Plain answers to the questions that decide what you owe — with the article of the Tax Code each one comes from.
Consulting, legal, medical and audit work are excluded from the 1% regime. Check whether your activity qualifies before you register — the list is not obvious.
Step by step through the rs.ge monthly Small Business declaration: every field, what goes in it, and the deadline. Filed by the 15th, even in a zero month.
The 3% does not apply only to the excess. It applies to everything from the first day of the month you crossed the cap, through year end. Worked example.