Article 25 of the KSA Value Added Tax Law establishes the legislative basis for adjustments to tax invoices and tax returns. This provision mandates that the implementing Regulations will specify the precise terms and conditions required for such modifications. It covers two primary scenarios: the adjustment of the Consideration for a Supply as stated on the original Tax Invoices, and the amendment of a previously submitted Tax Return. The article effectively delegates the procedural and substantive requirements for these adjustments to the Regulations, ensuring a clear framework for correcting or updating tax liabilities post-filing or invoicing.