Prepaid daily income

Definitely, just enter it on the day they pay, easy! Those daily receipts for private individuals... The tax authorities are already happy that you report them, one of their inspectors literally said that during an inspection in the past!!! Of course, they won't say that officially :D Thank you. I thought you also had to take the date of execution into account very specifically, but in hindsight, that seems to be a minor issue. It's the pennies that count for the tax authorities ;)

Well, yes, in theory you probably need to know the date of execution at least (or make a note of it somewhere), but in practice...

As you say, it's the pennies that count, that's nicely put.