SIC codes are not a formality
You can select up to four SIC codes at incorporation, but banks, especially electronic money institutions, use them for automated risk scoring, and vague or mismatched codes such as generic 'other business activities' where the real trade is cryptocurrency or money remittance are a common reason non-resident applications get delayed or declined.
Codes can be updated later via the confirmation statement, but getting it right at incorporation avoids an early flag on your banking application. If your business genuinely spans two activities, list both rather than picking the closest single code.






