The Move-Up Math — Your Down Payment May Already Exist

The list price of the next house is not the number that decides whether you can move. The number that decides it is what your current house nets after the loan is paid off and selling costs come out — measured against the down payment the next house needs. Most people never run it, and a surprising share of them are further along than they think.

I'm Jeff Moran, a mortgage broker in Bluffton, South Carolina, originating since 1996, NMLS #483943, through C2 Financial Corporation.

This is arithmetic, not encouragement. It comes out badly for some households and I will show you where it does.

The number people substitute for it

Somebody scrolls listings, sees a price, and compares it against the down payment they scraped together the first time. That comparison is wrong in a specific way: you are not the buyer you were then.

The first time, the down payment came out of savings. This time there is a second source, and it has been accumulating without anybody thinking about it — every principal payment, plus whatever the market has done. It just does not look like money, because it is wearing a house.

The mistake is not optimism. It is comparing the new price against your bank balance while ignoring the asset you already own.

The actual calculation

Three lines, in this order.

Start with what the house sells for. Not what a website estimates and not what you hope. A real opinion of price from somebody who sells houses in your area, which costs nothing to obtain.

Subtract what you owe. And here is the first place people get it wrong: the payoff is not your last statement balance. Interest accrues to the day the loan is actually paid off, so the payoff figure is a little higher than the number on your statement. Ask your servicer for a payoff quote rather than reading the balance.

Subtract the cost of selling. This is the line that gets skipped, and it is the largest one. It includes whatever you agree to pay your agent, the closing costs the contract assigns to you, any transfer tax or deed stamps your state charges a seller, prorated property taxes, and the repairs that come out of the inspection.

That last item varies enormously by state, and it is worth knowing which kind you are in — who pays what at a closing, state by state, because a seller's line in one state is a buyer's line in the next.

Sale price, minus payoff, minus selling costs, equals what you walk away with.

One item runs the other way and people forget it: your escrow account gets refunded. Whatever has been sitting there for taxes and insurance comes back to you after the loan is paid off, separately and usually a few weeks later. It is not part of the closing proceeds and it is not nothing. What is actually in that account explains why the balance is what it is.

Then the second comparison, which is the one that matters

Take that walk-away number and put it next to what the next house needs.

It does not have to be twenty percent. Twenty percent avoids mortgage insurance on most conventional loans, which is a real monthly saving, but it is a threshold rather than a requirement — and putting less down while keeping cash is a legitimate choice rather than a failure. Whether twenty percent is worth it for your situation is a genuine trade with two defensible answers.

So there are three possible outcomes here, and all three are useful:

The proceeds cover the next down payment with room. The move is financially available. What remains is sequencing, which is a different problem.

The proceeds cover it exactly, or nearly. Available, but with no cushion — and a house transaction without a cushion is uncomfortable in a way that is hard to appreciate in advance.

The proceeds do not cover it. Now you know, and you know how far off you are, which is a far better position than wincing at listings for another year.

The part that is genuinely harder than it used to be

Here is the counterweight, and I would rather you get it from me than from a closing table.

Your equity can cover the down payment while the payment does not work. Those are two different tests and clearing the first says nothing about the second.

The next house is bigger, so the loan is bigger. It is being borrowed at today's rate rather than the rate you are holding. Its taxes and insurance are bigger. A household that comfortably carries its current payment can be genuinely stretched by the next one even with a large down payment, because qualifying runs on the monthly payment against your income, not on how much cash you brought.

So run both. The proceeds arithmetic tells you whether the move is available. What the monthly payment actually supports tells you whether it is comfortable. People who only run the first one are the ones who get surprised.

What this article is deliberately not about

Sequencing. Whether you buy first or sell first is a separate question with its own arithmetic, and it turns on where your down payment lives rather than on how large it is. If your down payment is the equity in the house you are selling, it is not available until that house funds — which changes the plan entirely. Buying first or selling first is that conversation, and it is worth having after this one rather than instead of it.

An illustration, so the shape is clear

Numbers below are invented to show the mechanism. They are not a quote, and the selling-cost figure is an assumption rather than a rate.

A household bought at $350,000 several years ago. Houses like theirs are now selling around $450,000, and the statement balance is about $290,000.

Sale price: $450,000. The payoff quote comes back a little above the statement balance, at roughly $292,000, because of interest to the payoff date.

Selling costs, in this illustration, come to about $31,000 — agent compensation as negotiated, the closing costs the contract puts on them, the state's transfer charge, prorated taxes, and a short repair list from the inspection. Yours will be a different number, and what your state charges a seller is not what it charges the seller next door in another state.

Walk-away: roughly $127,000. Plus an escrow refund arriving separately a few weeks later.

The house they keep wincing at lists at $550,000. Twenty percent of that is $110,000 — so the proceeds cover it, with about $17,000 left for moving costs and the first round of things a new house needs.

And then the second test. They would be borrowing $440,000 at today's rate rather than $290,000 at the rate they hold, with larger taxes and larger insurance. Whether that payment fits their income is a completely separate question from whether the down payment exists — and it is the one that decides the file.

On these invented facts, the down payment was never the obstacle. It had been sitting in the house for years. The payment is the real question, and it is answerable in an afternoon.

What to do now

Get a payoff quote from your servicer. Not your statement balance. It takes one call.

Get a real opinion of price from an agent who sells in your neighbourhood. Also free, also fast.

Subtract, then compare. Those two numbers plus an honest estimate of selling costs give you the walk-away figure, and the walk-away figure is the one that tells you whether this is a real conversation or a someday conversation.

Then price the payment. Run your numbers — live pricing for your scenario, no credit pull, no account, nobody calls you. Bring the price you are considering and what you expect to put down, and you will see the payment before anyone talks to you about it.

Nothing here is a loan approval, a denial, or a commitment to lend, and none of it is tax advice. What you net on a sale depends on your contract, your agent agreement and your state, and is worth confirming with the professionals handling that side.

Common questions

How much will I actually walk away with when I sell my house?

Take the sale price, subtract the loan payoff, then subtract the cost of selling. The payoff is not your statement balance — interest accrues to the day the loan is actually paid off, so ask your servicer for a payoff quote. Selling costs include what you agree to pay your agent, the closing costs your contract assigns you, any transfer tax or deed stamps your state charges a seller, prorated taxes and inspection repairs. Your escrow balance is refunded separately, a few weeks after closing.

Can I use the equity in my house as the down payment on the next one?

Ordinarily yes, and for many households several years into a home it is the largest source available. What matters is the net figure rather than the equity on paper: sale price minus payoff minus selling costs is what actually arrives. The separate question is timing, because equity in a house you are selling is not spendable until that sale funds, which shapes whether you can buy before you sell.

Is my statement balance the same as my mortgage payoff?

No, and the difference catches people out. Interest accrues to the date the loan is actually paid off, so a payoff quote comes back somewhat higher than the balance printed on your most recent statement. Servicers provide payoff quotes on request, and using the quote rather than the statement is the difference between an estimate that holds up and one that is short.

Do I need twenty percent down to move up?

No. Twenty percent avoids mortgage insurance on most conventional loans, which is a real monthly saving, but it is a threshold rather than a requirement. Putting less down and keeping cash in reserve is a legitimate choice, particularly when a move involves moving costs and the immediate needs of a new house. Which is better depends on how much of that cushion you would actually use and how long you plan to stay.

My equity covers the down payment. Does that mean I can afford the move?

Not necessarily, and these are two separate tests. Qualifying runs on the monthly payment measured against your income, not on how much cash you bring to closing. The next house usually means a larger loan at today's rate, with larger taxes and insurance, so a household comfortable with its current payment can still be stretched by the next one. Run the payment separately from the proceeds.

Should I sell first or buy first?

That is a different question from this one, and it turns on where your down payment lives rather than how large it is. If the money for the next purchase is the equity in your current house, it is not available until that sale funds, which usually narrows the choice to selling first or borrowing against the equity in the meantime. If the down payment already sits in savings separate from the house, buying first is genuinely on the table.