Keeping business and personal money separate

When you start a business, it’s tempting to run everything through the account you already have. It feels simpler. But as the business grows, a single account with personal shopping, client payments and business costs all mixed together quickly becomes hard to manage.

Here’s why keeping the two apart matters, what tends to go wrong when they mix, and how to tidy things up if they already have.

Why it matters

Your records need to show what your business earned and what it spent. If every transaction runs through one account, you or your bookkeeper have to sort personal items from business ones before you can even start. That takes time, and every judgement call is a chance for something to be missed or counted twice.

Clear records also matter if HMRC ever asks questions. Being able to show that an account is used only for the business makes it much easier to explain your figures. GOV.UK sets out the records you need to keep if you’re self-employed and the records a limited company must keep.

Sole traders and limited companies

If you’re a sole trader, you and your business are the same legal person, so the money is all yours. Even so, a separate account for business income and costs makes your records much easier to keep, and makes it simpler to work out your profit for your Self Assessment return.

If you run a limited company, the position is different. The company is a separate legal person, and the money in its account belongs to the company. You can take money out as salary, as dividends from available profits, as a repayment of expenses or as a loan, but each needs to be recorded properly. Paying personal costs from the company account without a clear record can build up a director’s loan, with tax consequences for you and the company.

What goes wrong when money mixes

• Missed costs. Business purchases made on a personal card get forgotten, so you pay more tax than you need to.
• Wrong claims. Personal spending ends up in the business records and is claimed by mistake.
• Unclear income. Transfers between your own accounts look like business income, or real income is missed.
• A poor picture of the business. When the figures are mixed, it’s hard to see how the business is really doing.
• More work at the year-end. Sorting a year of mixed transactions takes far longer than keeping them apart from the start.

Setting things up well

• Open a dedicated business account and use it only for business income and costs.
• Use a separate card for business spending, and keep receipts.
• Pay yourself by regular, recorded transfers: drawings if you’re a sole trader, or salary and dividends from a company.
• Use bookkeeping software linked to the business account, and reconcile it regularly.
• If you use something partly for business and partly personally, such as a phone or your home, agree a sensible basis for splitting the cost and keep a note of it.

Tidying up if they’ve already mixed

If your accounts are already mixed, don’t panic. Download the statements for the period, go through each transaction and mark it as business or personal, with a short note where it isn’t obvious. Gather receipts for the business items. Then open a separate account and start using it from a clear date, so the problem doesn’t grow.

If you run a company and personal costs have gone through the company account, list them separately. They may need to be treated as a director’s loan, salary or dividend, and the right answer depends on the facts. It’s worth asking us before you make any adjustments.

Sources

Our main sources are HMRC and GOV.UK:

• Business records if you’re self-employed
• Running a limited company: company and accounting records
• Director’s loans

Talk to us about your bookkeeping

We can help you set up your accounts so business and personal money stay apart, and help you tidy up records that have already mixed. Call us on 020 7164 0225, send us a WhatsApp message or email us at info@ibandco.co.uk.

You can also read about our bookkeeping services.

First published 13 August 2024. Tax content checked on 9 October 2026. This article reflects the rules at the date it was first published. Where something has changed since, we’ve added an update note. Rules and rates change, so please check with us before acting.

Please note: this article is general information based on our understanding of UK tax rules at the date shown above. It is not advice for your circumstances, and tax rules and rates can change. Please speak to us before acting on it.