A 1099 notary signing agent in Delaware faces state rates reaching 6.6% on the same net profit that federal income tax and the full 15.3% self-employment tax already claim. Delaware hits its 6.6% top rate around $60,000, and Wilmington adds a 1.25% city wage tax, and every dollar of bond, seals and signing mileage you document on Schedule C cuts all three bills at once.