Construction contractors are audited at a higher rate than most other industries. The IRS and California FTB know that construction businesses have significant cash transactions, complex subcontractor arrangements, and substantial equipment deductions — all of which create opportunities for both legitimate deductions and improper ones. The best defense is not luck — it’s bulletproof bookkeeping. Here are the top audit red flags for construction contractors and how to address each one.
Top IRS Audit Triggers for Contractors
1. Worker Misclassification
Using 1099 subcontractors for workers who should be W-2 employees is the #1 construction audit trigger. California’s EDD aggressively audits construction companies for misclassification. If reclassified, you owe back payroll taxes, penalties, interest, and potentially workers’ comp back-premiums. Defense: proper written subcontractor agreements, evidence that subs work for multiple clients, valid W-9s on file, no behavioral control over subs’ work methods.
2. Large Vehicle Deductions
Contractors who deduct expensive vehicles (especially SUVs and luxury trucks) at 100% business use attract scrutiny. Defense: contemporaneous mileage log showing dates, destinations, business purpose, and odometer readings for every business trip. Without a mileage log, the IRS can disallow your vehicle deduction entirely.
3. Cash Payments Without 1099s
Paying subcontractors in cash without issuing 1099-NECs is a massive red flag. All sub payments $600+ need a 1099-NEC, regardless of payment method. Defense: W-9 on file for every sub, proper 1099 filing, bank records showing payments match 1099 amounts.
4. Schedule C Losses Year After Year
A contractor who shows losses on Schedule C for 3+ consecutive years will be scrutinized for hobby loss rules. Defense: a profitable business with genuine documentation of all deductions and a business plan showing path to profitability.
5. Home Office Deduction Without Proper Setup
Home office deductions are legitimate but require exclusive, regular use of a dedicated space for business. A kitchen table or bedroom corner doesn’t qualify. Defense: photos of the dedicated office space, floor plan measurements showing the percentage of home used for business, and records of administrative work performed there.
Bookkeeping Is Your Audit Defense — Call (818) 679-4451
The best audit defense is records so organized and comprehensive that any auditor would be satisfied within 30 minutes. Bookkeeping Champs maintains audit-ready records for contractors throughout LA. If you’re ever audited and your books are handled by us — you’ll have nothing to worry about. Call (818) 679-4451.
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