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

If you wrote the wrong name, the wrong amount, or another error on a money order, you cannot fix it on the document itself. Crossing out, writing over, or using correction fluid will make the money order look altered, and banks will refuse to cash it. The way to fix a mistake on a money order is to cancel it with the issuer, pay a processing fee, and either take the refund or use it to buy a new one.

Why You Cannot Just Cross It Out

Any visible change to a money order signals possible tampering. Under the Uniform Commercial Code, a fraudulent alteration to a negotiable instrument discharges the obligation of the party whose terms were changed.¹ In practice, a teller who sees overwriting or white-out will decline to cash it, even when the correction was innocent. Once it looks altered, it is no longer negotiable.

That leaves one reliable path: cancel the original, get your money back from the issuer, and start over with a clean money order.

Which Mistakes Actually Need a New Money Order

Not every field matters equally.

Wrong payee name. Banks match the name on the money order against the recipient’s photo ID, so even a misspelling can get it rejected. You almost always need a new one.
Incorrect dollar amount. The printed amount cannot be changed. Cancel and reissue.
Your own name or address in the purchaser field. This is less likely to stop the recipient from cashing it, since that information is mainly for the issuer’s records. But if you later need to file a claim, a wrong address on your side can slow the correspondence.

When you are not sure, cancel. A few dollars in fees is cheaper than a rejected payment.

What to Gather Before You Contact the Issuer

Pull these together first:

The original purchase receipt or stub, which carries the serial number, dollar amount, and date the issuer needs to find your transaction.
The money order itself, if you still have it. Some issuers and retail locations can process the refund faster when they can see the physical document.
A separate check or money order for 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 exactly; a single transposed digit can stall the claim. Western Union and MoneyGram use different serial number formats, but they appear in the same two places.

How to Cancel and Get a Refund

The steps depend on where you bought the money order.

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 the form at any post office, or mail it to the address printed on the form. The inquiry fee is $21.00 as of January 2026.⁵ Pay it with a separate check or money order; cash is not accepted for mailed submissions. USPS will issue a refund 60 days or later from the original issue date of the money order, or send you a copy of the cashed money order if someone has already redeemed it.⁴ To check status, call 1-866-974-2733.

Western Union

Western Union handles refunds through its online Money Order Refund Request page. Before you submit, the site checks whether the money order has already been cashed; if it has, no refund is available.⁶ You upload proof of purchase, such as a photo of the receipt with 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 comes out of the refund. Western Union says approved refunds are processed within five business days, and you pick them up at any Western Union agent location with a valid government-issued ID.

MoneyGram

MoneyGram uses a Money Order Claim Card attached to the receipt jacket you got at purchase. Fill it out 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 are typically processed within 15 days of receipt.

If you bought the money order at a retailer such as Walmart, you may also be able to get a cash refund at the store within 180 days of purchase, provided 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 the door.

USPS: You can still file PS Form 6401 without the receipt. Provide as much detail as you can — approximate purchase date, dollar amount, and post office location. The search will take longer.
Western Union: Submit the Money Order Research Request form with a $15 non-refundable administrative fee. The online refund form will also accept substitute proof, such as the original store receipt paired with a police report referencing the money order number. Without adequate proof, Western Union runs a search and notifies you of the results within two to four weeks.⁷⁶
MoneyGram: Use the Money Order Number Lookup form on MoneyGram’s service forms page to find your transaction, then file the standard refund 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

Turnaround varies by issuer:

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

If you are mailing your paperwork, send it certified. That gives you a tracking number and delivery confirmation in case the issuer says nothing arrived.

If Someone Already Cashed It

If the issuer finds that the money order has already been redeemed, no refund is issued. You will instead get a photocopy showing the endorsement on the back, so you can see who signed for the funds. That is a different problem from a writing mistake, and it moves into fraud territory rather than a cancellation. If the signature looks forged, contact the issuer’s fraud department and consider filing a police report to create an official record.

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