Household
The transportation budget: one line for everything that moves you
Transportation is usually scattered across several accounts — car payment, fuel, insurance, transit, the occasional rideshare. Combined, it is one of the largest household lines and the one most likely to silently exceed the 15% guideline.
- Everything combined
Car, fuel, insurance, transit and rideshares as one dated line.
- The 15% rule
Transportation should stay under 15% of take-home income.
- Dated annuals
Insurance, registration and servicing are funded monthly.
- The rideshare cap
The convenience line gets a hard cap — it is the quiet leak.
The combined line
| Line | Monthly |
|---|---|
| Car payment | $350 |
| Fuel | $140 |
| Insurance + registration | $130 |
| Maintenance (funded) | $60 |
| Transit | $80 |
| Rideshare cap | $50 |
| Total | $810 |
Testing the 15% rule
- Total every transportation cost from the last three months.
- Compare to 15% of take-home income.
- If over the line, the levers are ordered: rideshare cap, car payment, car size.
The ownership math
The "cheap" used car still carries insurance, fuel and maintenance. Compare total ownership against the transit alternative on the same calendar before the purchase decision.
For two-car households, the second car is often the budget line worth questioning hardest — it is usually the one with the worst cost-per-mile.
Frequently asked questions
How much should I spend on transportation?
Under 15% of take-home income for everything — car, fuel, insurance, transit and rideshares combined.
What transportation costs do people forget?
Insurance renewals, registration, maintenance and the rideshare drip — the annuals and the convenience line.
How do I reduce transportation costs?
In order: cap rideshares, shop the insurance annually, fund maintenance monthly, then question the car itself.
Is owning a car cheaper than transit?
It depends on the car and the city — run both as dated lines for three months and the answer appears with numbers.
One line, every way you move
Free dated transportation planning.