LLC & S-Corp Taxes 2026: How Your Is Taxed, What You Can Deduct, When to Elect Status, and Every Form Deadline for the 2026 Tax Year

Most books on small business taxes explain the rule and stop. This one runs the arithmetic to the last cent, on real profit levels, and shows the working.What does a dollar of profit actually cost you? Not your bracket. For a single filer in the 22 percent band it is 30.49 cents, and this book breaks that number into its four parts and shows you where each one comes from.Three federal changes reached small business owners this year, and the first one is the kind most readers have heard the old version of. The 20 percent qualified business income deduction did not expire at the end of 2025. It is permanent now, the phase-in range widened, and a minimum deduction arrived. One hundred percent bonus depreciation came back. The Form 1099-NEC threshold moved for the first time in decades.Inside: - Self-employment tax worked to the dollar, including the 92.35 percent step that most calculations skip- The qualified business income deduction as it stands for this tax year, with the 2026 thresholds and the phase-in range- The S-Corp election computed on three profit levels and three salary levels, so you can find your own line rather than take somebody's percentage- Why the saving from that election is overstated by about a third everywhere you read about it, and exactly where the missing part goes- Every deduction with the record it needs to survive a question, and the strict categories where an estimate is not accepted- Stock basis, Form 7203 and the accountable plan, which the books with S-Corp in the title leave out- Quarterly payments, the safe harbors, and the one that does not depend on predicting your year- The mileage rate that changed in the middle of 2026, and why a log without dates cannot produce the deduction any more- A chapter for members of a multi-member LLC: the K-1, self-employment tax from box 14, outside basis, and why a home office reaches a partner's return by a different route- One full year worked from January to the April after it, on a single business, with every figure carried throughWritten for the owner, not the adviser. Every dollar figure carries its year. Every rule carries the form or the section it comes from. Where two sources disagreed while this was being written, the book followed the form itself and says which one it followed.Our work is registering and administering companies, filed every working day. Where this book says what usually goes wrong, that is what we watch going wrong.