Bridge Loan vs HELOC vs Cash Offer: Financing a Purchase Before You Sell

The short answer

If you can qualify to carry two mortgages at once, a home equity line of credit (HELOC) opened before you list is usually the cheapest way to fund your next purchase from your current equity: you borrow only what you draw, pay interest only on that balance, and upfront costs tend to be low. A bridge loan is faster and lets you make a non-contingent offer, but it typically costs more in rate and fees and is short-term by design. A cash-offer or "buy before you sell" program is often the safest in the narrow sense that it can remove the two-mortgage risk entirely — but you pay for that convenience through program fees and sometimes a lower net price on your old home.

There is no universal winner. The right answer depends on how much equity you have, whether your income and debt-to-income (DTI) ratio let you hold two loans at once, your timeline, and how much risk you can absorb if your current home takes longer to sell than expected. Rates, fees, and program terms vary by lender, company, and state, and they change over time. Treat the descriptions below as categories to compare — not as quotes — and get written estimates from a licensed lender before you commit.

Why this is really a cost-vs-risk decision

Every option here solves the same timing problem: you need money for a down payment (or a full purchase) before the cash from your sale arrives. They differ mainly on two axes:

• Cost of carry — the interest, fees, and any price concession you accept, for the weeks or months you own two homes.
• Risk exposure — what happens if the old home doesn't sell on schedule, and whether you're contractually stuck making two payments.

The cheapest option on paper is rarely the safest, and vice versa. Sorting by your constraint — cash on hand, DTI headroom, or peace of mind — is more useful than chasing the lowest rate.

Option 1: HELOC (usually the cheapest, if you qualify)

A HELOC is a revolving line secured by your current home. You draw what you need for the down payment, then repay it when your home sells.

• Cost: HELOC rates are typically variable, tied to an index such as the prime rate, so your payment can move if rates change. Upfront/closing costs are often low or waived, though some lenders charge annual or early-closure fees. Because you pay interest only on the amount drawn, a short holding period keeps total cost down.
• Best for: Owners with substantial equity and enough income to be approved while still carrying their existing mortgage.
• The critical catch: Many lenders will not open a new HELOC on a home you've already listed or plan to sell shortly, and some freeze or reduce lines once a property is on the market. Apply before you list, while your income and occupancy picture supports approval. Confirm the lender's policy in writing.

The Consumer Financial Protection Bureau (CFPB) publishes plain-language explainers on how HELOCs work, including the draw period, variable rates, and the fact that your home is collateral.

Option 2: Bridge loan (fast, flexible, more expensive)

A bridge loan is short-term financing secured by your current home — or sometimes by both homes — that "bridges" the gap until your sale closes. It can fund your down payment or, in some structures, a larger share of the new purchase.

• Cost: Bridge loans generally carry higher interest rates and origination or administrative fees than a HELOC or a standard mortgage, reflecting their short term and speed. Some are structured with no monthly payments for an initial period, with interest accruing or due at payoff — convenient, but not free.
• Best for: Buyers in competitive markets who need to make a clean, non-contingent offer quickly and expect their current home to sell soon.
• The risk: These are short-term instruments (often months, not years). If your home doesn't sell before the term ends, you may face payoff pressure, extension fees, or the cost of carrying the bridge plus a new mortgage. Ask about the term length, what happens at maturity, and any prepayment terms.

Option 3: Cash-offer / "buy before you sell" programs

These are programs — offered by some brokerages, lenders, and specialized companies — that let you buy your next home before selling the current one, often by backing your purchase with cash or by buying your existing home directly.

• How they work varies widely. Some advance funds or make an all-cash offer on your behalf so you can close on the new home, then you sell the old one normally. Others purchase your current home outright (a trade-in or "instant offer" model) so you're not carrying two mortgages at all.
• Cost: Expect program or service fees, and in direct-purchase models, potentially a lower net price than a fully marketed sale would bring. The trade-off is convenience and the removal of two-mortgage risk.
• Best for: People who prioritize certainty and a single, coordinated move over squeezing out the last dollar of sale price.
• What to scrutinize: Read the contract closely. Compare the guaranteed offer against a comparative market analysis, and identify every fee. Terms differ dramatically between providers, so a program that's a good deal in one market may not be in another.

Home Stimulus offers cash-offer options in eligible areas as one of these paths — worth comparing against a HELOC or bridge loan quote if avoiding two mortgages matters most to you.

Two lower-profile alternatives

• A sale contingency costs nothing: your purchase offer is contingent on your current home selling. It's the safest structure financially, but in a competitive market a contingent offer is often less attractive to sellers and may be rejected.
• A cash-out refinance replaces your current mortgage with a larger one and hands you the difference. It can be cheaper than a bridge loan, but it's slower to close and, like a HELOC, is generally easier to arrange before you list.

How to compare them apples-to-apples

Don't compare interest rates alone. Estimate the total cost of carry for your realistic holding period:

• Interest on the borrowed amount (use the APR, not just the note rate)
• Origination, closing, annual, and early-payoff/prepayment fees
• Any price concession on your old home (for direct-purchase programs)
• The cost of carrying two mortgage payments while both homes are yours

For any loan, request a written estimate and compare them side by side. The CFPB provides free tools and a standardized Loan Estimate form to make offers comparable, along with guidance on questions to ask before you sign.

A safety checklist before you commit

• Could you afford both payments for several extra months if your sale stalls? If not, lean toward a contingency or a program that removes the double payment.
• Is the rate fixed or variable? A variable HELOC can cost more if rates rise during your holding period.
• Are there prepayment penalties or minimum-interest charges that punish a quick payoff — which is exactly your plan?
• For programs, do you have the offer in writing, with every fee itemized and compared to a market sale?
• Does your lender allow the product given that you intend to sell the collateral home? Confirm before you apply.

The bottom line

For most owners with strong equity and income, a HELOC arranged before listing is the lowest-cost way to fund the next purchase. When speed and a non-contingent offer matter more, a bridge loan buys flexibility at a higher price. When avoiding two mortgages is the priority, a cash-offer or buy-before-you-sell program trades some money for a lot of certainty. Because this decision turns on your DTI, your timeline, and terms that vary by state and provider, have a licensed lender and, where relevant, a real-estate attorney review the specifics before you sign.