Buying and Selling a Home at the Same Time: Contingencies, Bridge Loans and Timing

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By Max Karasick, Compass real estate agent licensed in PA and NJ

You can buy and sell a house at the same time. You just have to decide which one leads. There are really three ways to run it: sell first and find a place to land, buy first and carry two homes for a while, or tie the two together with a home sale contingency. Bridge loans and rent-backs are the tools that close the gap between them. The right choice depends on your equity, what your lender will approve and how much overlap you can stomach.

This guide is about sequencing. For what your current house will actually net, start with what it costs to sell a home in Philadelphia. For how to get it sold on schedule, read Selling Your Home Like a Campaign.

Sell First, Buy First or Tie Them Together?

Each order trades one kind of risk for another. Nobody gets the version where everything lines up perfectly on the same Tuesday, so pick the risk you'd rather hold.

Sell First

You list, accept an offer and close. Then you shop with real money in hand. You know your proceeds to the dollar, you never carry two mortgages and your offer on the next place is clean. The catch is the gap. You may need a short-term rental, storage or a rent-back (more on that below). Two moves is annoying. It's also cheaper than two mortgages.

Buy First

You buy the next home, move once and sell the old one empty, which is easier to stage and show. The catch is cash and qualifying. You need the down payment before your equity is free, and your lender has to believe you can carry both houses. If the old place sits, so do you.

Tie Them Together

You make your purchase contingent on selling your current home, or you time two contracts so both close within days of each other. It feels like the best of both, but it has the most moving parts: two lenders and two sets of deadlines.

What Is a Home Sale Contingency?

A home sale contingency is a clause in your offer that says you'll buy only if your current home sells by a certain date. Miss the date and you can usually walk away with your deposit. The Consumer Financial Protection Bureau describes earnest money as a good faith deposit you get back when a contract ends for a permitted reason, and a contingency is exactly that kind of reason. The CFPB already urges buyers to make offers contingent on financing and a satisfactory inspection. A sale contingency is one more condition on the same list.

To a seller, your contingency is their risk. In a busy spring, a clean offer often beats it, even at a lower price. It works best when your home is already under contract, or when the seller has had the house on the market long enough to welcome any real buyer. Expect the seller to ask for short deadlines and the right to keep showing the house.

In New Jersey, the contingency language goes through the three business day attorney review period like the rest of the contract, so that's the window to tighten it.

Do Lenders Count Both Mortgage Payments?

Usually, yes, until your sale is solid. Under Fannie Mae's Selling Guide (topic dated September 2, 2026), if your current home is pending sale but won't close before the new loan, the lender counts both housing payments when it qualifies you. Fannie Mae lets the lender drop the old payment once it has two things: your executed sales contract and confirmation that your buyer's financing contingencies have cleared.

That rule explains a lot. A signed agreement on your current home isn't enough by itself. A buyer whose mortgage commitment is in hand is what frees up your borrowing power. So if you're buying with a conventional loan, the strongest moment to make your own offer is often right after your buyer clears financing. FHA, VA and portfolio loans have their own rules.

What Is a Bridge Loan?

A bridge loan is short-term money, usually borrowed against the home you're selling, that covers your down payment on the next one before the sale closes. Federal Truth in Lending rules (Regulation Z) describe a temporary or bridge loan as one with a term of 12 months or less, such as a loan to buy a new home when you plan to sell your current one within 12 months. Bridge loans that short are exempt from the federal ability-to-repay rule.

If the new mortgage is a Fannie Mae loan, the bridge loan can't be secured by the new house, and the lender has to document that you can carry the new home, the old home, the bridge loan and everything else you owe.

The HELOC Version

Some sellers use a home equity line of credit on the current house instead. The CFPB describes a HELOC as a line you borrow against your equity, usually at an adjustable rate, with a draw period and then repayment. Like any loan secured by your house, missing payments could lead to foreclosure. Either way, the question is the same: what does the bridge cost per month, and what happens if the old house takes twice as long to sell as you planned?

Can a Seller Rent Back After Closing?

Yes, if the buyer agrees. A rent-back lets you close the sale, collect your proceeds and stay in the house for a short, fixed stretch while your next place closes. It's a separate written agreement between you and the buyer, not a government program, so every term is negotiable.

A good one spells out the move-out date, the daily or monthly charge, any amount held back from your proceeds until you leave, who pays utilities, the condition the house has to be in and what happens if you're late. Talk to your insurance agent too, since you'll be living in a house you no longer own. Keep it short. If the buyer is financing a home they plan to live in, their lender has its own occupancy requirements, and a long rent-back can bump into them.

Rent-backs are the quiet hero of sell-first plans: certainty on the sale and one move instead of two. Yes, you'll still have to pack.

Worked Example: Two Hypothetical Plans

Every number here is hypothetical and rounded, except the Philadelphia transfer tax rate of 4.578% (as of October 2026). Say you own a Philadelphia house worth $500,000 with a $280,000 payoff. You want a $700,000 home with 20% down.

Your half of the transfer tax: $500,000 x 4.578% = $22,890, half is $11,445
Commission and other selling costs: $30,000
Net from the sale: $500,000 minus $280,000, $11,445 and $30,000 = $178,555
Down payment on the new home: 20% of $700,000 = $140,000

Sell first and the math is easy. The sale funds the down payment with $38,555 left over for closing costs on the purchase and the movers.

Buy first, and you need $140,000 before that equity exists, which is the bridge loan's job. Then you carry both houses. At a hypothetical $2,600 a month on the old place and $4,300 on the new one, that's $6,900 a month. Three months of overlap is $20,700, before the bridge loan's own interest and fees. How long is three months? As of September 2026, Realtor.com Economic Research put median days on market at 64 in Philadelphia County and 41 in Montgomery County. Then add the stretch from signed agreement to closing.

How Max Uses This With Clients

Max starts with one calendar, not two. He builds a net sheet for the current home first, so the down payment number is real. He also has you talk to a lender early about qualifying with and without the old payment. Then he maps the order on paper: list date, likely contract date, the buyer's financing deadline and the earliest realistic closing on the next place.

From there he picks the tool. If the sale needs to fund the purchase, he plans a sell-first launch with a rent-back written into the offer terms. If you can carry both homes, he times your offer for right after your buyer clears financing. Ready to see what your current home could bring? Start at home valuation, or see how Max sells homes and how he helps buyers.

This is general information, not legal, tax or lending advice. Confirm terms with your lender and a real estate attorney before you sign.

Maximize Your Timing.

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FAQ

What is a home sale contingency?

A home sale contingency is a clause in your purchase contract that makes buying the new house depend on selling your current one by a set date. If your sale falls through in time, you can usually exit and get your earnest money back. Sellers often see these offers as weaker, so expect to negotiate.

What is a bridge loan?

A bridge loan is short-term financing, usually secured by the home you're selling, that covers the down payment on your next home before the sale closes. Federal rules describe bridge loans with terms of 12 months or less. Your lender still has to confirm you can carry both homes plus the bridge loan.

Can a seller rent back after closing?

Yes. A seller can rent back after closing if the buyer agrees in writing. A rent-back agreement sets the move-out date, the daily or monthly charge, any money held back from your proceeds and who covers utilities and damage. Keep it short, because the buyer's lender has its own occupancy requirements.

Should you sell first or buy first?

Selling first is usually the safer order, because you know your exact proceeds and never carry two mortgages. Buying first makes sense when you can qualify for both payments or line up a bridge loan, and you'd rather not move twice. The right order comes down to your cash, your equity and your nerves.

Do lenders count both mortgage payments when you buy before selling?

Fannie Mae's lenders generally count both housing payments when your current home is pending sale but won't close first. Fannie Mae drops the old payment from the math once the lender has your executed sales contract and confirmation that the buyer's financing contingencies have cleared, as of its September 2026 Selling Guide.

Put a Number on Your Move

Talk to Max

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Put a Number on Your Move

Talk to Max

Request a Home Valuation