You might sign the back of a money order only if you’re making one out to yourself. In that case, check with your bank before depositing it via mobile deposit — not all banks allow it.

Sign the front of the money order, not the back. Next, you'll need to add your signature to the money order. The sender's signature line will be on the front at the bottom right-hand side.

Discover what a money order is in 2025 and where to buy one. ... The recipient will then endorse the back and deposit it like a check in their bank account, or cash it.