To fill out a money order, write the recipient’s full legal name on the “Pay to the Order of” line, add your own name and address in the purchaser section, note what the payment is for on the memo or account-number line, and sign the front where it says “Purchaser’s signature.” Do all of it at the counter, right after you pay, and hold onto the receipt.
That’s the whole job. The rest is knowing which line is which, why one signature spot is a trap, and what to do with the money order once it’s filled in.
The Fields on the Form
Every money order carries the same four fields, though the layout shifts a little between USPS, Western Union, MoneyGram, and store-brand issuers. Work through them in this order:
- Pay to the Order of. Write the full legal name of the person or business getting paid. Spell it exactly the way the recipient’s bank, landlord, or biller expects. If you’re paying a company, use the company name, not a contact person. Never leave this line blank, not even for a minute.
- Purchaser, From, or Sender. Write your full name and address. This tells the recipient who the payment came from and gives them a way to reach you if something is off.
- Memo, Payment For, or Account Number. Note what the money order covers. For a bill, write the account number. For rent, write the month and unit number. The line isn’t strictly required, but it heads off disputes about what you paid for.
- Purchaser’s Signature (front). Sign the front of the money order on the line marked for the purchaser or sender. This is your signature as the buyer.
The dollar amount is already printed on the money order by the clerk or machine when you pay, so you don’t write that in yourself. Check that the printed amount matches what you asked for before you leave the counter.
Sign the Front, Not the Back
The single most common mistake is signing the back. The back of a money order has an endorsement line, and that line belongs to the person cashing it, not you. If you sign both sides, the money order can be rejected or cause confusion at the recipient’s bank. Your signature goes on the front, on the line labeled for the purchaser, sender, or “from.”
Fill It Out Before You Leave the Counter
A money order with blank fields is close to a bearer instrument. Anyone who finds a blank one can write in their own name and cash it. That’s why you should complete every field as soon as the clerk hands it to you, standing right there.
Bring what you need with you: the recipient’s exact name and any account or invoice number the payment relates to. If you’re paying rent, know your unit number. If you’re paying a bill, have the account number written down or pulled up on your phone. Filling out the form takes about two minutes when you have the details ready.
Use a pen. Press firmly. Don’t cross out or write over mistakes; if you make an error on any field, ask the clerk about voiding it and issuing a new one before you walk away.
Keep the Receipt
When you pay, you get a receipt or a detachable stub attached to the money order. It shows the serial number, the location number of the post office or store, and the amount. This slip is your only proof that the money order exists and that you’re the one who bought it.
Store it somewhere separate from the money order itself. If you’re mailing the payment and the envelope goes missing, having the receipt at home is what lets you track the money order or request a replacement. If the receipt travels with the money order and both disappear together, everything gets harder.
A quick note on how you paid: USPS accepts only cash and PIN-based debit cards for money order purchases, not personal checks and not credit cards.1USPS. Money Orders – The Basics Most other issuers work the same way. Card networks treat money order purchases as cash advances, so even where a credit card is accepted, you’d trigger cash-advance interest immediately.
Sending or Delivering It
Hand-delivering a filled-out money order is the simplest path and lets you confirm receipt in person. If you’re mailing it, put it in an envelope like you would a check. Don’t fold it more than the envelope requires, and don’t staple anything to the face of the document.
For a payment large enough to worry about, USPS Certified Mail adds a mailing receipt and electronic delivery confirmation for $5.30 on top of regular postage.2USPS. Notice 123 – Price List Effective January 18, 2026 A return receipt, which gets you a signed confirmation from the recipient, costs another $4.40 on paper or $2.82 electronically. Weigh those costs against the payment amount; on a $500 money order, certified mailing can push your total costs close to $16.
Confirming It Was Cashed
USPS lets you check whether a domestic money order has been cashed through a free online tool. You’ll need three things from your receipt: the serial number, the post office number where you bought it, and the dollar amount.3USPS. Money Orders The tool tells you whether the money order is still outstanding or has been processed. Private issuers have their own customer service numbers or websites listed on the receipt.
If weeks go by without the money order clearing, contact the recipient first. Large organizations sometimes batch incoming payments and take longer than you’d expect to process them.
If It’s Lost or Stolen
You can’t stop payment on a USPS money order the way you can cancel a check, but you can ask for a replacement. Bring your original receipt to any post office, fill out a Money Order Inquiry form, and pay a $21.00 processing fee.4USPS. Money Orders The investigation can take up to 60 days. If USPS confirms the money order was never cashed, they issue a replacement. If someone cashed it fraudulently, the process runs longer and may involve the Postal Inspection Service.
Without the receipt, this gets much harder. You’ll have to reconstruct the approximate date and location of purchase, which slows the investigation. This is why keeping the receipt separate from the money order matters more than it seems at the time.
One useful fact if you find an old money order in a drawer: USPS domestic money orders never expire and don’t accrue interest.4USPS. Money Orders It’s still good. Some private issuers, though, deduct dormancy fees from the face value of uncashed money orders after a period of inactivity, so check the fine print on non-USPS ones.
A Note on International Payments
If you were planning to send a money order overseas: USPS stopped selling international postal money orders in October 2024 and stopped cashing foreign-issued international money orders as of October 1, 2025.5USPS. Sending Money Internationally Domestic USPS money orders aren’t designed for international use and may not be accepted by foreign banks or postal systems. If you’re holding an unredeemed USPS international money order purchased before the cutoff, contact your local post office about redemption.