Keeping a separate business bank account gives you clean records, makes your tax position far easier to evidence, and protects the legal separation between you and a limited company. It also matters directly when you borrow: lenders read bank statements closely, and mixed personal and business spending makes the business harder to assess.
For a limited company it is not optional in practice. Company money belongs to the company, and paying personal costs from it creates director’s loan account issues your accountant then has to unpick. Blurring the line also weakens the argument that the company is genuinely a separate entity.
Sole traders are in a different position legally — there is no requirement to hold a separate business account — but most personal account terms do not permit business use, and separating the two is still the sensible approach. It makes Self Assessment straightforward and gives you a clear trading record to show funders.
From an underwriting point of view, the difference is stark:
- A clean business account shows income, seasonality and how the business handles its commitments.
- A mixed account buries all of that under groceries, subscriptions and household bills, and underwriters tend to take the cautious reading.
- Returned direct debits and unarranged overdraft use are visible either way, and both count against you.
None of this is tax or accountancy advice — speak to your accountant about how to set the accounts up. Our part is what happens afterwards, when those statements go to a lender.