cap by habit.
  • For vehicles and home energy work, look at the contract or spending date before allowing a credit, because several credits stopped partway through the year.
  • On business returns, confirm the acquisition date of each asset so the right bonus percentage is used.

Amended returns and late guidance

Several state conformity bills passed after the filing season had opened, some of them retroactive to 2025. Keep a list of returns filed before each late change, and decide case by case whether an amendment is worth the client’s fee.

FAQ

Frequently asked questions

Does this hub cover state returns for 2025?
No. State changes have their own hub at /cpa/tax-return-changes/states, because each state chose differently whether to follow the 2025 federal law.
Which 2025 changes apply retroactively to the whole year?
The Schedule 1-A deductions, the higher standard deduction and the $2,200 child tax credit all apply to the full 2025 year, even though the law was signed in July. Each page states the effective date the IRS gives.

Sources

General information for tax professionals, not advice on a specific return. Check the current official instructions before filing.

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