Another great example of how the UK handles things differently in a way that shifts the filing burden off the taxpayer is charitable tax deductions.
In the US taxpayers track their charitable giving and use it to reduce their taxable income at filing time.
In the UK when you donate to a charity you attest to that charity that you are a UK taxpayer and that the donation is therefore gift aid eligible, and the charity just goes to the tax office and collects an extra 25% on top of the donation.
So in the US, say, you earn $150, pay $50 in tax withholding, then donate $100 to a charity, then claim the donation to the IRS to say you shouldn’t be taxed on $100 of your earnings, so you should only have paid $30 in taxes, and you claim back $20. You have $20, charity has $100, taxman has $30.
In the UK you earn £150, pay £50 in PAYE, then give £80 to a charity, keeping £20 and telling the charity they can giftaid it. Charity goes to the taxman and asks for another £20. End result, you have £20, charity has £100, taxman has £30.
Essentially the same outcome - charity donations are tax advantaged - but the paperwork for taxpayers is much simpler.