Buying a Home

The cost of a house is not the price of the house

A mortgage payment is a fraction of what owning a home costs. Property tax, insurance, PMI if you put less than 20% down, HOA fees in many areas, higher utilities for a bigger space, and the maintenance reserve that almost everyone underestimates. Adding these together typically increases the true monthly cost by 30% to 50% over the principal-and-interest payment alone.

The traditional advice — "buy as much house as you can afford" — was written for a different era of housing and labor. The safer modern math is the opposite: find the house you can comfortably afford with six months of full housing cost held in reserve. That cushion is what separates a stressful homeownership decade from a stable one when something goes wrong: a job loss, a roof, a hospital bill.

True monthly cost vs. mortgage payment

Principal and interest is the number most calculators show. Add to it: property tax (often 1–2% of home value per year, divided by 12), homeowner's insurance, PMI if applicable, HOA fees, and a maintenance reserve. A common rule of thumb is 1% of the home's value per year for repairs and replacements, which sounds high but averages out across years with new appliances, roofs, HVAC, and the occasional disaster.

On a $400,000 home with a $320,000 mortgage at 7%, the principal and interest is about $2,130. Property tax, insurance, and maintenance reserve typically add another $700–$900. The real monthly housing cost is closer to $2,900 — meaningfully different from what affordability calculators that only model the mortgage will show.

Down payment math worth reconsidering

Twenty percent down avoids PMI, which is real money — typically 0.3% to 1.5% of the loan annually. But putting down less and investing the difference can come out ahead in some markets, especially when down-payment cash would otherwise sit in low-yield savings for a year or more before the purchase.

The bigger question is whether putting 20% down strips your reserves. A 10% down payment with six months of mortgage saved is usually safer than 20% down with no cushion behind it.

What to ask before you make the offer

How old is the roof, the HVAC, the water heater? These are the four-and-five-figure surprise expenses. Are there outstanding HOA assessments? What did the previous year's property tax bill actually say (not what the listing claims)? Is the home in a flood zone or wildfire risk area? Insurance markets have shifted dramatically in some regions — get a quote before you're under contract.