The monthly cost of owning a home, explained
“How much house can I afford?” is really two questions. The first is what a lender will approve, which only a lender can answer. The second is what owning a specific home will cost you every month, which you can work out yourself. This breakdown handles the second question. It turns a home price into the monthly pieces you will actually pay, so you can compare homes, loan terms and locations on equal footing before you talk to a lender.
The five parts of a monthly housing cost
- Principal and interest. The loan payment itself, calculated with the standard amortization formula from the loan amount (price minus down payment), the interest rate and the term.
- Property tax.Home price × tax rate ÷ 12. In Virginia, real estate taxes are local taxes administered by cities, counties and towns, according to the Virginia Department of Taxation (as of September 2026), and the department publishes a survey of local tax rates. The state buttons load a starting rate; replace it with the rate for the locality you are looking at.
- Homeowners insurance. The monthly share of your annual premium. Lenders commonly collect it, along with property tax, through an escrow account, so you pay in monthly installments instead of lump sums.
- HOA dues. If the home is in a community with a homeowners or condo association, enter the monthly dues. These are usually paid to the association, not the lender, but they are part of what the home costs you each month.
- Mortgage insurance. The CFPB explains that private mortgage insurance may be required on a conventional loan with less than 20 percent down, and that it protects the lender, not you (as of September 2026). The breakdown adds an estimate when your down payment is below 20 percent.
How to use the breakdown well
Change one input at a time. Moving the down payment across the 20 percent line shows the mortgage insurance line appear or disappear. Switching between a 15-year and a 30-year term shows the trade-off between a lower monthly payment and more total interest. Changing the tax rate shows how much location matters, even at the same price. HOA dues are easy to forget when browsing listings, so it helps to add them before you compare two homes.
Interest rates depend on the borrower and the loan. The CFPB’s Explore Interest Rates tool shows how credit score, down payment, loan term and loan type can affect the rates lenders quote. Plug a rate from there, or from a lender, into the breakdown for a more realistic picture.
How lenders think about affordability
A monthly cost is not the same as an approval. Lenders look at your debt-to-income ratio, among other things. The CFPB describes it as all your monthly debt payments divided by your gross monthly income. Lenders and loan programs set their own limits, so we do not suggest a number. After you apply, the lender must send a Loan Estimate within three business days, and the CFPB’s Buying a House guide walks through each stage from shopping to closing.
A worked example
The breakdown opens on a $400,000 home price. From there it takes your down payment percentage to find the loan amount, runs the amortization formula for the term you pick, applies the tax rate to the price and divides by 12, then adds your insurance, HOA dues and mortgage insurance if it applies. The total is the monthly cost of owning that home under those assumptions.
One-time costs sit outside the monthly view. On the real estate side, VroomBrick charges a 1% technology fee, and the comparison we publish uses that same $400,000 price:
Worked example
On a $400,000 home, a 1% technology fee is $4,000. If a seller's agent charged 3%, that would be $12,000, a difference of $8,000. Commissions are negotiable, so your number depends on what you'd have paid.
Limits of any cost estimate
This is an educational estimate, not a quote or lending advice. VroomBrick is a technology platform, not a brokerage and not a lender. For a deeper look at loan types, points and closing costs, use the mortgage and affordability calculator. To see how offer price, down payment and closing costs interact before you write an offer, try the offer simulator.