Construction Tax Deductions: A Year-End Checklist for Subcontractors
At the 24% federal bracket, $40,000 in deductions that never make it onto the books costs a subcontractor about $9,600 in income tax, and on a $5 million contract business that’s an easy number to lose between bond premiums, bid costs, and per diem nobody coded correctly. From producing weekly certified payroll and keeping the books for construction subcontractors, we’ve found the missed money in this industry usually sits in costs that are specific to contract work, the kind a general bookkeeper doesn’t recognize and lumps into miscellaneous expense or misses entirely.
Florida has no state personal income tax, so for most pass-through subcontractors the federal return is where every missed deduction lands. This checklist covers the deductions that matter most for subs on bonded, public, and prevailing wage work. Whether your return is filed on a cash, accrual, or contract-specific method is your tax CPA’s call, and it affects timing on a few items flagged below, so treat this as educational and confirm specifics with your tax pro before you file.
What a missed deduction actually costs
Picture a $5 million electrical subcontractor running a mix of public and private work. Over the year the owner paid $14,000 in bid bond and plan room costs on jobs the company didn’t win, $11,000 in per diem and lodging for a crew on an out-of-town school project, $9,000 in small tools, PPE, and supply house runs the owner put on a personal card, and $6,000 in OSHA training and license renewals paid out of pocket. That’s $40,000 in legitimate business costs that only reduce the tax bill if they’re recorded, which at the 24% bracket is about $9,600 left on the table. None of it required a clever tax strategy, only a set of books built for contract work.
Bonds, bid costs, and job-specific fees
Performance and payment bond premiums on a specific job are deductible, and on a well-structured set of books they sit in job cost so they show up in that job’s margin. Bid bonds, plan room subscriptions, takeoff services, and estimating costs on jobs you didn’t win are deductible too, and they’re the most commonly missed item for subs who bid public work heavily, because they never attach to a job that exists in the books. Job permits, inspection fees, and testing costs round out the category.
Your construction chart of accounts should give each of these an obvious home so they land correctly the first time instead of getting sorted out in December.
Field labor, payroll taxes, and workers’ comp
Field wages, employer payroll taxes, workers’ compensation premiums, health insurance, and retirement contributions are all deductible. Florida workers’ comp for construction trades runs among the highest rates in the country, which pushes burdened labor 30 to 50 percent above base wages, so it’s one of the largest lines on the return. Workers’ comp audits are worth watching at year-end too, since an audit that reclassifies employees into higher-rated class codes can produce an additional premium bill that belongs in the year it relates to.
Make sure your payroll provider’s year-end reports tie to the P&L before anything gets filed. When they don’t, the gap is usually a posting error rather than missing money, and it’s far easier to find in December than in April.
Prevailing wage fringe benefits
On certified payroll jobs, how you satisfy the fringe requirement changes the tax treatment. Fringe paid to employees in cash is treated as wages, which makes it deductible but also subject to payroll taxes. Fringe paid as contributions to a bona fide benefit plan, like a health plan or retirement plan, is deductible as a benefit expense and generally isn’t subject to payroll taxes, which is why many subs on steady prevailing wage work move to plan contributions over time.
Either way, accrued fringe owed at year-end on covered hours should be on the books as a liability so the expense lands in the right year. Our post on prevailing wage fringe benefits walks through how the credits work and how to track them alongside certified payroll.
Per diem, travel, and out-of-town jobs
Lodging, per diem, and travel for crews working away from home are deductible when they’re documented and tied to the job. Public work often means school, municipal, and state projects outside your home market, so this category can get large quickly. Per diem paid under an accountable plan generally isn’t taxable to the employee, while flat payments with no substantiation can turn into wages, so the way you pay it matters as much as the amount. Code these costs to the job they belong to so they show up in job margin.
Equipment, vehicles, and fuel
Larger equipment like lifts, trenchers, and trailers, along with trucks, are capital assets, and your tax pro decides whether to write them off in the year of purchase or spread the deduction over several years. Keep the invoice and purchase date for each one, because a December equipment purchase can meaningfully change the tax bill. Small tools, consumables, and PPE below your capitalization threshold are generally deducted when you pay for them.
Fuel and vehicle repairs are deductible as well, and on a contractor’s books they belong in job cost as a pooled indirect cost rather than in overhead. Keep one fuel account instead of one per truck, since the detail you’d actually use already lives in the card statements.
Subcontractors, retainage, and 1099s
Payments to lower-tier subs are deductible. Collect a W-9 before the first payment, because chasing one in January rarely goes well. Under 2025 legislation the 1099-NEC reporting threshold rose from $600 to $2,000 for payments made in 2026 and later, so confirm with your tax pro which threshold applies to the year you’re filing.
Retainage is where the timing questions show up. Retainage held on your own billings and retainage you’re holding on your subs both affect when income and expense are recognized, and the answer depends on your tax method. You don’t need to solve that yourself, but your tax preparer does need a clean list of retainage receivable and payable by job at December 31. Our post on retainage accounting in QuickBooks covers how to keep that list current.
Insurance, licensing, and compliance
General liability, commercial auto, inland marine coverage on tools and equipment, umbrella policies, and builder’s risk or project-specific coverage are deductible. So are your state contractor license through Florida DBPR, local business tax receipts, certifications, and the continuing education and OSHA training needed to keep crews compliant on public jobs. Certified payroll software and compliance platforms some GCs require belong here too.
Backcharges, warranty work, and bad debt
Backcharges you accept from a GC reduce revenue, and warranty and callback work after closeout is a deductible cost that’s worth tracking by job so you can see which crews or scopes keep generating it. Bad debt from a GC who never pays is only deductible if the income was already reported, which generally means accrual-basis filers, so a cash-basis sub simply never reports the unpaid invoice as income in the first place. Ask your tax pro which applies before writing anything off.
Costs that don’t count
Fines and penalties, including late certified payroll penalties and code violation fines, aren’t deductible. Personal use of company trucks, family phones on the business plan, and personal charges on the business card need to be backed out or classified as owner draws. Keep these in clearly labeled accounts rather than burying them, so your tax preparer can find and exclude them quickly.
The year-end checklist
Before you hand the books to your tax preparer, work through these items.
Sweep personal cards and accounts for business purchases and record them
Reconcile every bank, credit card, and loan account through December 31
Pull bid bond, plan room, and estimating costs on lost bids into the books
List bond premiums by job and confirm they’re coded to job cost
Tie payroll provider year-end reports to the P&L
Record accrued fringe owed on covered hours at year-end
Gather per diem and lodging documentation for out-of-town jobs
List every equipment and vehicle purchase with date, cost, and invoice
Build a retainage receivable and payable list by job as of December 31
Collect missing W-9s and confirm 1099 filing requirements
Move fines, personal charges, and owner draws out of expense accounts
A subcontractor that runs through this list every December files a cleaner return, hands its surety cleaner financials, and almost always pays less tax. If the list turns up more cleanup than you expected, that’s a sign the books aren’t built for contract work, and it’s worth fixing before the next bonding review rather than after.
At Prophet Accounting, we work with construction subcontractors on bonded, public, and prevailing wage work nationwide. We keep your books structured around jobs and contracts all year, with certified payroll, retainage tracking, and job costing handled, so every deduction you’ve earned is where your tax pro can find it and year-end becomes a handoff instead of a scramble.
Schedule a consultation at prophetaccounting.com/construction or give us a call at (772) 380-2871.
