If we could force one habit on every new sole trader, it wouldn't be a spreadsheet or a tax course — it'd be a separate business bank account, opened on day one. Mixing business and personal money is the single biggest cause of the year-two bookkeeping nightmare, and the easiest thing in the world to avoid. When people ask which account, we point them at Mettle, by NatWest. Here's why.
It's genuinely free
No monthly fee. For a sole trader — especially one just starting, or running a modest income — paying £5–£15 a month for a business account makes no sense when a free one from a major bank exists. That's £60–£180 a year that stays with you.
It's from NatWest, and protected
Mettle is provided by NatWest, FCA-regulated, with eligible funds protected by the FSCS. App-first and quick to open, but with a real bank behind it — no wondering whether your money's safe with a name you've never heard of.
It does your bookkeeping's heavy lifting
Mettle customers get FreeAgent free — and since FreeAgent is included in our packages too, your bank account and your bookkeeping software both cost you nothing on top of your fee. Transactions flow from Mettle into FreeAgent automatically, categorised, so the weekly bookkeeping is 15 minutes of tapping "approve" rather than an evening of data entry. Snap receipts on your phone, raise invoices in-app, and watch a live estimate of your tax bill build all year — no more January guessing.
The one catch
Mettle is for sole traders and companies with up to two owners. As a sole trader you're squarely in scope — but if you later take on a business partner or incorporate with several directors, the fit can change, and we'll flag it when it does.
The habit that saves the most
Everything downstream — clean books, maximised expenses, a stress-free tax return, easy Making Tax Digital filing — starts with business money living in its own account. A free Mettle account plus FreeAgent plus a named accountant is the whole setup, from £19 + VAT a month. Get started.
