Boat Detailing Business: LLC vs. S-Corp Tax Structure

By Yarik Yarosh, CPA ·September 5, 2026 ·4 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Boat detailing is a mobile service business that isn’t classified as a specified service trade or business (SSTB) under IRC 199A. Detailing involves physical cleaning, polishing, waxing, and protecting boat surfaces, which is a hands-on trade, not professional advisory work. The full 20% QBI deduction applies at all income levels. The business is characterized by high margins (materials cost 5-15% of the service price), strong seasonality (60-70% of revenue in April through September), and relatively low equipment costs compared to other trades.

✓Key takeaway

Boat detailing entity structure:

SSTB classification: NOT an SSTB. Boat detailing is physical cleaning and surface treatment. Not consulting, health care, financial services, or any enumerated SSTB category.

Sole proprietor / single-member LLC:

All net profit on Schedule C
SE tax (15.3%) on all net profit
QBI deduction: 20% of qualified business income
No payroll needed
Best for detailers under $55,000 in net profit

S-Corp:

Owner salary via W-2 ($30,000-$45,000 for a solo detailer)
Remaining profit as K-1 distributions (no SE tax)
S-Corp break-even: $55,000-$65,000 in net profit
Payroll + return costs: $1,700-$3,500/year

Revenue model:

Wash and wax (25-30 ft boat): $300-$600
Full detail (compound, polish, wax): $800-$2,500
Bottom paint: $1,000-$3,000 (if offered)
Ceramic coating: $1,500-$5,000
Winterization detailing: $400-$800
Typical solo operator: 4-6 boats per week during peak season, 1-2 per week off-season
Annual revenue: $60,000-$200,000 depending on market and services

Margins:

Materials (soap, compound, wax, ceramic coating): 5-15% of service price
Marine ceramic coating: higher material cost (10-15%) but premium pricing covers it
Labor is the primary input (your time)
Gross margins: 65-80%

Seasonality impact on entity structure:

Revenue peaks April-September (boating season)
Off-season income: winterization, indoor storage facility detailing, auto detailing cross-over
The seasonal nature doesn’t change the S-Corp decision, but it does affect estimated tax payment planning
With S-Corp: W-2 salary is paid year-round (even in slow months), smoothing the tax withholding

When should a boat detailer elect S-Corp?

Hypothetical example

Round numbers. A mobile boat detailer in a coastal market, single filer. Revenue: $130,000 (peak season $100,000 + off-season $30,000). Expenses: $22,000 (vehicle, supplies, insurance, marketing). Net profit: $108,000.

Option A: Sole Proprietor

Net profit: $108,000
SE tax: $108,000 x 92.35% x 15.3% = $15,261
SE deduction: ($7,631)
QBI deduction: $108,000 x 20% = ($21,600)
Taxable: $108,000 - $7,631 - $21,600 - $15,000 = $63,769
Income tax: approximately $9,032
Total tax: $24,293

Option B: S-Corp ($45,000 salary)

FICA: $45,000 x 15.3% = $6,885
K-1: $63,000
QBI: $63,000 x 20% = ($12,600)
W-2 wage limit: 50% of $45,000 = $22,500 (exceeds $12,600, full QBI allowed)
Taxable: $108,000 - $12,600 - $15,000 = $80,400
Income tax: approximately $13,110
S-Corp costs: $2,200
Total: $22,195

S-Corp saves: $2,098/year at $108,000. Worthwhile, and the savings grow with income.

Equipment (Year 1 startup):

Item	Cost
Truck or van (used, over 6,000 lbs)	$30,000
Pressure washer (hot water)	$3,000
Buffer/polisher (Rupes, Flex)	$800
Wet/dry vacuum	$500
Water tank (for mobile)	$500
Generator	$1,500
Initial supply inventory	$2,000
Total	$38,300

With bonus depreciation on the truck and equipment, the $38,300 creates a Year 1 deduction that likely eliminates all tax in the startup year.

Seasonal cash flow:

Quarter	Revenue	% of Annual
Q1 (Jan-Mar)	$10,000	7.7%
Q2 (Apr-Jun)	$50,000	38.5%
Q3 (Jul-Sep)	$50,000	38.5%
Q4 (Oct-Dec)	$20,000	15.4%

With the S-Corp paying $45,000 salary year-round ($3,750/month), the withholding is ratable regardless of when revenue arrives. In Q1, when revenue is only $10,000, the $3,750 salary is funded from reserves built during peak season. This is a cash flow planning consideration, not a tax issue.

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Boat Detailing Business: LLC vs. S-Corp Tax Structure." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/boat-detailing-entity-structure-scorp

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.