The best tax tools for freelancers and the self-employed in 2026 — books that teach you to keep more of what you earn, and the invoicing, accounting, and mileage tools that run the business side, plus my own Kollaz spreadsheets built for self-employed money. Every pick is something I'd recommend to a freelancer friend starting from zero. Disclosure: this list contains affiliate links. If you buy through them, I may earn a commission at no extra cost to you.