I wonder how many people actually bother claiming their home office as an expense for 2020. It's pretty easy to do (I did it), but the benefit isn't that massive and inaction is easier than action. The standard flat deduction for "work-related expenses" is 750 euro and you can bump that to 900 euro if you worked remotely for >50% of the year's workdays.

Of course, if you actually incurred more expenses (and kept track), you can claim that, but I have my doubts about most people doing it.