Direct Answer
Employers treat workers' compensation insurance premiums as an ordinary and necessary business expense, so they deduct the cost on their tax return. For sole proprietors the deduction appears on Schedule C (Line 15), for partnerships and S‑corporations on Form 1120‑S (Line 12), and for C‑corporations on Form 1120 (Line 12). The expense is not reported as a payroll tax; it is listed under "insurance" or "other deductions."
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Why Workers' Compensation Is Deductible
Under Internal Revenue Code §162, any expense incurred in the ordinary course of business is deductible if it is both ordinary and necessary. Workers' compensation premiums protect the employer from liability for employee injuries, making the policy a legitimate business cost.
How Different Business Entities Report the Expense
Sole Proprietorship
Enter the total premium paid during the tax year on Schedule C, Part II, Line 15 "Insurance (other than health)." The amount reduces net profit, which flows to Form 1040.
Partnership or Multi‑Member LLC
Report the expense on Form 1065, Page 1, Line 12 "Other deductions." Attach a statement describing the deduction as "workers' compensation insurance." The amount is allocated to each partner's Schedule K‑1.
S‑Corporation
Enter the premium on Form 1120‑S, Page 1, Line 12 "Other deductions." Like partnerships, the expense is passed through to shareholders via Schedule K‑1.
C‑Corporation
List the cost on Form 1120, Page 1, Line 12 "Other deductions." The deduction reduces taxable income before corporate tax is calculated.
Documentation Requirements
Keep the following records in case of an audit:
- Invoices or statements from the workers' compensation insurer.
- Proof of payment (cancelled checks, bank statements, or credit‑card receipts).
- Proof that the policy covers employees in the reporting year.
Sample Reporting Table
| Business Type | Tax Form | Line for Workers' Comp |
|---|---|---|
| Sole Proprietor | Schedule C | Line 15 – Insurance (other) |
| Partnership / LLC | Form 1065 | Line 12 – Other deductions |
| S‑Corporation | Form 1120‑S | Line 12 – Other deductions |
| C‑Corporation | Form 1120 | Line 12 – Other deductions |
Common Mistakes to Avoid
- Classifying the premium as a payroll tax rather than an insurance expense.
- Failing to include the expense if the policy is paid in a different year than the coverage period (use the cash or accrual method accordingly).
- Omitting the required supporting documentation when filing electronically.
Bottom Line
Workers' compensation insurance premiums are fully deductible as a business expense on the appropriate line for the entity's tax return. Accurate reporting and proper record‑keeping ensure the deduction stands up to IRS scrutiny.