Almost everything you spend to run a pool service business is deductible. The more important question is how each expense gets categorized, because that affects both your tax bill and how accurately your books reflect route profitability.

Chemicals are your largest recurring cost and they belong in cost of goods sold, not operating expenses. Chlorine, muriatic acid, algaecides, stabilizers, shock, and salt for chlorine generators all reduce gross revenue before you calculate profit. Tracking chemical costs by route or customer matters because it shows which accounts are actually profitable. A pool that eats chemicals because of sun exposure, heavy use, or poor circulation can quietly cost you money while looking fine on a flat monthly invoice.

Equipment is a big deduction but the timing depends on the cost. Test kits, poles, brushes, leaf rakes, hoses, and small pumps get expensed in the year you buy them. Larger purchases like a commercial-grade vacuum, trailer, or replacement equipment you stock for customer repairs typically get capitalized. Section 179 lets you deduct the full cost of qualifying equipment in the purchase year instead of depreciating it over several years. Your service trucks qualify too, and for a growing pool service this is usually where the biggest tax savings sit.

Vehicle expenses are deductible using either actual costs (fuel, maintenance, insurance, depreciation) or the standard mileage rate. Trucks used primarily for routes usually come out ahead with actual expenses because of fuel and maintenance volume. Whichever method you choose, keep mileage logs. The California franchise tax board and the IRS both want documentation.

Insurance premiums for general liability, commercial auto, workers’ comp, and any pollution liability coverage you carry are fully deductible. So are your California contractor license fees if you carry a C-53 swimming pool license, pesticide applicator certifications, continuing education, and local business licenses across the cities where you operate.

Uniforms with company branding, work boots, safety gear, and sun protection required for outdoor work are deductible. Phone bills, route management software, scheduling apps, and invoicing tools count as operating expenses. Marketing costs including your website, truck wraps, door hangers, Google ads, and referral rewards are fully deductible.

Professional services are deductible, including what you pay a CPA, attorney, or Pasadena bookkeeper. Payment processor fees on credit card transactions reduce your taxable income too, which matters because those fees add up quickly on recurring monthly billing.

What trips pool operators up is not missing categories of deductions but failing to document them or categorizing chemicals as general supplies instead of COGS. That kind of miscoding makes your gross margin look wrong and hides which routes are actually making money. Bookkeeping built for pool service businesses treats chemicals as route-level COGS, tracks equipment purchases for Section 179 planning, and keeps vehicle documentation clean so nothing gets left on the table at tax time.