Where a business makes both taxable and exempt revenue, not all input VAT can be recovered, and the calculations for it must accurately reflect how costs are used across the business. Major shifts in how a business operates can materially alter recovery percentages, too. For example, new revenue streams that may be exempt from VAT recovery will complicate what can be recovered. Partial exemption issues often arise without being immediately visible in sectors such as health, education, and financial services. Regardless of what is or isn’t recoverable, HMRC expects the method used to be fair and reasonable and may challenge results that distort the true financial position of the business. Regular reviews carried out by experts reduce the risk of cumulative under- or over-claims.