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Parts of a Check Explained (With Diagram in Words)

7 min read · Updated October 6, 2026 · By the Check Writer 123 team

A check has these parts: payer name and address, bank name, check number, date, payee, amount in numbers, amount in words, memo, signature, fractional routing number, and a MICR line holding the routing, account and check numbers. The top shows who and when, the middle the money, and the bottom the bank data.

Layouts vary a little between banks, but the parts are the same on nearly every US check. Read the next section as a picture in words, then use the table to look up any single part.

What does a check look like, top to bottom?

Picture a check lying flat in front of you, wider than it is tall. The upper left corner holds the name and address of the person or business that owns the account. The upper right holds the check number and, just below it, the date line.

Under those, across the middle, sits the payee line that starts with Pay to the order of. At the right end of that line is a box for the amount in numbers. The next line down is a long line for the amount in words, ending with the word Dollars.

Below the amount in words, the bank's name and address often sit at the left. At the lower left is the memo line, marked Memo or For, and at the lower right is the signature line. Along the very bottom edge runs the MICR line, a row of odd-looking digits and symbols in magnetic ink.

A table of every part

PartWhere it sitsWhat it doesWho fills it in
Payer name and addressUpper leftShows who owns the accountPrinted on the check
Bank nameNear the middle or lower leftShows which bank holds the accountPrinted on the check
Check numberUpper right, and again in the MICR lineTracks each check in orderPrinted on the check
DateUpper right, below the check numberRecords when the check was writtenYou
Payee lineMiddle left, after Pay to the order ofNames who gets the moneyYou
Amount in numbersRight end of the payee line, in a boxThe courtesy amountYou
Amount in wordsLine below the payeeThe legal amountYou
MemoLower leftA note about the purposeYou
SignatureLower rightAuthorizes paymentYou or an authorized signer
Fractional routing numberUpper right, near the dateA coded bank identifier used in sortingPrinted on the check
MICR lineBottom edgeRouting, account and check numbers for machinesPrinted on the check

Which parts do you fill in yourself?

Six parts: the date, the payee, the amount in numbers, the amount in words, the memo and the signature. The first four decide who gets paid, how much and when, so they are the ones a thief tries to change. The memo is optional. The signature is what authorizes the bank to pay.

What is the difference between the numeric and written amount?

The amount in numbers is often called the courtesy amount, and the amount in words is the legal amount. If they disagree, banks generally pay the written amount, though a bank may also return the check for clarification. Make them match so there is no doubt.

What are the routing number, account number and check number?

These three numbers are printed in the MICR line at the bottom. The routing number is nine digits and identifies the bank. The account number identifies your account at that bank. The check number identifies the individual check.

On many personal checks the MICR order is routing number, account number, then check number. On larger business checks the check number often comes first at the left. Your own check is the best guide, so find the nine-digit group between the two bracket-like symbols and you have your routing number.

What is the MICR line?

MICR stands for Magnetic Ink Character Recognition. The line uses a special font called E-13B, along with four symbols that act as separators. Bank machines read it to sort the check and post the payment to the right account. Because it is machine-read, it has to be clean, correctly placed and complete. Read what the MICR line is for a symbol-by-symbol breakdown.

What is the fractional routing number?

The fractional routing number is the small fraction near the top right, such as 12-3456/7890. The top number is a prefix that traces back to the city or state of the bank, and the bottom number is a code related to the bank's routing number. It was designed for sorting paper checks before images and is rarely needed by account holders today.

You can ignore it when you write a check. When you set up a check printing tool, you use the nine-digit routing number from the MICR line, not the fraction.

What is on the back of a check?

The back has an area for the payee's endorsement, which is where the payee signs to deposit or cash the check. Banks stamp it as the check moves through the system. Security features and a security statement are often printed there too. Do not write outside the endorsement area, since extra marks can interfere with processing.

Which parts are legally important?

A check generally needs a payee, an amount, a signature of the person who owns the account, and the bank's identifying information. The date matters for when it can be presented, and the memo is not required. If you want the full picture, read can you print your own checks. Banking and legal rules vary, so confirm anything important with your bank.

Check Writer 123 is made by the publisher of this site. It fills in the amount in words automatically, shows a live preview of every part of the check, and prints the full check, MICR line included, on blank check stock. Save your bank name, address, logo and signature once, then enter only the payee, amount, date and memo. Start with the 14-day free trial, no card needed, and see print checks online.

Next steps

Keep a real check beside you and trace each part with this table. If you are writing one by hand, follow how to write a check step by step. If you are setting up a printing tool, collect your bank name, routing number and account number from the bottom of a check first.

Frequently asked questions

What are the parts of a check?

A check has the payer's name and address, bank name, check number, date, payee line, amount in numbers, amount in words, memo, signature line, fractional routing number and a MICR line along the bottom. The MICR line holds the routing number, account number and check number, which banks read by machine.

Where are the routing number and account number on a check?

Both are in the MICR line along the bottom edge. The routing number is the nine-digit group, usually at the left between two bracket-shaped symbols. The account number is the group next to it, followed by a symbol that looks like a hook. The check number often appears at the right, or at the far left on business checks.

What is the difference between the amount in numbers and the amount in words?

The amount in numbers, called the courtesy amount, sits in the box at the right. The amount in words, called the legal amount, is on the line below the payee. Banks generally pay the written amount when the two differ, so make them match and fill any leftover space on the words line with a line.

What is the fraction in the corner of a check?

It is the fractional routing number, a coded identifier from the days of paper sorting. The top number relates to the bank's city or state, and the bottom number relates to its routing number. It does not affect how you write a check, and you use the nine-digit routing number in the MICR line instead.

Do I need to fill in the memo line on a check?

No. The memo line is optional and the bank does not use it to process the payment. People use it for an invoice number, an account number or a reason such as rent or May supplies. A short note helps with your records and helps the payee apply the payment correctly.

Print your own checks in minutes

Check Writer 123 lays out the check, writes the amount in words and prints the MICR line for you, on blank check stock, pre-printed stock or plain paper. Try it free for 14 days, no card needed.