help me with italian taxes..

help me with italian taxes..

Hi I'm Italian and we have multiple taxes and I can't get it work with zoho invoices..
I have generally 3 taxes: cnpaia (4%), iva (21%), and than ritenuta d'acconto (-20%)

this is the correct formula for 1000€

cnpaia: 40€
iva (1000 + 40) * 20%: 218.40€
ritenuta d'acconto: -200€
Total: 1058.40

this is my zoho taxes configuration:
my taxes group:
- cnpaia 4%
- iva 21% (stacked tax)
- ritenuta d'acconto -20%

zoho partials:
cnpaia: 40€
iva (1000 + 40 - 200) * 21%: 176.40€
ritenuta d'acconto: -200€
Total: 1016.40

Can you help me with the configuration?