Declaring taxes in Brazil (as MEI)

[#1]

Hi,

I'm new to Upwork and have landed a few jobs. I'm Brazilian, currently living in Brazil, and a MEI. How would I declare these payments? Do I need to file a NF every month? Or is it only necessary to declare annually?

I'm looking for other Brazilians who have been using Upwork as a source of income for a while. I saw another thread about this but it didn't clear up my doubts. 

Thanks!

[#2]

I am with same doubt, so comenting here to up topic and follow-up.

In additition I guess MEI is not enough for high gains, so what about declaring taxes as standard CNPJ in Brazil?

[#3]

If you need information about how to declare your taxes properly, it would be a good idea to hire an accountant. Even if another Brazillian freelancer happened to see your post and told you exactly what to do, would you really want to trust a total stranger to give you such important advice? You could end up paying a huge penalty if you get it wrong.