
ISO vs. NSO Stock Options: A Startup Employee's Tax Guide to AMT, 83(b), Early Exercise, and the $100K Limit
A practical tax playbook for startup employees holding ISOs or NSOs — covering AMT exposure via Form 6251 line 2i, the 30-day Section 83(b) deadline, the two-year-and-one-year qualifying disposition rule, the $100,000 first-exercisable ISO cap, and the 1099-B cost basis error that causes double taxation.










