Spent 10 minutes with my SO, moving our shared deductions between us to see which distribution resulted in the lowest amount of taxes. Turns out that the tax authorities are pretty good at what they do, as the best distribution was what they’d already prefilled.

Despite having very different income, no matter how we moved the numbers, the numbers at the bottom didn’t change in a manner where the total would result in a higher refund.

So we both ended up filing our taxes with no changes to the prefilled values.

EDIT:
TIL that the Norwegian tax authorities appear to have an official youtube channel. There you can see an example in English how it’s done. Can’t wait for them to have a youtube reaction face thumbnail or a collab with MrBeast.