How much does a car really cost?
The sticker price is roughly half of what the car costs you.
Between the income tax you paid to earn the purchase price, sales tax, financing interest, and five years of insurance, maintenance, and fuel, the car you 'paid $40,000 for' costs closer to $70,000 of pre-tax life.
- Ownership costs (insurance, maintenance, fuel) are modeled over a 5-year holding period using national averages — your actual costs will vary by state, driving habits, and vehicle.
- Financing interest and opportunity cost are both shown as separate 'cost of capital' framings — never summed together into one headline number.
- Depreciation is net of an assumed resale value at the end of the holding period, not the full purchase price.
- Sales tax applies at the standard rate for your county on the purchase price.
Adjust assumptions
to cover a car purchase
The same money in a broad index fund over the holding period. Never added to the figure above — it is what you gave up, not what you paid.
- Income tax (federal, FICA, state)30%$39,536
- Ownership costs37%$48,944
- Sales tax2%$3,300
- Fees0%$319
- Car purchase30%$40,000
- Income tax (federal, FICA, state)
- Ownership costs
- Sales tax
- Fees
- Car purchase
Data for nerdssources, confidence, assumptions
Where each number comes from
| Component | Amount | Confidence |
|---|---|---|
| Item price | $40,000.00 | Your figureHigh confidence. You supplied this, so it is exact by definition. |
| Sales tax | $3,300.00 | JurisdictionalMedium confidence. The right jurisdiction, but special districts within it can vary — bounded, and we know the range. |
| Fees | $319.00 | Population averageLow confidence. A group statistic standing in for one person; your own costs may differ substantially. |
| Ownership costs | $48,944.12 | Population averageLow confidence. A group statistic standing in for one person; your own costs may differ substantially. |
| Income tax to earn it | $39,536.15 | StatutoryHigh confidence. This number is the law — federal, FICA and state tax rates are published rates, so the only real risk is staleness. |
Jurisdiction applied
- State:
TX - Sales tax county:
Harris County (Houston) - Local income tax: none selected
Assumptions
- Ownership costs (insurance, maintenance, fuel) are modeled over a 5-year holding period using national averages — your actual costs will vary by state, driving habits, and vehicle.
- Financing interest and opportunity cost are both shown as separate 'cost of capital' framings — never summed together into one headline number.
- Depreciation is net of an assumed resale value at the end of the holding period, not the full purchase price.
- Sales tax applies at the standard rate for your county on the purchase price.
Sources
- AAA — Your Driving Costs (annual ownership cost averages) as of 2026-01-01
The loan
$624/mo$32,000 borrowed at 6.39% over 5 years, after $8,000 down.
Your position in the tax system
29.65% on the next dollarEvery extra dollar you earn is taxed at your marginal rate, not your average one — which is why a purchase costs more to fund than a paycheck stub suggests.
Marginal rates are read in gross-income terms: below the standard deduction an extra dollar of pay adds nothing to taxable income, so the true rate there is 0%, not the lowest bracket's. Excludes pre-tax deductions (401(k), HSA), which would lower all three.
Same purchase, different state
TX is #1 of 30Only income tax and sales tax move — the sticker price is held constant, so this is the part of the cost your address actually controls. Spread across all 30: $21,508, from Texas to California.
- Texasyou$132,099
- $153,607
Click a state name to compare against somewhere else.
Where every dollar goes
30% never reaches youThe $132,099.27 you must earn, followed to where it lands. Hover a band to isolate it.
- Federal income tax$30,767.82
- FICA (Social Security + Medicare)$8,768.33
- Car purchase$40,000.00
- Sales tax$3,300.00
- Fees$319.00
- Ownership costs$48,944.12
Each tax layer is the extra tax this purchase causes — that layer's tax at your income subtracted from its tax at your income plus the gross-up — so bracket boundaries the purchase straddles are handled correctly rather than smoothed over with an average rate.
Is a raise actually a raise?
you keep 70%A raise arrives on top of everything you already earn, so it is taxed at your marginal rate — not the average rate on your whole salary.
Federal, FICA, state and any local income tax — no pre-tax deductions, benefit changes, or payroll withholding quirks, all of which move the real figure. Moving into a higher bracket never taxes the income below the threshold: only the dollars above it pay the higher rate.
Where this differs most
States whose answer is genuinely different from the national picture — either near the top or bottom of the range, or structurally unusual. States that land mid-pack are covered by the figures above.
Keep going
- AAA — Your Driving Costs (annual ownership cost averages)— as of 2026-01-01