HELOC Payoff Calculator

Updated Aug 31, 2026 By Jehan Wadia

Introduction

A HELOC, or home equity line of credit, lets you borrow against the value of your home. Most HELOCs have a variable rate, so your cost can change over time. This HELOC payoff calculator shows you how long it will take to clear your balance and how much interest you will pay along the way.

You can use it two ways. Pick a payoff goal in years, and the tool tells you the monthly payment you need. Or enter the monthly payment you can afford, and it tells you how long the payoff will take. You can also add extra principal payments and any lender fees.

After you hit calculate, you get:

Your monthly payment or payoff date
Total interest and total amount paid
Interest cost for every $1.00 of principal
Time and money saved from extra payments
A step-by-step math breakdown
A rate stress test if rates rise 1%, 2%, or 3%
A balance chart and full amortization schedule

Not sure what rate to use? Open the Current HELOC Rates tab to see typical APRs by credit score and loan-to-value, then apply one with a single click.

How to use our HELOC Payoff Calculator

Enter your HELOC balance, your rate, and either a payoff goal or a monthly payment. The calculator shows your payment or payoff date, total interest, total cost with fees, a step-by-step solution, a payoff chart, and a full amortization schedule.

Calculation Mode: Pick "Payoff Goal" to find the monthly payment you need. Pick "Minimum Repayment" to find how long a set payment will take.

Current Balance: Type what you owe on your HELOC right now, not the full credit line or the first loan amount.

Annual Percentage Rate (APR): Type your HELOC rate as a percent. If you don't know it, open the "Current HELOC Rates" tab and click "Use" on the row that fits your credit score and loan-to-value.

Payoff Goal (Years): In Payoff Goal mode, choose how many years you want to take to clear the balance. You can pick 1 to 30 years.

Monthly Payment Amount: In Minimum Repayment mode, type the amount you plan to pay each month. It must be more than the interest-only amount, or the balance will never drop.

Additional Principal Payment: Type any extra money you can add each month. This goes straight to principal and shows how many months and how much interest you save. Leave it at 0 if you don't pay extra.

Fees / Recurring Charges: Type any yearly or monthly HELOC fee, then pick "per year" or "per month" from the drop-down. This is added to your total cost.

Click Calculate to see your results, or Reset to start over with the default numbers.

What Is a HELOC Payoff?

A HELOC is a home equity line of credit. It lets you borrow money against the value of your home, kind of like a credit card tied to your house. Paying off a HELOC means paying back everything you borrowed, plus interest, until the balance hits zero.

How a HELOC Works

Most HELOCs have two parts:

Draw period (usually 5 to 10 years): You can borrow money as you need it. Many lenders only make you pay the interest during this time. Your balance does not go down.
Repayment period (usually 10 to 20 years): You can no longer borrow. Now you pay back principal and interest, so your payment jumps up.

That jump surprises a lot of people. Planning your payoff early is the best way to avoid it, and it helps to check your debt-to-income ratio before the higher payment starts.

Interest-Only Payments and the "Floor"

Each month, interest is charged on the balance you still owe. Take your balance, multiply by your rate, and divide by 12. That is your interest-only floor. If you pay only that much, you will owe the same amount forever. Every dollar you pay above the floor goes to principal and shrinks your debt.

Why HELOC Rates Move

Most HELOCs have a variable rate. The rate is usually tied to the prime rate plus a margin set by your lender. When prime goes up, your rate and your payment can go up too. This is why it helps to test what happens if your rate rises by 1%, 2%, or 3%.

What Changes Your Payoff Cost

Balance: More owed means more interest.
APR: A higher rate adds cost every single month.
Payoff time: A shorter term means a bigger monthly payment but far less total interest.
Extra principal: Even $50 or $100 a month can cut years off your loan and save thousands in interest.
Fees: Some lenders charge annual fees, maintenance fees, or inactivity fees. These add up over a long term.

How to Pay Off a HELOC Faster

Pay more than the minimum every month, and make sure the extra goes to principal.
Stop drawing new money from the line.
Put tax refunds, bonuses, or raises toward the balance.
Start paying principal during the draw period instead of waiting.
Ask your lender about locking part of the balance into a fixed rate if rates are climbing.

Things to Watch Out For

A HELOC is secured by your home. If you do not pay, you risk foreclosure. Also check your loan papers for a prepayment penalty or an early closing fee. Most HELOCs do not have one, but some charge a fee if you close the line in the first few years.

Formulas used

Monthly interest rate from APR

r = \frac{\text{APR}\%}{100 \times 12}

Required monthly payment (payoff goal mode)

M = P \cdot \frac{r(1+r)^n}{(1+r)^n - 1}, \quad n = \text{years} \times 12

Number of payments (minimum repayment mode)

n = \frac{-\ln\left(1 - \dfrac{P \cdot r}{M}\right)}{\ln(1+r)}

Monthly amortization (interest, principal, balance)

I_k = B_{k-1} \cdot r, \quad \text{Prin}_k = M - I_k, \quad B_k = B_{k-1} - \text{Prin}_k

Total interest paid

I_{\text{total}} = \text{Total Paid} - P = \sum_{k=1}^{n} B_{k-1} \cdot r

Interest-to-principal ratio

\text{Ratio} = \frac{I_{\text{total}}}{P}

Fees over the term and total cost

F = f_{\text{monthly}} \times n, \quad f_{\text{monthly}} = \frac{f_{\text{annual}}}{12}, \quad \text{Total Cost} = \text{Total Paid} + F

Interest-only payment floor

M_{\text{IO}} = P \cdot r

Frequently asked questions

Why is the last payment in the schedule smaller than the rest?

The final payment is trimmed to clear only what is left. If your regular payment is more than the leftover balance plus interest, you just pay the smaller amount. That is why total paid may be a few dollars less than payment times months.

What does "Interest per $1.00 of Principal" mean?

It shows how much interest you pay for each dollar you borrowed. If it says $0.48, you pay 48 cents of interest for every $1.00 of your balance. A lower number means a cheaper payoff. Shorter terms and lower rates push this number down.

What does the variable rate stress test show me?

It repeats your math at your current rate plus 1%, 2%, and 3%. In Payoff Goal mode it shows how much your payment would rise. In Minimum Repayment mode it shows how many extra months and dollars a rate hike would cost you, since your payment stays the same.

Can I use this during my draw period?

Yes. Enter what you owe today and the payment you plan to make. The tool treats your balance like a fixed loan being paid down. If you keep drawing new money, your real payoff will take longer, so run it again after each draw.

Where do I find my current HELOC balance and APR?

Both are on your monthly statement or in your lender's online account. Use the current balance, not your credit limit. If your statement lists a daily or periodic rate, use the APR figure instead.

Is the extra principal payment added every month?

Yes. The tool adds it to every payment until the balance hits zero. If you only plan to pay extra now and then, enter a smaller monthly average instead so the results stay realistic.

Which payment does the amortization schedule use?

If you entered an extra principal amount, the schedule uses your payment plus the extra. If not, it uses the base payment. The note above the table tells you which one is being shown.

Why did my payment go up even though I did not borrow more?

Two common reasons. Your rate rose because prime went up, or your draw period ended and you moved into the repayment period, where you now pay principal plus interest. The second change is usually the bigger jump.

Should I enter property taxes or home insurance?

No. A HELOC payment does not include escrow items. Those are usually part of your first mortgage payment. Enter only your HELOC balance, rate, payment, and any lender fees.

What happens if I make a big one-time payment?

Subtract that amount from your balance and run the numbers again. The new results show your shorter payoff and lower interest. For steady extra payments, use the additional principal field instead.

Why does a longer payoff term cost so much more?

Interest is charged on the balance you still owe. Stretching the payoff keeps that balance high for more years, so you pay interest many more times. Cutting the term raises your monthly payment but can save thousands overall.

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