HELOC: Draw Period vs Repayment Period, With Real Numbers

What a HELOC actually is

A HELOC, or home equity line of credit, is a revolving line secured by your home. You draw what you need, repay, and can draw again during the draw period. It is not a fixed loan where you get one lump sum and start chipping away at the balance. It is closer to a credit card with a home-sized collateral behind it.

Phase one: the draw period

During the draw period, you can use the line, pay it down, and reuse it. The typical draw period on a home equity line is 5 or 10 years, but the mechanics stay the same: your required payment is usually interest-only.

The math is simple:

Monthly interest = current balance × APR ÷ 12

That is the amount the lender expects every month. It keeps the interest current, but it does not reduce the balance. If you only make the minimum payment, the principal sits right where it was. You can re-borrow what you repay, which makes it flexible, but the balance does not fall on its own.

Phase two: repayment

When the draw period ends, the line closes to new draws. You cannot pull more money out. The remaining balance is then amortized over the repayment term, usually 10 years, like a regular installment loan. Your payment now includes both interest and principal, and it is sized to bring the balance to zero by the end of the term.

This is the phase change that catches people. A payment that was interest-only can suddenly become a much larger fully amortizing payment, even if the interest rate does not move.

The default example: $20,000 at 8% APR

Here is the worked example from our HELOC Calculator. It uses a $20,000 draw at 8% APR, a 5-year draw period, and a 10-year repayment period. Every number below is reproducible in the calculator, because this example is its default.

During the draw phase, the interest-only payment is:

$20,000 × 0.08 ÷ 12 = $133.33 per month

Over 60 months, that is $8,000.00 of interest. You still owe the full $20,000 because nothing went toward principal.

Then the repayment phase begins. The payment becomes $242.66 a month. That is an 82% jump, and it adds $9,118.62 more interest.

Total interest across both phases: $17,118.62 on a $20,000 draw.

Why the payment jump surprises people

The jump is not a penalty. It is just what happens when a balance that was not shrinking suddenly has to be paid off over a fixed term. But minimum-payment framing hides it. When a HELOC statement shows a $133.33 payment, many borrowers feel like they are keeping up. They are technically current, but they are only paying rent on the money, not buying the debt down.

The lender is not lying. The minimum payment is exactly what the contract says. But a minimum interest-only payment can make a long-term debt look smaller than it is. The true cost only shows up in the second phase, when the full repayment payment arrives.

For comparison, if you borrowed the same $20,000 as a fixed amortizing loan from day one, the monthly payment would be higher than the draw-period minimum but lower than the surprise repayment jump. You can price that side-by-side using the Mortgage Calculator for a fixed-payment mortgage-style loan, or the APR Calculator for a plain fixed loan.

The smart-draw habit: pay extra principal during the draw

The single best way to soften the repayment shock is to pay extra principal while you are still in the draw period. Because the line is revolving, you can pay more than the minimum and still re-borrow if you truly need it. But if you do not re-borrow the extra principal, the balance falls, and the second phase becomes much easier.

Using the same $20,000, 8% APR, 5-year draw, 10-year repayment example, suppose you pay $100 a month of extra principal during the draw. That is $6,000 of principal over 60 months.

Here is what changes:

• The balance entering repayment is $14,000 instead of $20,000.
• The repayment payment drops to $169.86 a month.
• Total interest falls to $14,383.04.
• That is $2,735.59 less interest than the minimum-payment path.
• Plus, you paid down $6,000 of principal you would have owed anyway.

The HELOC Calculator prices both phases for any draw, rate, and terms, including extra principal during the draw. You can adjust the extra amount and see the second-phase payment fall in real time. The example above is the default, so every number is already loaded.

Two honest warnings before you rely on the numbers

First, the rate is usually variable. HELOC rates often move with a benchmark rate. A payment that looks fine at 8% may not look fine at 10%. Before you commit, re-run your numbers at least 2 percentage points higher. A higher rate changes both the draw-period interest and the repayment payment. If the plan only works at the starting rate, it is not a plan; it is a guess with your house attached.

Second, the collateral is your home. A HELOC is secured debt. If you cannot make the repayment-phase payment, the lender can move toward foreclosure. That is why the payment jump matters. The risk is not just a credit score drop. The risk is tied to the roof over your head.

None of this means a HELOC is bad. It means the numbers deserve more attention than the minimum-payment line on the statement. Run the full two-phase cost before you draw, and run it again with a higher rate.