Flat Rate Pay Calculator — Book Hours to Real Wage
Flat rate pay pays you the book time published for a repair, not the time the repair actually takes. Gross pay is the flat rate multiplied by billed hours; your effective hourly rate is that gross divided by the hours you were actually on the clock, and efficiency is billed hours divided by clock hours. Beat book time and the effective rate rises above the flat rate; lose hours to diagnostics, parts waits or comebacks and it falls below.
Flat rate employees are still covered by minimum wage for all hours worked, and by overtime unless the FLSA section 7(i) retail commission exemption applies.
How flat rate pay works
Flat rate pay ties earnings to the job, not the clock. Every repair carries a published labor time — the “book time” from a guide such as Mitchell, ALLDATA or the manufacturer’s warranty schedule — and you are paid that time whether the work takes longer or shorter. Beat the book and you are paid for hours you did not spend. Fall behind and you are paid for fewer hours than you stood at the bench.
The formulas are short: Gross pay = flat rate × billed hours. Effective hourly rate = gross pay ÷ actual hours on the clock. Efficiency = billed hours ÷ actual hours. Efficiency above 100% means you are turning more book hours than clock hours.
Worked example: a good week
An auto technician is paid $35.00 a flat-rate hour. Over one week the tickets add up to 45 billed hours, and the tech is on the clock 40 hours.
- Gross pay: $35.00 × 45 = $1,575.00
- Effective hourly rate: $1,575.00 ÷ 40 = $39.38
- Efficiency: 45 ÷ 40 = 112.5%
- At that pace for 52 weeks: $81,900 before any time off
Worked example: a slow week
Same tech, a week of diagnostics and comebacks. The flat rate is $28.00, the shop turned only 32 billed hours, the tech was still on the clock 40 hours, and the shop guarantees $24.00 an hour.
- Gross flat rate pay: $28.00 × 32 = $896.00
- Effective hourly rate: $896.00 ÷ 40 = $22.40
- Efficiency: 32 ÷ 40 = 80%
- Guarantee: $24.00 × 40 = $960.00, so the shop owes a make-up of $64.00
National figures for the trade, from BLS OEWS May 2025: auto mechanics earn a median of $50,620 with the top of the range at $95,620 in Washington; auto body technicians earn a median of $54,890 with the top of the range at $133,140 in Washington; diesel mechanics earn a median of $61,770.
Where flat rate is used
- Dealership and independent auto service. The classic case, with warranty work often paid at a tighter book time than customer-pay work.
- Collision and auto body. Body and refinish time is billed off the estimate.
- Heavy truck, diesel, marine, motorcycle and equipment shops.
- Some HVAC, plumbing and appliance repair operations, usually as a per-task price rather than a book-hour schedule.
Common mistakes
- Judging an offer by the flat rate alone. A $40 rate in a shop that turns 30 hours a week pays less than a $32 rate in a shop that turns 45. Ask what the average technician actually bills.
- Forgetting unbilled time. Cleanup, waiting for parts, comebacks, training and shop meetings are clock hours that carry no book time. They are the main reason the effective rate lands below the flat rate.
- Assuming overtime does not apply. Flat-rate employees at retail service establishments can be exempt from overtime under section 7(i) of the FLSA, but only if more than half of pay is commission and the regular rate exceeds one and a half times the minimum wage. Otherwise overtime is owed, calculated on the regular rate derived from total pay divided by hours worked.
- Overlooking the minimum wage floor. Every clock hour must average at least minimum wage in the workweek, no matter how few hours were billed.
- Ignoring comeback policy. Redoing your own work is usually unpaid, so a shop with heavy comebacks quietly cuts your effective rate.
- Confusing efficiency with productivity. Efficiency compares billed hours to hours actually turning wrenches; productivity compares billed hours to all hours on the clock. Shops use both terms loosely, so confirm which one a pay plan means.
Frequently Asked Questions
Related job pages
Flat rate pay plans are standard across dealership service, collision and heavy equipment shops. These pages carry the current wage range for each trade.
Wage figures above are the national median for each job from the U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025.