You file 2023 taxes in 2024, not 2024 taxes

When you file taxes in 2024, you are reporting income and deductions from 2023 — the calendar year that ended on December 31, 2023. The tax year and the filing year are always one year apart. This is true whether you file in January, April, or October of 2024.

The IRS calls 2023 your tax year. The year you actually file — 2024 — is when you submit your return, but it does not change which year's income you are reporting. Your W-2 forms, 1099 forms, and all other income documents will show 2023 as the tax year.

If you are filing a return in 2024, you will use Form 1040 for tax year 2023. The form itself will say "2023" at the top. Any schedules you attach — Schedule C for self-employment, Schedule A for itemized deductions, or others — will also be marked for tax year 2023.

Key Takeaways

  • Tax year 2023 is reported on returns filed during 2024, regardless of whether you file in January or later in the year.
  • Your W-2, 1099, and other income documents will all show 2023 as the tax year because they report what you earned in 2023.
  • Form 1040 and all attached schedules will be labeled "2023" when you file in 2024.
  • The filing important date for 2023 taxes is April 15, 2024, unless you request an extension.

Why income documents show 2023

Your employer sends you a W-2 for 2023 because it reports wages you earned during the 2023 calendar year — January 1 through December 31, 2023. A client or platform sends you a 1099-NEC or 1099-MISC for 2023 for the same reason: it documents income from 2023. Banks send 1099-INT for interest earned in 2023, and investment firms send 1099-DIV for dividends paid in 2023.

These forms arrive in early 2024 (usually by January 31) so you have the information you need to file your 2023 return. The IRS also receives copies of these forms, which is how they match what you report against what your employer or payer reported.

If you received income in December 2023, it goes on your 2023 return filed in 2024. If you receive income in January 2024, it goes on your 2024 return, which you will file in 2025. The calendar date you receive the money does not matter — only the year it was earned.

What happens if you file late in 2024

Even if you do not file until June, July, or later in 2024, you are still filing your 2023 return. The tax year does not change based on when you submit. You are always one year behind.

If you file after April 15, 2024, you may owe a failure-to-file penalty and interest on any tax you owe, unless you requested an extension before the April 15 important date. An extension gives you until October 15, 2024 to file your 2023 return without penalty, though you still owe any tax due by April 15.

Filing late does not move you forward to the next tax year. You are still reporting 2023 income and deductions, just after the important date.

How the tax year cycle works

The pattern repeats every year. In 2025, you will file your 2024 return. In 2026, you will file your 2025 return. This offset exists because the IRS needs time to receive income documents from employers and payers, and you need time to gather those documents and prepare your return.

If the tax year matched the filing year — if you filed 2024 taxes in 2024 — you would have to file by December 31, 2024, before most W-2s and 1099s even arrived. Instead, the system gives you until the following April (or October with an extension) to file the prior year's return.

This is why tax software and tax forms always ask you which tax year you are filing for. Even though you are using the software in 2024, you select 2023 as the tax year because that is the income you are reporting.

Amended returns and prior years

If you need to correct a 2023 return after you have already filed it, you file Form 1040-X (Amended U.S. Individual Income Tax Return) for tax year 2023. You can file an amended return for 2023 anytime during 2024, 2025, or 2026 — generally within three years of the original filing date.

If you did not file a 2023 return at all, you can still file one in 2024 or later. The IRS does not have a time limit for filing a return if you owe tax, though you will owe penalties and interest for the years you did not file.

Frequently Asked Questions

If I file in January 2024, am I filing 2023 or 2024 taxes?

You are filing 2023 taxes. The year you file does not change the tax year. All returns filed in 2024 — whether in January or October — report income from 2023.

Why does my W-2 say 2023 if I am filing in 2024?

Your W-2 says 2023 because it reports wages you earned during the 2023 calendar year. The tax year on the form always matches the year you earned the income, not the year you file the return.

Can I file my 2024 taxes in 2024?

No. You file 2024 taxes in 2025. In 2024, you file 2023 taxes. The IRS needs time to receive income documents from employers and payers, so filing always happens in the year after the income was earned.

What if I file after April 15, 2024 — does that make it a 2024 return?

No. Filing late does not change the tax year. A return filed in June 2024 is still a 2023 return. Late filing may result in penalties and interest, but the tax year remains 2023.

Do I need to file a separate return for income I earned in early 2024?

No. Income earned in early 2024 goes on your 2024 return, which you will file in 2025. You report only 2023 income on the return you file in 2024.