This is exactly how it works here in The Netherlands.
Description below is from the podcast episode page:
> Back in 2005, a group in California decided we could make filing taxes dramatically simpler in the US as well. Lots of Americans could receive tax forms in the mail that were pre-filled out by the government. All they'd need to do is check for errors and send the forms back in.
> Joseph Bankman, a law professor at Stanford, thought this was such a no-brainer, that he offered to test out the idea with some California taxpayers. It turned out to be a huge success. Other states thought about using the plan. Even California's governor at the time, Arnold Schwarzenegger, supported it.
> Bankman thought getting ReadyReturn through the California legislature would be smooth sailing. He was wrong.
today for filling in your company or self assessment tax return there's a perfectly usable website on gov.uk (it's not perfect, but acceptable)
and for next year HMRC have just decided to... turn it off, offering no replacement whatsoever
you're supposed to pay a third party for to pay your tax, which is completely insane