The point in time specified in a contract when amounts are recalculated or apportioned between parties, so that economic risk and benefit shift in line with the deal. The term is descriptive rather than statutory: its precise effect depends on the agreement’s definition and drafting, and it is not generally fixed by legislation or case law.In property transactions, the adjustment date is the date from which outgoings and income (for example, rent, service charge, insurance, utilities and local taxes/rates) are apportioned between seller and buyer. Usage is broadly consistent across the UK and Ireland, though terminology varies: in Scotland “adjustment date” commonly coincides with the date of entry; in England & Wales and Northern Ireland it is often the completion or apportionment date; in Ireland it is usually the closing or apportionment date.In corporate/M&A documentation, the adjustment date often anchors completion accounts or price adjustments (for example, net debt and working capital measured as at that date), and should be distinguished from any locked-box date.Practically, the adjustment date should align with the intended economic transfer, be clearly defined, and be supported by robust apportionment and evidence provisions to reduce completion and post-completion disputes.