Buying and Selling a Philly Home at the Same Time

How do you buy and sell a home in Philly at the same time?

Short version: you're picking which risk you'd rather carry, because there's no path with none. If the equity in your current house is your next down payment, you can make your offer contingent on your sale, borrow against the house before you list it, or sell first and negotiate a short rent-back. In Philadelphia, also budget the transfer tax twice: your customary half as a seller, 2.289% of the price, and again as a buyer if the next home is in the city too.

The real question isn't which comes first

Most people frame this as "buy first or sell first," and that's not really the decision. The decision is whether you can carry both housing payments for a few months if your house takes longer to sell than you'd like. If you can, every option is open. If you can't, you've got two, and it's better to know that before you fall for a house than after.

Your lender answers that question for you, and the rule is stricter than people expect. Under Fannie Mae's Selling Guide (updated September 2, 2026), your current home's full payment counts against you when you qualify for the new loan unless you hand the lender an executed sales contract on your house and proof that your buyer's financing contingencies have cleared. A listing doesn't count. An offer you're "about to accept" doesn't count. If you're thinking about keeping the old place as a rental instead, the same guide no longer accepts a signed lease on a departing residence: the lender estimates rent from an appraisal or market data, counts 75% of it, and if you've been a landlord for less than a year, wants six months of the old home's payment sitting in reserves. That's why the first call in this process is to your lender, not to us, and why getting pre-approved the right way matters even more when you already own.

Once you know your number, there are three realistic ways to run it. The first is a sale contingency. Pennsylvania agents write it with one of three PAR addenda: Sale and Settlement of Other Property when your house isn't sold yet, Settlement of Other Property when it's already under agreement and just needs to close, and a version with a Right to Continue Marketing, which lets the seller keep showing their house and gives you a window to drop your contingency or step aside if a better offer shows up. What we tell clients is to get your own house under agreement before you write the offer. A seller reads "my house is sold, it just needs to settle" very differently from "I still need to find a buyer," and in a multiple-offer situation the second one usually loses.

The second path is borrowing the down payment against the house you already own, through a home equity line of credit or a bridge loan. The HELOC has to be opened before you list, because lenders generally won't open one on a house that's on the market. A bridge loan typically runs around 12 months and gets paid off from your sale proceeds, and it costs more than a regular mortgage, so ask for the all-in number, fees included, before you count on it. Either one solves the down payment. Neither one solves the qualifying problem above, so both payments can still land in your ratios.

The third path is selling first. You list, accept an offer, and negotiate either a later settlement date or a post-settlement occupancy agreement, the formal name for a rent-back. That makes you a buyer with cash in hand and no contingency, which is the strongest offer you can write. The tradeoff is a short window to find the next place, plus the cost of a second move if you land somewhere temporary. Keep rent-backs short, because the buyer's lender expects them to move in, and put the daily rate, the end date, insurance and who covers damage in writing.

The Philly math people miss

Transfer tax is where a city-to-city move gets expensive fast. Philadelphia's combined rate is 4.578%, split by custom between buyer and seller. Sell a $400K Philly house and your half is $9,156. Buy a $550K Philly house and your half is $12,590. That's $21,746 in transfer tax alone before title, commissions or moving trucks, and it comes out of the same equity you were counting on for the down payment. Our breakdown of what you actually net selling a Philly home walks through the seller side line by line, and the Philly buyer closing costs guide covers the purchase side. If the next house is in Bucks County, the rate there is 2% total, 1% to the state and 1% local, usually split between buyer and seller.

The other one people miss is the Homestead exemption. It doesn't follow you from one Philly house to the next. The City takes $100,000 off your home's taxable value, worth up to $1,399 a year, but only once you apply for the new address, and the deadline for the 2027 tax bill is December 1, 2026. Homes still under a 10-year abatement aren't eligible.

Where this whole plan breaks is when you're unsure what your house is worth or it needs work before it'll sell well. In that case, sell first. Writing a contingent offer on a guess about your own price is how people end up renegotiating two deals at once.

Frequently Asked Questions

Can I make an offer on a Philly house contingent on selling mine?

Yes. Pennsylvania agents use a PAR addendum for it: Sale and Settlement of Other Property if your house isn't sold yet, or Settlement of Other Property if it's already under agreement. Sellers accept the second far more readily, and a seller may add a right to keep marketing their home while your contingency is open.

Will my lender count both mortgage payments?

Usually, yes. On a Fannie Mae loan, your current payment stays in your debt-to-income ratio unless you provide an executed sales contract on your house and confirmation that your buyer's financing contingencies have cleared. A listing alone doesn't remove it.

How long can I rent back my house after I sell it?

Usually weeks, not months, because the buyer's lender expects them to move in. Whatever you agree to, put the end date, the daily rate, insurance and responsibility for damage in a written post-settlement occupancy agreement.

Do I have to reapply for the Homestead exemption at my new Philly house?

Yes. The exemption is tied to the property and your deed, so it doesn't transfer from your old house. Apply for the new address by December 1, 2026 to get it on the 2027 tax bill.

If you're working out whether your equity can carry the next purchase, start with what your house will realistically sell for. Get a home value from our team and we'll walk through which of the three paths fits your numbers.