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Where to mail your Louisiana state tax return

Mailing your Louisiana Form IT-540 depends on your situation: Return with payment goes to Louisiana Department of Revenue, PO Box 3550, Baton Rouge, LA 70821-3550, while Return without payment (refund expected) goes to Louisiana Department of Revenue, PO Box 3440, Baton Rouge, LA 70821-3440. Pick the address that matches your return below, sign and date the form, and mail it before the deadline.

Return with payment

Louisiana Department of Revenue
PO Box 3550
Baton Rouge, LA  70821-3550

Use this address for a paper Form IT-540 where return with payment.

Verified September 2026revenue.louisiana.gov

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Mail my Louisiana tax return — $5

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  • You write & pay
  • We print & envelope
  • USPS, next business day
  • Confirmation of Mailing emailed

Other mailing addresses

Return without payment (refund expected)

Louisiana Department of Revenue
PO Box 3440
Baton Rouge, LA  70821-3440

Use this address for a paper Form IT-540 where return without payment (refund expected).

Your name
Your return address

Louisiana Department of RevenuePO Box 3550Baton Rouge, LA 70821-3550

Your letter, printed and mailed for you.

Key facts

  • Louisiana splits paper Form IT-540 returns by address: return with payment vs. return without payment (refund expected) — mailing to the wrong one can delay processing.
  • Make checks or money orders payable to the "Louisiana Department of Revenue".
  • A mailed return is generally considered filed on time if it is postmarked by the state filing deadline — sign and date it, since an unsigned return isn't considered filed.
  • PostPal prints your return and hands it to USPS the next business day for $5 — no printer, envelope, or trip to the post office.

How to send your letter

  1. 1

    Pick the address that matches your situation

    Louisiana uses a different address depending on whether you're enclosing a payment: Return with payment; Return without payment (refund expected). Choose the one below that matches your return.

  2. 2

    Assemble and sign your return

    Attach any required schedules and withholding statements to your Form IT-540. Sign and date it — an unsigned paper return isn't considered filed.

  3. 3

    Address the envelope exactly

    Use Louisiana Department of Revenue at the address for your situation, shown above.

  4. 4

    Mail it before the deadline

    A USPS postmark by the filing deadline counts as on time. Upload your return to PostPal and we print, envelope, and mail it within one business day for $5, with a dated confirmation emailed to you.

Common questions

Where do I mail my Louisiana state tax return?

It depends on whether you're enclosing a payment. For "return with payment," mail it to Louisiana Department of Revenue, PO Box 3550, Baton Rouge, LA 70821-3550. For "return without payment (refund expected)," mail it to Louisiana Department of Revenue, PO Box 3440, Baton Rouge, LA 70821-3440.

Does it matter which Louisiana address I use?

Yes. Louisiana Department of Revenue routes paper returns by mail code, so sending a payment return to the no-payment address (or vice versa) can delay processing, even though the state and ZIP still get it to the right building.

What do I make my check payable to?

The "Louisiana Department of Revenue". Write your Social Security number and the tax year on the check or money order.

Is a mailed Louisiana return considered on time if it's postmarked by the deadline?

Generally yes — most states, including Louisiana, treat a return as timely filed if it carries a USPS postmark on or before the filing deadline. Keep proof of mailing for your records; PostPal emails you a dated confirmation.

Can PostPal mail my Louisiana tax return for me?

Yes. Upload your completed, signed Form IT-540 and PostPal prints it and mails it to Louisiana Department of Revenue, PO Box 3550, Baton Rouge, LA 70821-3550 (or your correct address, based on your situation) the next business day for $5, with a dated Confirmation of Mailing.

Sources

Addresses verified September 2026 against official sources. Always confirm on the official site before time-sensitive filings.

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