this is where our use case differs. we have to file in both cases.
@lubos since you are planning something on this I will give you a heads-up for our use case.
for us your suggestion will work but we might have to create separate tax codes for the same. the list of tax codes is already 48 now and this will be doubled.
while we do have purchases from suppliers which cannot be claimed as input credit, we also have goods and services where the tax on them are irrecoverable. so a supplier would invoice a mix of goods and service where input can or cannot be claimed.
my idea is to have a flag which links the tax codes components with inventory and non inventory. a simple flag with Y/N options for input tax credit.
as a default, tax components will have Y selected for tax components.
users would select N on tax components for use cases where tax codes are irrecoverable as a whole.
users will select Y or N for their inventory and non-inventory items. this flag will have higher priority than the flag on tax components. since Manager already has ability to select custom expense accounts for inventory and non inventory, just enabling selection of Liabilities account will work.
if my suggestion to select custom income and expense accounts for tax components is also implemented, i am confident we can reduce the present number of tax codes for my country by half.