Mettle by NatWest
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Mettle is a business banking service operated by National Westminster Bank plc trading as Mettle, meaning it's backed by NatWest's own full UK banking licence and your deposits receive FSCS protection up to £120,000. This distinction matters because Mettle exists as a separate digital service from NatWest's traditional branch banking, with its own app and online platform, yet the regulatory foundation is NatWest's established banking licence, not an independent fintech's credentials. Opening a Mettle account is free, there are no transaction fees, and the service is built entirely around a mobile app with web access as a secondary interface. For self-employed people and small business owners who live on their phones, this mobile-first design is the fundamental appeal.
The account itself is straightforward: a sort code and account number that receive Faster Payments and direct debits, a debit card, and access through the Mettle app or web. Where the value emerges is in what's bundled around the basic account. Mettle includes invoice creation and payment tracking directly in the app, so when you raise an invoice, the app automatically matches incoming payments to that invoice when the client pays. Tax calculation is integrated through FreeAgent, a dedicated accounting and tax platform, with Mettle automating the categorization of business transactions into tax-reportable categories. If your spending is through the Mettle card, the app learns your regular merchant categories and starts auto-tagging transactions as business expenses, contractor payments, equipment, or tax, with corrections available on a transaction-by-transaction basis.
FreeAgent access is included free with Mettle if you maintain minimum monthly activity on the account. This is significant because FreeAgent is a commercial accounting product that many UK self-employed people pay for separately. The integration means you're not jumping between apps to record transactions; Mettle handles the day-to-day posting and tagging, and FreeAgent handles the accounting and tax compliance. For self-employed people managing invoices and receipts, the combination covers both daily bookkeeping and quarterly tax planning. FreeAgent includes tax estimations so you know your likely bill at year-end, quarterly income statements for planning, and the ability to file your Self Assessment directly from FreeAgent. You're not just banking with Mettle; you're getting the tax planning and compliance infrastructure that typically requires a separate software subscription.
Mettle also includes savings pots that earn 0.95 per cent AER, so you can earmark money toward quarterly tax bills or specific savings goals. The optional Mettle+ service adds £4 per month and includes additional features like quote generation and invoice customization, for business owners who need more polish in client-facing documents. For the core free offering, though, the combination of invoicing, payment matching, and tax categorization covers most freelancer and small business bookkeeping needs.
The eligibility criteria reflect Mettle's focus on small operators. You can be a sole trader or a limited company, but if you're a limited company you can have up to two owners maximum. This rules out larger partnerships but serves the most common small business structures: solo freelancers, a business owned by a partner, or a small company with one or two founders. Your account balance is capped at £1 million, which is rarely a practical constraint for small businesses but matters if you're a successful business holding substantial working capital. You must be UK-based and tax resident in the UK, and applicants are typically aged 18 or over.
What Mettle explicitly does not offer is worth noting. There's no overdraft facility if you need to smooth cash flow, no borrowing products, no international payments, and no ability to deposit cheques. These omissions reflect that Mettle is designed for digital-native small businesses, not as a replacement for every business banking need. A freelancer who occasionally receives client cheques would need a secondary account elsewhere, or would need to ask clients to pay electronically. A business that wants commercial lending to buy equipment or finance growth can't access that through Mettle.
The mobile-first design is genuine, not just marketing. The core account opening, invoicing, payment categorization, and tax estimation all work primarily through the app, with the web interface available but secondary. For self-employed people who invoice clients, check account balances, and categorize spending all from a phone, this is efficient: everything is in one place without logging into multiple apps or software. The automatic payment-to-invoice matching is particularly valuable, because it eliminates the manual step of reconciling payments to invoices, which is tedious at scale and error-prone if done by hand.
Compared to other business accounts, Mettle sits in a specific niche. It's simpler and cheaper than accounts from specialist business banks, because it has no lending, no relationship management, and no physical infrastructure. It's less flexible than some digital-only accounts that support multi-currency or international payments. It's more integrated than ultra-minimalist accounts that offer only a number and app access. The FreeAgent bundling is unusual: few business accounts include commercial tax software as standard, so the value proposition leans heavily on that integration. For self-employed people already planning to use FreeAgent anyway, the Mettle account effectively becomes free because you'd pay for FreeAgent separately. For those who don't use accounting software, the invoicing and tax categorization features in Mettle provide a simpler path to bookkeeping than starting from scratch.
NatWest's backing adds durability and integration possibilities. If you already use other NatWest services, existing customer relationships can inform support experiences, though Mettle operates as a distinct product with its own support team. The FSCS protection is identical to any UK bank account, so there's no regulatory compromise: your deposits are as protected as they would be in a traditional NatWest account, just through a separate digital platform.
Mettle by NatWest suits self-employed people and very small business owners, particularly those working as sole traders or running small limited companies with one or two owners. It's especially well-matched for freelancers or contractors who invoice clients regularly, because the invoicing and payment-matching features reduce bookkeeping friction, and the FreeAgent integration handles quarterly tax planning. It works well for business owners who live on mobile apps and want everything in one place. If you need to deposit cheques, access overdraft lending, do international payments, or operate a larger partnership, Mettle isn't equipped to serve that. For the narrow but significant group of digitally-native sole traders and small teams, Mettle delivers an integrated, free, and straightforward business account backed by a major UK bank.