The article is about the UK, where that's the case for about 2/3rds of taxpayers. Unless something's gone wrong, there's usually no bill or refund involved eith

The article is about the UK, where that's the case for about 2/3rds of taxpayers. Unless something's gone wrong, there's usually no bill or refund involved either: the tax authority and employers communicate to try and keep the amount deducted from pay correct. The people who do have to file return are those with more complex affairs that can't be dealt with automatically yet (for example, the self-employed and landlords).