3 types of documents you should always archive for your business purposes:
1) Sales and purchase invoices - without them you won't be able to submit tax returns and won't be able to prove that you have borne any costs
2) Your contracts with clients and suppliers - they keep you safe in case of disputes and controls
3) Bank statements - they present real money flow and validate all transactions.
💡 Pro tip: keep both a paper and an electronic version (scan/photo), preferably in the cloud. This way, you'll never lose anything and it's easier to collaborate with your accountant.
And how do you store your company documents? Paper, Excel, or maybe an app?