A credit line, also called a line of credit, is a borrowing arrangement that gives you access to a set pool of money you can draw from, repay, and reuse on your own schedule, up to an approved limit. Unlike a traditional loan that pays out a lump sum, a credit line charges interest only on the portion you actually borrow. You can tap it once, ignore it for months, then borrow again — all without submitting a new application.
How the Revolving Structure Works
Every credit line has the same basic mechanic. Your lender approves you for a maximum amount, your credit limit, and you can borrow any portion of it at any time. When you take money out, your available balance drops by that amount. When you pay it back, your available balance goes back up. This cycle repeats for as long as the account stays open and in good standing.
Say your limit is $10,000 and you borrow $2,000. You have $8,000 left to draw. Once you repay the $2,000, the full $10,000 is available again. Federal law calls this an “open-end credit plan,” meaning the lender expects repeated transactions and charges interest on whatever balance remains unpaid.1Office of the Law Revision Counsel. 15 U.S. Code 1637 – Open End Consumer Credit Plans
A traditional installment loan works differently. It delivers the entire principal on day one, charges interest on the full amount, and sets a fixed monthly payment until the balance reaches zero. Then the account closes. A credit line stays open, and your payment adjusts to reflect what you currently owe rather than a rigid amount.
Common Types of Credit Lines
The type that fits you depends on whether you can offer collateral, how much you need, and what you plan to do with the money.
- Credit cards are the most familiar revolving credit line. You make purchases up to your limit, receive a monthly statement, and pay interest on any balance carried past the grace period. No collateral is required.
- Personal lines of credit work much like credit cards but are usually accessed by transferring funds into a bank account rather than swiping. Rates can be lower than credit card rates, and most are unsecured, though some lenders will accept a savings account or certificate of deposit as collateral.
- Home equity lines of credit, or HELOCs, are secured by the equity in your home. A HELOC has two phases: a draw period, typically five to ten years, when you can borrow and often make interest-only payments, followed by a repayment period, often ten to twenty years, when you pay back principal and interest and can no longer draw funds.2Consumer Financial Protection Bureau. What Is a Home Equity Line of Credit (HELOC)?
- Business lines of credit give companies flexible working capital for irregular expenses like inventory or seasonal payroll. These can be secured or unsecured.
- Overdraft lines of credit link to a checking account and automatically cover transactions when the balance falls short, helping you avoid bounced-check fees.
The draw-and-repayment phase structure is specific to HELOCs and some business lines. Credit cards and personal lines of credit generally stay open indefinitely without shifting into a separate repayment phase, as long as the account remains in good standing.
Secured vs. Unsecured
The most important split among credit lines is whether collateral backs the debt.
Secured Lines
A secured credit line requires you to pledge an asset, most often home equity, but sometimes a savings account, certificate of deposit, or investment portfolio. If you stop making payments, the lender can seize that asset. For a HELOC, that means foreclosure on your home. Because the collateral reduces the lender’s risk, secured lines usually offer lower rates and higher limits.
Unsecured Lines
An unsecured credit line requires no collateral. The lender relies entirely on your creditworthiness: credit score, income, and existing debts. Qualification standards tend to be stricter, and many lenders look for a credit score of 680 or higher for an unsecured personal line. Rates are higher and limits are lower, because the lender has no property to claim if you default. If you fall behind, the lender’s main options are sending the debt to collections or filing a civil lawsuit for a judgment.
Interest Rates and Fees
Most credit lines carry a variable interest rate that moves with a benchmark, typically the prime rate. Your lender adds a fixed margin on top of that benchmark, and the two together form your actual rate. As of early 2026, the national average HELOC rate is roughly 7.3%, with individual rates ranging widely based on credit profile and lender.
For home equity lines, federal law requires the lender to cap how high your rate can climb. Every HELOC agreement must state a lifetime maximum rate, and the lender must disclose that ceiling before you sign.3Office of the Law Revision Counsel. 15 U.S. Code 1637a – Disclosure Requirements for Open End Consumer Credit Plans Secured by Consumer’s Principal Dwelling Lifetime caps typically fall between 18% and 25%.
Beyond interest, watch for annual or maintenance fees just for keeping the account open, inactivity fees if you go a set period without borrowing, per-transaction fees each time you draw, and, for HELOCs, closing costs that cover appraisal, title search, and recording.
How a Credit Line Affects Your Credit Score
Opening a new credit line triggers a hard inquiry on your credit report, which can temporarily lower your score. Hard inquiries stay on your report for two years but generally affect the score for only about one year.
The bigger ongoing factor is your credit utilization ratio, the percentage of your available credit you are actually using. Utilization accounts for roughly 20% to 30% of your credit score, depending on the scoring model. Using more than about 30% of your available credit tends to drag your score down noticeably. Keeping utilization in the single digits is associated with the highest scores.
Over time, a credit line can help your score by increasing your total available credit and adding positive payment history. It can hurt your score if you carry a high balance relative to your limit or miss payments.
When a Lender Can Freeze or Reduce Your Line
Your credit line is not guaranteed to stay at its original limit for the life of the account. For HELOCs, federal law spells out specific situations in which a lender can suspend borrowing or cut the limit:4Office of the Law Revision Counsel. 15 U.S. Code 1647 – Home Equity Plans
- Your property value drops significantly below the appraised value at the time you opened the line.
- The lender has reason to believe you can no longer afford the repayment obligations, for example due to job loss or a large increase in other debts.
- You miss payments or violate another material term of the contract.
- A regulatory change prevents the lender from charging the agreed-upon rate or undermines the priority of its lien.
Lenders must disclose these possibilities upfront, and they are required to restore your credit privileges once the triggering condition no longer applies.5Consumer Financial Protection Bureau. Regulation Z – 1026.40 Requirements for Home Equity Plans For unsecured lines like credit cards and personal lines, lenders generally have broader discretion to adjust limits based on periodic reviews of your creditworthiness, since those accounts are governed by the terms of your card or loan agreement rather than the home-equity statute.
Legal Protections Before You Sign
The Truth in Lending Act requires lenders to disclose key terms before you open any open-end credit account, including how interest is calculated, what fees may apply, and whether the account is secured by your property.1Office of the Law Revision Counsel. 15 U.S. Code 1637 – Open End Consumer Credit Plans For home equity lines, the required disclosures go further. The lender must explain how the variable rate works, identify the index and margin, state the maximum rate that could ever apply, and show how rate changes would affect your payments.3Office of the Law Revision Counsel. 15 U.S. Code 1637a – Disclosure Requirements for Open End Consumer Credit Plans Secured by Consumer’s Principal Dwelling
If you open a credit line secured by your primary home, you also have a three-business-day window to cancel the agreement for any reason. This right of rescission runs until midnight of the third business day after you sign the contract or receive the required disclosures, whichever is later.6eCFR. 12 CFR 226.23 – Right of Rescission During this cooling-off period, the lender cannot release funds other than into an escrow account. You cancel by sending written notice. If the lender failed to provide the required disclosures at all, the cancellation window extends to three years.
A Note on HELOC Interest and Taxes
HELOC interest is not automatically tax-deductible. It qualifies only if you used the borrowed money to buy, build, or substantially improve the home that secures the line. Interest on HELOC funds spent on credit card payoffs, tuition, or a vacation is not deductible.7Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction
Even when the funds qualify, a cap applies. You can deduct interest on up to $750,000 of total home acquisition debt ($375,000 if married filing separately) for loans taken out after December 15, 2017. Loans secured before that date fall under a higher $1 million limit ($500,000 if married filing separately).7Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction The cap applies to the combined total of your mortgage and any home equity borrowing, not to each loan separately. If your primary mortgage already uses most of the $750,000 cap, the deductible portion of your HELOC interest may be limited or zero.