Bridge loans: how they work, what they cost, and when something cheaper is the better answer

You found the house. Yours is not sold. The down payment you need is sitting in the walls of the home you still live in, and the seller of the new place wants an offer that is not contingent on you finding a buyer.

A bridge loan is one way through that. It is also, for most people who ask me about it, the most expensive way through that — and the reason usually comes down to when they asked. So here is how the product actually works, what it costs in real numbers, and the handful of situations where it is genuinely the right call.

A bridge loan is a short-term second mortgage against the home you have not sold yet

The mechanics are simpler than the name suggests. A lender places a loan against your current home, secured by the equity you have built in it. You take those funds to closing on the new house as your down payment. When your old home sells, the sale proceeds pay the bridge loan off in full.

The typical shape: a term of six to twelve months, interest-only payments or in some cases no payments at all during the term, and a payoff triggered by the sale rather than by a schedule. It is designed to disappear. A bridge loan that is still outstanding at month eleven is a problem, not a plan, which is why the exit matters more to an underwriter than almost anything else about the file.

It solves cash. It does not solve qualifying.

This is the single most common misunderstanding, and it costs people weeks.

Buying before you sell puts two separate hurdles in front of you. The first is qualifying — whether your income supports both mortgage payments at once, since until the old house closes you are legally responsible for both. The second is cash — whether you can physically produce a down payment while your equity is still illiquid.

A bridge loan only touches the second one. In fact it works slightly against the first, because the bridge payment itself is usually counted in your debt-to-income ratio alongside both mortgages. If carrying both payments is what is stopping you, a bridge loan does not fix it, and no amount of shopping for a better bridge lender will change that.

The qualifying side has its own set of answers — including using 75% of a properly documented lease on the departing home to offset that payment, which has strict documentation requirements most people get wrong. I wrote that up separately: how to buy before you sell, including qualifying while carrying both. Read that first if the question is whether you can afford it. Read this one if the question is only how to free up the cash.

What it costs, and why the interest rate is the wrong number to look at

Bridge loans price higher than a first mortgage. That much people expect. What they do not expect is that the rate is usually not the expensive part.

Because the loan lives for months rather than years, the origination cost dominates the effective price. A point or two of origination amortized over a thirty-year mortgage is a rounding error. The same two points amortized over seven months is not.

Run it. Say you need $100,000 of bridge financing for seven months:

• Interest at a rate two points above your first mortgage, interest-only, for seven months — real money, but predictable, and you can estimate it in your head.
• Origination of two points on that $100,000 is $2,000, paid regardless of whether the house sells in month two or month seven.
• Title, recording and closing costs on a second lien, which are not proportional to how long you keep it.
• The carry — during the overlap you are making the old mortgage payment, the new mortgage payment, and the bridge payment, plus two sets of taxes, insurance and utilities.

Convert that origination into an annualized cost over a seven-month life and the effective number is a great deal higher than the rate on the note. That is not a criticism of the product; it is just what short-term borrowing looks like. But it is the reason the comparison below usually goes the way it does.

Most of the time, a line of credit on your current home is cheaper — and the window closes when you list

A home equity line of credit against your departing residence does the same job. You draw what you need for the down payment, and you pay it off from the sale proceeds exactly as you would a bridge loan. The difference is that a HELOC is usually a far cheaper instrument to open, and many lenders write them with little or no origination cost at all.

I will say the same thing here that I say on every page where this comes up: a bank or a credit union will often price a home equity line better than I can. That is not modesty, it is the market — depositories fund these on their own balance sheet and price them accordingly. I originated home equity lines and home equity installment loans during my years on the bank side, which is exactly why I know where they win. If that is your best route, take it.

If you are even considering a move-up purchase in the next six months, set the line up now, while your current home is not on the market. You are not obligated to draw on it. An undrawn line costs you nothing and preserves the cheaper option. If you want the full mechanics of how draw and repayment periods work, that is on the HELOC page, and the direct comparison with a cash-out refinance is here.

When a bridge loan is genuinely the right tool

There are real cases. They tend to share a feature: something has already foreclosed the cheaper options.

• The home is already listed or under contract. The HELOC window has closed. This is the most common legitimate case by a wide margin.
• You need a non-contingent offer to compete. In a market where sale-contingent offers get passed over, the ability to write clean can be worth more than the cost of the bridge — particularly if it also wins you a better price.
• The equity is large and the timeline is short. A well-priced home in a fast market with a big equity position is a low-risk bridge, and lenders price and approve it accordingly.
• The new purchase will not wait. New construction with a fixed closing date, a relocation with a hard start date, a family situation with its own clock.

What these have in common is that the alternative is not a cheaper loan — it is losing the house. That is a real cost too, and it belongs in the comparison.

The alternatives worth pricing before you commit

Beyond a home equity line, several of these solve the same problem and most people never get presented with them.

A rent-back from your buyer

You sell first, then stay in the home as a tenant for a defined period after closing while you complete your purchase. Your equity is liquid, you have cash in hand, you carry no bridge and no double mortgage, and you are buying as a non-contingent cash-strong buyer. It is the cleanest version of this whole problem when the sequencing cooperates.

Two things to know. Rent-backs are typically written for short periods, and the length matters to your new lender: an extended post-closing occupancy on the home you just sold can complicate how the new loan treats occupancy, so the term needs to be set with your loan in mind, not just your moving schedule. And the rent is negotiable — in a competitive market it is frequently free, and it is one of the most valuable concessions a buyer can offer you.

A sale contingency

The offer is contingent on your current home selling. It costs nothing and it carries no financing risk at all. Its weakness is competitive, not financial — in a multiple-offer situation it is the first offer a seller sets aside. In a slower market, or on a home that has been sitting, it is often perfectly acceptable and nobody needs a bridge loan at all.

Buy now, recast later

If you can produce a smaller down payment from savings, you buy with what you have, then apply the sale proceeds to the new mortgage as a lump sum and recast the loan — which re-amortizes your payment down over the remaining term while keeping your existing rate and without a refinance. It costs a few hundred dollars rather than thousands. It works when your problem is optimizing the payment rather than reaching the closing table.

Retirement account and securities-backed borrowing

A 401(k) loan or a line secured by a brokerage account can be cheaper than a bridge loan, sometimes considerably. These carry their own risks and tax consequences and they are genuinely outside my lane — talk to whoever manages that money before you touch it. But they belong on the list, and they are often absent from it.

What underwriting actually wants to see

A bridge lender is underwriting an exit, not a borrower’s thirty-year story. In practice that means:

• Real equity in the departing home, evidenced by an appraisal or broker price opinion. Combined loan-to-value limits on the departing residence are the binding constraint on how much you can bridge.
• A credible sale. An executed contract is strongest. An active listing at a defensible price is next. A home not yet on the market is the hardest version and prices accordingly.
• Capacity to carry everything. Both mortgages and the bridge payment, generally counted in full unless a documented lease offsets the departing payment.
• Reserves. Lenders want to see that a sale taking longer than planned is an inconvenience rather than a crisis.

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The order of operations that actually works

1. Before you list anything, find out whether you qualify carrying both payments. That answer determines which of these tools is even relevant.
2. If a move is plausible within six months, open the home equity line now, while the house is not on the market. Undrawn, it costs nothing and it preserves the cheapest option you have.
3. Get a real read on your equity and what a sale nets after costs — not the number a listing site shows you.
4. Decide the offer strategy with your agent, because whether you need a non-contingent offer is a market question, and it drives everything downstream.
5. Price the alternatives against each other — line of credit, rent-back, contingency, recast-later, bridge — on total cost for the months you actually need, not on rate.
6. Then choose. By this point the right answer is usually obvious, and often it is not the bridge loan.

The reason I put the conversation first on this one is not that I am holding anything back — everything I know about it is above. It is that the right answer genuinely depends on your numbers: how much equity, how fast your market is moving, whether you have already listed, and whether you can carry both. Those five facts change the recommendation completely, and no article can know them.

I work with agents, lenders and title companies. I work for you. If the honest answer is that your credit union should write you a line of credit and you never need a bridge loan at all, that is the answer you will get from me.