A bank loan is money the bank lends you, which you repay in fixed payments over a set period, with interest added on top

When you borrow from a bank, you receive a lump sum of money upfront. The bank charges you interest—a percentage of the loan amount—for letting you use their money. You pay back the total (principal plus interest) in regular installments, usually monthly, until the loan is gone. The bank holds the right to take back collateral (like a car or house) if you stop paying.

The core mechanics are simple: borrow now, pay back later with a cost attached. But the details—how much interest you pay, how long you have to repay, what happens if you miss a payment—depend on the type of loan, your credit history, and the bank's terms.

Key Takeaways

  • You receive the full loan amount upfront and repay it in monthly installments that include both principal and interest.
  • Interest rates vary based on your credit score, the loan type, and current market conditions—a higher credit score usually means a lower rate.
  • Secured loans (backed by collateral like a house or car) typically have lower interest rates than unsecured loans (backed only by your promise to pay).
  • Missing a payment damages your credit score, triggers late fees, and can lead to default, where the bank may seize collateral or pursue legal action.
  • The total cost of a loan depends on the interest rate, the loan term (how many years you have to repay), and how much you borrow.

The difference between secured and unsecured loans

Secured loans are backed by something of value you own—your house, car, savings account, or other assets. If you stop paying, the bank can take that asset (called collateral) to recover their money. Because the bank has this safety net, they charge lower interest rates on secured loans. A mortgage (a loan to buy a house) and an auto loan (a loan to buy a car) are secured loans.

Unsecured loans have no collateral behind them. The bank is lending based only on your promise to repay and your credit history. Because the bank has no way to recover money if you default, they charge higher interest rates to offset that risk. Personal loans and credit cards are unsecured. If you have a lower credit score, an unsecured loan will cost you significantly more in interest.

The trade-off is real: a secured loan costs less but puts your assets at risk. An unsecured loan protects your assets but costs more.

How interest rates are set and what affects yours

Banks do not set interest rates randomly. They start with a base rate set by the Federal Reserve, then add a margin based on how risky they think you are as a borrower. Your credit score—a three-digit number that reflects your payment history, how much debt you carry, and how long you have had credit—is the biggest factor. A score of 750 or higher usually qualifies you for the lowest rates. A score below 650 means you will pay significantly more.

Other factors that affect your rate include the type of loan, the loan term (how many years you have to repay), how much you are borrowing, and current economic conditions. A 15-year mortgage will have a different rate than a 30-year mortgage, even for the same borrower. A $5,000 personal loan might carry a higher rate than a $50,000 personal loan because the bank's cost to process a small loan is proportionally higher.

You can shop around: different banks offer different rates for the same loan type. Checking rates from three to five banks before you commit can save you hundreds or thousands of dollars over the life of the loan.

How monthly payments are calculated

Your monthly payment is not simply the loan amount divided by the number of months. It includes both principal (the money you borrowed) and interest (the bank's fee). Early in the loan, most of your payment goes toward interest. As time passes, more of each payment goes toward principal. By the end, you are paying mostly principal.

The bank uses a formula that spreads the interest and principal across all your payments so that the amount you pay each month stays the same. If you borrow $10,000 at 8% interest over five years, your monthly payment will be roughly $202. Over 60 months, you will pay about $12,120 total—meaning $2,120 went to the bank as interest.

You can calculate your own payment using an online loan calculator (search "loan payment calculator"), or ask the bank for an amortization schedule, which shows exactly how much principal and interest you pay each month for the life of the loan.

What happens if you miss a payment

Missing a single payment triggers immediate consequences. The bank will charge you a late fee (usually $25 to $50, depending on the loan type and bank). Your payment will be reported to the credit bureaus, and your credit score will drop—sometimes by 100 points or more, depending on how late you are. A late payment stays on your credit report for seven years.

If you are 30 days late, the bank may contact you by phone or mail. If you are 60 days late, the situation worsens: more fees accumulate, and the damage to your credit score deepens. At 90 days late, the bank may declare the loan in default, meaning you have violated the loan agreement. At this point, the bank can pursue several options: they can sue you, garnish your wages, or (if the loan is secured) seize the collateral.

If you know you will miss a payment, contact the bank before the due date. Many banks offer forbearance (temporarily pausing or reducing payments) or deferment (pushing payments to later in the loan term) if you explain your situation. These options damage your credit less than a missed payment and keep you out of default.

The total cost of borrowing: principal, interest, and fees

The amount you borrow is only part of what you will pay. Interest is the main cost, but fees add up too. Common loan fees include an origination fee (charged when the loan is created, usually 1% to 5% of the loan amount), a prepayment penalty (charged if you pay off the loan early), and late fees (charged if you miss a payment).

To compare loans fairly, look at the Annual Percentage Rate (APR), not just the interest rate. The APR includes the interest rate plus fees, spread across a year, so it shows the true cost of borrowing. A loan with a 5% interest rate and a 3% origination fee might have an APR of 5.8%. Comparing APRs across banks tells you which loan actually costs less.

A $20,000 car loan at 6% APR over five years will cost you about $23,600 total—meaning $3,600 goes to the bank as interest and fees. The same loan at 8% APR costs about $24,600. That $1,000 difference is why shopping around matters.

When you can pay off a loan early

Most loans allow you to pay off the balance early without penalty, though some loans charge a prepayment penalty to discourage this. Check your loan agreement or ask the bank before you sign. If there is no penalty, paying extra toward principal each month or making a lump-sum payment when you can will save you interest and shorten the loan term.

If you pay $250 per month instead of $200 on a $10,000 loan, you will pay off the debt faster and pay less total interest. The bank will apply the extra $50 to principal, not interest, so it directly reduces what you owe. Some borrowers make one extra payment per year or put tax refunds toward the loan for this reason.

Frequently Asked Questions

What is the difference between a loan and a line of credit?

A loan gives you a lump sum upfront that you repay in fixed installments. A line of credit (like a credit card or home equity line of credit) lets you borrow up to a limit, repay it, and borrow again—you only pay interest on what you actually use. Lines of credit are more flexible but often carry higher interest rates.

Can I get a loan if I have bad credit?

Yes, but you will pay a higher interest rate. Banks view borrowers with low credit scores as riskier, so they charge more to offset that risk. Some banks specialize in loans for people with poor credit; others may require a co-signer (someone who promises to repay if you do not) or collateral to approve you.

What happens if I pay off a loan early?

You stop paying interest once the loan is gone, which saves you money. However, some loans charge a prepayment penalty—a fee for paying early. Check your loan agreement before you sign. If there is no penalty, paying extra toward principal each month reduces the total interest you pay.

How long does it take to get approved for a loan?

Most banks can approve a personal loan in one to three business days if you apply online and have all documents ready. Mortgages and auto loans take longer—usually 30 to 45 days—because the bank must verify the property or vehicle and conduct a more thorough review of your finances.

What is an amortization schedule?

An amortization schedule is a table showing every payment you will make over the life of the loan, broken down into how much goes to principal and how much goes to interest. It shows the remaining balance after each payment. You can request one from the bank before you sign the loan agreement.