This will be simple. I will have a personal bank account with my fictional bank. I will have a Swiss bank account for my holdings of more than $250,000. I will also have an account for every company I will have. Since the bank account will be under separate names, I could keep everything with FSP Bank. I will also need to make LibreOffice Calc my friend. Since I will be having multiple incoming transactions from multiple sources to multiple companies, I will need to justify every transaction, and make sure one of my companies is not eating into the income of another company. This will be the hard thing as accounts have to be justified, and this will make me earn my 10% profits.