Русско-англо-русский юридический словарь

A value-added tax (VAT) or also General Sales tax (GST) is a form of consumption tax. From the perspective of the buyer, it is a tax on the purchase price. From that of the seller, it is a tax only on the value added to a product, material, or service, from an accounting point of view, by this stage of its manufacture or distribution. The manufacturer remits to the government the difference between these two amounts, and retains the rest for themselves to offset the taxes they had previously paid on the inputs. (Wikipedia)

Contractors shall allow a provider to rescind its consent to automatic recoupment or offset of underpayments and manual refunds, with further written notice to the contractor. (CMS Manual System)

If you want a noun referring specifically to reduction of the amount owed by debtor to creditor by some other amount that the creditor owes the debtor, use the noun setoff or set-off. While offset would not be a mistake setoff or set-off would be more precise. (the (new) legal writer)

What is the position regarding the offset of one debt against the other? (Cambridge Dictionary)