Hello,

according to Italian tax legislation, in cases of quarterly payments, any tax debt must be increased by 1% as interest. However, this interest is not displayed in the "Calc. and Post VAT Settlement" process.

Here the full Italian "Agenzia delle Entrate" link.

https://www.agenziaentrate.gov.it/portale/web/english/vat-periodic-payment-monthly-or-quarterly

as paragraph:

"Quarterly taxpayers

In the case of quarterly payment, any tax debt must be increased by 1% by way of interest.

Quarterly VAT returns can be chosen by taxpayers who in the previous calendar year, had a turnover not exceeding:"