A check in the mail typically arrives in a standard white or off-white envelope, often with a clear plastic window that shows your name and address printed on the check itself. The envelope is usually a No. 10 size (the standard business envelope) and may feel slightly stiffer than a regular letter because of the check paper inside. Knowing what to look for on both the envelope and the check helps you spot legitimate payments and avoid fakes.
What the Envelope Looks Like
Most checks arrive in window envelopes. The clear window is typically about 1⅛ inches tall and 4½ inches wide, positioned near the lower-left area of the envelope. Your name and mailing address show through this window, printed directly on the check or an attached stub. This eliminates the need for a separate address label.
The envelope often has a tinted or patterned interior lining, usually blue or gray, that prevents anyone from reading the contents by holding the envelope up to light. A return address in the upper-left corner will show the name of the company, bank, government agency, or individual sending the payment. Government checks from the U.S. Treasury typically have a return address referencing the Bureau of the Fiscal Service or the specific agency issuing the payment.
Some checks arrive in plain envelopes without a window, with your address printed or handwritten directly on the outside. Personal checks from individuals almost always come this way. Payroll and business checks more commonly use the window style.
What a Personal or Business Check Looks Like
A standard personal or business check is a rectangular slip of paper, roughly 6 inches wide and 2¾ inches tall. Across the top, you’ll see the name and address of the person or company who wrote it. The check includes several key pieces of information: the date, your name on the “Pay to the order of” line, the dollar amount written both numerically (in a box) and in words (on a line), the name of the issuing bank, and a signature at the bottom right.
Along the bottom edge, you’ll see a string of numbers printed in a blocky, distinctive font called MICR (magnetic ink character recognition). This line contains three sets of numbers: the bank’s routing number (nine digits), the account number, and the check number. The check number also appears in the upper-right corner. Business checks sometimes come attached to a perforated stub that details what the payment is for, such as an invoice number or pay period.
What a U.S. Treasury Check Looks Like
Government checks from the U.S. Treasury, including tax refunds and federal benefit payments, have a distinct appearance and multiple security features built into the paper and ink. The check prominently features the Statue of Liberty on the left side and carries the seal of the Bureau of the Fiscal Service (older stock may reference the Financial Management Service).
The paper itself contains a watermark that reads “U.S. TREASURY,” visible from both the front and back when you hold the check up to a light. This watermark cannot be reproduced by a photocopier. If a check claiming to be from the Treasury has no watermark, treat it as counterfeit.
Treasury checks also use bleeding ink in the Treasury seal. If you dab a small amount of moisture on the black ink of that seal, it will run and turn red. This is an intentional security feature. Additionally, the check contains microprinting in three areas. These tiny words look like a thin line to the naked eye but become legible under magnification. A photocopied or counterfeit version will show a solid line or scattered dots instead of readable text. There’s also an ultraviolet overprinting pattern across the payee and dollar amount area that glows under a black light.
How to Tell If a Check Is Fake
Fake checks are one of the most common mail scams. They often look convincing at first glance but fall apart under closer inspection. Here’s what to watch for:
- Paper quality: Legitimate checks are printed on specialty paper with a slightly textured feel. Fakes often use standard printer paper that feels thin or flimsy.
- Missing or blurry microprinting: Look at the fine lines on the check with a magnifying glass. Real checks have crisp, readable tiny text. Counterfeits show solid lines or pixelated dots.
- No watermark: Hold the check up to a light. Treasury checks should show “U.S. TREASURY.” Many bank checks also have watermarks. A blank, plain sheet of paper is a red flag.
- Incorrect routing numbers: You can verify a bank’s routing number through the Federal Reserve’s online lookup tool. If the routing number doesn’t match the bank printed on the check, it’s fraudulent.
- Unexpected checks with instructions: If you receive a check you weren’t expecting, especially one that asks you to deposit it and send a portion of the money somewhere else, it’s almost certainly a scam. The check will bounce days or weeks after your bank initially makes the funds available, and you’ll owe the full amount back.
Banks are required to make deposited funds available within a set number of business days, but that doesn’t mean the check has actually cleared. A fake check can take weeks to be returned as fraudulent, long after you’ve spent or sent the money. If you receive a check you weren’t expecting from a person or company you don’t recognize, contact the issuing bank directly (using a phone number you find independently, not one printed on the check) before depositing it.
Checks That Come as Part of a Larger Mailing
Not every check arrives on its own. Payroll checks often come with a pay stub attached, showing your gross pay, deductions, and net amount. Insurance claim payments typically include an explanation of benefits document. Tax refund checks from the IRS arrive with a notice explaining the refund amount. In each case, the check portion is perforated so you can tear it away from the accompanying paperwork.
Some checks are disguised as junk mail. Rebate checks, class action settlement payments, and refund checks sometimes arrive in plain envelopes with no branding, making them easy to throw away by mistake. If you’re expecting a payment, open everything before discarding it. Settlement checks in particular can look like bulk marketing mail, with generic return addresses and no indication of what’s inside.