Verisure – deductibility of monthly subscription

120% is not possible in Dexxter anyway, is that even possible for sole proprietors? I think it is for companies, but is it also possible for sole proprietors?

But 120% won't work in Dexxtern, so be sure to take the professional use percentage into account ;)

I was searching for that too, and found another blog post where Dexxter itself provides an answer; I'll rephrase it here:

Go to the Reports / Income & expenses menu.

At the top right, there is a "manual input" button where you can add a separate entry (cost category, amount, description). There, you can enter an extra 20% for costs that can be deducted at more than 100%.