In Germany I’m required to convert the currency to EUR based on the transaction date against an official exchange rate: https://www.bundesfinanzministerium.de/W

In Germany I’m required to convert the currency to EUR based on the transaction date against an official exchange rate: https://www.bundesfinanzministerium.de/Web/DE/Themen/Steuern/Steuerarten/Umsatzsteuer/Umsatzsteuer_Umrechnungskurse/umsatzsteuer_umrechnungskurse.html https://www.bundesfinanzministerium.de/Web/DE/Themen/Steuern... for tax returns. I imagine that each country has their own rules.