The routing transit number on a U.S. Treasury check is printed in magnetic ink along the bottom edge, sitting in the middle of the MICR line between two small transit symbols that look like vertical bars with dots. Every Treasury check carries the same nine-digit RTN: 000000518. That single number identifies the federal government’s disbursing account rather than any commercial bank, so it appears on tax refunds, Social Security payments, veterans’ benefits, and every other check the Treasury issues.
Reading the MICR Line on a Treasury Check
The bottom half-inch of the check contains a row of characters printed in a special font called Magnetic Ink Character Recognition, or MICR. Banks and mobile deposit apps use this ink to read check data automatically.1Treasury Financial Experience (TFX). Chapter 5000 Requisitioning, Preparing, and Issuing Treasury Checks Three groups of digits sit along that line, each set off by distinctive symbols.
Reading left to right, the line is organized like this:
- Account symbol number on the far left, identifying the government disbursing account.
- The nine-digit routing transit number (000000518) in the middle, flanked by transit symbols.1Treasury Financial Experience (TFX). Chapter 5000 Requisitioning, Preparing, and Issuing Treasury Checks
- Check serial number on the right, unique to that individual check.
This layout differs from most personal checks, where the routing number is the first group on the left. On a Treasury check, the account symbol occupies that leftmost spot, so if you scan from the left edge you’ll pass one set of digits before reaching the RTN.
Spotting the Transit Symbols
The transit symbol is the visual marker that brackets the routing number. It looks like a short vertical bar with a dot above and below, or beside it, and it appears only around the RTN. Anything printed between two of those symbols is the routing number. Anything outside them is not.
What the Number 000000518 Actually Means
Every U.S. Treasury check uses the same routing number. The digits 00000051 are preprinted in MICR ink, followed by the check digit 8.1Treasury Financial Experience (TFX). Chapter 5000 Requisitioning, Preparing, and Issuing Treasury Checks Commercial routing numbers vary by bank and by Federal Reserve district. The Treasury’s single number routes all federal disbursements through one account, no matter which agency authorized the payment.
The first four digits of a normal routing number identify a Federal Reserve district and processing center for a specific bank. The leading zeros on the Treasury’s number signal that the check originates from the federal government rather than a commercial institution.2Bureau of the Fiscal Service, U.S. Department of the Treasury. Routing Transit Number (RTN) If the routing number on a check you’ve been handed doesn’t read 000000518, it isn’t a genuine Treasury check.
How the Ninth Digit Verifies the Other Eight
The ninth digit of any routing number is a check digit, built into the number as an error-detection tool. Banks and deposit software run a formula against the first eight digits, and the result has to match that ninth digit. If a single digit is misread or altered, the formula fails and the check is flagged.
For 000000518, the check digit is 8. You can confirm it with the standard modulus-10 formula: multiply each of the first eight digits by a fixed set of weights (7, 3, 9, 7, 3, 9, 7, 3), add the results, and the last digit of that sum should equal 8. Most people never need to run the calculation themselves, but it explains why depositing software can catch a bad photo or a doctored check before it reaches a human reviewer.
Confirming the Check Is Genuine Before You Deposit
Matching the routing number to 000000518 is one quick authenticity check. A watermark is another. Hold the check up to a light and you should see “U.S. TREASURY” readable from both sides. A photocopier cannot reproduce the watermark, so any check missing it should be treated as suspicious.3Bureau of the Fiscal Service. U.S. Treasury Check Security Features
The check also carries security ink in the Treasury seal beside the Statue of Liberty vignette. If you dab moisture on the black seal, the ink runs and turns red. Microprinting appears in three areas and looks like a thin line to the naked eye; under magnification, the letters become readable, and a photocopy turns them into a solid line or scattered dots. Under a black light, a pattern of “FISCALSERVICE” text and agency seals glows across the payee and dollar-amount area.3Bureau of the Fiscal Service. U.S. Treasury Check Security Features
Most of those tests aren’t practical through a phone camera. Confirming the watermark and matching the RTN to 000000518 are the two you can do in a few seconds before starting a mobile deposit.
Do You Have to Type 000000518 Into Your Banking App?
Usually, no. When you deposit a Treasury check through a mobile banking app, the app asks you to photograph the front and back of the check. Optical character recognition software reads the MICR line from your image and pulls the routing number, serial number, and account symbol automatically. You typically only enter the check amount by hand so the app can cross-check it against the printed figures.
If the app can’t read the MICR line, it will reject the deposit and ask you to retake the picture. The usual culprits are a blurry photo, poor lighting, or a fold running through the bottom edge of the check. Flattening the check on a dark, high-contrast surface and making sure the entire bottom edge is visible in the frame will usually resolve it. Torn or heavily creased checks may have to go to a branch instead.
A few older or web-based deposit tools do ask you to type the routing number manually. In that case, enter 000000518, exactly as printed, with all six leading zeros. Dropping the zeros will fail validation, because the check digit calculation depends on every digit being in place.
Where the RTN Is Not
Two quick points of confusion are worth clearing up. The routing number on a Treasury check is not the same as your own bank’s routing number, which appears nowhere on the check. It’s also not the check serial number on the right side of the MICR line, which identifies that individual check and changes on every one. If someone asks for “the routing number on your Treasury check,” they mean the nine digits between the transit symbols in the middle: 000000518, the same on every Treasury check ever issued.