HELOC Interest-Only Payment: What to Expect
Most HELOCs require interest-only payments during the draw period. Here’s how to calculate yours and understand the implications.
TL;DR: Interest-only HELOC payments keep your balance unchanged—$354/month on $50,000 at 8.5%. But this leads to payment shock when the draw period ends. Paying even $100-200 extra per month during draw period can reduce your repayment payment by 50-80%.
How Interest-Only Payments Work
During the draw period (typically 10 years):
- Minimum payment = Interest accrued that month
- Principal balance stays the same (if you pay only minimum)
- Formula: (Balance × Rate) ÷ 12
Interest-Only Payment Examples
| Balance | Rate | Monthly Interest-Only |
|---|---|---|
| $25,000 | 8.5% | $177 |
| $50,000 | 8.5% | $354 |
| $75,000 | 8.5% | $531 |
| $100,000 | 8.5% | $708 |
Pros of Interest-Only Payments
✓ Lower monthly payment during draw period ✓ Maximum flexibility ✓ Cash flow for other priorities ✓ Can pay extra when you want
Cons of Interest-Only Payments
✗ Balance doesn’t decrease ✗ Larger repayment phase payment ✗ More total interest paid ✗ Temptation to never pay principal
The Repayment Shock
After draw period, you must repay principal:
Example: $50,000 balance at 8.5%
- Draw period: $354/month (interest-only)
- Repayment period (20yr): $434/month
- Increase: +$80/month (+23%)
Worse case: Rate rises to 10.5%
- Repayment payment: $499/month
- Increase: +$145/month (+41%)
Our Calculator Shows Interest-Only
We display:
- HELOC interest-only monthly payment
- Combined with your current mortgage payment
- What happens in repayment phase
- How paying extra affects future payments
Strategy: Pay More Than Minimum
Even modest principal payments help:
| Extra Payment | Balance After 10yr | Repayment Payment |
|---|---|---|
| $0 (interest-only) | $50,000 | $434 |
| $100/month | ~$26,000 | ~$225 |
| $200/month | ~$9,000 | ~$75 |
Paying $200 extra during draw period cuts repayment payment by 83%!
When Interest-Only Makes Sense
✓ Short-term borrowing (1-3 years) ✓ Irregular income (pay extra when you can) ✓ Investment returns exceed HELOC rate ✓ You’ll sell or refinance before repayment
When to Avoid Interest-Only
✗ You won’t pay down principal ✗ Fixed budget (payment shock risk) ✗ Long-term borrowing (10+ years) ✗ Rate is expected to rise significantly
Frequently Asked Questions
How is HELOC interest-only payment calculated?
Divide your annual interest by 12: (Balance × Rate) ÷ 12. For example, $50,000 at 8.5% = ($50,000 × 0.085) ÷ 12 = $354/month. This keeps your principal balance unchanged.
Should I pay more than the interest-only minimum?
Yes, if you can afford it. Paying just $100-200 extra per month during the 10-year draw period can reduce your balance from $50,000 to under $10,000, cutting your repayment phase payment by 80%+.
What happens when the interest-only period ends?
Your HELOC enters the repayment phase (typically 20 years) where you must pay principal + interest. On $50,000 at 8.5%, payments jump from $354/month (interest-only) to $434/month—a 23% increase. Prepare for this shock.