HELOC & Mortgage Recast
Payment breakdown
Interest & break-even
Total monthly housing cost
Where your money goes over time
If the freed-up cash is invested at 7%, the saved payments grow to about $0 by payoff.
Four ways to use that cash
| Scenario | Monthly P&I | Interest left | Payoff | What happens |
|---|
Show the full amortization schedule (before vs after)
| # | Int. now | Prin. now | Bal. now | Int. recast | Prin. recast | Bal. recast |
|---|
How to use this calculator
- Enter your current loan balance, interest rate, and remaining term.
- Enter the lump-sum amount you plan to pay toward principal.
- Click Calculate to see your new payment, interest savings, and comparison.
About this tool
A home equity line and a recast pull in opposite directions — one draws equity out, the other pushes cash in. Used together thoughtfully they can restructure your monthly costs; used carelessly they can turn flexible, tappable equity into a locked-in payment cut. Here's how they interact, and a model to test the numbers.
Two tools, opposite directions
A recast takes cash and permanently lowers your first mortgage payment by reducing principal. A HELOC does the reverse — it lets you borrow against your equity, usually at a variable rate, giving you flexible access to cash. Combining them is a deliberate trade, and the direction of the trade is what makes it either smart or risky.
Where it can make sense
The cleaner use is sequencing, not stacking. Say you sold a property or received a windfall: you recast your first mortgage to cut the fixed payment, and separately keep a HELOC open as a low-cost safety net for emergencies or opportunities. You get the payment relief of a recast while preserving access to liquidity — addressing the biggest downside of paying down a mortgage, which is that the cash becomes hard to reach.
Where it gets dangerous
The risky version is borrowing from a HELOC specifically to fund a recast — drawing variable-rate debt to lower a fixed-rate payment. That can invert your risk: you've swapped a predictable obligation for one that can rise, and you've consumed the very equity cushion that made you resilient. Unless the numbers are unusually compelling, using borrowed equity to recast a mortgage adds risk rather than removing it.
- Variable-rate exposure. HELOC rates typically float; a recast payment is fixed. Funding one with the other can trade certainty for volatility.
- Equity depletion. Both a recast (cash in) and a HELOC draw (equity out) reduce your accessible cushion in different ways — understand your combined liquidity afterward.
- Two sets of terms. Draw periods, minimums, and fees on the HELOC sit alongside your recast — keep both straight.
Rule of thumb: recast with cash you can afford to lock away, and treat a HELOC as a backstop — not as the source of the recast payment.
Model the recast side first
See the payment drop and interest saved before layering in any HELOC decision.
HELOC and recast questions
Should I use a HELOC to recast my mortgage?
Usually not. Borrowing variable-rate equity to lower a fixed-rate payment can increase your risk and deplete your cushion. Recasting is best funded with cash you can afford to lock into equity.
Can I recast and keep a HELOC open?
Yes, and that pairing can be sensible: recast to cut your fixed payment while keeping a HELOC available as a liquidity backstop. They're separate products on the same property.
Does a recast affect my HELOC?
A recast changes your first mortgage's payment, not your HELOC directly. But paying down your first lien changes your overall equity picture, which can matter for future HELOC limits.
Is a HELOC or a recast better for cash flow?
They solve different problems — a recast lowers your fixed payment, a HELOC provides access to cash. If your goal is a lower monthly bill, a recast is the direct tool.