If your business turnover exceeds the VAT threshold set by HM Revenue and Customs, you must register for VAT. In the UK, VAT registration is compulsory once your taxable turnover passes the government limit within a 12-month period. Even if your turnover is below the threshold, voluntary registration can benefit businesses by allowing them to reclaim VAT on purchases and improve credibility with larger clients. However, VAT registration also means additional record-keeping and regular VAT returns. Sole traders, partnerships, and limited companies should monitor their income carefully to avoid penalties. Check the latest VAT thresholds and guidance on HMRC before deciding.