As part of running a business, you need to keep track of records related to your taxable business activities.
You must keep all your records easily accessible for at least seven years so you can provide them to Inland Revenue if you're audited.
You need to keep all records, whether they're electronic or paper-based, for at least seven years.
The records you may need to keep include:
Keeping records (external link) — Inland Revenue
For more information about record-keeping and claiming expenses, check out these Inland Revenue guides:
Smart business (external link) (IR320)
Avoid these common record-keeping pitfalls: