HELOC Draw and Repayment Payment Calculator
Compare interest-only draw-period payments with fully amortizing HELOC repayment payments.
Compare interest-only draw-period payments with fully amortizing HELOC repayment payments. Example result: interest-only monthly payment = $333.33. Compare your own inputs below. Estimates depend on the stated assumptions and are not a quote or forecast. Defaults are illustrative, not recommendations.
Your result
- Interest-only monthly payment
- $333.33
- Repayment monthly payment
- $477.83
- Payment increase at repayment
- $144.49
- Repayment-period interest
- $36,008.69
With the example inputs, interest-only monthly payment is $333.33. The transition into repayment can raise your payment even if the interest rate stays unchanged. Try a higher rate as a second scenario because many HELOC rates vary.
How to use this heloc draw and repayment payment calculator
- Drawn HELOC balance: enter the amount in your selected currency. The worked example uses $50,000.00.
- Assumed annual rate: enter a percentage using 5 to mean 5%. The worked example uses 8%.
- Repayment period in months: enter the quantity in months. The worked example uses 180 months.
Start with figures from the same statement date or planning period. Calculate once, save scenario A, then change one assumption to understand its effect. The comparison shows B minus A; a positive difference means the result increased, which is not automatically better.
Formula and calculation method
Draw interest = balance × annual rate / 1200; repayment payment = PMT(balance, monthly rate, months).
The calculator evaluates this relationship directly in your browser. The displayed precision is for readability and does not imply a guaranteed outcome. Time periods and rate conventions matter: use the exact units in each input label and avoid mixing monthly and annual values.
What the result means
The transition into repayment can raise your payment even if the interest rate stays unchanged. Try a higher rate as a second scenario because many HELOC rates vary.
Two worked examples
1. Illustrative planning scenario
Drawn HELOC balance = $50,000.00; Assumed annual rate = 8%; Repayment period in months = 180 months.
Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.
| Output | Calculated result |
|---|---|
| Interest-only monthly payment | $333.33 |
| Repayment monthly payment | $477.83 |
| Payment increase at repayment | $144.49 |
| Repayment-period interest | $36,008.69 |
2. Simplified calculation check
Drawn HELOC balance = $12,000.00; Assumed annual rate = 0%; Repayment period in months = 12 months.
Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.
| Output | Calculated result |
|---|---|
| Interest-only monthly payment | $0.00 |
| Repayment monthly payment | $1,000.00 |
| Payment increase at repayment | $1,000.00 |
| Repayment-period interest | $0.00 |
The second example uses simpler inputs to make the arithmetic easier to check. It is also included in the automated regression suite. These examples illustrate the model and are not market averages, live offers or personalized advice.
Assumptions and limitations
Assumes no further draws, constant rate, monthly interest and no fees. Actual HELOC minimum-payment rules and variable rates can differ.
Use this output to frame a question or compare consistent scenarios. Reconcile any decision involving an actual product, employment agreement or financial statement with its underlying documents. If a contract uses different rounding or timing, its result may differ from this estimate.
Frequently asked questions
Does interest-only repayment reduce the balance?
No. Paying only accrued interest leaves principal unchanged, so the balance still needs to be repaid later.
How do I interpret the interest-only monthly payment result?
The transition into repayment can raise your payment even if the interest rate stays unchanged. Try a higher rate as a second scenario because many HELOC rates vary.
What assumptions can change this estimate?
Assumes no further draws, constant rate, monthly interest and no fees. Actual HELOC minimum-payment rules and variable rates can differ.
Can I compare two scenarios without creating an account?
Yes. Save scenario A, change one or more inputs to create scenario B, and compare each result with its difference. Neither scenario requires an account.
Can I use this calculator in another currency?
Yes. Select a display currency and enter every monetary input in that currency. This changes formatting only; it does not convert exchange rates or apply local laws. The static worked examples are in USD.
Sources and verification
The following primary sources provide background on the financial concepts. CalcPane’s formula and assumptions above define this specific model; these organizations do not endorse CalcPane or certify its outputs.
Formula implementation and worked examples checked by automated tests on 2026-10-17. Inspect this calculator’s inputs and expected outputs. Read our calculation methodology. Independent professional review has not been completed for this release.
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Cite this calculator
CalcPane. (2026-10-17). HELOC Draw and Repayment Payment Calculator. https://calcpane.com/heloc-draw-and-repayment-calculator/
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