LetterAgent
Mail physical letters by just asking your AI assistant.
Home > Guides > Money order vs cashier's check
A money order is a prepaid payment anyone can buy at a post office, best for smaller amounts; a cashier's check is drawn on the bank's own funds and works for large amounts, but requires a bank account. Use a money order for rent or small bills, and a cashier's check when someone asks for guaranteed funds.
| Money order | Cashier's check | |
|---|---|---|
| Who issues it | Post office, convenience stores, money-transfer outlets | A bank, drawn on its own funds |
| Do you need a bank account? | No | Yes, at the issuing bank |
| Amount limits | Capped per money order; buy several for larger sums | Effectively no cap; the bank verifies the funds when it issues the check |
| Cost | A small flat fee | A higher fee, sometimes waived for account holders |
| If it's lost or stolen | Replaceable with your purchase receipt; the issuer can trace and cancel it | Replacement is slow: the bank typically requires a waiting period and an indemnity agreement |
A money order is prepaid: you hand over cash (or a debit card, at some sellers) plus a small fee, and you get a paper instrument made out to your payee. Because the money is collected up front, a money order can't bounce the way a personal check can. That's why landlords, insurers, and small businesses that don't take personal checks ask for them.
The part people miss: money orders have per-order caps, so a large payment means buying several, each with its own fee and each made out separately. They're also paper, so the usual mailing rules apply: never send cash, but a money order is the safe paper alternative. Keep the purchase receipt, because it's your only proof of payment and your only path to a replacement if the money order goes missing. Without the receipt, tracing it ranges from difficult to impossible.
A cashier's check is the bank's own promise to pay. The bank takes the money from your account when it issues the check, then writes a check drawn on itself, signed by a bank officer. The recipient isn't trusting you; they're trusting the bank, which is why cashier's checks are the standard for large transactions like security deposits, down payments, and private vehicle sales.
Because the bank's name is on it, a cashier's check is much harder to fake convincingly than a personal check, and banks can verify one with a phone call. The trade-off is the replacement process: if a cashier's check is lost, the bank won't just issue another one, because the original could still surface and be cashed twice. Expect a waiting period (often around 90 days) and an indemnity bond or agreement before the bank reissues. So treat a cashier's check like cash once it's in your hands: keep it somewhere safe until it's delivered.
Match the instrument to the amount and the ask. Rent, small bills, or any payment where the recipient just wants something that can't bounce: money order. Large payment where the recipient explicitly wants guaranteed funds: cashier's check. If the recipient named one of the two, don't substitute the other without asking: "guaranteed funds" in a contract or closing checklist usually means a cashier's check (or wire), and a money order won't satisfy it.
For mailing either one, use the same care you'd give a check: a security envelope, the correct address, and tracking or certified mail so you can prove it arrived. And never mail cash to buy a money order at the other end; buy the money order first, then mail the paper.
Ready to mail it? Send your letter with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it's printed and mailed.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com