What Inland Revenue says about electronic records
Inland Revenue's record-keeping guidance is short and direct. It tells businesses to keep all records, including those in electronic form, for at least seven tax years. The business.govt.nz guidance on keeping tax records says the same thing in plainer words: keep accurate records of your finances and hold on to them for seven years.
Electronic records are expected, not merely tolerated. Inland Revenue's guidance asks that records kept on a computer are kept in a format it can use. In practice that means a file Inland Revenue can open and read, not a proprietary export that only one piece of software understands, and not a scan so poor that the figures cannot be made out.
The overseas question
The point many firms miss sits in the same guidance. Inland Revenue says that if you store your records offshore, including through cloud computing, you should make sure either you or your cloud service provider has its approval. A great many popular cloud services run outside New Zealand, so this is worth checking for every system that acts as the home of your tax records, not just the obvious ones.
The practical step is to list where each category of record actually lives, then ask each provider whether it holds that approval, or ask your adviser how to seek it yourself. Inland Revenue is the authority on what it requires, so read its current guidance rather than relying on a summary, including this one.