Will my HELOC payment go up when the draw period ends? Yes — often significantly. Because most HELOCs only require interest during the draw period, your payment is artificially low for years. Once the repayment period starts and you begin paying down principal too, the payment can jump 40% to 70% or more overnight, even with no change in interest rate. Below is the exact math on three common HELOC sizes.
Why does the payment jump so much?
During the draw period, your required payment is just balance × interest rate ÷ 12 — pure interest, no principal reduction. When repayment begins, the lender switches you to a normal amortizing payment that has to pay off the entire remaining balance within whatever years are left, which is a fundamentally bigger monthly obligation.
Example: $50,000 HELOC balance at 9% APR
With a 10-year draw period followed by a 10-year repayment period, this is what changes:
| Phase | Monthly Payment | What It Covers |
|---|---|---|
| Draw period (interest-only) | $375 | Interest only — balance stays at $50,000 |
| Repayment period (10 yrs) | $633 | Principal + interest — balance actually shrinks |
That’s a 69% increase in the required monthly payment — with the interest rate never changing. If the repayment period is shorter (say, 5 years instead of 10), the new payment jumps to roughly $1,038/month — nearly 3x the draw-period payment.
How much interest do you pay before the balance even starts shrinking?
On that same $50,000 balance, a full 10-year interest-only draw period means paying about $45,000 in interest — almost the entire original balance — before a single dollar of principal is repaid. That’s not a hidden fee or a bad deal necessarily; it’s simply how interest-only borrowing works. But it’s a number a lot of HELOC borrowers don’t see coming.
How can you avoid the payment shock?
- Pay extra toward principal during the draw period, even though it’s not required — every dollar you pay down early reduces both the eventual repayment-period payment and the total interest.
- Model your specific numbers before you borrow, not after — the size of the jump depends heavily on your draw and repayment period lengths, which vary by lender.
- Compare a HELOC against a fixed home equity loan or a cash-out refinance if predictable payments matter more to you than flexibility.
Frequently Asked Questions
Does every HELOC have an interest-only draw period?
Most do, but not all — some lenders require principal and interest from day one. Check your specific loan terms rather than assuming.
Can I pay off a HELOC early to avoid the jump?
Yes — voluntary principal payments during the draw period reduce your balance, which lowers both your future repayment-period payment and your total interest paid.
Where can I see this calculated for my own HELOC?
Use the HELOC Calculator to enter your actual balance, rate, and draw/repayment periods and see your specific payment jump and total interest cost.
All figures above were calculated using standard interest-only and amortizing loan formulas. HELOC rates are typically variable, so actual future payments may differ from this estimate.