@MostlyHarmless sales taxes and VAT are tied to revenue (even though in the case of VAT it's paid by the customer on paper the end effect is the same)
@jmcs @MostlyHarmless VAT is, as can be inferred from its name, based on value add, not revenue. Incoming minus outgoing.
@ahltorp @MostlyHarmless in most countries you can also deduct expenses you have with your work from the income tax.