You mail your tax return to different addresses depending on your country, province/state, and whether you owe a payment or not.

Quick Scoop: Where do I mail my tax return?

1. First question: U.S. or Canada?

The phrase “tax return” plus “T1, T1” in your info suggests you might be talking about a Canadian T1 personal return, but the phrase is also extremely common for U.S. returns. I’ll cover both briefly so you can zero in on what applies to you.

If you’re in the United States

For U.S. federal returns (Form 1040 series), the mailing address depends on:

  • The state or territory where you live
  • Whether you are enclosing a payment or not
  • Whether you are a resident or filing from abroad

How to find the exact IRS address

  1. Look at the “Where to file” section in the instructions for Form 1040, 1040-SR, or 1040-NR.
  2. Or use the IRS “Where to file paper tax returns with or without a payment” page and select your state and form number.
  1. If you are enclosing a check or money order, note there is often a different PO Box than when no payment is enclosed.

Common pattern (example only, not universal):

  • Returns without payment from many states go to processing centers like:
    • “Department of the Treasury, Internal Revenue Service, Ogden, UT 84201-0002” or “Kansas City, MO 64999-0002”.
  • Returns with payment often go to a PO Box in Louisville, KY, Charlotte, NC, or another payment center depending on your state.

Because these addresses change and are state-specific, always confirm the current address on the IRS site or the latest form instructions rather than copying an address from a third-party site.

If you’re mailing from outside the U.S.

  • Many individual filers abroad send Form 1040/1040-NR to an IRS address in Austin, Texas, with or without payment, or to a specific street address when using a private courier.
  • The exact address and any special rules are listed in the Form 1040 or 1040-NR instructions and on the “Where to file” page.

If you’re in Canada (T1 return)

For a Canadian personal T1 paper return, the address depends on:

  • Which province or territory you live in
  • Whether you are a resident, non‑resident, or deemed resident

The Canada Revenue Agency (CRA) groups provinces/territories into a few processing centers, so each region has its own “Where to mail your paper T1 return” entry.

How to get the correct CRA address

  1. Go to CRA’s “Where to mail your paper T1 return” page (linked directly from CRA and many accounting sites).
  1. Choose:
    • Your province/territory of residence on December 31 of the tax year, or
    • Non‑resident/deemed resident options if applicable.
  1. Use that exact address (including any PO Box and postal code) on your envelope.

Tax pros often remind filers that even if you move, you use the address CRA lists for where you lived at year‑end , not necessarily where you live on the day you mail it.

Practical mailing tips (U.S. and Canada)

  • Use the official tax authority website (IRS or CRA) to confirm the address the same day you mail; addresses and PO Boxes can change over time.
  • Use a service with tracking or at least proof of mailing (e.g., certified mail, registered mail, or similar), especially near deadlines.
  • Make sure:
    • Return is signed and dated
    • All slips and schedules are attached
    • You use sufficient postage (returns can be several pages and over 1 oz).

Tiny example

Imagine you live in Ontario and file a paper T1: you would look up “Where to mail your paper T1 return – CRA,” choose Ontario, and use the exact processing center address shown there. If instead you live in Texas and file a Form 1040 with a check enclosed, you would look up “Where to file paper tax returns with or without a payment” on IRS.gov, select Texas and “individual 1040,” and use the payment PO Box listed there.

If you tell me your country and state/province (and whether you’re including a payment), I can help narrow it down to the specific type of address you should be looking for on the official IRS/CRA pages.