Article 64 outlines the provisions for adjusting Value Added Tax (VAT) due to bad debts. A registered supplier may reduce their Output Tax for a current tax period to correct tax paid in a previous period if specific conditions are met. These include the supply being made and tax paid, the consideration being written off as a bad debt, a period of over six months passing since the supply date, and the recipient being formally notified. Correspondingly, the recipient must reduce their recoverable Input Tax for the current period if they have not paid the consideration for over six months and have been notified by the supplier.