You file 2024 taxes in 2025, not 2025 taxes

When you file your taxes in 2025, you are reporting income and deductions from 2024 — the calendar year that just ended. The tax year always runs January 1 through December 31, and you file the return for that year in the following year. So in April 2025, you will file your 2024 tax return with the IRS.

This can feel backwards if you are new to tax filing. The year on your return is not the year you are sitting in when you file it. Your 2024 return covers all the money you earned, spent, and paid in taxes during 2024. You gather those documents and file the return between January and April 2025.

Key Takeaways

  • The 2024 tax year covers January 1 through December 31, 2024, and you file that return in 2025.
  • Tax returns are always filed in the year after the income was earned, so 2025 filing is for 2024 income.
  • The IRS important date to file your 2024 return is April 15, 2025, unless you request an extension.
  • Your W-2 forms, 1099 forms, and other income documents will show 2024 as the tax year they cover.

Why the tax year is always one year behind

The IRS needs time to receive all your income documents from employers, banks, and other sources. Your employer sends you a W-2 form by January 31, and banks send 1099 forms by the same date. The IRS also receives copies of these forms, so they can cross-check your return against what employers and financial institutions reported.

Because documents arrive in January and February, the filing season does not open until late January. The IRS then gives you until April 15 to file your return. This timing — documents in January, filing important date in April — is why you always file last year's taxes this year.

What documents show the tax year

Every income document you receive will clearly state which tax year it covers. Your W-2 form from your employer will show "2024" in the top right corner. A 1099-INT form from your bank showing interest income will also say "2024." If you received unemployment benefits, your 1099-G will say "2024."

When you gather documents to file, check the year printed on each one. If a form says 2024, it belongs in your 2024 tax return. Do not mix documents from different years. If you are self-employed and received a 1099-NEC or 1099-MISC, those will also show 2024 if they cover work you did in 2024.

The 2024 tax year filing important date

The important date to file your 2024 tax return is April 15, 2025. This date is set by federal law and does not change unless Congress passes new legislation. If April 15 falls on a weekend or holiday, the important date moves to the next business day, but this is rare.

If you cannot file by April 15, you can request an extension from the IRS. An extension gives you until October 15, 2025, to file your 2024 return. However, an extension to file is not an extension to pay — if you owe taxes, they are due on April 15 even if you file late. You can pay what you estimate you owe by April 15 and then file the actual return later.

How to know which year goes on your return

The simplest rule: the year you are filing in minus one is the tax year on your return. If you are filing in January, February, March, or April 2025, you are filing a 2024 return. If you are filing in May or later in 2025, you are filing late, but it is still a 2024 return.

Your tax software or the IRS forms themselves will tell you which year to use. When you open tax software in 2025, it will ask you to select the 2024 tax year. The form you read from the IRS website will be labeled "Form 1040 for Tax Year 2024." You do not have to guess — the year is printed on everything.

What happens if you file the wrong tax year

If you accidentally file a 2025 return when you meant to file 2024, the IRS will likely reject it or send it back. Tax software usually prevents this by locking you into the current tax year, so it is hard to make this mistake. If you do file the wrong year, contact the IRS or your tax preparer to file an amended return for the correct year.

Filing late — after April 15 — means you may owe penalties and interest on any taxes you owe, even if you filed an extension request. The extension itself does not waive penalties; it only gives you more time to file without the return being considered late. If you expect to owe money, paying by April 15 protects you from interest charges on the unpaid balance.

Frequently Asked Questions

Am I filing 2024 or 2025 taxes right now?

If you are filing between January and April 2025, you are filing your 2024 taxes. The tax year on your return is always the year before the calendar year you are in. Check your W-2 or 1099 forms — they will say 2024 if they are for the income you earned in 2024.

What if I did not receive all my documents by January 31?

Contact the employer or financial institution that owes you the form. By law, W-2 and 1099 forms must be sent by January 31. If you do not receive one by mid-February, call the source directly. You can also file your return without a missing form and amend it later once the form arrives, though this may delay your refund.

Can I file my 2025 taxes early in 2025?

No. You cannot file 2025 taxes until 2026, because 2025 has not ended yet. In 2025, you can only file your 2024 return. The IRS will not accept a 2025 return until the 2025 tax year is complete on December 31, 2025, and filing season for 2025 returns opens in January 2026.

Do I need to file by April 15 if I am getting a refund?

No legal important date forces you to file if you are owed a refund, but filing sooner means you get your money sooner. The IRS does not owe you interest on a refund, so there is no financial penalty for filing late. However, if you wait too long — generally three years — you may lose the right to claim that refund.

What if my tax year spans two calendar years?

If you are self-employed, you may use a fiscal year instead of a calendar year for taxes. A fiscal year can run from any date to any date, such as July 1 to June 30. Your tax return would then cover that period, not January to December. Consult a tax preparer if you use a fiscal year, as the filing rules are different.