Shop Supplies Fee: How Much to Charge and How to Explain It

A shop supplies fee covers the stuff you use on a job but cannot bill as a part: brake clean, rags, gloves, zip ties, thread locker. Most techs charge it as a small percentage of labor with a cap, and it only works when it is shown as its own line and explained before the job.

Work out your own number, free

Add up what you really spend on rags, cleaner and gloves each month and see the flat fee or percent that covers it.

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What it actually covers

Chemicals: brake clean, penetrant, carb clean, RTV, thread locker, anti-seize.

Consumables: gloves, rags, zip ties, electrical tape, small hardware, fluid absorbent.

Disposal: used oil, filters, coolant and the trip to drop it off.

Not covered: anything you can name and price as a part. If you bought a bolt for the car, it is a part line.

How mobile techs usually figure it

The common approach is a percentage of the labor on the ticket with a dollar cap, so a big job does not turn into a huge supplies charge. Some techs skip the percentage and price it per job type instead: one number for a brake job, another for a fluid service. Either way, add up what you really burned through last month and make sure the fee covers it. If it does not, the fee is a guess.

How to explain it in one sentence

"Shop supplies are the chemicals, gloves and disposal I go through on your job. It is listed on the estimate so you see it before you approve anything." That is it. The fee gets ugly only when it shows up for the first time on the final invoice.

Check your state

Some states with auto repair laws (Florida and California are two) regulate how charges must appear on estimates and invoices, and a vague "misc" line can be a problem. The safe habit everywhere: name the line "shop supplies", show it on the estimate the customer approves, and keep it reasonable.

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Common questions

Is a shop supplies fee legal?

In most places yes, as long as it is disclosed on the estimate before the work and shown on the invoice. States with repair acts may have specific rules on how it is listed, so check yours.

What percentage should a shop supplies fee be?

There is no rule. Add up what you actually spent on consumables last month, divide by your labor billed, and that is your honest percentage. Put a dollar cap on it.

Should I just build it into my labor rate instead?

You can. Some techs prefer one clean rate. The downside is your hourly looks higher than the guy who breaks it out, and a lot of customers compare hourly rates first.

Do I charge shop supplies on a diag only visit?

Usually not, unless you used chemicals or disposed of something. Charging it when you used nothing is how the fee gets a bad name.