The Swedish tax agency is very different from the American IRS, or at least the impression I have of the irs as a Swede who's never been to the USA for longer than it takes to switch flights, but consumes a likely unhealthy amount of social media which is typically full of Americans.
In Sweden, the tax authority kinda do your tax fillings for you. They send them to you electronically once per year, and give you the chance to correct any inaccuracies, add any information they might have missed etc, and then sign the final result.
I don't think I'm the only one who signs those declarations without even reading them. Regardless of who is currently prime minister, the tax agency typically get it right, and I trust them enough to just accept what they say, and attach my legally binding signature without reading.
I'd estimate about 95% of my Swedish friends do the same.