In the UK, most (all? Not sure) receipts will have the amount of VAT indicated (e.g. my Amazon orders list &quot;Total before VAT&quot;, &quot;VAT&quot;, and &quot;Grand Total&quot;). Pretty much everyone is aware of VAT AFAICT, and 20% of total gives you a reasonable estimate of what the VAT on an item is (bit of an over-estimate, and ignores items that have rates other than the default 20%, but generally good enough to get a reasonable idea).