For month MM (MM is the month), you have less than 25.82€ to pay as VAT to tax authority.
According to Italian tax rules, if the amount to be paid on the VAT summary of a month MM is less than 25.82€, then the amount to be paid could be reported in the next VAT Return for month MM+1 (MM+1 is the next month).
SAP Business ByDesign
Reproducing the Issue
You do not see an option to postpone the payment of the VAT return to the next month.
This option is currently not available in SAP Business ByDesign system.
The carryforward of payment of taxes into the next month, if the amount is less than 25.82 euro, is just an "option" and "not an obligation".
This is not a frequent scenario (normally companies have to pay higher amounts of taxes) and therefore not planned for future releases.
If you would still like to have this option, then you may register your idea/requirement for this feature in the SAP Business ByDesign Ideas Forum, link available at:
The requirements posted here are taken up by development according to customer demand/ interest.
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Italy VAT Reporting , KBA , SRD-FIN-GLO-TAX , GLO - Tax Declaration , How To