Mettle vs Starling vs Monzo Business: fees, FSCS, FreeAgent/Xero, and tax pots (2026/27)

If you are a UK sole trader, the “free” business account is rarely the expensive part. The expensive part is picking the wrong fee model, skipping FSCS checks, failing to sync FreeAgent or Xero, and mixing tax money with spending money.

This is a five-point comparison of Starling Business, Monzo Business, and Mettle. Education, not financial advice. Fees and product features change, so confirm live rates before you switch.

1. Monthly and transaction fees

Rule of thumb: UK Faster Payments only → Starling or Monzo core. 20–40 supplier payments a month → check Mettle’s allowance before you switch. Cash-heavy → Mettle. Regular foreign invoices → bank plus a proper FX conversion, not the bank alone.

2. FSCS protection

All three sit in the UK deposit-protection regime when they are authorised UK banks (or, for Mettle, the NatWest group). Eligible deposits are generally covered by the Financial Services Compensation Scheme up to £85,000 per person, per authorised institution.

• Starling and Monzo: check you are in a business current account with the UK bank entity, not a e-money wallet.

• Mettle: NatWest group. If you already hold a large personal NatWest/RBS balance, FSCS is per authorised firm, so combined balances can exceed the £85,000 cap even if the apps look separate.

Do not treat “app bank” as unprotected. Do not treat two brands in the same banking licence as two £85,000 pots. If your tax reserve plus operating cash is near the cap, split across separately authorised firms.

3. FreeAgent and Xero integration

The account only pays for itself if transactions land in your ledger without CSV archaeology.

• Starling: Marketplace connections to FreeAgent and Xero. Virtual cards help you separate subscriptions from the main debit card so the feed stays readable.

• Monzo Business: Straightforward Open Banking / accounting connections to FreeAgent, Xero, and similar. Instant spend alerts mean you catch a bad charge today instead of in FreeAgent six weeks later.

• Mettle: Built-in invoicing and bookkeeping-lite, and FreeAgent is in the same family. If your accountant already lives in FreeAgent, this is the path of least resistance. Do not also pay for Xero “just in case.”

Pick one bookkeeping home. Banking should follow the software your accountant already uses.

4. Sub-accounts and tax pots

VAT, Income Tax, and National Insurance sitting in the same pot as rent is how sole traders get a surprise bill, not a bank fee.

• Monzo Business: Pots are the product. Split tax, VAT, and operating without opening three banks. Best if you will actually open the app.

• Starling: Spaces / separate pots (and interest on balances has come and gone). A second account or space for a tax reserve is enough for most £30k–£250k traders.

• Mettle: Use a dedicated pot or a second account for tax. The NatWest backstop is useful; the app is less loved, so a pot you never look at is not a system.

A common working rule is 20–30% of profit into the tax pot, then adjust after your first Self Assessment. The bank did not charge you for mixing the money. HMRC will.

5. Who each account is actually for

A stack that usually works at this turnover: one UK current account (Starling or Monzo), one tax pot, Wise (or similar) only when a foreign invoice is large enough that 1% matters, and either FreeAgent or Xero, not both.

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Reply with your current setup: which of the three you use, whether FreeAgent or Xero is actually syncing, and whether you keep a tax pot. If two of these three fought in your last tax year, say which fee won.

The full banking, bookkeeping, and tax-stack walkthrough for UK sole traders is in The Confident Financial Tech Stack: The Toolkit: https://offstage-press.whop.site

Education, not financial advice. Confirm live fees, FSCS eligibility, and Open Banking connections before you move money.

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If you are a UK sole trader or freelancer turning over £30k to £250k, your business bank account is probably costing you more than the monthly fee (which is often £0). The real money leaks through FX markups, cash deposits, CHAPS, paid add-ons you did not need, and mixing tax money with spending money.

This is a practical breakdown of the three accounts most of us actually consider: Monzo Business, Starling Business, and Mettle. Not financial advice, just the fee traps people in this range keep walking into, and a question at the end so we can compare real stacks.

What actually costs sole traders money

Monthly account fees are the wrong thing to obsess over. All three of these can be run at £0 a month. The traps look like this:

1. FX and international invoices. A 1.5% to 3% markup on a £8,000 US or EU client invoice is £120 to £240, every time. One messy year of overseas clients can cost more than a paid accounting subscription.

2. Cash and cheques. Lodging cash through PayPoint, Post Office, or a high-street counter is rarely free. If you still take cash (markets, workshops, on-site work), this alone can decide the account.

3. CHAPS and same-day high-value payments. Property deposits, HMRC in a panic, or a supplier who will not take Faster Payments. These are the £10 to £25 "I only needed it once" charges that add up.

4. Paid extras sold as "business." Extra cards, expense workflows, invoicing add-ons, and "pro" tiers. Fine if you use them. Expensive if you turned them on in week one and forgot.

5. No tax pot. VAT, Income Tax, and National Insurance sitting in the same pot as rent and software. The bank did not charge you. HMRC will.

6. Using a personal account "for now." Banks can freeze or close it. HMRC also expects a clear record. The cheapest account is the one that does not get shut mid-filing season.

If your work is almost all UK Faster Payments, a free account plus a separate tax pot will beat a fancy stack. If you invoice overseas or take cash, the "free" account with a bad FX rate is the expensive one.

Monzo Business

Best for: sole traders who live in the app, like pots, and want spending alerts that actually get read.

Pros

• Proper business current account with a clean app. Pots make it easy to split tax, VAT, and operating cash without opening three banks.

• Instant notifications. For card-heavy freelancers this is the difference between catching a dodgy charge today and finding it in FreeAgent six weeks later.

• Expense cards and extra users exist if you later hire a VA or bookkeeper.

• Accounting connections (FreeAgent, Xero, and similar) are straightforward.

• Good fit if you already bank with Monzo personally and want the same muscle memory.

Cons and fee traps

• International payments and FX are where Monzo can quietly lose you money versus a specialist like Wise sitting alongside the account (not instead of a UK business account).

• Paid business extras are easy to switch on. If you only needed pots and a debit card, stay on the free core and ignore the upsell.

• Cash deposits are not Monzo's strength. If your week includes envelopes of notes, look elsewhere or use Monzo only as the spending account.

• Some people hit limits or extra checks as turnover grows. Annoying if a client payment lands on a Friday.

Who it saves money for: UK-only consultants, designers, coaches, and developers who get paid by Faster Payments, pay everything on card, and will actually use pots for tax.

Starling Business

Best for: the "one free account that just works" crowd. Still the default recommendation for a lot of £30k to £150k sole traders.

Pros

• No monthly fee, no minimum balance, UK Faster Payments in and out without nickel-and-diming.

• App quality and customer service have been the reason people stay, not the branding.

• Marketplace connections to FreeAgent, Xero, and others, plus virtual cards if you need to separate subscriptions from the main debit card.

• Interest on balances has come and gone in different periods. Even a small rate on a tax pot is free money you do not get in a current account that pays nothing.

• Sending and receiving internationally is built in. Check the rate on the day against Wise before you hit send on a large invoice.

Cons and fee traps

• CHAPS and some specialist payments are not free. Do not discover this when you are buying a used van.

• Cash deposits (PayPoint and similar) carry fees. Fine for the odd market weekend. Painful if cash is a real sales channel.

• FX is better than a high-street branch. It is not automatically the cheapest on a five-figure foreign invoice. Always compare.

• If you need a relationship manager, a lending conversation, or a branch, Starling will feel thin.

Who it saves money for: most UK freelancers in this turnover band who want one account, one card, and no monthly fee, with the option to add Wise only for the overseas invoices.

Mettle (NatWest)

Best for: sole traders who want a high-street group behind the app, and especially people already in (or about to join) FreeAgent.

Pros

• Free business account from the NatWest group. Useful if a landlord, payment processor, or accountant still side-eyes "neobanks."

• Built-in invoicing and bookkeeping-lite. For a simple sole trader this can delay the moment you pay for a full accounting package.

• FreeAgent sits in the same family. If your accountant lives in FreeAgent, Mettle is the path of least resistance.

• Cash and counter services via NatWest are a genuine advantage if you still handle notes or need a human.

Cons and fee traps

• Electronic payment allowances have historically been the sting: a handful of free outbound payments, then a per-payment charge. If you pay 20 to 40 suppliers a month, "free" Mettle can cost more than Starling very quickly. Check the current allowance before you switch.

• The app is less loved than Monzo or Starling. If you will not open it, you will not use the features that save you money.

• International and FX are not why you pick Mettle.

• Easy to overlap costs: Mettle invoicing plus FreeAgent plus Xero "just in case." Pick one bookkeeping home.

Who it saves money for: cash-taking trades, people whose accountant insists on FreeAgent, and anyone who wants NatWest rails without a full NatWest tariff.

Quick chooser

A stack that usually wins at this turnover

For a typical consultant or freelancer at £30k to £250k:

1. Starling or Monzo Business as the UK current account (free).

2. One tax pot (or a second account) for VAT and a rough Income Tax / NI set-aside. A common rule of thumb is 20% to 30% of profit, then adjust after your first Self Assessment.

3. Wise (or similar) only when a foreign invoice is large enough that 1% matters.

4. FreeAgent or Xero, not both. Banking choice should follow the software your accountant already uses, not the other way around.

The account that "saves the most fees" is almost never the one with the prettiest card. It is the one that matches how you get paid. UK Faster Payments: Starling or Monzo, no contest. Cash and FreeAgent: Mettle. Overseas clients: the bank plus a proper FX conversion, not the bank alone.

Fees and allowances move during the tax year, so treat the table as a map, not a price list. If a number has changed since you last checked, drop it below.

What stack are you on right now, and where are you still leaking fees? Bank, accounting tool, and the one charge that still annoys you. Especially useful if you have compared two of these three in the last year.

Stripe vs GoCardless in 2026/27: which one actually fits a UK sole trader?

If you invoice UK clients and sit in the £30K–£250K band, the choice is rarely “which brand is cooler.” It is who gets paid on time, what you pay per invoice, and whether the money lands in a business account your bookkeeping app can read.

Drop your current setup in the comments: Stripe only, GoCardless only, both, or something else.

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What each one is for

Stripe

Card and wallet checkout (Visa, Mastercard, Apple Pay, Google Pay). Best when a client wants to tap a link and pay now. Faster cash, higher fees.

GoCardless

UK Direct Debit collection. Best when the same client pays you every month (retainers, retainers-plus-hours, subscriptions). Lower fees, slower first collection, stronger for recurring.

Most freelancers over £50K end up needing both: Stripe for one-off project invoices, GoCardless for retainers.

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Pros and cons

Stripe

• Pros: same-day or next-day payouts, one-off invoices that do not need a mandate, works for overseas clients, Checkout / invoicing is simple.

• Cons: higher take-rate on every payment, chargebacks, clients who “pay by card then dispute,” extra FX cost if you quote in GBP and they pay from abroad.

GoCardless

• Pros: cheaper on repeat invoices, clients do not have to remember to click pay, fewer “I’ll do it Friday” delays, clean for retainers.

• Cons: first Direct Debit can take several working days, not useful for a one-off £2k project a new client wants to pay today, mandate setup friction, weaker if most of your work is overseas.

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2026/27 fee structures to compare (list prices, before any negotiated rates)

Always check the live pricing page before you quote a client. These are the public UK list rates to use as a working model:

Stripe (UK)

• UK/EEA consumer cards: typically 1.5% + 20p per successful charge

• UK/EEA commercial cards: typically 1.9% + 20p

• International cards: typically 2.5% + 20p (plus FX if you convert)

• Invoicing / Checkout: no extra platform fee on top of the processing rate for standard Stripe Invoicing

• Payouts to a UK bank: usually free on the standard schedule

Worked example: a £1,200 one-off invoice on a UK consumer card ≈ £18.20 in fees.

GoCardless (UK Direct Debit)

• Standard: typically 1% + 20p, often capped around £4 per UK Direct Debit

• Pro / Plus: lower percentage or a monthly plan if volume is high

• Failed or cancelled collections can carry a small admin fee

• First collection after mandate: plan for 3–5 working days, not same day

Worked example: the same £1,200 retainer on UK Direct Debit ≈ £4 if the cap applies, vs ~£18 on Stripe.

On a £2,000/month retainer for 12 months, that gap is hundreds of pounds. On ten one-off projects a year, Stripe’s speed often wins even if it costs more.

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A simple rule of thumb

• One-off project, new client, wants to pay this week → Stripe invoice

• Same client, same amount, every month → GoCardless mandate

• Mix of both, £80K+ turnover → run both, do not force one tool to do the other’s job

Pair either with one UK business current account (Starling, Monzo Business, or Mettle) and one bookkeeping app. Two payment tools plus three banks is how stacks get expensive.

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What are you using right now, and why? Stripe, GoCardless, bank transfer only, or a messy mix? Fees, payout timing, and client pushback are all useful.

Detailed app audits and setup workflows (what to connect, what to cut, how invoices hit your ledger) are mapped out in The Confident Financial Tech Stack guides.

Education, not financial advice. Fees change. Check the provider before you send the next invoice.