2026 tax year

Plumber taxes and deductions

Emergency call-outs make mileage the biggest single deduction in this trade, and the least well recorded. A drive at 2am is worth exactly the same per mile as one at 2pm, and neither counts if it is not written down.

Drain cameras, jetters and press tools are Section 179 property, the whole cost comes off in the year the tool goes into service rather than being spread across its life. Parts bought for a job are deductible when used; a van full of stock at December 31 is inventory, not an expense. Water damage callouts put you in the insurance chain, and money an insurer pays you directly is your income while money it pays the homeowner is not, the difference decides whether it belongs on your return at all. Backflow certification and medical gas endorsements are separate qualifications with separate renewal fees, and each renewal is deductible.

The deductions with a rule attached

These are the lines where the answer is not simply "keep the receipt"each has a cap, a percentage or a test that decides how much of the spend you actually get:

Tools: Section 179 property. Deduct the whole cost in the year it goes into service rather than spreading it over the asset's life, up to $2,560,000 a year, and 100% bonus depreciation is now permanent. The catch is the business-use test: anything used more than 50% for the business qualifies, and you deduct at that percentage rather than the full price. So anything you also use at home comes off at the share that is genuinely work, not the whole invoice.
Vehicle: Business driving counts; commuting does not. The rate changed mid-year: 72.5 cents a mile to June 30, 2026 and 76 cents from July 1, so a full year has to be split at that date rather than multiplied by one figure. A hundred business miles a week across the whole year is about $3,861 off your profit. You cannot use the standard rate at all on a vehicle you have already claimed MACRS depreciation, Section 179 or bonus depreciation on.
Continuing education: Hours required to keep a license you already hold are the clearest case there is. Spending on continuing education to stay current is deductible; the training that qualified you to start is not. The test is about where you are, not what the course teaches, which is why the identical enrollment fee can be deductible for you and not for the person sitting beside you.
Equipment: Section 179 property. Deduct the whole cost in the year it goes into service rather than spreading it over the asset's life, up to $2,560,000 a year, and 100% bonus depreciation is now permanent. The catch is the business-use test: anything used more than 50% for the business qualifies, and you deduct at that percentage rather than the full price. So anything you also use at home comes off at the share that is genuinely work, not the whole invoice.
Phone: You get the business-use percentage of the bill, not the bill. Business-use percentage of total cost. A line you also use personally is a split, and the split needs to be defensible rather than round.

The rest of the plumber deduction list

Ordinary and necessary business expenses, deductible in full in the year you pay them, provided they are genuinely for the business:

Licensing fees state
Liability insurance
Materials and supplies
Safety equipment

Worth knowing

Emergency call-outs make mileage the largest single deduction for most plumbers, and it is the one least often logged properly. Specialist equipment, drain cameras, jetters, press tools, is Section 179 property and can be written off in full the year it goes into service.

That is what is specific to this trade. The larger deductions are the universal ones, see the full checklist.

What each deduction is worth to you

On $100,000 of profit with no state income tax, $1,000 deducted saves $305, 30.5%, because it comes off self-employment tax and income tax together:

Net profit	Saved per $1,000 deducted	Effective
$40,000	$231	23.1%
$100,000	$305	30.5%
$200,000	$297	29.7%

The last row is worth less than the one above it, and that is not a mistake: past the Social Security wage base the self-employment part of the saving drops from 15.3% to 2.9%, and the higher income-tax bracket does not quite make up the difference. A deduction is worth most in the middle.

Add a state income tax and every row rises. The 1099 calculator applies that layer.

What these words mean

Section 179: A rule letting you deduct the whole cost of equipment in the year you start using it, instead of spreading it over the years you own it.
Depreciation: Spreading the cost of something long-lasting, a vehicle, a camera, a tractor, across the years you use it, rather than deducting it all at once.
MACRS: The standard federal timetable for depreciation, the schedule that decides how much of an asset’s cost you deduct in each year of its life.

General information about how these deductions work, not tax advice. Whether a particular expense is deductible for you depends on facts this page does not have, check with a tax professional before claiming anything listed here.