Remittance Envelopes for Nonprofits: Sizing, Stock and the Year-End Mail Calendar

A remittance envelope is the small reply envelope that goes inside an appeal letter or a statement, so the person reading it already has something to put a check in. It is the least glamorous piece in a fundraising package and the one that most often decides whether a gift gets mailed at all: a donor who has to find their own envelope usually finds something else to do instead.

The two sizes, and how to pick

Two formats cover nearly every nonprofit mailing. The 6 3/4 remittance envelope is 3 5/8 by 6 1/2 inches and is the standard reply envelope — it fits inside a #10 business envelope without folding. The #9 remittance envelope is 3 7/8 by 8 7/8 inches, slightly larger, and is the one to use when the reply card is bigger or when you want the donor to return the letter itself along with the check.

The rule is simple: the reply envelope has to fit inside the outer envelope with a little room, and the reply card has to fit inside the reply envelope without being forced. If you are mailing in a #10, use the 6 3/4. If you are mailing in a booklet or a 6x9, the #9 gives you more room to work with.

Why the stock matters more than it sounds

Remittance envelopes print on 24# white uncoated text. Uncoated is not a cost decision — it is the whole point. A donor is going to write on this envelope: an account number, an amount, sometimes a note. Ballpoint and gel ink sit on a coated sheet and smear when a thumb crosses them. On uncoated stock the ink soaks in and stays legible.

The same logic applies to the outer envelope. If you are printing that too, uncoated or linen stock keeps a handwritten address readable, and a handwritten address is still one of the few things that reliably gets an envelope opened.

Print in color, or don't

Remittance envelopes run full color or black and white. Black and white is cheaper and, for a reply envelope that lives inside a letter for four seconds before being used, often the right call. Spend the color budget on the outer envelope, which is the piece that has to survive the walk from the mailbox to the kitchen table.

Where color does earn its place on a remittance envelope: a mission photo, a gift-level checkbox grid, or a legally required disclosure that you want people to actually read.

The 2026 year-end calendar, worked backwards

Year-end giving in the United States clusters around two dates. Giving Tuesday falls on 1 December 2026, the Tuesday after Thanksgiving on 26 November. The second cluster is the last week of December, when donors are closing out the tax year.

Work backwards from the date you want the letter in a mailbox, not from the date you want to send it. A realistic sequence for a Giving Tuesday mailing: letters land 24-27 November, which means they go to the post office around 18-20 November, which means the printed envelopes and inserts have to be in your hands by roughly 13 November, which means the print order is placed in the first week of November. Standard turnaround here is 3-5 business days, with a three business day option when the mail date will not move, but postal transit and the mail house are the parts that expand without warning.

For a late-December mailing, add a week to everything. The postal system in the second half of December is slower than the rest of the year, and a letter that arrives on 2 January is a letter that arrives in the wrong tax year.

Order the envelopes with the letter, not after it

The common failure is ordering the outer envelope and the letter first and treating the reply envelope as an afterthought. By the time someone remembers it, the insert dimensions are fixed and the only reply envelope that fits is one nobody stocks. Decide the package as a set: outer envelope, letter, reply card, reply envelope — checked against each other before anything prints.

Angels Print prints all four in the same shop and ships anywhere in the U.S. If you send the insert dimensions we will confirm what fits before the run, and a mailing list can be addressed in the same pass instead of as a second job.