And the Receita (IRS) app has an option to pre-fill the tax declaration form, which works wonders most of the times. It requires a manual review to certify that

And the Receita (IRS) app has an option to pre-fill the tax declaration form, which works wonders most of the times. It requires a manual review to certify that everything is correct, but from the times I had to declare my taxes (I'm living abroad so I don't have to do it anymore), it was as easy as loading the pre-filled details and just verifying if everything was correct.