Checks might feel old-fashioned, but people still use them for rent, bills, and big payments. Here's how a checking account actually works — and how to write, read, endorse, and deposit a check like a pro.
A checking account is a bank account made for everyday spending. Instead of carrying cash everywhere, you keep your money at the bank, and the bank gives you ways to access it: a debit card, online transfers, and paper checks.
A check is really just a written instruction. When you write one, you're telling your bank: "Take this exact amount of money out of my account and give it to this specific person or business." Writing a check doesn't immediately transfer the money — the check must be deposited or cashed before the payment process begins.
Because of that, it's your job to make sure the money is actually there before you hand a check over. Writing a check for more than you have in your account can lead to an overdraft (the bank covers it, but usually charges a fee) or the check simply bouncing — getting returned unpaid, which can mean fees on both ends and an unhappy payee.
Every check has two important numbers printed along the bottom, and it's easy to mix them up. Think of it like a home address:
A 9-digit number that identifies the bank or financial institution the money is coming from — like the street name and city. A bank can have more than one routing number depending on location or transaction type, but everyone using that particular routing number is pointing to the same institution.
A number unique to your specific account — like the house number on that street. It identifies your particular account at that financial institution.
Together, the routing number and account number tell the banking system exactly where to pull the money from — the bank, and then the exact account inside that bank.
Click each numbered dot on the check below to learn what that part means. Try to click all nine!
Click any numbered dot on the check to learn what it means.
Fill in the fields below and watch the check fill itself out — including converting your amount into words, exactly the way a real check requires.
Which version below is written the correct way for a real check?
Before depositing or cashing a check, you will generally need to endorse it — sign the back. There are two endorsements you'll actually use:
Just your signature. Once you sign, the check becomes like cash — anyone who has it could cash it. Only sign this way right before you hand the check to a teller in person.
Your signature plus an instruction like "For Deposit Only" — though by itself, that phrase doesn't point to a specific account. Adding your account number is what actually locks the check to that one account. Banks vary in exactly what they require for mobile deposit, so it's worth checking your bank's instructions.
Try the scenarios below — pick the endorsement that fits each situation:
You don't always have to walk into a bank branch to deposit a check. Two common ways to do it without a teller: snapping a photo with your bank's app, or feeding the check into an ATM. Every bank's app and every ATM looks a little different, so always follow your own bank's on-screen instructions — but here's what the typical process looks like for each.
Your routing number and account number aren't secret the way a password is — you actually hand them out fairly often. Giving your account and routing number to your employer for direct deposit, or to a landlord for rent, is normal and safe, the same way you'd give someone your mailing address.
What you should never share, though:
A few habits that keep an account safe: use a strong, unique password for your banking app and turn on two-factor authentication if it's offered; check your account activity regularly for charges you don't recognize; and shred paper statements and old checks instead of tossing them in the trash whole.
See if you can spot which of these are normal banking requests and which are red flags.
ACH stands for Automated Clearing House — it's the electronic network banks use to move money directly between accounts, without anyone writing a paper check. ACH is one of the major electronic payment networks used to move money between U.S. bank accounts.
Money moving into your account because someone else sent it — like your employer depositing your paycheck straight into your checking account.
Money moving out of your account because you gave a company permission to take it — like an automatic payment for a phone bill or streaming subscription.
Common examples of ACH in everyday life:
ACH transfers often take one to three business days to complete, though some can be same-day or next-day depending on the transaction — slower on average than instant apps like Zelle, but they typically don't charge a fee, unlike a wire transfer. Because ACH pulls require you to give a company permission ahead of time, it's worth reading the fine print before signing up for autopay, and checking your statements so you don't get surprised by a subscription you forgot to cancel.
A check register is a running log — on paper in the back of a checkbook, or digitally in an app — where you record every transaction that touches your account: checks you write, debit card purchases, ATM withdrawals, and deposits. Each entry shows the date, what it was for, whether money went out or came in, and a running balance updated after every entry.
Keeping a register matters because your bank's app balance and your real spendable balance aren't always the same thing. A check you wrote yesterday might not show up in the app until the person deposits it days later — but that money is already spoken for. A register is how you keep track of money you've committed to spending, even before it officially leaves your account — and it's how you catch a problem before it becomes an overdraft.
Jordan started the week with $150.00 in checking. Fill in the missing balance after each transaction, then check your work.
| Date | Description | Payment (–) | Deposit (+) | Balance |
|---|---|---|---|---|
| 8/1 | Starting Balance | — | — | $150.00 |
| 8/2 | Groceries (debit card) | $42.15 | — | |
| 8/5 | Paycheck (direct deposit) | — | $210.00 | |
| 8/9 | Check #1024 — Piano Lessons | $45.00 | — | |
| 8/12 | ATM Withdrawal | $40.00 | — |
Most banks let you see your account activity anytime through their app or website. It's worth learning to tell two kinds of transactions apart:
The bank sees the transaction has started — like a debit card swipe — but it hasn't fully processed yet. The amount is usually already held out of what you can spend, even though it's not "official" yet.
The transaction is complete and permanently recorded. Posted transactions are what eventually show up on your monthly statement.
A bank statement is a monthly summary the bank sends (or posts in the app) listing every posted transaction, plus your starting and ending balance for the month. Reconciling means comparing that statement against your own check register to make sure the two agree — and to catch anything that looks off.