HELOC Capacity and Payment Scenario
Estimate capacity from an entered lender CLTV and secured amount, then model payments on the requested draw at a constant rate.
What This Calculator Does
Estimate additional borrowing capacity from entered property value, lender CLTV and the lender-counted existing secured amount. Separately model payments on the requested principal: a constant-balance interest-only phase followed by full monthly amortization at the same rate. This is not home equity, approved credit, net cash received or a forecast of future variable-rate bills.
Who Is This For
For Florida homeowners and agents reviewing a clearly specified HELOC scenario. Use lender-confirmed debt-counting, CLTV, rate, phase terms and charges rather than universal lending ratios or market defaults. Existing mortgage payments remain outside the displayed HELOC amounts.
How It Works
Enter the property value, the total existing secured debt the lender counts, the lender's CLTV limit and the amount you want to draw. With a draw, enter the rate, 0–50 whole interest-only years and 1–50 whole repayment years. A draw of 0 needs no rate or periods; with 0 interest-only years, repayment starts right away. Tick the confirmation, then review the capacity, the room left or excess (+ or −), monthly payments by phase and the totals. Change only real figures and recalculate.
Frequently Asked Questions
Is modeled capacity the same as home equity or approved credit?
No. The model rounds value times entered CLTV down to cents, subtracts the lender-counted existing secured amount and floors additional capacity at zero. Include all existing property-secured debts and lines on the lender's basis, including full line commitments if counted, not just the first mortgage. This is a scenario capacity estimate, not actual home equity, underwriting or a commitment. No universal 85% rule is assumed.
Are payments based on the full line or my actual draw?
They use the requested outstanding principal, assumed drawn from the beginning and unchanged throughout interest-only payments. If financed charges are part of that principal, include them; it is not the same as net cash received. The model does not simulate additional draws, principal paydowns during the draw phase or revolving transaction history. Repayment then fully amortizes that principal.
Does the constant-rate estimate cap my future payments?
No. The entered nominal annual rate divided by 12 is held constant in both phases. It is not APR, daily accrual or a lender invoice. Real variable-rate HELOC payments can change with the rate even if no further money is drawn. This scenario is not a future upper bound. Obtain the lender's index, margin, adjustment terms and rate caps; the calculator does not invent those controls.
What happens with zero draw, zero interest-only years or decimal years?
Zero draw produces zero modeled HELOC payments; rate and phase times are not required or applicable, not fake zero-rate quotes. A positive draw with zero interest-only years begins amortization immediately; interest-only monthly payment and phase increase are not applicable. Enter whole years: 2.0 means 2, and 5.0 means 5, not 20 or 50. Fractions are rejected. The model does not support a balloon plan.
What if the requested draw exceeds capacity?
The amount you ask for isn't quietly cut: its payments stay visible with an over-limit status. Room left = capacity minus the draw; a negative number means you're asking for more than the limit, not available credit. The excess shown is the draw above capacity (capacity never goes below zero). If existing debt is already above the CLTV ceiling, capacity is zero and the excess is the full draw, not an extra count of the old shortfall. No approval of the line is implied.
Do totals include fees, and why can monthly multiplication differ?
Total payments = interest during the interest-only period + principal and interest during repayment; principal is counted once. Separate origination, transaction, annual and other fees aren't added, while charges already rolled into the principal you entered stay in that balance. Existing mortgage payments and net cash received aren't calculated. Totals come from the exact monthly calculation, rounded to the cent by category, so the monthly payment shown × months can differ slightly. Use the totals provided, confirm actual quotes and understand the risk to your home. The $100 billion limit on results is a calculator limit, not a lending limit.