Whether you're turning wrenches or turning over vehicle inventory, we handle the accounting questions specific to the automotive business — shop equipment, floor plan financing, and sales tax on parts and labor — so you can focus on the bay.
Auto repair shops, body shops, and dealerships sit on a spectrum most CPAs don't navigate well across its full range. A repair shop's accounting looks like most service businesses — labor, parts, equipment. A dealership's accounting looks completely different, with vehicle inventory financed through floor plan loans that carry their own interest deduction rules. Many businesses in this industry actually do both, and the books need to reflect that correctly.
At Mercer Flanagan, we've worked with auto repair shops, body shops, and dealerships in Frederick and surrounding counties for over 50 years. We know how vehicle inventory and floor plan financing should be accounted for. We know the sales tax rules on parts versus labor. And we're here year-round — not just in April.
"The dealerships and shops that come to us usually have the same gap: their books treat every vehicle or every repair the same way, when the actual financing, inventory, and tax treatment underneath can be very different. Getting that structure right is what makes the rest of the accounting actually accurate."
We work with:
These are the situations we hear about most often from new clients in this industry — separated by whether you run a repair shop or sell vehicles.
Floor plan financing interest has its own tax treatment, and dealerships using this financing can be affected differently by business interest expense limitation rules than a standard business. Many dealerships haven't had this specifically reviewed.
Maryland often treats parts and labor differently for sales tax purposes. Inconsistent invoicing creates either under-collection risk or confused customer billing, and many shops have never had their invoice structure confirmed.
Each vehicle in inventory is unique, often individually financed, and carries its own holding costs. Generic inventory accounting doesn't capture this, making it hard to know true margin on a specific sale.
Lifts, diagnostic equipment, and specialty tools are expensive — Section 179 and bonus depreciation rules let you deduct much of that cost in the year of purchase. Many shops aren't applying this as aggressively as they could.
Many established owners are still operating as a sole proprietor well past the point where an S-Corp election would meaningfully reduce self-employment tax. We evaluate this for every new client.
Flat-rate or commission-based technician pay structures create wage and hour compliance questions that need a clear, consistent policy, not an ad hoc decision for each technician.
How your business is structured has a bigger impact on your tax bill than almost any other single decision. Here's how the common options compare for auto repair shops and dealerships.
| Structure | Self-Employment Tax | Admin Complexity | Best For |
|---|---|---|---|
| Sole Proprietor / Single-Member LLC | 15.3% on all net income | Lowest | New or very small repair operations |
| S-Corporation | Only on reasonable salary | Moderate | Established shops earning $80K+ net |
| Partnership / Multi-Member LLC | Can be high | High | Shops or dealerships with multiple owners |
The right answer depends on your income level, whether you carry vehicle inventory, and whether you have business partners. We analyze this for every new client. Read our S-Corp vs. LLC guide →
We set up inventory tracking that ties each vehicle's cost, floor plan financing charges, and eventual sale together accurately, and review how your floor plan interest should be treated under current business interest expense rules.
We help confirm how your specific invoices should separate and tax parts, labor, and vehicle sales under Maryland sales tax rules, so your billing structure holds up if reviewed.
Lifts, diagnostic equipment, and specialty tools generally qualify for Section 179 expensing and bonus depreciation, allowing you to deduct much of the cost in the year of purchase rather than depreciating it over years.
We evaluate your current structure, run the numbers on what an S-Corp election would save you, and handle the paperwork to make the switch if it makes sense. For many owners earning over $80,000 in net income, this is the highest-return tax move available.
S-Corp vs. LLC: Which Is Right for You? →We prepare your business return — Schedule C, Form 1120-S for S-Corps, or Form 1065 for partnerships — along with your personal Form 1040, including all schedule attachments.
Small Business Tax Services →We calculate your quarterly estimated payments based on your actual income and adjust as the year unfolds. No surprise April bills.
Tax Planning Services →If you need compiled financial statements for floor plan financing, a bank loan, or a business expansion, we handle that. Clean, professionally prepared statements that lenders and financing companies accept.
Financial Statement Compilations →These are the deductions that auto repair shops, body shops, and dealerships most often underutilize or miss entirely. Every situation is different, and eligibility depends on your specific circumstances, but these are worth discussing with us.
Deductibility always depends on your specific facts and circumstances. The IRS has specific rules about what qualifies, how to document it, and how to calculate it. We make sure you're capturing what you're entitled to — and that it's documented properly so it holds up if questioned.
Big firms want big corporate clients. We built our practice around the shop owners and dealers who are the backbone of Frederick County's automotive industry. You won't be handed off to a junior associate. You won't wait three weeks for a call back. You get a CPA who knows your name and your situation.
Year Mercer Flanagan was founded in Frederick, MD
Years serving local professionals, businesses & nonprofits
Rated by clients across Frederick County
Access to your CPA — not just during tax season
Year-round access to your CPA. Questions get answered when you have them, not weeks later.
We understand vehicle inventory financing and how it should flow through your books.
We're based in Frederick, MD. We know this community and we're not going anywhere.
We don't just file your returns. We contact you when something changes that affects your tax situation.
Book a free 20-minute consultation. We'll tell you honestly whether we can help — and what it would cost. No pressure, no obligation.
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