How to Fix a Mistake on a Money Order: Cancel, Refund, Timeline

If you wrote the wrong name, the wrong amount, or made another mistake on a money order, do not cross it out, white it out, or write over it. Any visible correction makes the money order look altered, and a bank teller will refuse to cash it. The way to fix a mistake on a money order is to cancel the original through the issuer, pay a processing fee, and either take the refund or use it to buy a new one.

Fees run roughly $5 to $21 depending on who issued the money order and how much it was worth. That is almost always cheaper than the trouble of having a payment bounce back.

Why You Cannot Just Write Over the Mistake

Under the Uniform Commercial Code, a fraudulent alteration to a negotiable instrument discharges the obligation of the party whose terms were changed.¹ In plain terms: once a money order looks tampered with, it stops being negotiable. Tellers are trained to reject them. Your correction may be completely innocent, but the document is finished the moment it looks changed.

So the fix is procedural, not cosmetic. You cancel the flawed money order, get your money back (minus a fee), and start over.

Which Mistakes Actually Require Cancellation

Not every field carries the same weight.

Wrong payee name. Banks match the name on the money order to the recipient’s ID. Even a misspelling can get it rejected, so a replacement is almost always needed.
Wrong dollar amount. The printed amount cannot be changed. Cancel and reissue.
Wrong purchaser name or address (your own info). Less critical, since this field is mostly for the issuer’s records. But if you later need to file a claim, incorrect info on your end can slow things down.

When it is a close call, cancel and buy a new one. A few dollars now beats a rejected payment later.

What to Gather Before You Request a Refund

Before you contact the issuer, pull together:

The original purchase receipt or detachable stub, which has the serial number, amount, and date.
The uncashed money order itself, if you still have it. Some issuers process refunds faster when they can verify the physical document.
A separate check or money order to cover the processing fee. Some issuers deduct the fee from your refund instead.

USPS domestic money orders carry a 10-digit serial number printed on both the money order and the receipt.² Copy it carefully. One transposed digit will delay your claim. Western Union and MoneyGram serial numbers look different but appear in the same two places.

How to Cancel a Money Order by Issuer

USPS

USPS money orders can be worth up to $1,000 each.³ To cancel one, complete PS Form 6401, “Money Order Inquiry.”⁴ Fill out Section A in black ink with the serial number, dollar amount, and issue date from your receipt. Use a separate form for each money order.

Submit it at any post office or mail it to the address on the form. The inquiry fee is $21.00 as of January 2026.⁵ Cash is not accepted for mailed submissions; pay with a separate check or money order. USPS issues the refund 60 days or later from the original issue date of the money order, or sends you a photocopy of the cashed money order if someone already redeemed it.⁴ Check status by calling 1-866-974-2733.

Western Union

Western Union takes refund requests online through its Money Order Refund Request page. The form first lets you verify whether the money order has already been cashed. If it has, you cannot get a refund.⁶ You upload proof of purchase, such as a photo of the receipt showing the barcode or a copy of the money order.

The processing fee depends on the face value:⁶

$5 or less: no fee
$5.01 to $99.99: $5
$100 or more: $15

The fee is deducted from the refund. Western Union states it processes approved refunds within five business days. You collect the refund at any Western Union agent with a valid government-issued ID.

MoneyGram

MoneyGram uses a Money Order Claim Card attached to the receipt jacket you got at purchase. Complete it and mail it, along with a copy of your detachable receipt and an $18 processing fee (check or money order payable to MoneyGram International), to:

MoneyGram Payment Systems, Inc.
PO Box 610
Minneapolis, MN 55480-0610

Claims typically process within 15 days of receipt.

If you bought a MoneyGram money order at a retailer such as Walmart, you may be able to get a cash refund at the store within 180 days of purchase, as long as you have the original receipt and the money order has not been cashed or deposited.

If You Lost the Receipt

Losing the receipt slows things down but does not shut you out.

USPS: You can still file PS Form 6401 without the receipt. Provide as much detail as you can: approximate purchase date, dollar amount, and the post office where you bought it. Expect a longer wait while USPS searches records.
Western Union: Submit the Money Order Research Request form with a $15 non-refundable administrative fee. The online refund form also accepts other proof of purchase, such as a store receipt paired with a police report that references the money order number. If you cannot supply adequate proof, Western Union will search and notify you of the results in two to four weeks.⁷⁶
MoneyGram: Use the Money Order Number Lookup form on MoneyGram’s service forms page to search for your transaction. Once you have the number, file the standard claim.⁸

Any documentation helps: a bank or card statement showing the purchase, a store receipt, or even the location and approximate date.

How Long the Refund Takes

USPS: 60 days or later from the money order’s original issue date, mailed to the address on the form.⁴
Western Union: Approved refunds within five business days, picked up in person at an agent.⁶
MoneyGram: Generally within 15 days of receipt.

If you mail your paperwork, use certified mail. A tracking number and delivery confirmation protect you if the issuer says nothing arrived.

If the Money Order Has Already Been Cashed

If you delayed and the recipient (or someone else) already cashed the money order, no refund is available. The issuer will instead send you a photocopy of the cashed money order showing the endorsement, so you can see who signed for the funds.

If the signature looks forged, or nobody was authorized to cash it, you have options beyond a refund. For USPS money orders, you can file PS Form 8165, the Mail Fraud Report, with the U.S. Postal Inspection Service, attaching copies (not originals) of receipts, correspondence, and the photocopy of the cashed money order.⁹ For Western Union or MoneyGram, contact the issuer’s fraud department directly; MoneyGram’s fraud line is (800) 926-9400. A police report creates an official record if the matter goes further.

1
Cornell Law Institute. Uniform Commercial Code 3-407 – Alteration
2
USPS. Missing, Lost, or Stolen U.S. Money Order Forms
3
USPS. Sending Money Orders
4
USPS. PS Form 6401 – Money Order Inquiry
5
Postal Explorer. Notice 123 – Price List
6
Western Union. Money Order Refund Request
7
Western Union Financial Services, Inc. Money Order Research Request
8
MoneyGram. MoneyGram Service Forms
9
U.S. Postal Inspection Service. PS Form 8165 – Mail Fraud Report