No.
Finnish law does not oblige a private trader to obtain a bank account for the business. Of course, for the entrepreneur's own financial management, it may be wise to set a separate bank account so that the company’s incomes and expenses can be easily seen from the same place, without the other personal money transactions confusing the view. However, for private trader company, the bank account does not have to be a corporate account, but a standard current account is also suitable for this purpose.
The UKKO Private Trader service is not linked to a corporate account, so the service can also be used by entrepreneurs who do not have a separate account for the company, and the business's incomes and expenses are easily kept in order when you remember to always add them to the UKKO service.