It’s getting down to the wire to mail in your tax returns on time.

Your return must be postmarked by April 15, have the correct postage, and be addressed correctly to be considered on time by the IRS, according to the U.S. Postal System.

Make sure to weight your return to get the right postage. Most returns weigh more than one ounce, so you will need more than just a stamp. Your return will be sent back to you if you don’t have enough postage.

Put your return in a USPS blue collection box that has a pick-up time before the deadline. Some post offices will be open longer and offer late postmarking on Tax Day. Call ahead to find out.

There’s no single IRS address. The one you use depends on where you’re filing from and whether your return includes a payment. Here’s where to send yours, according to the IRS.

Alabama, Georgia, Kentucky, New Jersey, North Carolina, South Carolina, Tennessee, and Virginia

With no payment:

Department of the Treasury
Internal Revenue Service
Kansas City, MO 64999-0002

With payment:

Internal Revenue Service
P.O. Box 931000
Louisville, KY 40293-1000

Florida, Louisiana, Mississippi and Texas

With no payment:

Department of the Treasury
Internal Revenue Service
Austin, TX 73301-0002

With payment:

Internal Revenue Service
P.O. Box 1214
Charlotte, NC 28201-1214

Alaska, Arizona, California, Colorado, Hawaii, Idaho, New Mexico, Nevada, Oregon, Utah, Washington, and Wyoming

With no payment:

Department of the Treasury
Internal Revenue Service
Fresno, CA 93888-0002

With payment:

Internal Revenue Service
P.O. Box 7704
San Francisco, CA
94120-7704

Arkansas, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Montana, Nebraska, North Dakota, Ohio, Oklahoma, South Dakota, and Wisconsin

With no payment:

Department of the Treasury
Internal Revenue Service
Fresno, CA 93888-0002

With payment:

Internal Revenue Service
P.O. Box 802501
Cincinnati, OH 45280-2501

Delaware, Maine, Massachusetts, Missouri, New Hampshire, New York, and Vermont

With no payment:

Department of the Treasury
Internal Revenue Service
Kansas City, MO 64999-0002

With payment:

Internal Revenue Service
P.O. Box 37008
Hartford, CT 06176-7008

Connecticut, District of Columbia, Maryland, Pennsylvania, Rhode Island, and West Virginia

With no payment:

Department of the Treasury
Internal Revenue Service
Ogden, UT 84201-0002

With payment:

Internal Revenue Service
P.O. Box 37910
Hartford, CT 06176-7910

This article originally appeared on USA TODAY: Where and how to mail your federal tax return