HELOC vs Cash-Out Refi Calculator 2026
Compare a HELOC (Home Equity Line of Credit — variable rate, second lien, doesn't disturb your first mortgage) against a cash-out refinance (fixed rate, replaces your existing first mortgage with a larger loan) using 2026 market rates. See total interest, monthly payment, and break-even side by side.
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HELOC vs Cash-Out Refi — Structural Differences
A HELOC is a Home Equity Line of Credit: a second-lien loan that creates a revolving credit line against your home equity. You draw cash as needed during a 5-10 year "draw period" and repay during a subsequent 10-20 year "repayment period". HELOCs are variable rate, indexed to Prime Rate plus a margin (e.g., Prime + 0.5%). The first mortgage is untouched. A cash-out refinance replaces your existing first mortgage entirely with a new, larger first mortgage at today's rates. The difference between the new loan and the old balance is paid to you in cash. Cash-out refis are typically fixed rate for the full 15-30 year term. Per CFPB consumer education, the structural difference makes them suit different scenarios. Last updated May 2026.
When HELOC Beats Cash-Out Refi
HELOC is the right answer when: (1) your existing mortgage rate is well below current rates (e.g., your 3.5% mortgage vs today's 7% cash-out rate) — a refi would force you to give up your low first-lien rate on the entire balance; (2) you need flexible access to funds over time (renovation projects, business cash flow) rather than a lump sum; (3) you expect to pay off the borrowed amount within 3-7 years; (4) you're rate-bullish and expect Prime Rate to fall during the borrowing period. Per Federal Reserve historical data, HELOC rates closely track the Fed Funds rate — when rates are at cyclical highs (as in 2026), HELOCs are expensive but expected to fall.
When Cash-Out Refi Wins
Cash-out refi is the better choice when: (1) your current mortgage rate is at or above today's rates (refi may not raise your payment much); (2) you want a fixed, predictable monthly payment with no rate risk; (3) you need a large lump sum (above $100k) with a long repayment horizon; (4) you can lock in closing costs in the loan amount without disturbing cash savings; (5) you expect to stay in the home for the long term, spreading closing costs over many years. Per Fannie Mae Selling Guide, the maximum cash-out LTV is 80% — your home value must be at least 1.25× the new loan amount.
Tax Deductibility Difference
Both HELOC and cash-out refi interest are deductible only if used to "buy, build, or substantially improve" the home that secures the loan, per IRS Publication 936 post-TCJA rules. Interest on funds used for personal expenses (debt consolidation, vehicles, vacations) is NOT deductible. The deduction is capped at $750,000 total acquisition debt (down from $1M pre-TCJA). When the funds are used for substantial home improvements, both products produce identical tax treatment — neither has an inherent tax advantage. Total combined first-lien plus HELOC must stay within the $750k acquisition debt cap to deduct all interest. Source: CFPB, Fannie Mae Selling Guide 2026, IRS Publication 936, Freddie Mac Primary Mortgage Market Survey.