Bookkeeping and taxes for trades and field service businesses

Running a trades or field service business means your financial picture is more complicated than most people realise when they first go out on their own. You are not selling a product from a shelf or billing monthly retainers. You are pricing jobs, tracking materials, paying subcontractors, putting miles on vehicles, and managing income that can swing significantly from month to month. The standard bookkeeping advice aimed at general small businesses fits your situation loosely at best.

This article covers the bookkeeping and tax obligations that actually matter for contractors, construction businesses, truckers, delivery operators, and field service providers. Not theory, not a checklist written for a generic small business, but the specific things you need to track and why they cost you money when they go wrong.

Why standard bookkeeping advice misses trades businesses

Most bookkeeping guidance is written for businesses that sell a service or product at a fixed price, receive payment relatively quickly, and have expenses that repeat in a predictable pattern. A contractor or tradesperson works differently on almost every dimension.

Your revenue is project-based or job-based, which means it comes in lumps rather than evenly. Some months you invoice $40,000 because three jobs hit completion at the same time. Other months you invoice $8,000 because you were doing prep work that has not been billed yet. If you are just tracking what goes in and out of your bank account, your financial picture looks erratic even when the business is actually healthy.

Your costs are job-specific in ways that matter for management decisions. Materials you buy for one job need to be tracked separately from materials you carry in stock. Labour paid to a subcontractor for a specific project is different from labour paid to an employee on your payroll. If your books lump all of these together, you cannot tell which jobs are profitable and which are costing you money, which means you are pricing future jobs without reliable information.

And your tax obligations are tied to a self-employment structure that most salaried employees never have to think about. No employer is withholding income tax or paying half your Social Security and Medicare contributions. All of that falls on you, four times a year, and the first time it arrives without warning it is usually expensive.

What you actually need to track

Job costs vs overhead costs

This is the distinction that matters most for trades businesses and the one most commonly ignored. Job costs are expenses directly tied to a specific project: materials purchased for that job, subcontractor labour hired for it, permit fees, equipment rentals used on it. Overhead costs are the expenses that keep the business running regardless of which jobs are active: insurance, vehicle payments, shop rent, tools, phone, and software.

Tracking these separately gives you the ability to calculate your actual gross margin per job. If you charged $15,000 for a bathroom renovation and your direct job costs were $9,000 in materials and subcontractor work, your gross margin on that job was $6,000, or 40%. That number tells you whether your pricing is working. Without it, you only know whether the whole business made money that month, which tells you very little about how to price the next job.

It is worth being clear about what this calculation is: a management-accounting tool for understanding job profitability. The tax treatment of individual purchases in that job-cost ledger is a separate question, and it depends on how your business accounts for materials, inventory, and cost of goods, which are covered below.

Good contractor bookkeeping sets up a chart of accounts that separates job costs from overhead and tracks materials, subcontractor payments, and direct labour against individual jobs or project codes.

Materials and supplies

Materials purchased for a specific job are direct job costs and belong in your job-level tracking. For tax purposes, however, the timing of the deduction depends on how your business accounts for materials. The IRS distinguishes between inventory, non-incidental materials and supplies, and incidental materials and supplies, and the deduction timing differs across these categories. Non-incidental materials and supplies are generally deducted when first used or consumed, not necessarily when purchased. If you carry meaningful inventory of commonly used materials, a different accounting treatment may apply entirely.

The practical implication is that linking receipts and invoices to specific jobs is excellent discipline for understanding profitability and for supporting any deduction claim. But you should not assume that the purchase date is automatically the deduction date. Your accountant or tax professional should confirm the correct treatment based on your accounting method and how you handle materials.

Vehicle expenses

For a contractor, plumber, electrician, HVAC technician, or delivery operator, the vehicle is a core business tool. The IRS gives you two methods for deducting vehicle costs.

The first is the standard mileage rate. For 2026, the rate is 72.5 cents per mile for business travel from January 1 through June 30, and 76 cents per mile for business travel from July 1 through December 31. You multiply your business miles for each period by the applicable rate and that is your deduction. The second method is actual vehicle expenses: fuel, insurance, registration, maintenance, repairs, and depreciation on the business-use percentage of total mileage. You calculate what share of your total miles were driven for business and apply that percentage to your actual costs.

The standard mileage method is simpler, particularly for lower-cost vehicles. The actual expense method can produce a larger deduction when you have a newer or more expensive vehicle with high operating costs. You cannot freely switch between methods from year to year, so the choice matters and is worth discussing with a tax professional in your first year of business use.

One important note for truckers and heavy equipment operators: the standard mileage rate applies to cars, vans, pickups, and panel trucks as defined by IRS Publication 463. Operators of tractor-trailers and heavy commercial vehicles may need separate guidance, because the rules can differ based on vehicle type and specific facts. Do not assume the same treatment applies across all vehicle categories.

Whichever method you use, you need a contemporaneous mileage log. The IRS expects records that capture the date of each business trip, the destination, the business purpose, the business miles driven, and the total annual mileage. Trying to reconstruct this from memory at year-end is difficult and produces records that are hard to defend under scrutiny. An app that logs trips automatically as they happen is far easier to maintain than a notebook you fill in occasionally.

Equipment and tools

Equipment and tools used in the business may be deductible, and a provision of the tax code called Section 179 may allow you to deduct the full cost of qualifying property in the year it is placed in service rather than recovering that cost gradually through depreciation.

For tax years beginning in 2026, the maximum Section 179 deduction is $2,560,000, with the deduction reduced dollar-for-dollar when the total Section 179 property placed in service during the year exceeds $4,090,000. The deduction is also limited to your business income for the year, and only qualifying property placed in service during the tax year is eligible.

In practical terms, this provision can allow a trades business to deduct the cost of a significant equipment purchase in the year of purchase rather than spreading a small deduction across five to seven years. Whether a specific piece of equipment qualifies, and whether the full cost can be deducted given your income for the year, depends on the facts of your situation. Present these numbers as a starting point for a conversation with your accountant, not as a guarantee that any given purchase will produce an equivalent reduction in your tax bill.

Subcontractors and the worker classification question

When you hire another tradesperson or driver to help on a job, the IRS cares whether that person is genuinely an independent contractor or whether the working arrangement looks like employment. Getting this wrong creates real exposure: back payroll taxes, penalties, and interest covering both the employer and employee share of FICA.

The IRS evaluates worker classification using what is called the common-law framework, which looks at three categories of evidence: behavioural control (does the business direct how the work is performed, not just the outcome?), financial control (does the worker invest in their own tools and equipment, serve other clients, and bear their own business risk?), and the type of relationship (is there a written contract, does the worker receive benefits, how permanent is the arrangement, and is this work a key aspect of your business?). No single factor is decisive. The IRS looks at the full picture of the relationship.

There is also a separate federal wage-and-hour dimension. In February 2026, the Department of Labor announced a proposed rulemaking that would apply an economic-reality test to worker classification under the Fair Labor Standards Act, focusing on two core factors, being control and opportunity for profit or loss, alongside other considerations. This proposed rule is not yet final. State classification rules may add yet another layer. The practical guidance is to review federal tax rules, federal wage-and-hour rules, and the rules of each state where you engage workers separately, rather than assuming the same test governs all three.

For workers you genuinely engage as independent contractors, collect a completed W-9 before the first payment. For 2026, the IRS increased the Form 1099-NEC information-reporting threshold from $600 to $2,000, which means you are required to file a 1099-NEC for a contractor only if you paid them $2,000 or more during the year. That threshold applies to the reporting requirement, not to the contractor's obligation to report their own income, and it has no bearing on how the worker should be classified. Continue tracking all payments regardless of amount and get the W-9 at onboarding, not at year-end when the reporting deadline is approaching.

Quarterly estimated taxes: The obligation that surprises people most

When you work for an employer, they withhold income tax and your share of FICA from every paycheck. When you run your own business, that mechanism is gone. The IRS still expects tax payments throughout the year, and for a calendar-year individual those payments come due on April 15, June 15, and September 15 of 2026, and January 15 of 2027.

Missing those payments, or significantly underpaying, results in an underpayment penalty on top of what you owe at year-end. The IRS safe harbour for 2026 generally protects you from that penalty if you pay the smaller of 90% of your 2026 tax liability or 100% of your 2025 tax liability across the four quarters. If your 2025 adjusted gross income exceeded $150,000 (or $75,000 if married filing separately), the prior-year safe harbour rises to 110% of your 2025 liability.

For trades businesses where income is seasonal or heavily project-dependent, dividing your annual tax estimate into four equal payments can leave you under-withholding in strong quarters. Form 1040-ES includes an annualised income instalment method that lets you calculate each quarter's required payment based on actual year-to-date income rather than an annual projection divided by four. This is worth using if your work is genuinely uneven across the year.

As a budgeting heuristic, setting aside 25% to 30% of job income in a designated account creates a reserve that covers both income tax and self-employment tax. The IRS self-employment tax rate is 15.3%, consisting of 12.4% for Social Security and 2.9% for Medicare, applied to approximately 92.35% of your net self-employment earnings. On $80,000 of net profit, the self-employment tax calculation works out to roughly $11,300 before income tax is added. Most people surprised by their first tax bill as a self-employed tradesperson did not know to set anything aside specifically for self-employment tax. The 25% to 30% reserve is a planning guide, not an IRS figure, and your actual obligation depends on your net earnings, other income sources, and applicable limits.

Deductions that trades businesses often miss

Beyond the main categories above, a well-run trades or field service business has deductions that often go unclaimed because the underlying records were not kept consistently enough to support them.

Your professional licences and certifications may be deductible, as may continuing education courses required to maintain them. Trade association memberships may be deductible. Work clothing required for the job and not suitable for everyday wear may be deductible, but the suitability test matters: items with a company logo are not automatically deductible simply because of the logo. The general standard requires that the clothing be specifically required for the work and not adaptable to everyday use.

If you use a dedicated space in your home exclusively and regularly for business purposes — quoting jobs, doing invoicing, managing scheduling — you may qualify for the home office deduction. The simplified method allows $5 per square foot up to 300 square feet, for a maximum of $1,500. The actual expense method allows a percentage of your home costs based on the office's share of total square footage. The exclusive-use requirement is strict: a desk in a room that also functions as a guest bedroom generally does not qualify.

Phone and internet costs that are genuinely used for business may be partially or fully deductible depending on your actual business use percentage. Interest on business loans and credit lines used for business purposes may be deductible. What is not deductible is personal debt that you occasionally use for business expenses.

Each of these deductions depends on your specific facts, your accounting method, and the relevant IRS rules for the year. The consistent record-keeping theme applies here too: the transactions need to be in your books throughout the year, linked to their purpose, and supported by documentation. Reconstructing this at year-end is harder and produces weaker records.

The cash flow reality of project-based work

One of the most common financial problems in trades businesses is not profitability but the timing gap between when costs go out and when invoices come in. You buy materials, pay subcontractors, and put hours into a job weeks before you receive final payment. If you are running several jobs at different stages of completion simultaneously, you can be profitable on paper while being short on cash.

Clean, current bookkeeping is what makes this gap visible and manageable. When your accounts receivable are clearly tracked, you can see which customers owe you money, how long their invoices have been outstanding, and what cash is actually coming in over the next 30 to 60 days. When that picture is murky, you cannot make reliable decisions about taking on new jobs, ordering materials on credit, or covering your next quarterly tax payment.

Setting payment terms on invoices and following up on overdue balances, rather than letting them slide because you are too busy on the next job, is the difference between having that cash in your account in 30 days versus 90.

How Inkle helps with the accounting layer

Inkle handles bookkeeping and tax filing for owner-operated businesses including contractors, construction companies, delivery operators, and field service businesses. Inkle Books gives you access to expert bookkeepers through the platform, and Inkle Tax is handled by certified CPAs who cover federal, state, and franchise tax filings.

Inkle handles the accounting and tax layer of your business. The specific features included — which states are covered, how job-level coding is handled, which 1099 workflows are supported, and what the monthly close process looks like — are worth confirming during onboarding based on your plan and entity type.

Inkle does not provide job costing software or field service management tools. Those are specialist functions with dedicated platforms built for them. What Inkle does is handle the bookkeeping, tax filings, and compliance calendar underneath your operations, so you are not managing that work yourself or searching for a CPA who understands the financial side of a trades business.

For truckers and delivery operators specifically, it is also worth noting that this article covers federal income-tax bookkeeping. A complete financial picture for a commercial operator may also involve state and local taxes, payroll, sales tax where applicable, permits, industry-specific record-keeping obligations, and potentially fuel-tax reporting. Those requirements depend on your specific operation and are worth reviewing separately with a qualified professional.

Inkle handles bookkeeping and tax for owner-operated businesses across the US. See how it works or book a demo to talk through what your business needs.

Note: This article covers general US federal tax information for bookkeeping and planning purposes. Tax treatment depends on your entity type, accounting method, business use, state law, worker facts, vehicle type, and the year an expense is placed in service. Confirm current IRS instructions and consult a qualified tax professional before relying on any deduction, filing a 1099, classifying a worker, or choosing a vehicle or equipment method.