HELOC vs. home equity loan vs. cash-out refi: renovation financing compared

The three products compared: structure and terms

HELOC (Home Equity Line of Credit): Structure: revolving line of credit secured by your home equity. Draw period (typically 10 years) + repayment period (10-20 years). Rate: variable, typically Prime Rate + 0-2% spread. Current rate (mid-2025): Prime Rate at 8.50% = HELOC rates of 8.5-11%. Payment during draw period: interest-only payments allowed. This makes monthly payments low but you build no equity — you owe the same principal at end of draw period if you only pay interest.

Home Equity Loan: Structure: fixed-rate lump-sum loan; fully amortizing from day one. Rate: fixed, typically 0.5-1.5% above HELOC rates currently = 8.5-10.5%. Payment: fully amortizing (principal + interest) from Month 1. No draw period — you receive the full amount at closing and immediately begin paying it down.

Cash-Out Refinance: Structure: replaces your existing first mortgage with a new, larger mortgage; you receive the difference in cash. Rate: current 30-year conforming mortgage rates (~7-8% mid-2025). Payment: new monthly mortgage payment covers the full refinanced amount. You have one payment instead of two — but you've extended or reset your mortgage timeline.

The critical issue with cash-out refi in 2025: most homeowners refinanced to 2.5-3.5% fixed rates in 2020-2021. Doing a cash-out refi means trading that rate on your existing balance for a new 7-8% rate on the entire new balance. The interest cost of 'unlocking' equity this way is enormous.

The tax deduction: when it applies and when it doesn't

Under IRC § 163(h) (as amended by the Tax Cuts and Jobs Act of 2017), home equity loan and HELOC interest is deductible ONLY when the funds are used to 'buy, build, or substantially improve' the home securing the loan.

Qualifying uses (interest deductible): - Renovation, addition, or substantial improvement to the home - Addition of a new room, deck, pool - Major repair that improves or extends the home's useful life

Non-qualifying uses (interest NOT deductible): - Paying off credit card debt - Purchasing a vehicle or other personal property - Vacation or education expenses - Investment in assets other than the home

IRS Publication 936 ('Home Mortgage Interest Deduction') provides guidance. For mixed use (part home improvement, part debt consolidation), allocate interest proportionally between the two uses.

The deduction requires itemizing on Schedule A. Post-TCJA, the standard deduction ($29,200 for MFJ in 2024) is high enough that most taxpayers no longer itemize, making the mortgage interest deduction of limited practical benefit to many homeowners even when technically available. The Home Equity Renovation Financing Calculator models your after-tax interest cost based on whether you itemize.

How much equity can you borrow against?

Most lenders allow combined loan-to-value (CLTV) up to 80% of the home's appraised value:

Formula: Maximum HELOC/HEL = (Home Value × 80%) − Existing First Mortgage Balance

Examples: Home Value: $450,000 Existing Mortgage Balance: $250,000 Maximum equity borrowing: ($450,000 × 0.80) − $250,000 = $360,000 − $250,000 = $110,000

Home Value: $350,000 (purchased recently, less equity) Existing Mortgage Balance: $310,000 Maximum equity borrowing: ($350,000 × 0.80) − $310,000 = $280,000 − $310,000 = -$30,000 (no equity borrowing possible)

Some lenders offer 85% or 90% CLTV at higher rates (or with PMI). VA cash-out refinance allows up to 100% LTV for eligible veterans. The maximum borrowing is also limited by your debt-to-income ratio — lenders typically require total debt service (including the new HELOC/HEL payment) to be under 43-45% of gross income.

Verify: your home's current appraised value, not the Zillow estimate — lenders order their own appraisals, which may differ from automated valuation models by 5-15%.

Choosing the right product for your renovation scenario

Matching financing product to renovation type:

Phased renovation over 18-24 months (e.g., kitchen remodel Phase 1, then bathroom Phase 2): Best: HELOC — draw funds as needed for each phase; only pay interest on what you've drawn. Flexibility is worth the variable rate risk for a finite project duration.

Fixed-budget single project (e.g., $75,000 addition; all contracted upfront): Best: Home equity loan — fixed rate and payment provides certainty. You receive the full amount at closing and begin paying it down immediately.

Large renovation + current mortgage rate > 6.5% (rare as of 2025): Possible: Cash-out refinance — if your current mortgage rate is above 6.5%, a cash-out refi at today's 7% might not hurt much to combine. Do the math comparing two payments (current mortgage + new HELOC/HEL) vs one new payment.

Emergency repair or unknown scope (e.g., foundation issue with uncertain extent): Best: HELOC — open the line before you need it (can take 4-6 weeks to close); draw only what's needed; pay it down as the project scopes out. Having the line available is valuable even if you don't draw on it.

Primary sources cited

• IRS Publication 936 — Home Mortgage Interest Deduction
• IRC § 163(h) — Disallowance of Deduction for Personal Interest
• Federal Reserve H.15 — Consumer Credit Rates