Accounting for Plumbers
Plumbing businesses carry the same core tax questions as other trades: how to structure the entity, how to track jobs so bids are accurate, and how to handle vehicles, tools, and subcontractors correctly. Blue Sage handles the bookkeeping, the returns, and the sales tax treatment that varies between repairs and capital improvements.
What we handle
- Job costing across labour, materials, and permits
- Vehicle and equipment deduction tracking
- Subcontractor classification and 1099 issuance
- Entity structure and S-corporation election modeling
- Sales tax on repairs versus capital improvements
- Emergency and service call revenue tracking
Who this is for
Independent plumbers, plumbing and heating contractors, and service businesses running scheduled and emergency work.
Businesses that mix scheduled installation work with emergency service calls often have very different margins on each without knowing it. Splitting the two in the books is usually the first thing worth doing.
Deadlines and rules worth knowing
| Item | What applies |
|---|---|
| Job costing | Labour, materials, and permits per job, with service calls tracked separately from installations |
| Repairs vs improvements | New York and many states tax these differently for sales tax purposes. The distinction affects what you charge. |
| Vehicles | Actual expenses or standard mileage. Decide deliberately when the vehicle is placed in service. |
| Subcontractors | W-9 before payment, 1099 after year end above the threshold |
| Entity | S-corporation election generally worth modeling once profit is consistent |
| Equipment | Larger purchases are subject to depreciation elections that affect which year the deduction lands in |
How we work
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Review what exists
We read last year’s return and whatever records you have. Most of what needs fixing is visible quickly.
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Fixed quote in writing
Scope and price before anything starts, counting entities, states, and any cleanup needed.
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File and maintain
Returns prepared and filed, notices answered, and a projection before year end.
Questions
Do I charge sales tax on plumbing work?
It depends on whether the work is a repair or a capital improvement. In New York and many other states, repair and maintenance services are taxable while capital improvements are not, though the contractor generally pays tax on materials in the latter case. Getting the classification right protects you if it is examined.
How do I know which jobs are actually profitable?
By costing them individually u2014 allocating labour hours, materials, and permits to each job rather than looking only at the year as a whole. Service calls and installations often have very different margins, and a business can be profitable overall while consistently losing money on one category.
Last reviewed 11 September 2026 by Fahadun Nabi, Founder, Blue Sage Tax and Accounting Inc.. General information, not advice for your specific situation.
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Talk it through before the deadline, not after.
A free consultation call, no obligation, and a fixed quote if you want to go further.