What is Fator R in the CLT vs PJ comparison?
It is the ratio between the payroll paid over the last 12 months and the gross revenue accumulated over the same period. The rule, added to Lei Complementar 123/2006 by Lei Complementar 155/2016, uses that number to decide whether a service provider falls under Anexo III or Anexo V of Simples Nacional, which changes the monthly tax slip even when revenue stays the same.
Why do the 13th salary and vacation bonus factor into the CLT annual comparison?
Because neither one shows up on an ordinary month's paycheck: the 13th salary, established by Lei 4.090/1962, has its income tax calculated separately on its own value, and the constitutional one-third vacation bonus, from article 7, XVII of the Federal Constitution, only arrives in the month the employee actually takes vacation. Adding up just twelve monthly net paychecks understates what CLT pays out over the full year.
Does FGTS count as part of the monthly take-home pay?
No. FGTS, governed by Lei 8.036/1990, is deposited into an account held in the worker's name and never passes through the salary they spend each month; the calculator only adds that amount to the annual total when the include-FGTS option is checked, precisely so the two are never confused.
Does PJ always pay less tax and net more than CLT?
There is no such guarantee. The outcome depends on the revenue tier, which Simples Nacional annex applies, and how much of the revenue becomes pro-labore; when PJ revenue is not much higher than the CLT gross salary, the deductions on pro-labore and the DAS slip can leave CLT ahead, as one of the examples above shows.