If I have to pay VAT, will this be a 25.5% payment for my total income

If you sell services or goods in Finland, you have to pay 25.5 % VAT for your total income. Note that you add VAT to your commercial invoices and maximum amount of VAT what you are obliged to pay to the tax administration is that amount what you get from your customer. Usually business operators have purchases for their business purposes. Those purchases include deductible VAT, which reduces total payable VAT. 

Read more: The general VAT rate rises to 25.5% starting 1 September 2024