Line of Credit
Last reviewed: September 30, 2026
A line of credit is a flexible borrowing arrangement that lets you draw funds up to a set limit, repay, and usually borrow again. Interest is typically charged only on the outstanding balance. Home-equity lines and unsecured personal lines are common forms households encounter.
Reviewed September 2026
How a line of credit works
Unlike an installment loan with a fixed schedule for a lump sum, a line of credit is revolving within its limit during the draw period. You may write checks, use a card, or transfer funds to deposit accounts depending on the product. Minimum payments often cover interest plus a principal component; terms vary widely.
Lenders underwrite based on income, credit history, collateral (if any), and other debts. Limits can be cut and terms changed under conditions spelled out in the agreement—especially if your credit or home value changes.
Secured vs. unsecured lines
A home equity line of credit (HELOC) uses your home as collateral. Rates may be lower than unsecured debt, but your home is at risk if you default. Unsecured personal lines rely on your creditworthiness alone and usually cost more.
Business lines of credit finance working capital. They are underwritten on business cash flow and may require personal guarantees. This page focuses on the general consumer concept.
Simple example
You have a $40,000 line at a variable rate. You draw $10,000 for an emergency repair and pay interest on $10,000. After repaying $4,000, roughly $6,000 remains outstanding and about $34,000 of unused credit may be available again, subject to lender rules. If rates rise, your interest cost on the balance rises with a variable-rate line.
Smart uses and risky uses
A line of credit can be a backup for true emergencies if you lack cash reserves—or a bridge when a large expense is soon to be reimbursed. It is generally a poor substitute for long-term investing capital or for funding speculative trades. Using a HELOC to buy volatile assets creates leverage against your home.
Carrying high revolving balances at elevated rates can crowd out saving and investing. Compare the after-tax interest cost with the expected benefit of whatever the borrowed money funds.
Interaction with an investment plan
Build a cash emergency fund so you are not forced to draw a high-rate line—or sell investments at a bad time—for routine shocks. If you already hold a line, treat outstanding balances as debt in your household balance sheet when judging risk capacity.
Avoid confusing available credit with wealth. Unused credit is not an asset in the same way that invested capital is.
Interest rates, variable costs, and payment discipline
Many lines of credit use variable rates tied to a prime or other reference rate. When central-bank policy tightens, interest costs can rise quickly on outstanding balances. Stress-test your budget at a higher rate before drawing large amounts.
Interest-only payment periods can feel comfortable while balances stagnate. If your goal is to eliminate debt, set a principal payoff schedule. Treating a line like permanent free money is how balances become structural.
HELOC specifics in brief
Home equity lines often have a draw period followed by a repayment period when draws stop and payments rise. Property value declines can freeze or reduce limits. Closing costs, appraisal fees, and tax rules on interest deductibility vary; verify current rules rather than relying on old assumptions.
Using home equity to fund consumption or speculative investments layers housing risk on top of market risk. Conservative households usually reserve HELOCs for planned, bounded needs—not as portfolio leverage.
Connect debt decisions to investing math: high-interest revolving balances often dominate the “return” from staying invested. Paying down costly debt can be the highest risk-adjusted use of cash for a risk-averse household.
Credit utilization and future borrowing
Large draws can affect credit utilization metrics and future mortgage or refinance applications. If you plan a home purchase, ask how a maxed line might appear to underwriters. Keeping utilization modest and documenting the purpose of draws can reduce surprises.
Also separate mental accounts: a line of credit is not an emergency fund. Cash in the bank (or a Treasury bill ladder) spends without starting an interest meter. Build cash first; treat credit as backup.
Comparing a line of credit with other borrowing
Credit cards are revolving too but often at much higher rates—poor for large planned borrowing. Installment loans give payment certainty for a known purchase. Mortgages finance housing with long amortization. A line of credit sits in the middle: flexible, often variable-rate, useful when timing and amount of need are uncertain.
Pick the tool that matches the job. Do not refinance high-rate consumer debt into a HELOC casually without a payoff plan; you may lower the rate while extending risk against your home. Run the numbers, including how long until balances hit zero.
Investors should also avoid using credit to “not miss” a market rally. Leverage turns ordinary volatility into a potential forced sale. Patience and contributions beat borrowed urgency.