It really is that good - as a Swede, you get your prepared statement (and unless you've done a major or irregular thing in the past year, like buying a house, or trading stock on an exchange outside the European Union) that prepared statement is correct.
Part of the statement says "If you agree without modifications, just text 1234234 to the number 1234454".
And a few seconds later you get a reply SMS that confirms that your taxes are indeed filed for this year.
And a few seconds later you get a reply SMS that confirms that your taxes are indeed filed for this year.
Done. Simple. And awesome :)