Here is the short version. A couple selling a $500,000 family home and buying a $350,000 condo can watch roughly $43,000 disappear between the two closings, in commissions, transfer taxes, movers, overlap on two sets of bills, and the buy-side costs on the new place. That is nearly nine cents of every dollar of the sale price, and none of it shows up in the cheerful arithmetic people do at the kitchen table, which usually stops at "we sell for five hundred, we buy for three fifty, we pocket one fifty." You will not pocket one fifty. This piece walks the whole gap, line by line, with the sources for each number, so you can run the same math on your own house before you list it.
One note before the lines. Every dollar figure in the worked example is an assumption you should replace with your own quotes and your own tax bills. The rules and rates behind them, the commission changes, the transfer tax, the capital gains exclusion, come from the primary sources linked as we go.
The commission, after the 2024 settlement
The largest single line is still the agents. What changed in August 2024 is how that money gets negotiated, not that it exists. Under the National Association of Realtors settlement, which per NAR's own settlement FAQ took effect August 17, 2024, offers of compensation to a buyer's agent can no longer be published on the MLS, buyers sign a written agreement with their agent before touring homes, and, in NAR's words, compensation "is not set by law and is fully negotiable."
In practice, sellers still frequently agree to cover some or all of the buyer's agent fee to keep the pool of buyers wide, but it is now a line you negotiate rather than a default you inherit. For the worked example we will assume a negotiated 5 percent total, $25,000 on a $500,000 sale, split between the two sides. Yours may land lower, especially if you pay only your own agent and let the buyer handle theirs. Get the number in writing in the listing agreement, and ask directly what happens to the fee if the buyer arrives without an agent.
Transfer taxes, the line almost nobody prices in advance
When the deed changes hands, most states and many counties take a percentage. Pennsylvania is a clean example because the state publishes it plainly: the Pennsylvania Department of Revenue says its realty transfer tax "is imposed at a rate of 1 percent on the value of real estate" transferred by deed, that both grantor and grantee are jointly liable for it, and that counties collect an additional local transfer tax on top. In much of Pennsylvania the combined bill runs 2 percent, customarily split between buyer and seller, though custom is not law and it is negotiable like everything else at a closing.
Two percent of $500,000 is $10,000, and in our example the sellers pay half on the sale, then pay a buyer's share again on the $350,000 condo. Your state may charge far less, or nothing. The only honest move is to look up your own state and county before you count your proceeds, because a 2 percent surprise on a large sale is a vacation's worth of money.
Movers, and the months you own two homes
These two lines are smaller and sneakier. A local move of a full four-bedroom house of furniture is commonly a few thousand dollars; we will assume $4,500 and note that a cross-country move can triple it. Get written estimates from more than one company, and get them after a walk-through, not over the phone.
The overlap is the one people forget entirely. Closings rarely line up to the day. If you take possession of the condo six weeks before the house sale closes, you are paying property taxes, insurance, and utilities on both, and heating an empty house in winter besides. Two months of doubled carrying costs on our example home runs about $2,900. If the timing gap needs bridge financing, add its interest here too. We assumed clean timing and no bridge loan, which is the optimistic case.
The capital gains exclusion, which usually saves you and sometimes does not
Now the good news line. The IRS, in Topic 701, Sale of Your Home, says a qualifying seller "may qualify to exclude up to $250,000 of that gain from your income, or up to $500,000 of that gain if you file a joint return." The tests are ownership and use: you meet them if you owned the home and used it as your residence for at least 24 months, meaning 2 years, out of the 5 years ending on the sale date. The same page adds that you are generally not eligible if you excluded gain from another home sale in the two years before this one.
Run your own gain honestly. Say the house was bought in 1998 for $130,000 and you can document $50,000 of improvements, a new roof, the addition, the remodeled kitchen. Your basis is $180,000 and your gain on a $500,000 sale is $320,000. A couple filing jointly excludes all of it and owes nothing. A widow or widower filing single two years after losing a spouse excludes $250,000 and has $70,000 of taxable gain, which at a 15 percent capital gains rate is $10,500. Same house, same sale, very different bill. If you are recently widowed, the timing of the sale relative to your filing status is worth a conversation with a tax professional before you sign anything, and receipts for old improvements are worth digging out of the filing cabinet.
The whole example, netted out
Here is the ledger for our couple, who owe no capital gains tax. Sale price $500,000. Commission $25,000. Seller's share of transfer tax on the sale, $5,000. Movers $4,500. Two months of overlap $2,900. Buy-side costs on the $350,000 condo, meaning their share of that transfer tax plus title and recording, about $6,000. Add it yourself: $25,000 plus $5,000 plus $4,500 plus $2,900 plus $6,000 comes to $43,400. Subtract that and the $350,000 condo from the $500,000 sale and the cash actually freed is about $106,600, not the $150,000 of kitchen-table math.
Is it still worth it? Usually, yes, because the yearly line moves too. Suppose the family home costs $14,000 a year to carry in taxes, insurance, utilities, and upkeep, and the condo costs $8,500. The move frees $106,600 once and about $5,500 every year after. You can run your own version below; the calculator opens with this example, and a negative price means money received.
A fair way to decide
The arithmetic will usually favor the smaller place over ten years. What it cannot price is the workshop, the garden, or the bedroom the grandchildren use in July, and those are real values even though no calculator holds them. What the math can do is stop the move from being decided on a wrong number. Get a listing agent's written fee proposal, your state's transfer tax rate, two mover estimates, and your own basis with receipts, and rebuild the ledger with real figures. If the second car is part of the same rethink, we walked that math the same way. A decision this size deserves an unhurried month and a tax professional's hour, not an afternoon and a rule of thumb.
