Mettle Review UK 2026: Is This Free Business Account Worth It for Sole Traders?

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Introduction

Finding a genuinely free business account as a UK sole trader or freelancer is harder than it should be. Plenty of providers dangle a fee-free introductory period, only to start charging once you’re settled in. Mettle — NatWest’s digital business account — makes a bolder claim: free, and staying free, with a full accounting package thrown in.

So is it too good to be true? In this review, we look at exactly what Mettle offers in 2026, whether it’s really free, how your money is protected, who can (and can’t) open an account, and — crucially — the limitations that might make it the wrong fit. If you’re a sole trader or run a small limited company, this should tell you whether Mettle deserves a place in your business.

What Is Mettle?

Mettle is a free, app-based business account built by NatWest Group to compete with challenger banks like Tide, Starling, and ANNA. It’s aimed squarely at sole traders, freelancers, and small limited companies who want simple, low-cost money management without a monthly fee — and without the paperwork of a traditional business account.

The account is provided by National Westminster Bank plc trading as Mettle, so despite the app-first, challenger-style experience, it sits within a major high-street banking group. That backing matters, as we’ll see when we get to how your money is protected.

Is Mettle Really Free?

Yes — and this is genuinely one of its strongest selling points. A Mettle account has:

• No monthly account fee
• No charges for UK transfers
• No transaction fees for everyday payments

There’s also no paid tier — the account is simply free, with no premium upgrade to nudge you towards. For a freelancer or micro-business watching every cost, that’s a real draw, especially compared with traditional accounts that start free for a period and then begin charging.

How Is Your Money Protected? (FSCS)

This is where Mettle stands apart from many app-based competitors. Because Mettle runs on NatWest’s full UK banking licence — rather than operating as an e-money service with “safeguarding” — eligible deposits are protected by the Financial Services Compensation Scheme (FSCS) up to £120,000 (per Mettle’s own website, reflecting the increased FSCS limit).

That’s an important distinction. Many challenger and fintech business accounts hold your money under safeguarding rules, which protect your funds from being used for the provider’s own purposes but don’t give you the same FSCS protection if the provider becomes insolvent. Mettle gives you proper FSCS deposit protection — the same as a traditional bank.

One caveat: because Mettle is part of NatWest Group, the £120,000 limit is shared across any other NatWest Group accounts you hold. If you also bank with NatWest, RBS, or Ulster Bank, your total protection across all of them is capped at that single limit, not multiplied.

Free FreeAgent: The Standout Perk

Every Mettle account holder gets free access to FreeAgent, the well-regarded UK accounting software — as long as you make at least one transaction per month to keep it active. FreeAgent normally costs somewhere around £150–£190 a year for a sole trader, so this is a genuine, tangible saving, not a token add-on.

The integration is tight (FreeAgent is also owned by NatWest Group), so your Mettle transactions feed straight into FreeAgent, with invoices, VAT records, and expense receipts organised automatically. For a sole trader who was going to pay for accounting software anyway, the combined cost of banking and MTD-ready bookkeeping comes to £0 — which is a hard proposition to argue with.

Key Features

Beyond the free banking and free FreeAgent, Mettle includes a solid set of tools for running a small business from your phone:

• Mastercard debit card, with Apple Pay and Google Pay support
• In-app invoicing — create and send customised invoices, see what’s paid and outstanding, and chase late payers, all from the app
• Savings pots and a tax pot — set money aside for tax and other goals
• Automatic tax estimates — a running sense of what you might owe
• Real-time payment notifications
• Receipt capture via the FreeAgent integration

The app itself is well-rated on both iOS and Android, and onboarding is quick.

Note that Mettle doesn’t pay interest on your balance — so there’s no interest income to worry about, but also no return on money left sitting in the account.

Who Can Open a Mettle Account?

Eligibility is narrower than some competitors, so check carefully:

• Sole traders and limited companies with up to two owners — and only one owner can access the account.
• You must be 18 or over and a UK resident.
• Only one account per person.
• Not available to partnerships, LLPs, or charities.
• Some business types and regulated industries are excluded at the application stage, along with companies with complex ownership structures.

If you’re a partnership, an LLP, or a limited company with more than two owners, Mettle isn’t an option — NatWest’s main business account is the broader route in those cases.

(A note on availability: Mettle has at times restricted or paused new applications, and coverage of its current status varies. Before relying on it, check whether it’s open to new customers directly on Mettle’s website.)

The Limitations You Need to Know

Mettle’s simplicity is deliberate, but it means several things a growing business might need are simply absent:

• No overdraft or lending. There’s no credit facility of any kind. When your balance hits zero, that’s the limit.
• No cash deposits. If your business handles cash, Mettle can’t accommodate it.
• No cheque support.
• No international payments or multi-currency. If you pay overseas suppliers or invoice in other currencies, Mettle won’t help — you’d need a separate provider.
• No joint accounts, and only one person can access the account.
• No paid tier to grow into — if you outgrow the free account’s capabilities, you switch providers rather than upgrade.

None of these are dealbreakers for a straightforward, cash-positive freelance business — but they matter enormously if you need credit, handle cash, or trade internationally.

Who Is Mettle Best For?

Mettle is an excellent fit if you:

• Are a sole trader, freelancer, or small limited company (one or two owners)
• Want genuinely free banking with no monthly fee
• Were going to pay for accounting software anyway (the free FreeAgent alone can justify it)
• Run a cash-positive business with no need for an overdraft
• Take payments digitally rather than in cash, and don’t trade internationally

Look elsewhere if you:

• Need an overdraft, credit, or lending
• Handle physical cash or cheques
• Pay overseas suppliers or need multi-currency
• Are a partnership, LLP, or charity
• Want the option to grow into a fuller service with the same provider

How Mettle Compares

• NatWest’s main business account — the broader option from the same group, with branch access, overdrafts, lending, and cash handling. It starts free for a period, then charges a monthly fee, but takes partnerships and LLPs too (and runs the same FSCS cover and free FreeAgent).
• Tide, Starling, ANNA — other popular digital business accounts. Some offer features Mettle lacks (cash deposits via the Post Office, international payments, or built-in admin tools), though several charge fees for those extras. Starling notably holds a full banking licence with FSCS protection too.

If your priority is zero-cost banking plus free bookkeeping for a simple business, Mettle is hard to beat. If you need cash handling, credit, or FX, one of the alternatives may suit you better.

A Note on Tax

Mettle is a bank account, not a tax tool — but the income you process through it is, of course, taxable: Income Tax through Self Assessment for sole traders, or Corporation Tax for limited companies. The real tax benefit is the bundled FreeAgent, which helps you track taxable income and expenses through the year and keep Making Tax Digital-ready records, so your return is far less painful when it’s due.

FAQ

Is Mettle actually free?

Yes. Mettle charges no monthly account fee, no UK transfer fees, and no transaction charges, and there’s no paid tier. It also includes free FreeAgent accounting software (worth around £150–£190 a year) as long as you make at least one transaction a month.

Is my money safe with Mettle?

Yes. Because Mettle operates on NatWest’s full banking licence rather than as an e-money service, eligible deposits are protected by the FSCS up to £120,000 (per Mettle’s site). Note that this limit is shared with any other NatWest Group accounts you hold, so it isn’t multiplied across them.

Who can open a Mettle account?

Mettle is available to UK-based sole traders and limited companies with up to two owners (only one owner can access the account). You must be 18 or over and a UK resident. It’s not available to partnerships, LLPs, or charities, and some business types are excluded. It’s worth checking current availability on Mettle’s site before applying.

What are the main downsides of Mettle?

The biggest limitations are no overdraft or lending, no cash deposits, no cheque support, and no international or multi-currency payments. It’s also limited to sole traders and small limited companies, with no joint accounts and no paid tier to upgrade to. For a simple, cash-positive digital business it’s excellent; for one needing credit, cash handling, or FX, it falls short.

Conclusion

For the right business, Mettle is one of the best free business accounts in the UK — and the bundled FreeAgent tips it from “good” to “genuinely compelling.” Zero banking fees, proper FSCS protection through NatWest, and free accounting software that would otherwise cost you £150–£190 a year add up to a package that’s hard to argue with for a sole trader or small limited company.

The catch is what it deliberately leaves out: no borrowing, no cash or cheques, no international payments, and no room for partnerships or LLPs. If any of those are essential to how you work, Mettle isn’t for you. But if you’re a straightforward, cash-positive freelance or micro-business that was going to pay for bookkeeping software anyway, it’s a genuinely excellent — and genuinely free — choice. Just confirm it’s open to new applications before you set your heart on it.

This article is for general information only and does not constitute financial advice. Account terms, FSCS limits, features, and eligibility can change — always confirm current details directly with Mettle before opening an account.