I am currently working for a UK organisation who pay me in £s into an International bank account and then I transfer my income into my French bank account in euros. Last month I declared the amount I transferred into my French bank account however after I realised that there was a small admin fee and it was probably more correct to declare the amount I received on the day I got paid which I could evidence on the remittance slip the organisation send me when they pay me.
When making my declarations I obviously need to put the amount in euros. However due to fluctuating exchange rates this amount can change from the date I invoice, to the date the organisation pays me to the day I transfer the money into my French bank account.
Which data should I use for my declaration?