Mail your Form 945 to the IRS address that matches your state, even when there's no payment enclosed

Form 945 is the annual tax return for federal income tax withheld from non-payroll payments — things like gambling winnings, retirement distributions, or other miscellaneous income. When you file it without a payment, the IRS still needs to receive it by the important date, and it goes to a specific mailing address based on where you live.

The address you use depends on your state. The IRS maintains separate processing centers for different regions, and sending Form 945 to the wrong address delays processing. You do not need to include a payment coupon or stub when there is no money attached — just the completed form itself.

Key Takeaways

  • Form 945 without payment goes to an IRS address determined by your state of residence, not your business location.
  • The IRS publishes the correct mailing address in the Form 945 instructions each year, and addresses can change.
  • You should mail the form by the filing important date (usually April 15 for the prior calendar year) to avoid penalties.
  • If you are unsure which address applies to your state, the Form 945 instruction booklet contains a complete state-by-state mailing list.

How to find the correct mailing address for your state

The IRS publishes Form 945 instructions every year, and those instructions include a table listing the mailing address for each state. You can read the current year's Form 945 instructions from IRS.gov, or request them by phone at 1-800-829-3676.

The addresses are organized by state and are different from the addresses used for other tax forms. Using the wrong address means your form may be routed to the wrong processing center, which can delay your return and any refund you are owed. The instructions are free and updated annually, so always check the current year's version before mailing.

What to include when mailing without payment

When you mail Form 945 without a payment, include only the completed form itself. Do not include a payment coupon, a check, or any payment stub. The form should be signed and dated, and you should keep a copy for your records.

If you are mailing multiple forms or documents together, make sure Form 945 is clearly labeled and separate from any other tax paperwork. Use a standard business envelope and send it via regular mail or a trackable method like certified mail if you want proof of delivery.

Mailing important date and what happens if you miss them

Form 945 is due by April 15 of the year following the tax year it covers. For example, a Form 945 for the 2023 tax year is due April 15, 2024. If you mail it after that date, you may owe a failure-to-file penalty, even if no payment is due.

The IRS considers a return filed on the date it is postmarked, not the date it arrives. Mail your form early enough that it reaches the IRS before the important date. If the important date falls on a weekend or holiday, the important date moves to the next business day.

When to use certified mail or tracking

Regular first-class mail is acceptable for Form 945, but sending it via certified mail with return receipt gives you proof that the IRS received it. This is helpful if there is ever a question about whether you filed on time. Certified mail costs a few dollars more but provides documentation.

You can also file Form 945 electronically through an accountant or tax software, which provides when ready confirmation of receipt. Electronic filing is faster and eliminates mailing delays, though it is not required.

What to do if you need to file late or amend a prior year

If you missed the important date for a prior year's Form 945, you can still file it. Send it to the same state-based address with a written explanation of why it is late. The IRS will process it, though you may owe penalties and interest on any tax owed.

If you need to correct a Form 945 you already filed, use Form 945-X (Amended Annual Return of Withheld Federal Income Tax or Adjustment of Estimated Tax for Individuals). Form 945-X also goes to the same state-based mailing address. Include a brief explanation of what you are correcting.

Frequently Asked Questions

Can I mail Form 945 to the same address I use for my 1040?

No. Form 945 has its own mailing addresses that differ from personal income tax returns. Always use the address listed in the Form 945 instructions for your state. Using the 1040 address will delay processing.

What if I file Form 945 but later realize I made a mistake?

File Form 945-X to correct it. Send it to the same state-based address you used for the original Form 945. Keep copies of both the original and the amended form for your records.

Do I need to include a cover letter when mailing Form 945?

A cover letter is not required, but you can include one if you want to explain anything about your return. Keep it brief and make sure your name, tax identification number, and the tax year are clearly visible on the form itself.

Is it better to mail Form 945 or file it electronically?

Electronic filing is faster and gives you when ready confirmation of receipt. If you have access to tax software or an accountant, electronic filing eliminates mailing delays and the risk of the form getting lost in transit.