It is the core of kontora: every invoice, expense, or bank movement generates its double-entry record, and the system refuses to save anything unbalanced, so your tax drafts come out of books that always balance. You (or your advisor) review and file the returns; kontora prepares the drafts and warns you about the deadlines.
Rather have this calculated for you?
kontora generates your tax forms box by box, tells you how much to set aside and reminds you before every deadline.