Repair Budget Calculator

Why this comes up

Repairs feel like surprises even when they're predictable in aggregate, and a specific known repair coming up, a timing belt, brakes, a suspension component, adds a real deadline on top of the ongoing routine reserve. This engine separates the two: a steady monthly reserve for the unpredictable stuff, plus a targeted contribution to fund the known repair by the date it's actually due.

How we calculated this

The routine reserve target is your annual repair estimate divided by twelve. For the known repair, we take what's still needed after your current savings and divide it by the months remaining until it's due, then add that to the routine reserve for a combined monthly target.

Worked example, using this page's own defaults ($800/year routine estimate, $1,200 known repair due in 4 months, $200 already saved): the combined monthly target comes out well above the routine figure alone, run the calculator above to check your own numbers.

What this means

• A repair budget makes the cash-flow burden visible before you're comparing it against a replacement payment, see it here first, not as a surprise decision point.
• If the known repair's funding window is zero months and there's still a gap, that gap needs to come from somewhere else immediately, not from a reserve you haven't built yet.
• This is a reserve-planning tool, not a verdict on whether to actually make the repair, see Maximum Repair Cost Before Replacing for that threshold once you have a real quote.

Limitations

Repair estimates are your own planning figures, not a reliability prediction for your specific vehicle. See Methodology.

Methodology

This engine is built on Vehicle Economics' ownership total cost model: every ownership cost, depreciation, financing, fuel, insurance, maintenance, repairs, and fees, summed over your horizon. See Methodology for the full detail.

Next decision

• Maximum Repair Cost Before ReplacingSee the repair-cost threshold that would flip your keep-or-replace decision.