How to Use This Calculator
- 1
Enter Current Balance
Input the total outstanding amount on your line of credit.
- 2
Enter Annual Interest Rate
Input the annual interest rate applied to your balance.
- 3
Enter Monthly Payment
Input the fixed amount you plan to pay each month toward the balance.
- 4
Optionally Expand Advanced Options
Set payments per year (default 12) and any additional payment amount beyond your regular payment.
- 5
Review Your Results
The calculator displays Payments to Pay Off, Total Interest Paid, and Total Amount Paid. The insights panel shows your first month's interest breakdown and the impact of adding extra payments.
Example Calculation
A borrower wants to pay off a $5,000 line of credit with a 6% annual interest rate by making $200 monthly payments.
Current Balance ($)
5,000
Annual Interest Rate (%)
6
Monthly Payment ($)
200
Results
Payments to Pay Off
27 payments
Total Interest Paid
$354.69
Total Amount Paid
$5,354.69
Tips
Add Extra Payments
Adding just $50/month to your $200 payment on a $5,000 balance at 6% cuts payoff from 27 to 22 months and saves $73.43 in interest.
Prioritize High-Interest Debt
If you have multiple debts, focus extra payments on the one with the highest interest rate first (debt avalanche method) to minimize total interest paid.
Avoid New Draws
To accelerate your payoff, avoid making new draws on your line of credit while paying it down. Each new charge extends the repayment period and increases total interest.
Check Your First Payment Split
On a $5,000 balance at 6%, your first month's interest is only $25 (13% of a $200 payment) — meaning 87% goes to principal. Lower rates mean faster payoff.
The Line of Credit Payoff Calculator projects how long it will take to pay off your revolving credit balance and how much interest you will pay along the way.
For a $5,000 balance at 6% annual interest with $200 monthly payments, it takes 27 payments (2.3 years) and costs $354.69 in total interest.
Accelerating Debt Freedom with Strategic Payments
Managing your line of credit payoff strategically is crucial to minimizing interest costs.
Even modest extra payments can make a significant difference.
For example, adding $50/month to a $200 payment on a $5,000 balance at 6% saves $73.43 in interest and eliminates the debt 5 months sooner.
This proactive approach to debt reduction helps borrowers achieve financial goals faster and maintain healthier credit profiles.
The Payoff Formula
The calculator simulates your payoff month by month, calculating interest on the remaining balance each period:
Monthly Interest = Remaining Balance x (Annual Rate / Payments Per Year)
Principal Paid = Monthly Payment + Additional Payment - Monthly Interest
New Balance = Remaining Balance - Principal Paid
The process repeats until the balance reaches zero.
Key metrics:
Total Interest = Sum of all monthly interest charges
Total Amount Paid = Original Balance + Total Interest
This month-by-month simulation is more accurate than the standard loan formula because it properly handles the final partial payment.
Worked Example: Paying Off a $5,000 Line of Credit
A borrower has a $5,000 balance at 6% annual interest and makes $200 monthly payments with no additional payments.
Step-by-step:
- Monthly interest rate: 6% / 12 = 0.5% (0.005).
- Month 1: Interest = $5,000 x 0.005 = $25.00. Principal = $200 - $25 = $175. Balance = $4,825.
- Month 2: Interest = $4,825 x 0.005 = $24.13. Principal = $175.88. Balance = $4,649.13.
- This continues for 27 months until the balance is fully paid.
Results:
- Payments to Pay Off: 27 payments (2.3 years)
- Total Interest Paid: $354.69
- Total Amount Paid: $5,354.69
The interest represents just 6.6% of the total amount paid — at 6% interest with aggressive payments, most of your money goes to principal.
Understanding How Payments Split Between Interest and Principal
In the early months, a larger portion of each payment goes to interest.
For the $5,000 example at 6%, the first month sends $25 (13%) to interest and $175 (87%) to principal.
As the balance decreases, the interest portion shrinks — by the final months, nearly 100% of each payment goes to principal.
This is why early extra payments have the greatest impact on total interest savings.
Regulatory Considerations for Lines of Credit
Lines of credit, particularly consumer-facing products like home equity lines of credit (HELOCs) and personal lines of credit, are subject to regulatory oversight under the Truth in Lending Act (TILA).
Financial institutions must clearly disclose interest rates, fees, and repayment terms.
The Consumer Financial Protection Bureau (CFPB) monitors the market to prevent deceptive practices.
For HELOCs, specific rules govern interest rate changes and cancellation policies, with lenders required to provide accurate information on variable rates and potential payment increases in the current 2026 market.
Frequently Asked Questions
What is a line of credit (LOC)?
A line of credit is a flexible loan that lets you borrow up to a set limit, draw funds as needed, and only pay interest on the amount borrowed. As you repay principal, the available credit replenishes. This makes it useful for managing cash flow, unexpected expenses, or consolidating higher-interest debts.
How does interest work on a line of credit?
Interest on a line of credit is typically calculated on the outstanding balance. For a $5,000 balance at 6% annual interest, the monthly interest charge is $25 (6% / 12 x $5,000). As you pay down the balance, the interest charge decreases each month.
Can I make extra payments on a line of credit?
Yes, extra payments go directly toward reducing your principal balance. On a $5,000 balance at 6%, adding $50/month to a $200 payment saves $73.43 in total interest and cuts the payoff timeline from 27 months to 22 months.
What happens if my payment doesn't cover the interest?
If your monthly payment is less than the interest charge, your balance will grow instead of shrinking. For example, a $5,000 balance at 6% charges $25/month in interest — any payment below $25 would cause the balance to increase. The calculator will warn you if this occurs.
What is the difference between a line of credit and a credit card?
Both are revolving credit, but a line of credit typically offers larger limits and lower interest rates (often 5-10%) compared to credit cards (15-25%). LOCs may require collateral (like home equity) and have more stringent application requirements, while credit cards are unsecured and designed for everyday purchases.