I'm a software developer in Buenos Aires. I will be billing a company in the UK.
I can make electronic invoices (in the Argentina's IRS equivalent web page) or pre-printed invoices filled by hand, that do not need to be presented to IRS or at least in a wide time window (months).
So my question is, when I invoice a company in another country, can I use a pre-printed paper invoice? Or is there some particular form or electronic document that I would need to use to comply with their reporting requirements?