HELOC Payment Calculator
Estimate your current interest-only payment during the draw period, the fully-amortizing payment once repayment begins, and the payment shock in dollars and percent. Enter your outstanding balance and either a combined APR or the index rate plus your lender margin to see what a rising rate does to each payment.
🏦Choose a Rate Method
📌Real HELOC Scenarios
📝HELOC Details
The current amount drawn and owed on the line.
Total approved line; used for the utilization figure.
Your all-in variable rate for the line.
Benchmark your rate floats on, such as Prime.
Fixed spread the lender adds on top of the index.
Years you can still pay interest only, for context.
Years to amortize the balance once repayment starts.
Controls how payment amounts are displayed.
🔢Formula Snapshot
💵Interest-Only Payment by Balance and APR
| Balance | APR 6.5% | APR 7.5% | APR 8.5% | APR 9.5% |
|---|---|---|---|---|
| $25,000 | $135 | $156 | $177 | $198 |
| $50,000 | $271 | $313 | $354 | $396 |
| $75,000 | $406 | $469 | $531 | $594 |
| $100,000 | $542 | $625 | $708 | $792 |
| $125,000 | $677 | $781 | $885 | $990 |
| $150,000 | $813 | $938 | $1,063 | $1,188 |
| $200,000 | $1,083 | $1,250 | $1,417 | $1,583 |
📈Amortized Repayment Payment on $50,000
| APR | 10-Year Term | 15-Year Term | 20-Year Term | IO Payment |
|---|---|---|---|---|
| 6.5% | $568 | $436 | $373 | $271 |
| 7.5% | $594 | $464 | $403 | $313 |
| 8.5% | $620 | $492 | $434 | $354 |
| 9.5% | $647 | $522 | $466 | $396 |
| 10.5% | $675 | $553 | $499 | $438 |
| 11.5% | $703 | $584 | $533 | $479 |
📊Payment Shock Comparison Grid
| Balance | APR | IO Payment | Amort 20yr | Shock $ | Shock % |
|---|---|---|---|---|---|
| $25,000 | 7.5% | $156 | $201 | $45 | +29% |
| $50,000 | 7.5% | $313 | $403 | $90 | +29% |
| $50,000 | 9.5% | $396 | $466 | $70 | +18% |
| $75,000 | 8.5% | $531 | $651 | $120 | +23% |
| $100,000 | 7.5% | $625 | $806 | $181 | +29% |
| $100,000 | 9.5% | $792 | $932 | $140 | +18% |
| $125,000 | 8.5% | $885 | $1,085 | $200 | +23% |
| $150,000 | 7.5% | $938 | $1,208 | $270 | +29% |
| $150,000 | 10.5% | $1,313 | $1,497 | $184 | +14% |
| $200,000 | 8.5% | $1,417 | $1,736 | $319 | +23% |
⚙Formula Breakdown
💡HELOC Payment Tips
Regarding the HELOC, they say, “I’m remodeling my kitchen. I’ll take out some home equity. Monthly payments look reasonable. Whew!” Later: “Oops, now it’s time to pay off this loan! Now I owe almost 30% more each month.” Most homeowners is trapped by their own HELOC. Their situation didn’t change; the math just changed.
The calculator above give you all three figures simultaneously. It tells you what you’re paying now (your interest-only payment). It tells you what you’ll be paying later (the full-fledged payment, spread over many years). It computes the dollar and percent impact of the change, exactly how much you’ll be shocked. See how that changing interest rate affect your budget without having to wait for invoice.
Understanding HELOC Payments and Shock
Your home secures the HELOC (home equity line of credit), a type of revolving line that operates more like a credit card; except with steeper consequences. This loan has two phase. One is the draw period, lasting between five and 10 years. This is when you may borrows what you need, whenever you need it, then repay as desired. Generally, you only pay accumulated interest. The other life are the repayment period. This is when the draw window shut, and you must pay back both principal and interest. To avoid being surprised down the road, know its two sides.
How much? And how often? Most HELOCs is indexed to a publicly known benchmark, typically the Prime Rate. Your bank then tacks on fixed margin above that benchmark. Add it up and you get your APR. When Prime goes up, so does your bill. Right away. Not when your rate review comes around again. Which is why you should of test this uncertainty in your budget: What’s the impact if rates increase by two or three points over today’s rates?
In the draw phase, an interest-only payment is easy math: Balance x Monthly Rate. The Monthly Rate is the APR/12. At seven and a half percent on a fifty thousand dollar balance, that works out to around three hundred thirteen bucks a month. That’s enough to stay current but not reduce principal.
The amortizing payment isn’t the same. It applies the normal loan formula, which repays the full balance during life of the loan. With that same balance over a twenty-year period, the payment rise to four hundred three dollars a month. Now you’re paying down principal. That’s what we call payment shock: that gap between those two payments. When you start repaying, there’s a leap in your budget. Here, the jump is almost thirty percent, an extra ninety bucks. The bigger your balance, the greater the shock. Paying off a one hundred fifty thousand dollar debt over ten years can easily double your previous interest-only amount.
The calculator lay it all out to help you prepare for the shock. The calculator asks for several inputs. Your credit limit and outstanding balance gives you the utilization calculation. Select a rate method. You can choose one combined APR or break it out as a margin plus an index. This second option lets you model what happens when Prime moves away from your lender’s spread. Next up, input the length of the remaining draw and how long you’ll repay.
The output includes the amortizing payment and the interest-only payment. It also shows the shock and total interest paid if you stay interest-only the whole time. Those figures makes you rethink credit usage. Reduce the principal while in the draw period if the sting is too severe. The smaller that balance today, the smaller the payment tomorrow. Alternatively, tuck away the excess (i.e., the difference between the new and old payment) each month. This builds a cushion for the adjustment.
Since rates vary, double-check your lifetime rate cap. Borrow with eyes wide open and borrow with confidence. You’ll know precisely what you’re paying every month, today and thereafter.
