I’ve seen automotive repair shop charts of accounts with 50 accounts. I’ve seen them with 500. And here’s the problem: More detail does not automatically mean better financials.
In fact, when we’re setting up the accounting for a shop, too much detail too early can make the financials worse. Every additional account creates another decision someone has to make.
Is this Software? Office Expense? Technology? Subscriptions? Dues & Subscriptions? Shop Management Software?
Give three different people that transaction and you might get three different answers. Do that hundreds of times every month and eventually you end up with inconsistent financials. Or worse, the financials don’t get done.
That’s why I believe an automotive repair shop’s chart of accounts should start simple.
A good auto repair shop chart of accounts should make it easy to see where the shop makes money, what it costs to produce the work, and what it costs to run the business. At minimum, it should clearly separate parts sales, parts cost, labor sales, and technician labor cost, with additional detail added only when it helps the owner make a better decision.
First, build a system that allows you to consistently produce accurate, timely financial statements.
Then earn the complexity.
Start With Financials You Can Actually Produce
The best chart of accounts isn’t the one with the most detail. It’s the one your accounting process can actually support every single month.
I’d rather have a shop consistently receiving accurate financial statements by the 15th with 40 useful accounts than getting a beautifully detailed 300-account P&L three months late.
Financial information has a shelf life. If you’re looking at April’s numbers in July, they aren’t nearly as useful for running the shop.
So when we’re starting from scratch or cleaning up an existing accounting system, our first goal is to make the monthly accounting process as repeatable as possible. We want transactions categorized consistently, the books closed on time, and financial statements delivered while the information is still useful.
Once that process is working, we can start asking: What additional detail would actually help us make better decisions?
That’s when complexity becomes valuable.
What Should an Auto Repair Shop Chart of Accounts Include?
At the most basic level, there are four numbers I want to identify immediately:
- Parts sales
- Parts cost
- Labor sales
- Labor cost
Those four numbers give us two of the most important operational measurements in the business: parts gross profit and labor gross profit.
When we say labor cost, we’re generally talking about the unloaded wages of the technicians producing the work. Understanding your [true labor costs] is also important when you’re determining what that labor ultimately needs to sell for.
We don’t want every payroll-related expense dumped into direct labor. We want to know: What did we pay our technicians to produce the labor we sold?
If your chart of accounts doesn’t let you calculate parts and labor gross profit quickly, I’d fix that before worrying about almost anything else. Those are major inputs into the economic engine of the shop.
How Does the 40-40-20 Framework Fit In?
From there, we can zoom out.
A simple framework we use for thinking about automotive repair shop financials is 40-40-20:
- 40% — Cost of Goods Sold
- 40% — Overhead
- 20% — Net Income
That doesn’t mean every successful shop will land at exactly 40.00%, 40.00%, and 20.00%. It’s a framework.
For every $100 coming into the business, we’re essentially asking: Can we produce the work for around $40? Can we operate the rest of the business for around $40? Can we leave around $20 at the bottom?
Parts and labor gross profit help us understand the first 40%. Our overhead structure helps us understand the second 40%. And what’s left determines the 20%.
Manage Overhead as a Number
This is another place where shops can get distracted by too much detail.
From an operational standpoint, total overhead is often more important than obsessing over every individual overhead account.
Let’s say your overhead is $70,000 per month. Now we can work backward.
How much gross profit does the shop need to generate? How much revenue does that require? How many repair orders? At what average repair order? How many billed hours? At what effective labor rate? How much technician capacity do we need? How many phone calls do we need to answer and how many appointments do we need to make?
Now your accounting is influencing what happens inside the shop. These are the kinds of [shop KPIs worth tracking consistently] because they connect what you see in the financial statements to what’s actually happening in the business.
That’s what I want.
I don’t want to spend the first 20 minutes of a financial review debating whether a $500 expense should have been coded to Office Expense or Software. I want to know whether our cost structure works and what operational metrics we need to hit next month to support it.
Which Expenses Should an Auto Repair Shop Track Separately?
Once the shop has an established process and rhythm for producing financial statements, we can start expanding the chart of accounts.
But there’s an important rule:
Don’t add detail just because you can. Add detail because you’re going to do something with it.
There are several expenses we generally believe are worth separating.
Service Advisor and Service Manager Wages
Technicians produce the work. Advisors and managers help sell, manage, and facilitate it.
Those are different economic functions, so we generally want advisor and service manager wages visible separately from technician wages. That helps answer questions about staffing levels, front-counter capacity, management structure, and the revenue required to support those positions.
Other Wages
Administrative staff, drivers, bookkeepers, and other non-production employees can generally be grouped separately as other wages.
Again, we aren’t trying to create an individual P&L account for every employee. We’re trying to create enough separation to make decisions.
Marketing
Marketing deserves visibility because we expect something from it.
If the shop spends $8,000 a month on marketing, I want to know that. Then we can ask what happened to new customers, car count, acquisition cost, revenue, and ultimately return on that investment.
Occupancy
The cost of operating the facility is another important number.
A shop with $8,000 of monthly occupancy costs has a fundamentally different cost structure than a shop spending $20,000. That affects the revenue and gross profit the business needs to produce.
Owner Discretionary Expenses
We also like owner discretionary expenses identified separately.
There may be completely legitimate expenses running through the business that another owner wouldn’t necessarily incur. Separating those expenses helps us distinguish between what it costs to operate the shop and what the current owner chooses to spend through the business.
That’s particularly important when we’re trying to normalize earnings or [understand what an auto repair shop is worth].
Use Subaccounts Without Cluttering Your P&L
Here’s another way to avoid turning your P&L into a monster: Use subaccounts.
Let’s say marketing becomes an area you want to watch closely. Instead of creating five completely separate top-level expense categories, you might have:
Marketing
- Google Ads
- Social Media
- Events & Sponsorships
- SEO & Website
- Other Marketing
Now we get the best of both worlds. When we’re doing a high-level financial review, we can collapse everything and see Marketing — $8,400. When we’re specifically reviewing marketing, we can expand the category and see exactly where the $8,400 went.
The same concept can work for occupancy, software, payroll, or other expenses where additional detail becomes useful.
Your detailed chart of accounts should be collapsible back into a simple P&L.
That’s an important test. If I can’t collapse the financial statements into something an owner can quickly understand, we’ve probably created too much noise.
Which Operational Accounts Are Worth Tracking?
There are also a few accounts we like because they highlight specific operational behavior.
Warranty, Comeback, and Goodwill
Every shop eats some costs. Maybe you warranty a repair. Maybe a vehicle comes back. Maybe you take care of something for a customer because it’s the right thing to do.
We like an internal Warranty / Comeback / Goodwill account so we can quantify what the shop is absorbing. A few hundred dollars probably isn’t worth losing sleep over. Several thousand dollars every month might tell us we have an operational problem.
Discounts
We also like discounts separated because discounting is an operational decision.
If we’re discounting $10,000 every month, that’s something I want to see. Then we can investigate advisor behavior, promotions, pricing strategy, customer expectations, or whatever else is driving it.
Sublet Sales and Costs
If sublet work is material, we generally want sublet sales separated.
If we have reliable information for the corresponding cost, we’d like sublet cost separated as well. That lets us evaluate the economics of that revenue rather than mixing it into parts or another category.
Shop Supplies
The same concept applies to shop supplies.
If you’re charging customers for shop supplies, we want shop supply revenue identified. If the corresponding costs can be tracked reliably, we can separate those as well.
Notice the word I keep coming back to:
Reliably.
If adding another layer of detail makes your accounting less accurate, less consistent, or dramatically slower, I’m not sure we’ve improved anything.
Not Every Question Needs Its Own Account
Not every question needs to be answered by the face of the P&L.
One of the biggest mistakes I see when people design charts of accounts is trying to build an account for every question they could possibly want to ask someday. You don’t need to.
If I want to know exactly what we’re spending with a particular software vendor, uniform company, waste provider, or office supplier, we can run an expense review. We can drill into the general ledger, review transactions by vendor, and analyze the underlying detail.
The chart of accounts should answer the questions we need to ask every month.
The general ledger can answer the questions we need to ask occasionally. Those are two different things.
Earn the Right to Add Complexity
This is probably the biggest takeaway.
Don’t start by building the perfect 300-account chart of accounts. Start by getting four things right:
Accurate. Consistent. Timely. Useful.
Get the financials done every month and establish the rhythm. Make sure parts sales, parts cost, labor sales, and technician labor cost are right. Understand gross profit. Understand overhead. Understand net income.
Then, once that foundation works consistently, start adding detail around the expenses that deserve additional attention. And when you do add detail, use subaccounts whenever possible so you can collapse everything back into a financial statement that is easy to understand.
Your goal isn’t to win an award for the most sophisticated chart of accounts.
Your goal is to get reliable financial information into the hands of the person running the shop while there’s still time to do something with it.
Start simple.
Get consistent.
Then add complexity only where complexity creates a better decision.
Eric Joern
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