The current tax year is 2024, and tax returns for 2024 income are due April 15, 2025

A tax year is the 12-month period the IRS uses to measure your income and calculate what you owe. For most people, the tax year runs from January 1 through December 31 of the same calendar year. So the 2024 tax year covers income you earned from January 1, 2024, through December 31, 2024. You report that income on a tax return filed in 2025.

The confusion happens because the year you file is different from the year you're reporting on. You file your 2024 return in early 2025. The IRS important date is April 15, 2025, though you can file earlier if your return is ready.

Some self-employed people and certain businesses use a different period called a fiscal year, which can run from any date to any date — for example, July 1 to June 30. But if you're an employee receiving a W-2, you use the calendar tax year.

Key Takeaways

  • The tax year 2024 covers income earned from January 1 through December 31, 2024, and you file that return in 2025.
  • Most individual taxpayers use the calendar year (January to December) as their tax year, not a fiscal year.
  • The tax return important date for 2024 income is April 15, 2025, unless you request an extension or live in a state with a different important date.
  • Your W-2 forms and 1099 forms will show 2024 as the tax year, matching the income period they report.

Why the tax year matters when you file

The tax year tells you which income to include on your return and which forms to use. When you file in 2025, you're reporting 2024 income — not 2025 income, even though you're filing in 2025. This is why your employer sends you a 2024 W-2 in January 2025: it covers wages you earned in 2024.

If you earned money in late December 2024, it goes on your 2024 return. If you earned money in early January 2025, it goes on your 2025 return, which you'll file in 2026. The calendar date of when you actually receive the money doesn't matter — what matters is when you earned it.

This also affects which tax forms and tax brackets explore to you. The IRS updates tax brackets, standard deductions, and form instructions each year. The 2024 forms and brackets are used only for 2024 income.

How to find out which tax year forms you need

The tax year is printed on every IRS form. Look at the top right corner of your 1040, 1099, W-2, or Schedule C — you'll see a box labeled "Tax year" with the year printed in it. When you read forms from IRS.gov, the year is in the filename and on the form itself.

If you're using tax software, the program asks you which tax year you're filing for when you start. It then loads the correct forms and instructions automatically. If you're filing by mail, make sure you're using the forms for the year you're reporting on, not the year you're filing in.

The IRS releases forms for the new tax year in late fall or early winter of the previous year. So 2025 forms become available in November or December 2024. If you file early, you might need to wait for the new forms to be released.

What happens if you file for the wrong tax year

If you file a 2023 return when you meant to file a 2024 return, the IRS will likely reject it or process it incorrectly. Your employer's records won't match — they'll have reported your 2024 wages to the IRS on a 2024 W-2, but your return will show 2023 income.

If this happens, you can file an amended return using Form 1040-X for the correct year. The process takes longer and may delay any refund you're owed. It's easier to check the tax year on your forms before you file.

Tax years for self-employed people and businesses

If you're self-employed or own a business, you can choose to use a calendar year (January through December) or a fiscal year (any 12-month period). Most sole proprietors use the calendar year because it's simpler and matches their personal tax year.

If you choose a fiscal year, you report it to the IRS on Form 8716 and use that same fiscal year every year unless you get permission to change it. A fiscal year might run from April 1 to March 31, for example. You'd still file your return by the important date for that fiscal year — usually the 15th day of the fourth month after your fiscal year ends.

How tax years work with extensions and late filing

If you file for an extension, you're still filing for the same tax year — just later than April 15. An extension for 2024 taxes gives you until October 15, 2025, to file your 2024 return. The tax year doesn't change; only the important date does.

If you file late without an extension, you're still filing for the tax year the income was earned in. The IRS will charge penalties and interest, but the tax year itself doesn't shift. You can't file a 2024 return in 2026 and call it a 2025 return to avoid penalties.

Frequently Asked Questions

Is the tax year the same as the calendar year?

For most people, yes. The tax year runs January 1 through December 31, which is the calendar year. Self-employed people and some businesses can choose a different 12-month period called a fiscal year, but they must report it to the IRS and use it consistently.

When do I file my 2024 tax return?

Tax returns for 2024 income are due April 15, 2025. You can file earlier if your forms are ready. If you need more time, you can request an extension by October 15, 2025, though you still owe any taxes due by April 15.

Why do I get a 2024 W-2 in January 2025?

Your employer sends you a 2024 W-2 in January 2025 because it reports wages you earned during the 2024 tax year (January 1 through December 31, 2024). You use this form to file your 2024 return in 2025. The form is dated for the year the income was earned, not the year you receive it.

Can I file my 2025 return before 2025 ends?

No. You can only file a tax return after the tax year has ended. You can file your 2024 return starting in January 2025, but you cannot file your 2025 return until January 2026. Filing early means filing as soon as the year ends and your forms are ready, not before the year is over.

What if I earned money in December 2024 but didn't receive it until January 2025?

It depends on your accounting method. If you use the cash method (most individuals do), you report income when you receive it. If you use the accrual method (common for businesses), you report income when you earn it. Check with a tax professional about which method applies to your situation.