Allocation
Multiply your annual homeowners or renters insurance premium by your home-office business-use percentage. The result is deductible on Form 8829 as an indirect expense (or absorbed into the simplified-method $5/sq ft if you elect that route).
Riders for business equipment
A rider added to homeowners insurance specifically for business equipment, business inventory, or business liability is 100% deductible — not subject to the home-office allocation. Treat it like business insurance.
Separate business policy
Many home-based businesses purchase a separate "in-home business" or "home-based business" policy. The separate policy is 100% deductible and provides better coverage than relying on a homeowners endorsement, which often excludes business liability.
Title insurance and mortgage insurance
Mortgage insurance premiums (PMI) on a home-based business mortgage are partly deductible as an indirect home-office expense, prorated by business-use percentage. Title insurance is a one-time cost capitalized into the basis of the home and depreciated with the rest of the basis.
Where it goes
Form 8829 line 18 ("Insurance"). Or absorbed into the simplified-method $5/sq ft.
Documentation that survives an exam
An IRS examination of this deduction will request three things: proof of payment (bank or card statement), proof of the underlying transaction (invoice or receipt), and proof of business purpose (a contemporaneous note or calendar entry). The first two are usually trivial to produce; the third is where most filers fall short. Capturing business purpose at the moment of the expense — a one-line note in your bookkeeping software or a category and memo on the receipt-capture app — converts a generic charge into a documented deduction that will withstand scrutiny three to six years later when memory has faded.
Worked example with numbers
Consider a sole prop with $100,000 in gross receipts and $30,000 in legitimate Schedule C deductions, including this category. Each additional $1,000 of qualifying expense reduces Schedule C net profit by $1,000, which reduces self-employment tax by approximately $1,000 × 92.35% × 15.3% ≈ $141, and reduces income tax by $1,000 × marginal rate. At a 22% federal marginal rate, the combined federal tax savings on each additional $1,000 of legitimate deduction is roughly $361, and state savings sit on top of that. The math is why disciplined categorization throughout the year pays for itself.