A bank line of credit is money a bank agrees to lend you on demand, up to a set limit, and you pay interest only on what you actually borrow

Unlike a loan where you receive a lump sum upfront, a line of credit works like a flexible account. The bank approves you for a maximum amount — say $10,000 or $50,000 — and you can draw from it whenever you need cash, repay it, and borrow again without reapplying. You only owe interest on the balance you're carrying at any given time, not on the full approved amount sitting unused.

Banks offer lines of credit to both individuals and businesses. A personal line of credit might help you cover unexpected medical bills or home repairs. A business line of credit helps a company manage cash flow during slow seasons or fund short-term operations. The mechanics are the same: borrow what you need, pay interest on it, and the credit remains available to you as long as your account stays in good standing.

Key Takeaways

  • You only pay interest on the money you actually withdraw, not on your full credit limit.
  • A line of credit is revolving — you can borrow, repay, and borrow again without a new application each time.
  • Banks set a credit limit based on your credit score, income, and history, and they can lower or close the line if your financial situation changes.
  • Interest rates on lines of credit are usually variable, meaning they move up or down with the bank's prime rate.
  • Personal lines of credit often require no collateral, while business lines may require a personal may provide or business assets as security.

How the borrowing and repayment cycle works

Once approved, you access your line of credit through a checkbook, debit card, online transfer, or phone call to the bank. You withdraw only what you need at that moment. If you borrow $3,000 of your $10,000 limit, you owe interest only on that $3,000. As you repay it, the borrowed amount becomes available again — you don't have to reapply or wait for approval.

Most lines of credit require a minimum monthly payment, usually just the interest owed plus a small portion of the principal. Some accounts let you pay interest-only for a set period (often called a draw period), then require you to start repaying principal. Others require principal repayment from the start. The exact terms depend on your bank and the type of line you open.

This flexibility makes a line of credit useful for unpredictable expenses. You're not forced to borrow money you don't need yet, and you're not locked into a fixed repayment schedule the way you are with a traditional loan.

Interest rates and how they're set

Most bank lines of credit carry a variable interest rate, which means the rate changes over time. The bank typically ties your rate to the prime rate — the interest rate banks charge their most creditworthy customers. When the Federal Reserve raises or lowers its benchmark rate, the prime rate moves, and your line of credit rate moves with it.

Your actual rate will be the prime rate plus a margin the bank adds based on your creditworthiness. If the prime rate is 8% and the bank adds a 2% margin, your rate is 10%. If the prime rate drops to 7%, your rate drops to 9%. This means your monthly payment can change, sometimes significantly, if interest rates shift.

Some banks offer fixed-rate lines of credit, where your rate stays the same for the life of the account, but these are less common and often come with higher starting rates. Before opening a line of credit, ask your bank whether the rate is fixed or variable, what the current rate is, and what the highest rate could go if interest rates rise sharply.

What banks look at when deciding your limit

Your credit limit depends on several factors the bank evaluates. Your credit score is the biggest one — a higher score usually means a higher limit. Banks also look at your income, employment history, existing debt, and payment history on other accounts. If you've missed payments on credit cards or loans, the bank may offer a lower limit or deny you altogether.

For a personal line of credit, the bank may ask for proof of income (pay stubs, tax returns) and will pull your credit report. For a business line, they'll want to see business tax returns, bank statements, and sometimes a personal may provide from the owner. Some banks base the limit on a percentage of your home's equity if you're offering your house as collateral.

The limit isn't permanent. If your credit score drops, you miss payments, or your income declines, the bank can lower your limit or close the line entirely. Conversely, if you use the line responsibly and your credit improves, the bank may increase your limit over time.

Personal lines of credit versus secured lines

A personal line of credit (also called an unsecured line) requires no collateral. The bank lends based on your creditworthiness alone. Because the bank has no asset to seize if you don't repay, these lines typically come with higher interest rates and lower limits than secured alternatives.

A secured line of credit is backed by collateral — usually your home (called a home equity line of credit or HELOC) or savings account. Because the bank can take the collateral if you default, secured lines often have lower interest rates and higher limits. The tradeoff is risk: if you can't repay a HELOC, the bank can foreclose on your home.

A home equity line of credit is the most common secured line for individuals. You borrow against the equity you've built in your house — the difference between what your home is worth and what you owe on your mortgage. These lines typically offer lower rates than personal lines because the bank's risk is lower.

When a line of credit makes sense versus other borrowing options

A line of credit is most useful when you face ongoing or unpredictable expenses but don't know the exact amount or timing. A business managing seasonal cash flow, a homeowner planning renovations over several months, or someone with recurring medical costs might all benefit from having a line available.

A traditional loan works better if you need a specific amount upfront and want a fixed repayment schedule. If you need $15,000 for a car, a car loan locks in your rate and term. A credit card is better for small, frequent purchases you can pay off quickly. A line of credit sits in the middle — more flexible than a loan, but usually with lower rates than a credit card.

The danger with a line of credit is the temptation to keep borrowing. Because the money is easy to access and you only pay interest on what you use, it's simple to let the balance grow without a clear repayment plan. Before opening one, think about what you'll actually use it for and set a personal limit on how much you'll borrow.

What happens if you can't repay

If you miss payments on a line of credit, the bank will charge late fees and report the missed payment to credit bureaus, damaging your credit score. After a certain number of missed payments (usually 60 to 90 days), the bank may freeze your account, preventing further withdrawals, and demand full repayment of the balance immediately.

If you still don't pay, the bank may send your account to a collection agency or sue you for the debt. For a secured line like a HELOC, the bank can foreclose on your home. For an unsecured personal line, the bank can garnish your wages or place a lien on your property.

If you're struggling to repay, contact your bank as soon as possible. Some banks offer hardship programs that lower your payment temporarily or pause interest accrual. It's always better to negotiate before you fall behind than to wait for collection calls.

Frequently Asked Questions

Can a bank close my line of credit without warning?

Yes. Banks can close or reduce your line of credit if your credit score drops, you miss payments, or economic conditions change. They typically give notice, but the timeline varies. If you rely on a line of credit for business operations, don't assume it will always be available — have a backup plan.

Is a line of credit the same as a credit card?

Both are revolving credit, but they work differently. A credit card is issued by a card network (Visa, Mastercard) and used for purchases. A line of credit is a bank loan you access by check, transfer, or debit card. Lines of credit usually have lower interest rates but higher minimum payments than credit cards.

What's the difference between a draw period and a repayment period?

During the draw period (often 5 to 10 years), you can borrow and repay as needed, usually paying interest-only. During the repayment period, you can no longer borrow and must pay back the full balance, usually over 10 to 20 years. Not all lines of credit have both periods — some require principal repayment from the start.

Do I need good credit to get a line of credit?

Most banks require a credit score of at least 650 to 700 for a personal line of credit, though some offer lines to people with lower scores at higher rates. If your score is below 650, you may still may have access to for a secured line backed by savings or home equity, or you may need to improve your score first.

Can I use a line of credit for anything I want?

For a personal line of credit, yes — you can use it for any purpose. For a business line, the bank may restrict use to business expenses only. For a home equity line of credit, some banks restrict use to home-related expenses, though many allow any use. Check your loan agreement for restrictions.