Business Banking

Mercury vs Monzo Business: Which Should You Use?

A practical comparison of features, pricing, ease of use, best use cases and value for money.

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Quick verdict

Best overall

Mercury

Best for beginners

Monzo Business

Best value

Monzo Business

Best for professionals

Mercury

Best free option

Monzo Business

Final recommendation

US-incorporated and raising or planning to raise: Mercury. UK-registered and banking in sterling: Monzo Business. The two rarely compete for the same company.

Side-by-side

Mercury vs Monzo Business at a glance

Criteria	Mercury	Monzo Business
Eligibility	US-incorporated companies	UK-registered businesses and sole traders
Regulatory model	Fintech platform with partner banks	UK-licensed bank
Deposit protection	Via partner banks on documented terms	Eligible deposits under the UK protection framework
Primary currency	USD	GBP
Sub-accounts	Sub-accounts with permissions	Pots
Team access and roles	Granular	Multi-user on the paid tier
Virtual cards	Per vendor or per subscription	Available
API access	Yes	No public business API
Accounting integrations	US-oriented stack	UK-oriented stack
Cash handling	No	Limited via partner networks
CTA	Try Mercury →	Try Monzo Business →

Choose Mercury if…

Choose Mercury if you are US-incorporated, want sub-accounts and per-vendor virtual cards, need finance-team permissions, or want an API to automate reconciliation.

Choose Monzo Business if…

Choose Monzo Business if you are UK-registered, want the reassurance of a licensed UK bank, and value Pots automating tax and VAT set-aside.

Feature-by-feature breakdown

The details that matter

Feature	Mercury	Monzo Business
Startup and investor readiness	Primary strength	Not the focus
Licensed-bank status	Partner-bank model	Primary strength
Tax and VAT discipline	Sub-accounts	Primary strength (Pots)
Automation and API	Primary strength	Not available
Multi-currency	Limited	Limited
Everyday UK banking	Not applicable	Primary strength

Pricing comparison

What you'll actually pay

Mercury publishes a free core account with paid tiers for expanded finance workflows; Monzo Business publishes a free tier and a paid tier that adds multi-user access and integrations. Both change plan terms and both charge separately for international payments. Read the current pricing page for your entity type rather than relying on any figure quoted elsewhere.

Pricing changes frequently, so always check the official website before subscribing.

Pros and cons

What we liked and didn't

Mercury — Pros

Documented onboarding for US-incorporated companies with non-resident founders
Sub-accounts, granular permissions and virtual cards per vendor
API and integrations finance teams can automate against
Bill pay, invoicing and clean accounting exports

Mercury — Cons

Not a bank — deposits sit with partner banks under documented terms
Eligibility oriented around US-incorporated entities
Multi-currency holding and FX are not the focus

Monzo Business — Pros

UK banking licence, so eligible deposits fall under the UK protection framework
Pots automate tax, VAT and payroll set-aside
Clean feed, receipt capture and UK accounting integrations
Multi-user access on the paid tier

Monzo Business — Cons

UK-only eligibility
International payments and multi-currency holding are not its strength
Limited lending and treasury products

Final verdict

The bottom line

Choose Mercury if…

Choose Mercury for US-incorporated startups running real finance operations.

Choose Monzo Business if…

Choose Monzo Business for UK companies wanting a licensed bank with disciplined tax provisioning.

The Tool Money Lab Verdict

Our editorial call on Mercury vs Monzo Business

After spending real time with both Mercury and Monzo Business, our editorial view is that these tools solve overlapping problems in very different ways. Mercury is built for us-incorporated startups managing a runway., while Monzo Business is aimed at uk sole traders and limited companies banking in sterling.. Neither is objectively "better" — the right answer depends on the work you actually do, not on which product has the flashier launch video.

Mercury takes the edge on our internal scorecard (89/100 vs 86/100), but that headline number hides the nuance. Mercury tends to win on documented onboarding for us-incorporated companies with non-resident founders, while Monzo Business pulls ahead on uk banking licence, so eligible deposits fall under the uk protection framework. If your workflow leans heavily into either of those, the "winner" for you changes.

Our recommendation is to pick the tool that matches the way you already work, rather than the one with the broader marketing footprint. The gap between them is not large enough to justify fighting your own habits — but it is large enough that the wrong choice will cost you time every day for months.

We recommend Mercury to…

US-incorporated startups managing a runway

We recommend Monzo Business to…

UK sole traders
limited companies banking in sterling

Where Mercury clearly wins

Documented onboarding for US-incorporated companies with non-resident founders
Sub-accounts, granular permissions and virtual cards per vendor
API and integrations finance teams can automate against

Where Monzo Business clearly wins

UK banking licence, so eligible deposits fall under the UK protection framework
Pots automate tax, VAT and payroll set-aside
Clean feed, receipt capture and UK accounting integrations

Trade-offs to know

Mercury: Not a bank — deposits sit with partner banks under documented terms
Monzo Business: UK-only eligibility

Value for money

On pure value, Mercury currently offers the stronger price-to-capability ratio for its target audience, but Monzo Business remains the better spend when its speciality is the deciding factor.

Overall recommendation

Most readers should start with Mercury for us-incorporated startups managing a runway., and consider Monzo Business when uk sole traders and limited companies banking in sterling. is the dominant use case.

Why we made this recommendation

How The Tool Money Lab evaluates every comparison

Every comparison published by The Tool Money Lab is written by editors who use these products in day-to-day work. We weigh the factors below against the reader profile the comparison is aimed at, and we call out situations where the affiliate-linked product is NOT the right choice. Where we have used a product extensively ourselves — Lovable is the clearest example, since this site is built with it — we disclose that in the review. Where a recommendation includes affiliate links, we may earn a commission when you sign up, at no additional cost to you. Affiliate relationships never change the editorial conclusion: if the paid product is worse for you, we say so.

Features

Ease of use

Performance

Reliability

Security

Privacy

Value for money

Business suitability

Ecosystem

Customer support

Long-term usability

Commercial model

Real-world testing where applicable

Independent research

Disclosure: pages on The Tool Money Lab may contain affiliate links. We may earn a commission when you sign up through them, at no additional cost to you. Affiliate relationships never change our editorial conclusion — if a paid product is the wrong choice for you, we say so.

Try them yourself

Business Banking

Mercury

Startup banking for US-incorporated companies, with permissions and an API.

Best for: US-incorporated startups managing a runway.

Try Mercury →Read review

Business Banking

Monzo Business

UK business current account from a licensed bank, with Pots for tax discipline.

Best for: UK sole traders and limited companies banking in sterling.

Try Monzo Business →Read review

Disclosure: We may earn a commission if you sign up through links on this page, at no additional cost to you. Our comparisons remain independent and based on practical testing.

Frequently asked

Mercury vs Monzo Business FAQ

Can a UK company open a Mercury account?+

Mercury's documented eligibility centres on US-incorporated entities. A UK company would generally need a US subsidiary or US incorporation. Check Mercury's current eligibility page before assuming either way.

Can a US company open Monzo Business?+

No. Monzo Business is for UK-registered businesses and sole traders.

Is Mercury a bank?+

No. Mercury is a financial technology company; deposits are held with partner banks, and the pass-through insurance arrangements are documented on its site. Monzo holds a UK banking licence, so eligible deposits sit under the UK protection framework directly.

Which is better for holding several currencies?+

Neither. Both are single-currency-first. If multi-currency holding is central, look at Revolut Business or Wise Business instead.

Do transatlantic companies use both?+

Yes — a US parent on Mercury with a UK subsidiary on Monzo Business is a normal structure. Keep the entities' books separate and move money between them as documented intercompany transfers.

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