It’s highly recommended that you keep 7 years’ worth of bookkeeping record (6 years plus the current financial year). A HMRC investigation could happen at any time so it’s always best to keep everything. 7 years is an awful lot of boxes of paperwork so we recommend using a software to store things electronically. Apps like Dext Prepare/Commerce, Apron, Hubdoc, Pleo, Quickbooks, and Xero all store documents. Then there’s Dropbox, OneDrive, and Google Drive for the bits that your accounting apps may not store.