Please consult the overview below from the Tax Agency to check which % of IRPF to withhold, either as employer, or as Autonomo. Employers should ask their employees to fill out MODELO 145 as they need information about their personal circumstances to be able to apply the correct %. You can only download the form through the Spanish version of the website. Link HERE.
Note the considerably lower retentions for starting Autonomo´s since July 2015.
Please note that for Autonomos on invoices relating to 2017 the general percentage to retain is 15%, and for those just starting, 7% in the year they first registered plus two following years.
Small change in the percentage of retention percentage for those that rent or rent out commercial property. As of 1.1.2017 the IRPF retention should be 19%.
The Tax Agency now has introduced a IRPF retention calculator on their website.