The mortgage payment is the number most people focus on when thinking about buying a home. It is not, however, the number that determines whether homeownership is affordable. The full picture includes property taxes, homeowners insurance, maintenance, utilities, and in many cases HOA fees — costs that can add $500 to $2,000 or more per month depending on where the home is located.

A Bankrate analysis found that the average annual hidden cost of homeownership in the United States is approximately $21,400 beyond the mortgage payment. That figure is an average — the actual number varies substantially from state to state, and in some cases from county to county within the same state.

Where property taxes hit hardest

Property taxes are the largest variable cost in homeownership and the one that varies most dramatically by location. New Jersey carries the highest effective property tax rate in the country at approximately 2.49% of home value annually. On a $400,000 home, that is roughly $9,960 per year — more than $800 per month — in property taxes alone.

At the other end of the spectrum, Hawaii has an effective rate around 0.28%, which on the same $400,000 home translates to approximately $1,120 per year. The difference between the highest and lowest taxing states on an identical home can exceed $8,000 per year.

Illinois, Connecticut, and New Hampshire round out the highest-taxing states, while Alabama, Colorado, and Louisiana are among the lowest. These differences persist regardless of home price — a buyer in a high-tax state pays substantially more than a buyer in a low-tax state even when purchasing homes at the same price.

Insurance costs by region

Homeowners insurance premiums reflect local risk — hurricane exposure along the Gulf Coast and Atlantic seaboard, wildfire risk in the West, tornado frequency in the Great Plains, and flood risk in coastal and low-lying areas. Florida carries the highest average annual premium at approximately $4,200 per year, driven primarily by hurricane risk and a challenging insurance market. Oklahoma and Texas follow due to severe storm and tornado exposure.

In lower-risk states — Oregon, New Hampshire, Vermont, and Delaware — annual premiums average closer to $900. For buyers in high-risk states, insurance cost is a meaningful component of the monthly housing budget that many calculators understate or ignore entirely.

It is worth noting that insurance markets in high-risk states have been under significant pressure in recent years. Several major insurers have reduced or eliminated coverage in parts of Florida and California, which has driven some buyers toward state-run insurers of last resort at higher costs. This is a factor worth researching specifically for the target area before purchasing.

Maintenance — the cost most underestimated

Financial planners commonly reference a rule of thumb that homeowners budget 1% to 2% of a home's value annually for maintenance and repairs. On a $350,000 home, that is $3,500 to $7,000 per year — $290 to $580 per month — set aside before a single repair is needed.

The appropriate rate depends heavily on home age. New construction carries the lowest maintenance burden, typically closer to 0.5% annually due to warranty coverage and newer systems. Homes over 20 years old see the highest maintenance costs as HVAC systems, roofs, water heaters, and major appliances approach or reach the end of their useful lives.

Unlike mortgage payments and property taxes, maintenance costs are unpredictable. A roof replacement, HVAC failure, or foundation issue can run $10,000 to $30,000 in a single year. Buyers who budget only for the mortgage payment and predictable costs frequently find themselves financially exposed when the first major repair arrives.

The full monthly number — what to calculate

A complete picture of monthly homeownership cost includes: the mortgage principal and interest payment, property taxes divided by 12, homeowners insurance divided by 12, a maintenance reserve (typically 1% to 2% of home value annually divided by 12), HOA fees if applicable, and average utility costs for the area.

For a $400,000 home in a typical market, these components together often add $800 to $1,500 per month beyond the mortgage payment itself. In high-tax, high-insurance states like New Jersey, Florida, or Texas, the total beyond the mortgage can exceed $2,000 per month.

The Neighborhood Reality Check tool on this site calculates this full number using state-level data for property taxes, insurance, and utilities — showing the real monthly cost broken down line by line for any purchase price and down payment combination.