This Practice Note is about the VAT domestic reverse charge (DRC) for building and construction work, introduced on 1 March 2021. Why does this matter? The reverse charge has significant accounting and verification implications for building contractors and similar businesses, and potentially for their customers. It has cashflow implications, and there is a very real risk of businesses being charged VAT incorrectly, and being exposed to assessments and penalties if they try to recover it as input tax. Vigilance is needed, and the position will often need to be checked before payments are made. Many points are best addressed upfront, in construction contracts. What is a reverse charge? A reverse charge is a mechanism where the customer, rather than the supplier, accounts for any VAT due. Customers therefore pay only net amounts to their suppliers, and suppliers should not add VAT to their charges. Although the general reverse charge for building work was only introduced in 2021, there were already similar mechanisms for dealings in certain items, such as mobile phones and