E&O coverage is not optional for most brokerages; many states require it as a condition of the license, and no sane broker supervises agents without it. The tax code treats it accordingly: protection for the business is a cost of the business.
E&O premiums go on Schedule C Line 15
For a sole proprietor or single-member LLC broker, E&O premiums are deducted on Schedule C Line 15, the insurance line, in the year paid. A brokerage taxed as a partnership or S corporation deducts the premium on its own return before profit flows to the owners. The deduction covers the whole E&O ecosystem: the base policy, higher-limit endorsements, tail coverage when you switch carriers or wind down, and cyber or fraud riders bundled with the policy. If you prepay a multi-year policy, spread the deduction across the years it covers; a 12-month policy paid up front is deductible when paid.
Claim costs are deductible too. Your policy deductible on a claim, legal fees the carrier does not cover, and a settlement paid out of pocket for a business dispute are all business expenses, though anything resembling a fine or penalty paid to a government is specifically nondeductible.
Insurance the brokerage can and cannot deduct
E&O rarely travels alone. General liability for the office, workers compensation for staff, commercial auto for a brokerage-owned vehicle, employment practices liability, and a business umbrella policy are all deductible on the same principle. Health insurance for the owner follows different mechanics (the self-employed health insurance deduction on the 1040 rather than Schedule C), and here is the line that matters: premiums on your personal auto, homeowners policy, or personal umbrella are not brokerage deductions, even if the business benefits incidentally. Mixed-use items like an auto policy on a car used partly for showings get deducted only to the business-use percentage, and only if you use actual expenses rather than the standard mileage rate.
E&O you charge back to agents
Many brokerages buy a group E&O policy and recover the cost through per-agent fees or per-transaction chargebacks. Book this gross, not net: the full premium you pay is a deduction, and the chargebacks you collect from agents are brokerage income. The two rarely match to the dollar, and netting them hides income the IRS can see in your agent billing records. From the agent's side those chargebacks are their own deductible expense, which is one more reason clean per-agent billing statements are worth the admin.
The operational rule that makes all of this easy: pay every policy from the brokerage account, keep the declarations pages with your tax records, and let the books show insurance as its own category rather than buried in miscellaneous. A deduction this clean should never cost you a minute in an exam.