Rather have this calculated for you?
kontora generates your tax forms box by box, tells you how much to set aside and reminds you before every deadline.
Cuota de autónomos (monthly self-employed contribution)
The cuota de autónomos is the monthly payment made to social security for being registered under RETA. The amount depends on the net-income bracket you choose, and it is collected by direct debit at the end of each month.