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⚙ Interactive calculator — enter values to calculate instantly.
A HELOC (Home Equity Line of Credit) has two distinct phases: the draw period and the repayment period. Understanding both is critical — many borrowers are surprised when repayment begins and payments jump significantly.
During the draw period, you can borrow up to your credit limit as needed and repay, similar to a credit card. Most HELOCs require interest-only payments during the draw period. On a $50,000 HELOC with $30,000 drawn at 9% Prime+1%: Interest-only payment = $30,000 × 9% / 12 = $225/month. Principal not required during this phase.
When the draw period ends, the outstanding balance is amortized over the remaining repayment period. The same $30,000 balance now requires principal + interest payment. At 9% over 15 years: $304/month. Payment increased by $79/month — manageable. But if you drew the full $50,000 at 9% over 15 years: $507/month — more than double the draw-period payment. Payment shock is the #1 HELOC risk.
| Amount Drawn | Draw Period (Interest Only) | Repayment (15 yr) | Payment Jump |
|---|---|---|---|
| $25,000 | $187/mo | $254/mo | +$67 |
| $50,000 | $375/mo | $507/mo | +$132 |
| $100,000 | $750/mo | $1,014/mo | +$264 |
Use this calculator as a starting point, not a final answer. Run three scenarios: pessimistic (lower returns, higher costs, worst-case tax rates), base case (your expected scenario), and optimistic (favorable conditions). The range between these three scenarios tells you how much uncertainty surrounds your plan and how much buffer you need.
Once you have your numbers, cross-reference them with complementary calculators. A mortgage payment should be checked against your overall budget and DTI ratio. A retirement projection should account for Social Security income, potential pension, and healthcare costs in retirement. Tax calculations should be checked against available deductions and credits you may qualify for. No single calculator captures everything.
Where you hold investments matters as much as what you hold. High-growth assets belong in Roth accounts where growth is tax-free. Income-producing assets like bonds belong in traditional 401(k) or IRA where taxes are deferred. Tax-managed index funds belong in taxable brokerage where you can harvest losses. This asset location strategy adds 0.2-0.4% annually to after-tax returns without changing your investments at all.
The lifetime value of proper tax planning for a median American household is approximately $150,000-300,000 in additional wealth at retirement — the difference between tax-smart and tax-naive investment management over 30 years. Most of this benefit comes from three decisions made once: choosing the right account types, maximizing employer match, and selecting low-cost index funds.