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By Alex Diaz · How we calculate this
Selling a home typically costs 8% to 10% of the sale price once agent commissions, closing costs, and staging are factored in, so on a $500,000 house that's $40,000 to $50,000 coming off the top before you see any proceeds. Since downsizing is a one-time transition, the calculator weighs the total cost against roughly three months of your budget rather than a single month's income.
These key factors affect downsizing affordability
Selling costs on your current home
Selling costs are the first surprise for most downsizers. Between agent commissions, closing costs, staging, and whatever repairs it takes to get top dollar, expect roughly 8% to 10% of the sale price to disappear before you see a dollar of proceeds, which on a $500,000 house works out to $40,000 to $50,000. Those costs matter because they eat directly into the equity you're counting on to fund the smaller home, so don't count the sale price itself as spendable.
You may owe less in capital gains tax than you'd guess
If you've owned and lived in the home as your primary residence for at least two of the last five years, the IRS lets you exclude up to $250,000 of profit from capital gains tax as a single filer, or $500,000 for a married couple filing jointly. For anyone who's owned a home for decades in a market that's appreciated well past that threshold, though, the tax on the excess is worth running past a tax preparer before assuming every dollar of the sale is yours to spend on the next place.
The gap between what you net and what you need
Downsizing only frees up cash if your net proceeds from selling comfortably clear the new smaller home's price plus moving costs, and that's not guaranteed. In expensive or land-constrained markets, a smaller home can cost nearly as much per square foot as your current one, especially if it's newer construction or in a more desirable location. The arithmetic (sale price, minus selling costs, minus new home price, minus moving costs) is worth doing on paper rather than assumed.
Property tax rules can quietly help or hurt the math
Some states let older homeowners carry a lower assessed value to a new home instead of resetting it at the new purchase price. California's Proposition 19, for example, lets homeowners 55 and older transfer their existing property tax base to a replacement home anywhere in the state, up to three times. Check your own state's rules before assuming a smaller home automatically means a smaller tax bill; a fresh assessment on a home you've owned only a short time can sometimes cost more than staying put would have.
Decluttering, moving, and transition costs
The move itself adds up too. Decluttering decades of belongings, hiring movers, renting short-term storage for the gap between homes, or covering temporary housing if the timing doesn't line up are all easy to underestimate, and together they commonly add several thousand dollars beyond the real estate transaction itself.
How to use your results
- Calculate your net proceeds (sale price minus commissions and closing costs) before assuming downsizing frees up cash.
- Include moving, storage, and decluttering costs, not just the difference between the two home prices.
- Time the sale and purchase carefully to avoid paying for two homes - or temporary housing - at once.
Ways to make downsizing more affordable
- Sell your current home before buying the next one to avoid carrying two mortgages or bridge financing costs.
- Sell or donate belongings you won't need in a smaller space instead of paying to move and store them.
- Negotiate a rent-back agreement with your buyer if you need extra time to find your next home.
- Get a pre-listing home inspection to catch repair issues early instead of facing surprise costs during negotiations.
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