Brake cleaner, shop rags, thread locker, dielectric grease, zip ties, nitrile gloves, penetrating oil. None of it shows up as a part number, but every job burns through some of it, and over a month it adds up to real money. A shop supplies fee is how most repair shops recover that cost. Done well, it is a small, predictable line that customers barely notice. Done badly, it is the line they circle in red and ask about at the counter. This guide covers how to set the fee, the two common ways to calculate it, and how to disclose and explain it so it doesn't cost you goodwill.
What a Shop Supplies Fee Covers
The fee is meant to recover consumables that are used on the vehicle or during the repair but aren't practical to itemize. Typical examples include:
- Cleaners and solvents: brake cleaner, carb cleaner, degreaser.
- Chemicals in small amounts: thread locker, anti-seize, silicone, assembly lube.
- Fasteners and hardware from bulk bins: zip ties, clips, small bolts, heat-shrink.
- Protective items: seat covers, floor mats, fender covers, gloves.
- Absorbents and rags.
It should not be a catch-all for things that belong elsewhere. Disposal of used oil, coolant, tires and batteries is usually a separate environmental or disposal fee, and in some provinces and states those fees are regulated. Tools, equipment and rent belong in your labor rate. If you use a full quart of ATF or a can of refrigerant, bill it as a part. Keeping the fee narrow is what makes it defensible.
How to Figure Out What to Charge
Start with your own numbers instead of copying the shop down the road.
- Total your consumable spend for the last six to twelve months from your supplier invoices. Only count the items that truly fall under shop supplies.
- Total your labor sales for the same period, or count your repair orders.
- Divide to get either a percentage of labor or an average cost per repair order.
For example, suppose you spent $9,000 on consumables over a year and billed $300,000 in labor across 2,400 repair orders. That's 3% of labor, or $3.75 per repair order. That tells you the scale of what you are actually recovering. Most shops round up a little to cover price increases, but if your fee recovers several times what you spend, you are really raising your labor rate through a side door, and customers can tell.
Percentage of Labor With a Cap vs a Flat Fee
There are two common methods, and each has trade-offs.
Percentage of labor with a cap
This is the most widespread approach. The fee scales with the job, on the logic that a four-hour job uses more supplies than a 20-minute one. The cap stops it from getting silly on big jobs; nobody uses $90 worth of brake cleaner on a head gasket.
Flat fee per repair order
A flat amount, such as $5 or $10 per visit, is simple to explain and easy for customers to predict. The downside is that it overcharges a quick tire rotation and undercharges a timing belt job. Some shops use a flat fee with a minimum labor threshold, so a $25 wiper install doesn't get a supplies charge.
A worked comparison
Here is how a 5% of labor fee with a $40 cap compares to a flat $8 fee, using illustrative jobs at a $150/hr labor rate:
| Job | Labor | 5% with $40 cap | Flat $8 |
|---|---|---|---|
| Oil change (0.3 hr) | $45 | $2.25 | $8.00 |
| Front brakes (1.2 hr) | $180 | $9.00 | $8.00 |
| Water pump (3.0 hr) | $450 | $22.50 | $8.00 |
| Engine replacement (12 hr) | $1,800 | $40.00 (capped) | $8.00 |
Neither method is wrong. Percentage with a cap tracks actual usage better; a flat fee is easier to defend in one sentence. Many shops also exclude certain services, such as oil changes that already include supplies in a package price, or sublet work where your shop didn't touch the vehicle.
Disclose It Before the Work, Not After
The fee itself rarely causes the complaint. The surprise does. A customer who sees a supplies charge for the first time on the final invoice feels like something was slipped past them.
- Put it on the estimate as its own labeled line, calculated the same way it will be on the invoice.
- Post your policy at the counter and on your website or estimate footer: "A shop supplies charge of 5% of labor, up to $40, applies to most repairs."
- Label it plainly as "Shop supplies" rather than "Misc" or "Sundry." Vague labels invite questions.
- Keep it consistent. If one advisor waives it and another doesn't, customers will notice and ask why.
Some states and provinces have rules about how such fees are disclosed, whether they must appear on the estimate, or whether they can be a percentage at all. Check your local consumer protection or automotive repair rules, and ask your accountant how the fee should be taxed, because taxability of shop fees varies by jurisdiction.
If your estimates go out digitally, the supplies line shows up in the approval the customer taps, which removes most of the arguments. See how to create service estimates that get approved for more on presenting the total up front.
How to Explain the Fee at the Counter
Give your service advisors a short, honest script. Something like:
"That covers the cleaners, lubricants, small hardware and protective covers we use on every job that don't make sense to list one by one. It's based on the labor, and it's capped so it never gets out of hand on a big repair."
That's it. Don't apologize for it, don't call it a "government fee" if it isn't one, and don't make up a list of items that weren't used. If a customer pushes back on a small job, the advisor should have clear authority on whether they can waive it. Deciding that policy in advance is better than improvising.
When waiving makes sense
Some shops waive the fee on warranty comebacks, on quick checks with no real work, or for fleet accounts that negotiate it into their pricing. Those are reasonable business decisions. What hurts you is random waiving that teaches regular customers to ask every time.
Review the Fee Once a Year
Consumable prices move. Once a year, rerun the calculation from your supplier invoices and labor sales. If your recovery is way above cost, bring it down or fold the difference into a transparent labor rate increase. If it has fallen behind, adjust the percentage or the cap. Your sales reports make it easy to see how much the fee actually brought in against what you spent.
Setting It Up So It Runs Itself
The best shop supplies fee is one your advisors never have to calculate by hand. Set the percentage, cap, minimum and exclusions once, and let every estimate and invoice apply them the same way. In AutoSoftWay you can add shop supplies as a custom line on your estimates and invoices, while eco and environmental fees are applied automatically on their own lines, so supplies and disposal stay clearly separated. Pick a method you can explain in one sentence, show it before the work starts, and keep it tied to what you actually spend.