Can You Use a HELOC to Buy Another House? Rules, Tradeoffs, and When It Makes Sense
Yes — you can use a home equity line of credit (HELOC) on your current primary residence to buy another house, either as the down payment on a mortgaged purchase or, if you have enough equity, to buy the second property outright. Lenders typically let you borrow up to 80–85% of your home's appraised value minus your existing mortgage balance (CFPB — What is a HELOC?). The mechanics are straightforward. The tradeoffs are not: you'd be carrying debt against two properties at a variable rate, with your primary home as collateral if either loan goes sideways. Under current tax law, the interest is generally not deductible when HELOC proceeds go toward a different property (IRS Publication 936). This guide covers the mechanics, HELOC vs. HELOAN vs. cash-out refi, the tax rules, the risks, and the narrow cases where it can make sense.
Key Takeaways
- Lenders typically cap HELOC borrowing at 80–85% combined loan-to-value (CLTV) — your existing mortgage plus the new HELOC combined can't exceed 80–85% of the home's appraised value (CFPB).
- HELOCs carry variable interest rates tied to the prime rate; most adjust monthly, and the Federal Reserve tracks HELOC rates in its consumer-credit release (Federal Reserve G.19).
- Under the Tax Cuts and Jobs Act (originally 2018–2025, extended by the 2025 tax package for 2026 and beyond), HELOC interest is deductible only if proceeds are used to buy, build, or substantially improve the home securing the loan — using a HELOC on your primary to buy a different property means the interest is generally not deductible (IRS Publication 936).
- Investment-property HELOCs exist but are harder to get — HELOCs are portfolio-held, so each lender sets its own cutoffs. In practice, fewer lenders offer investment-property HELOCs, CLTV limits are lower (often 65–75%), and rates run higher because non-owner-occupied properties carry higher default risk.
- The sharpest risk is collateral concentration: two loans, two properties, but only your primary home backs the HELOC — default on the HELOC and you can lose the house you actually live in.
- Alternatives worth pricing: home equity loan (fixed rate), cash-out refinance, or selling your current home first — each carries a different rate, tax, and risk profile than a HELOC.
The Short Answer
Most lenders allow it. Fannie Mae's Selling Guide B3-4.3-04 permits home-equity funds (including HELOC proceeds) as a source of down-payment funds on a new Fannie-eligible purchase loan, and Freddie Mac follows a similar policy. What makes this different from a standard second-home mortgage: you're holding three pieces of debt — existing primary mortgage, the new HELOC, and (if not paying all-cash) a purchase mortgage on the second property. Two of the three are secured against the home you live in. Decisions to lever a primary residence to acquire additional property are a conversation for a fiduciary financial planner and a tax professional, not a search result.
How Using a HELOC to Buy a Second Home Works
A HELOC is a revolving line of credit secured by home equity. You get a credit limit at closing, then draw funds during a draw period (typically 10 years), paying interest on what you've drawn. After the draw period, the line converts to a repayment period (typically 20 years) at full amortization. Rates are variable, tied to prime plus a lender margin (CFPB HELOC guide).
For a home purchase, get the HELOC approved and drawn before closing on the second property, then wire the funds to the settlement agent at closing. The HELOC sits as a second lien against your primary. The primary mortgage stays untouched — one reason buyers prefer HELOCs when their mortgage is at a locked-in low rate. For the full deep-dive on draw periods and fees, see what a HELOC is and how it works.
How much can you borrow?
Combined loan-to-value (CLTV): existing mortgage plus new HELOC line can't exceed 80–85% of appraised value. Example — home worth $500,000, owe $200,000: max combined debt at 85% CLTV = $425,000, minus existing mortgage = $225,000 HELOC ceiling. Actual approval depends on credit score, income, DTI, and lender risk appetite. Confirm your position via our home value guide to size current market value against your outstanding balance.
What underwriting looks like
Lighter than a purchase mortgage but still meaningful: FICO 680+ for competitive rates, DTI typically capped at 43%, two years of income documentation, appraisal, title search. Closing takes 2–6 weeks; costs run $0 to about $500 — materially cheaper than a cash-out refinance.
Two Paths — HELOC as Down Payment vs. Full Cash Purchase
HELOC as the down payment (most common)
Draw $50,000–$100,000 and use it as the down payment on a conventional or second-home mortgage. You then carry three loans: primary, HELOC, new-purchase mortgage.
Worked example: primary worth $500,000 with a $200,000 balance; take a $225,000 HELOC (85% CLTV cap), draw $50,000 as a 20% down payment on a $250,000 second home, finance the rest with a $200,000 conventional mortgage. Monthly obligations: primary (~$1,200–$1,800), HELOC interest on $50,000 at 8.5% (~$354 interest-only), second-home mortgage (~$1,200–$1,400) — potentially $2,800–$3,600 combined before taxes, insurance, and maintenance on two properties. The HELOC piece moves with prime.
HELOC for the full cash purchase
Viable only if the second property is cheap enough to cover with the line, or if your equity cushion is very large. Cash offers often beat financed offers in competitive markets. Downsides: the entire purchase sits on variable-rate debt, and if you refinance the second property later, you pay closing costs a second time. For the wider view on second-home financing, talk to a licensed mortgage advisor about your options and reserves.
HELOC vs. HELOAN vs. Cash-Out Refinance
Three common ways to convert existing home equity into cash. Each has a different rate structure, cost profile, and effect on the primary mortgage.
| Feature | HELOC | Home equity loan (HELOAN) | Cash-out refinance |
|---|---|---|---|
| Structure | Revolving credit line | Lump sum, second lien | Replaces existing mortgage |
| Interest rate | Variable (prime + margin) | Fixed | Fixed or ARM |
| Draw flexibility | Draw as needed during 10-yr draw period | Lump sum at closing | Lump sum at closing |
| Typical closing costs | $0–$500 | $1,500–$3,000 | 2–5% of loan amount |
| Effect on existing primary mortgage | None — stays in place | None — stays in place | Refinanced away; new rate applies to full balance |
| Rate risk | High — rate can move monthly with prime | None once locked | None once locked |
| Best when | Timing is uncertain, flexibility matters | You want rate certainty on a fixed sum | Your current mortgage rate is higher than today's market rate |
Decision rules: if your primary mortgage is at a low locked-in rate (sub-4% mortgages from 2020–2021), a HELOC or HELOAN preserves it — a cash-out refi would replace it at today's rate on the full balance. If you want rate certainty, HELOAN wins. If you're bridging into a sale within 12–24 months, HELOC's flexibility and low closing costs usually win. If your primary rate is already high, a cash-out refi may lower your blended cost of capital — run the math both ways.
For direct comparisons, see our guides to home equity loans and home equity lines of credit.
Primary Residence vs. Investment/Second Home
The property that secures the HELOC and the property you're buying are two separate things.
- HELOC on a primary residence. Standard and easiest. Best rates, CLTV up to 85% (sometimes 90%).
- HELOC on a second/vacation home. Available from many lenders at slightly higher rates. CLTV typically 70–80%.
- HELOC on an investment/rental property. Hardest to get. Fewer lenders; CLTV often 65–75%; rates 1–2 points higher; rental income counts only with a signed lease and a track record. HELOCs are portfolio-held, so each lender's underwriting box governs; shop 3+ lenders.
Separately, what the property you're buying is affects the purchase mortgage on that property, not the HELOC. Investment purchase mortgages typically require 20–25% down, carry rates 0.5–1 point higher, and require reserves. A qualified mortgage advisor can walk you through investment-property loan program requirements and rate/reserve implications.
The Tax Rules Under TCJA — Why the Interest Is Usually Not Deductible
This is where second-home buyers most often get the math wrong. Under the Tax Cuts and Jobs Act (originally enacted for tax years 2018–2025 and extended by the 2025 tax package), home equity loan and HELOC interest is deductible only if proceeds are used to "buy, build, or substantially improve the home that secures the loan" (IRS Publication 936; see also IRS newsroom clarification).
Using a HELOC on your primary residence to buy a different property doesn't meet that test — the loan is secured by home A; the proceeds went to home B. So the interest is generally not deductible.
Two nuances: (1) if part of the HELOC is used to substantially improve the same home that secures it, allocating deductible vs. non-deductible interest gets complex — a CPA can help; (2) the purchase mortgage on the second property itself may be deductible as acquisition indebtedness (subject to the $750,000 combined cap), separate from the HELOC. The 2025 tax package extended the TCJA MID rules for tax year 2026 and beyond — confirm current-year treatment with a tax professional.
The Risks — Variable Rate, Two Loans, One Primary-Home Collateral
Variable-rate exposure. Most HELOCs adjust monthly against prime. In the 2022–2023 rate-hike cycle, HELOC rates roughly doubled for many borrowers. Model a "rates rise three points" scenario against monthly cash flow before committing (Federal Reserve G.19).
Dual-mortgage debt load. You're paying up to three obligations simultaneously. A job loss, tenant vacancy, or unplanned repair can compound quickly. Most planners recommend cash reserves covering 6–12 months of combined obligations before making this move.
Foreclosure exposure — your primary is the collateral. The sharpest edge. The HELOC is secured against the home you live in. If the second property becomes a money pit — bad tenant, vacancy, unexpected repairs, resale weakness — and drains cash flow, you can end up defaulting on the HELOC. The lender's remedy is foreclosure on the collateral: your primary residence. You can lose the house you live in, not just the second one. The CFPB flags this directly (CFPB).
Underwater in a downturn. If home values decline 15–20% — within range of the 2008–2011 correction in many markets — an 85% CLTV borrower can end up at or above 100% CLTV. Lenders retain the right to freeze the undrawn portion when values decline, and refinancing becomes harder.
When It Might Make Sense — and When It Doesn't
It might make sense when your primary mortgage is at a low locked-in rate; your equity cushion sits well below the 80–85% CLTV cap; income is stable with visibility 5+ years out; the second property has a clear economic case (signed tenant, or a vacation property you can hold without rental income); and you have liquid reserves covering 6–12 months of combined obligations.
It usually doesn't when the equity cushion is thin, DTI is tight, or income is variable; the second property is speculative; your current mortgage rate is high and a cash-out refi would achieve the same funding at a lower blended cost; your primary is your only meaningful asset (this move concentrates almost all of your net worth in real estate at maximum leverage); or you'd rely on rental income to cover the HELOC payment.
For buyers considering a HELOC because they can't cover the down payment out of pocket, work through how to buy a house with no money down first — VA, USDA, and low-down conventional programs may achieve the same goal without the collateral concentration.
How Opendoor Fits — If Timing, Not Leverage, Is the Real Problem
Opendoor isn't a lender and doesn't originate HELOCs. But some of the people asking this question aren't trying to keep the current home — they want to buy the next house before selling the current one, and a HELOC is one bridge across that gap.
If that's the situation, an Opendoor cash offer gives you a firm sale number in 24–48 hours and a close date up to 60 days out. That preserves the timing without dual leverage. Comparison worth running: HELOC carrying cost (rate, closing costs, rate risk) vs. the Opendoor offer (any discount to open-market value, offer-specific costs) over the same timeline. If you're planning to keep the current home and add a second one, Opendoor isn't part of that decision — the comparison there is HELOC vs. HELOAN vs. cash-out refi, above.
