In Finland personal taxes are pretty much automated. Every year I simply reviewed the taxation summary I automatically received in post, and accepted it by not

In Finland personal taxes are pretty much automated. Every year I simply reviewed the taxation summary I automatically received in post, and accepted it by not doing any corrections (which can be sent via online service, or via mail). So basically I wouldn't do anything at all. In half a year I'd either get returns, or would have to pay the missing taxes if I underpaid during the year. There are many cases where you would still do corrections, such as if you're owning a rental property and did some renovations there. Most of officially regulated things such as capital gains are usually automatically reported by your bank/stock holding service, though. This is in quite a stark contrast to places where there's a lobby to change the laws yearly to make sure citizens have to use professional services for declaring their taxes.