First-time buyers budget for the mortgage payment and are then surprised, usually within eighteen months, by how much more the house costs. The mortgage is typically around 60% of the total. Here is the other 40%.
#Property tax
In the US this runs 0.3% to 2.5% of assessed value annually depending on the state, with a national average near 1.1%. On a $450,000 home at 1.1% that is $4,950 a year, or $413 a month.
Two things to watch. Assessments are periodically revised upward, often after a sale resets the recorded value, so the previous owner's tax bill may understate yours substantially. And in many jurisdictions property tax rises faster than general inflation because it funds services with rising labour costs.
#Homeowners insurance
Typically $1,200 to $3,500 a year, varying enormously by region. Coastal, wildfire and flood-exposed areas have seen dramatic increases, with some markets doubling within a few years, and in the most exposed areas private insurers have withdrawn entirely.
Standard policies exclude flood. Flood insurance is separate and, in a designated flood zone, mandatory with a mortgage.
#Maintenance and repairs
The planning convention is 1% of home value per year, averaged over time. On a $450,000 home that is $4,500 annually.
The figure feels high in year one and low in year fourteen, because maintenance is lumpy rather than smooth. A roof lasts 20 to 30 years and costs $12,000 to $30,000. An HVAC system lasts 15 to 20 years and costs $6,000 to $14,000. A water heater lasts 10 to 15 years and costs $1,200 to $3,500. Exterior paint is $5,000 to $15,000 every 7 to 10 years.
None of these are optional and none of them are emergencies — they are scheduled expenses that simply arrive without an invoice. Homes over forty years old justify 1.5% or more.
#HOA or condo fees
Where applicable, $200 to $700 a month is common, and considerably more for buildings with amenities. Two specific risks: fees rise, often faster than inflation, and special assessments for major works can arrive as five-figure demands with limited notice.
Before buying into any association, read the last three years of minutes and the reserve study. An underfunded reserve fund is a special assessment waiting to happen.
#The costs that only appear at the transaction
Buying: 2% to 5% of the purchase price in closing costs, plus inspection, appraisal and moving.
Selling: 5% to 6% agent commission in most US markets, plus transfer taxes, staging and the repairs a buyer negotiates after inspection.
Round trip, budget 8% to 10% of the property value. On a $450,000 home that is $36,000 to $45,000 that must be earned back through appreciation and equity before you are level.
#The opportunity cost nobody lists
A $90,000 down payment invested at 7% would be worth roughly $177,000 after ten years. That forgone return is a genuine cost of owning and it is the single largest omission from most rent-versus-buy comparisons.
This is why the rent vs buy calculator compares total net worth rather than monthly payments. A buyer accumulating equity and a renter accumulating a portfolio are both building wealth; the question is which builds more.
#Putting it together
On a $450,000 home with 20% down at 6.4%:
| Line | Monthly |
|---|---|
| Principal and interest | $2,251 |
| Property tax at 1.1% | $413 |
| Insurance | $175 |
| Maintenance at 1% | $375 |
| Total | $3,214 |
The mortgage payment is 70% of the carrying cost here, and that excludes HOA fees and amortised transaction costs. Comparing $2,251 against a $2,200 rent would tell you owning is roughly break-even. Comparing $3,214 tells you it costs 46% more per month — with the offset that a portion builds equity.
#What this does not mean
It does not mean buying is a bad decision. It means the decision should be made with the real number.
Owning still offers a fixed payment while rent compounds, forced savings through amortisation, security of tenure, and the freedom to change the property. Those are worth a great deal to many households. They are simply worth evaluating against $3,214, not $2,251.
Frequently asked questions
Is 1% of home value a realistic maintenance budget?
It is the standard planning figure and holds up reasonably over a long horizon for a home in decent condition. Newer homes may run below it for the first decade; homes over forty years old, or in harsh climates, justify 1.5% or more.
Do these costs apply to condos too?
Partly. Exterior maintenance is covered by the HOA fee, so your direct maintenance budget is lower — but the fee itself, plus the risk of special assessments, usually offsets the difference. Budget the HOA fee plus about 0.5% of value for interior systems and appliances.
How should I save for lumpy repairs?
Set up a separate account and transfer a fixed monthly amount equal to 1% of home value divided by twelve. When the roof needs replacing, the money exists and the repair is an inconvenience rather than a crisis.