Stacking, Buying, and Deducting the Coverage
Excess above each line. A commercial umbrella sits over general liability, commercial auto, and employer’s liability. It does not extend over professional liability, cyber, or D&O, each of which needs its own excess layer if the primary limit is too low. Your personal umbrella covers none of the business stack.
Where to buy. Use an independent broker who places your profession every week; the endorsed programs of professional associations — the state bar, the medical society, the AICPA — often carry better forms than the open market. The online small-business marketplaces are fine for a low-risk consultancy buying $1M of E&O and a BOP, and a poor fit for anything with complex contracts. Much professional and cyber coverage is written by surplus-lines carriers, which no state guaranty fund backs if the carrier fails; an admitted carrier’s claims are backed, usually up to $300,000 a claim and $500,000 in California. With a surplus-lines carrier the rating is the only protection you have, so insist on A.M. Best A- or better.
Deducting it. Premiums for business coverage are ordinary and necessary expenses under IRC §162, “Trade or business expenses”, deducted by the entity or on Schedule C. A few items work differently. Life insurance on which the business is a beneficiary is never deductible, as above. Your own disability premium should be paid with after-tax money even where a deduction is available, because after-tax premiums buy a tax-free benefit (section “The Contract Terms That Actually Matter at High Incomes”); BOE premiums, by contrast, are deductible and their benefits taxable (Rev. Rul. 55-264). Money set aside to self-insure is not deductible at all — only losses actually paid are — which is the whole tax case for a captive, and the reason the promoted ones end up in Tax Court (section “Captive Insurance”). On timing, the 12-month rule lets a cash-basis business deduct a one-year policy paid in December, provided coverage starts no later than January 1 (section “Operational Deductions and Family Employment”).