To pay back a line of credit, you make at least the required minimum payment each billing cycle, which your lender sets as a percentage of your outstanding balance or a flat-dollar floor, whichever is higher. Because the account revolves, every dollar of principal you repay becomes available to borrow again, which is the main difference from a traditional installment loan. What makes repayment trickier than it looks is how interest accrues daily, how your payments get split between fees, interest, and principal, and how the rules shift depending on whether the line is secured by your home or unsecured.
How Minimum Payments Work
Your lender sets a minimum you owe each month to keep the account current. It’s usually a percentage of what you currently owe, commonly between 1% and 5% of the outstanding balance.1Federal Reserve Bank of Dallas. Payment Calculator: Credit Cards and Other Revolving Credit Loans If the percentage math produces a tiny number, most lenders impose a flat minimum instead, often around $25 to $50, so the balance actually moves.
Some lines of credit let you pay only the interest during an initial period, with no principal reduction required. That keeps the monthly cost low at first, but the balance stays exactly where it started. Other structures build a portion of principal into every payment, which steadily shrinks what you owe. Your account agreement spells out which applies.
For accounts not secured by your home, lenders must give you at least 45 days’ written notice before changing the minimum payment formula or any other significant term.2eCFR. 12 CFR 1026.9 – Subsequent Disclosure Requirements Home equity lines follow a shorter 15-day window. Either way, a payment increase shouldn’t arrive without warning.
How Interest Accrues Between Payments
Interest on a line of credit isn’t calculated once a month and tacked on. It compounds daily. Your lender divides your annual percentage rate by either 360 or 365 days to get a daily periodic rate, then multiplies that tiny rate by whatever you owe at the close of each day.3Consumer Financial Protection Bureau. What Is a Daily Periodic Rate on a Credit Card At the end of the billing cycle, those daily charges get totaled into the interest line on your statement.
This makes timing matter more than most borrowers realize. Draw $5,000 on the first day of a billing cycle and you pay interest on that amount for the whole month. Draw the same $5,000 three days before the cycle closes and you only accrue three days of charges. Paying early in the cycle works in the opposite direction: it lowers your average daily balance and reduces the interest you owe.
Most lines of credit carry a variable rate rather than a fixed one. The rate is built from a benchmark index, usually the prime rate, plus a margin set when you open the account. If prime rises half a point, your rate follows. The margin itself stays constant, so the only moving piece is the index. For home equity lines, lenders must disclose how the variable rate is calculated and what caps limit how high it can go.2eCFR. 12 CFR 1026.9 – Subsequent Disclosure Requirements
How Lenders Apply What You Send
When your payment posts, it doesn’t all go to reducing the balance. The lender applies funds first to any outstanding fees like late charges or annual fees, then to accrued interest for the cycle, and only what’s left reduces principal. This is where the math frustrates people. On a $10,000 balance with $150 in monthly interest and a $200 minimum payment, only $50 actually chips away at the debt.
For credit-card-style lines of credit that aren’t secured by your home, federal rules add a borrower-friendly twist: any amount you pay above the minimum must go to the portion of your balance carrying the highest interest rate first, then to successively lower rates.4eCFR. 12 CFR 1026.53 – Allocation of Payments The minimum itself can be allocated however the lender chooses, but every extra dollar targets the most expensive debt first. Home equity lines are excluded from this rule, so check your agreement for how those payments are distributed.
What Happens If You Only Pay the Minimum
If your minimum payment doesn’t fully cover the interest charged that month, the shortfall gets added to your principal. You then owe interest on the original balance plus last month’s unpaid interest, a cycle called negative amortization.5Consumer Financial Protection Bureau. What Is Negative Amortization Your debt actually grows while you’re making payments. This happens most often during interest-only periods when rates spike: the minimum was set at an older, lower rate, and the new interest charges exceed what you’re required to send.
Even when the minimum does cover all the interest, paying only that amount barely moves the principal. On a $20,000 balance at 9% with a 2% minimum payment, your first month’s payment is $400, but roughly $150 of that is interest. The balance drops to $19,850. Next month the math repeats on a marginally smaller number. At that pace, full repayment takes decades and the total interest paid dwarfs the original balance. Sending even $50 or $100 above the minimum accelerates the payoff substantially, because every extra dollar goes straight to principal once fees and interest are covered.
Draw Period vs Repayment Period on a HELOC
Home equity lines have a structural twist that catches many borrowers off guard. The account is divided into two phases, and your payment obligations change sharply at the boundary.
The Draw Period
During the first phase, typically ten years, you can borrow up to your credit limit and most lenders require only interest payments on whatever you’ve used. Some lenders require a small principal component, but interest-only is the norm. The line stays open and revolving throughout this phase.
The Repayment Period
When the draw period ends, the line closes to new borrowing and the lender converts the outstanding balance into a fully amortized loan, typically spread over ten to twenty years. Your payment now includes both principal and interest, and the jump can be significant. A borrower paying $300 a month in interest-only on a $60,000 balance might suddenly owe $550 or more once principal amortization begins. This payment shock is the single biggest reason HELOC borrowers run into trouble.
Because the credit line is secured by your home, the consequences of falling behind are severe. The lender can restrict access to unused credit, accelerate the full balance, and ultimately pursue foreclosure. A second-mortgage foreclosure follows the same general process as a primary mortgage foreclosure: the lender accelerates the debt, provides notice, and eventually forces a sale if you can’t cure the default or negotiate a modification.
Repayment on Unsecured Personal Lines
Unsecured personal lines of credit work similarly in concept but differ in important ways. Many carry the same draw-period-then-repayment-period structure, with interest-only payments while borrowing and a shift to principal-plus-interest once the draw period closes. Terms tend to be shorter, rates are higher because no collateral backs the debt, and credit limits are smaller.
The upside is that no property is at risk if you default. The downside is that the lender’s recourse shifts to lawsuits and wage garnishment rather than foreclosure, and the higher rate means the cost of carrying a balance month to month adds up faster. If you hold both a HELOC and a personal line, prioritizing the higher-rate unsecured balance usually saves more in interest over time.
Fees That Add to What You Owe
Interest is the biggest cost of carrying a line of credit, but it isn’t the only one.
- Annual or maintenance fees. Some lenders charge a yearly fee just for keeping the line open, regardless of use. For credit card accounts, federal regulations prohibit charging a fee based solely on inactivity, and total fees for making credit available cannot exceed 25% of your initial credit limit during the first year.6Consumer Financial Protection Bureau. 12 CFR 1026.52 – Limitations on Fees
- Late payment fees. Missing the due date triggers a penalty charge, typically $25 to $40. Repeated late payments on credit card accounts can also trigger a penalty interest rate as high as 29.99%, which the issuer must review and potentially remove after six consecutive months of on-time payments.
- Early closure fees. Some HELOC lenders charge a termination fee if you pay off and close the account within the first two to five years. The fee may be a flat amount up to around $500 or a percentage of the balance. Your closing documents say whether one applies and when it expires.
- Transaction fees. Certain lines charge a small fee each time you draw funds, particularly for wire transfers or cash advances.
What Happens If You Stop Paying
Missing a payment triggers a cascade that gets worse the longer it continues. Most lenders report the delinquency to credit bureaus once a payment is 30 or more days late, and a single late mark stays on your credit report for seven years even after you bring the account current.
Secured Lines
Because a HELOC is tied to your property, the lender’s ultimate remedy is foreclosure. Before reaching that point, most lenders will try to work with you. They may offer to convert the balance into a fixed-rate loan, modify the repayment terms, or let you refinance. If negotiations fail and the balance is accelerated, the lender can file a foreclosure action on the second lien. Even if you’re current on your primary mortgage, the HELOC lender has an independent right to foreclose.
Unsecured Lines
Without collateral, the lender’s path to recovering money runs through the courts. After failed collection attempts, the lender or a debt collector can file a lawsuit. If they win a judgment, they can pursue wage garnishment, which under federal law is capped at 25% of your disposable earnings or the amount by which your weekly pay exceeds 30 times the federal minimum wage, whichever is less.7Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment Bank account levies are another post-judgment option. Certain income, including Social Security benefits, is generally exempt from garnishment.8Consumer Financial Protection Bureau. Can a Payday Lender Garnish My Bank Account or My Wages if I Dont Repay the Loan
Paying Off Your Balance Faster
The minimum payment is designed to keep your account in good standing, not to get you out of debt efficiently. A few straightforward strategies make a real difference.
The most effective approach is paying more than the minimum every month. Because extra dollars go to principal after interest is satisfied, even modest additional payments compound over time. Sending an extra $100 per month on a $15,000 balance at 8.5% can cut years off the payoff timeline and save thousands in interest. If your cash flow is uneven, make the extra payment whenever you have surplus funds rather than waiting for a set date.
Another tactic is timing your payments to reduce the average daily balance. Since interest compounds daily, making a payment mid-cycle rather than waiting until the due date lowers the balance that interest is calculated on for the remaining days. Two half-payments spread across the month will cost less in interest than one full payment at the end. Electronic transfers generally post within one to three business days, while mailed checks can take five to seven, so an electronic payment is the safer option when a due date is close.
If you’re carrying a large HELOC balance and approaching the end of the draw period, the worst thing you can do is ignore the transition. Contact your lender before the repayment period begins to understand exactly how your payment will change. Some lenders will let you lock a portion of the balance into a fixed rate, refinance the remaining balance into a new loan, or extend the draw period. Waiting until you’re already struggling with the higher amortized payment gives you far less negotiating leverage.