Private trader taxation

As a private trader, you pay taxes on your earned income through tax prepayments (ennakkovero). The tax prepayments are based on an estimate of the company’s yearly income, which is made at the beginning of the calendar year. 

If the estimate of your company’s income is too low and you have paid too little tax, you can request changes to your prepayment amount. If too much advance tax has been paid, the overpayment will be returned as a tax refund.