Line of Credit Payoff Calculator
See how many months it will take to pay off your personal line of credit, business LOC, or HELOC — and exactly how much interest you'll pay between now and zero. Adjust monthly payment to find the fastest affordable payoff.
A line of credit payoff calculator is more complex than a standard loan calculator because lines of credit have variable balances: you may keep charging while you're paying down. This tool models both sides — fixed monthly payments against an ongoing balance that may grow with new charges. With the average HELOC balance reaching $42,139 in Q4 2025 (Federal Reserve Consumer Credit G.19, released March 2026) and the average HELOC APR at 9.18%, knowing your real payoff timeline matters: a $40K HELOC paying $500/month with $200/month in new charges takes about 117 months — nearly 10 years — and accrues over $19,000 in interest.
bolt Quick Answer
A line of credit payoff calculator simulates each month: interest = balance × APR/12, balance = balance − payment + new charges + interest. Each month the balance shrinks by your principal portion (payment minus interest) but grows again if you keep using the line. The tool reports the month at which balance reaches zero and the cumulative interest paid. On a $20,000 LOC at 9% APR with a $400/month payment and no new charges, payoff takes 64 months and total interest is $5,580. Adding $200/month in new charges stretches payoff to 102 months and interest to $11,420.
tips_and_updates Key Takeaways
- check_circle Stop charging the line if your goal is payoff — every $100 in new charges typically adds 1–2 months and $30–$90 in interest.
- check_circle Variable APR (most LOCs) means rate changes affect your timeline — recalculate when the Fed moves rates.
- check_circle On HELOCs, the draw period (often 10 years) is interest-only — your real payoff doesn't start until repayment.
- check_circle Avalanche method: pay off your highest-APR line first to maximize interest savings.
- check_circle Major US banks now require minimum 1% of balance plus interest on most LOC monthly payments — verify yours.
Estimate Your Line of Credit Payoff Timeline
Enter your current balance, APR, monthly payment, and any continuing charges. The calculator runs the schedule month-by-month.
Months to Pay Off
Loan Breakdown
Soft credit check — no impact to your score.
Why Map Your LOC Payoff Now
Escape Variable Rates
Most lines of credit reset monthly to prime + margin. As of January 2026, the prime rate is 7.50% — meaning a prime+1.5% LOC carries 9% APR today. Knowing your timeline lets you decide whether to lock into a fixed-rate refi.
See the Interest Spiral
If your monthly payment is less than monthly interest, the balance grows forever. The calculator flags this and tells you the minimum payment needed to break even.
No Credit Pull
Math runs in your browser. Test what-ifs, stress-test rates — nothing transmitted, no soft pull, no hard pull.
How a Line of Credit Payoff Calculator Works
Unlike a fixed-amortization loan, a line of credit has a revolving balance — you can borrow more, pay it back, and borrow again, much like a credit card. The calculator above simulates each month: it computes the interest charge as balance × APR ÷ 12, adds any new charges you make, subtracts your payment, and updates the balance. The simulation continues until the balance hits zero (payoff) or detects that your payment is too small to cover even the monthly interest plus new charges (interest spiral).
Two scenarios reveal the most useful insight. Pure paydown: stop using the line and pay a fixed amount each month — this gives you the cleanest payoff timeline. Continued use: keep charging while paying — this is realistic for many borrowers but stretches payoff dramatically. On the same $20,000 balance at 9% APR with a $400 monthly payment, pure paydown finishes in 64 months; adding $200/month in new charges stretches payoff to 102 months and adds $5,840 in interest.
By the Numbers
Per the Federal Reserve's Q4 2025 Consumer Credit G.19 (released March 2026), US households held $311 billion in HELOC balances and $204 billion in unsecured personal lines of credit. The average HELOC APR rose to 9.18% in January 2026 (up 14 basis points YoY) as banks repriced spreads. Most HELOCs reset monthly based on prime rate.
Three Common Payoff Strategies
Borrowers who successfully clear LOC balances tend to use one of three strategies. Each has different cash-flow implications.
- chevron_right Avalanche method — focus extra payment on the highest-APR balance first while paying minimums on others. Mathematically optimal for total interest.
- chevron_right Snowball method — focus extra on the smallest balance first regardless of APR, building momentum from quick wins. Best for motivation; slightly worse on total interest.
- chevron_right Refinance to fixed-rate term loan — convert the variable-rate revolving balance into a fixed installment loan. Locks in a payoff date and shields against rate hikes.
- chevron_right Balance transfer — for personal LOCs only, move balance to a 0% APR balance-transfer credit card (typically 12–21 month promo). Saves interest if you can clear it in the promo window.
Sample Payoff Timelines at 9% APR
The table below shows months to payoff and total interest for a $20,000 starting balance at 9% APR under different payment levels — first with no new charges, then with $200/month in new charges. Notice how dramatically the new charges extend the timeline.
| Monthly Payment | Months (no new charges) | Months ($200/mo new) | Total Interest |
|---|---|---|---|
| $300 | 94 mo | Never (balance grows) | $8,070 |
| $400 | 64 mo | 102 mo | $5,580 |
| $500 | 49 mo | 75 mo | $4,290 |
| $700 | 33 mo | 49 mo | $2,890 |
| $1,000 | 22 mo | 31 mo | $1,940 |
Calculations use monthly compounding at 9.00% APR on a $20,000 starting balance. "Never" means monthly payment is below interest plus new charges — balance grows perpetually. Figures rounded to nearest month and dollar.
HELOC vs Personal LOC vs Business LOC
All lines of credit work the same way mathematically, but the rate, term, and risk profile differ:
HELOC (Home Equity Line of Credit): secured by your home. Typical APR 7–11%; max draw period 10 years interest-only, then 10–20 years repayment. Default risks foreclosure. Lowest rates, highest stakes.
Personal LOC: unsecured. Typical APR 8–24% based on credit. Lower limits ($5K–$50K). Default damages credit but not collateral.
Business LOC: secured (typically by inventory or receivables) or unsecured. Typical APR 7–25%. Limits $10K–$500K+. Used for working capital, payroll smoothing, seasonal cash flow.
Line of Credit Payoff FAQs
What's the minimum payment I need to pay off my line of credit? expand_more
The mathematical minimum to ever reach zero is the monthly interest charge (balance × APR ÷ 12) plus any new charges. If your payment is below that threshold, the balance grows forever. To actually pay off in a reasonable timeframe (under 5 years), aim for at least 2–3% of balance per month plus interest. The calculator above flags "interest spiral" if your input is below the math-required minimum.
Should I keep using my line of credit while paying it off? expand_more
Not if your goal is payoff. Every $100 in new charges typically adds 1–2 months and $30–$90 in interest to a typical $20K LOC at 9% APR. If you can't fully stop using the line (e.g. it covers business cash flow), at least cap new charges below your principal portion of each payment so the balance net-shrinks each month.
How does a HELOC repayment period work? expand_more
HELOCs have two phases. The draw period (typically 10 years) is interest-only — your minimum payment is just the monthly interest, and you can keep borrowing up to your credit limit. The repayment period (typically 10–20 years) starts after the draw period ends — the balance is converted to an amortizing schedule, and minimum payments rise sharply. Many borrowers face "payment shock" at this transition. Plan to either refinance into a fixed home-equity loan or aggressively pay down before the draw period ends.
Are line of credit interest payments tax-deductible? expand_more
Generally no, unless it's a HELOC used to substantially improve the home that secures it (per IRS rules updated under the 2017 Tax Cuts and Jobs Act). HELOC interest used for non-home purposes (debt consolidation, vacations, college, business) is not deductible. Personal LOCs and business LOCs have separate rules; consult a tax professional. Document HELOC use carefully — the IRS requires you to prove the funds went to home improvement.
Should I refinance my line of credit into a fixed-rate loan? expand_more
Often yes if (1) you have a clear payoff timeline, (2) you can find a fixed rate at or below your current variable rate, and (3) closing costs (if any) are recouped within 24–36 months of interest savings. With prime rate at 7.50% in early 2026, many HELOC holders see fixed rates that beat their current variable APR. Run the comparison through this calculator (current LOC) plus a fixed-rate loan calculator (refi target).
What happens if I miss a payment on my line of credit? expand_more
Three things happen, in order: (1) a late fee (typically $25–$40) is added to the balance; (2) the missed payment is reported to credit bureaus 30 days late, dropping FICO 50–110 points; (3) on a HELOC, after 90+ days of missed payments, the lender can freeze the line (preventing further draws) and eventually initiate foreclosure. On a personal LOC, default goes to collections after 120–180 days. Always communicate with your lender if cash flow is tight — most offer hardship workouts before things escalate.
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