If you’re running a limited company, you’ll need to keep your personal and business accounts separate by law. However, if you’re self-employed, there’s no law that prevents you from using your personal account for your business.However, it’s best to keep your personal and business accounts separate. Whilst it’s ok to use your business account in an emergency, keeping separate accounts can help you to keep track of how your business is performing and make it easier when that all-important tax return deadline rolls around.