Resources This section is a comprehensive resource for our clients, containing tax calculators, tax rates and deadlines, essential business factsheets, the latest news and more. Online calculators Includes calculators for mortgages, loans, APR, payslips, VAT, stamp duty, company car and fuel benefits.Tax calendar The online tax calendar shows the key tax deadlines.Tax rates & allowances The latest tax rates and allowances.Downloadable forms Some useful forms from HMRC and Companies House.