Mercury vs Brex for non-US founders (2026): both need a US entity — the difference is the admission test

These two get compared in every "best US business bank for founders abroad" list, usually with a scorecard. The scorecard is noise. Both companies require exactly the same upstream facts — a US-incorporated entity with an IRS-issued EIN — and they part ways on the test they apply to the humans and the numbers behind that entity. Mercury's binding test is where you live. Brex's binding test is what your company has achieved. Which one you can actually open is decided by that, not by feature tables.

The tests, side by side

Read the Brex column again if you skimmed it: the funding screen is not fine print. Brex says its products are "designed for companies that have or will soon reach some level of scale" — an equity investment of any amount (accelerator, angel, or VC), more than $500,000 a year in revenue, or a tech startup referred by an existing customer or partner. If you have raised, there is also a $50,000 minimum cash balance. You can still apply without funding — Brex says you may qualify for a business account with daily payments — but "may qualify" is doing real work in that sentence, and meeting the base requirements does not guarantee approval.

Mercury's screen is different in kind. Nobody asks your revenue. What Mercury enforces is the prohibited-countries list — and the trigger is where you live, not where your company is registered and not your passport. A founder in Lagos with a perfect Delaware LLC gets declined on residence; a founder in Bangalore or Manila with the same LLC does not, as of 2026-07. We walk the full application in how to open a Mercury account from abroad.

Pricing, as published

One structural difference the table can't show: these are different products. Mercury is a banking-and-operations account — the comparison that actually matters for its price is against other startup bank accounts. Brex at its core is a corporate card and spend platform; the account wraps the card. A $0 Essentials price on a card product and a $0 base price on a bank account are not the same offer, and the funding screens above are how each company prices its risk.

Two founders, two answers

Founder A: solo, Delaware LLC, pre-revenue, based in India. Every fact Brex screens for is absent — no investment, no revenue, no referral. Mercury's screens pass: residence is not on the prohibited list, the entity and EIN exist, the legal address comes from formation documents. The answer is Mercury, and the honest framing is that Brex was never a candidate — it wasn't a close call. The real bottleneck is upstream: the EIN. A founder whose principal place of business is outside the US cannot use the IRS online tool, and mailed applications take roughly four weeks. That sequencing — state, then EIN, then bank — is on the Mercury walkthrough and on our incorporation pillar.

Founder B: two founders in the US, YC-adjacent angel round closed, $120K in the bank. Now the screens flip. Brex's daily-payments criteria are met (equity investment of any amount) with the $50,000 minimum cash balance satisfied. The address test still bites if the company address is a registered-agent or virtual address — someone with real power at the company must be verifiably present in the US, which Founder B's US-resident co-founder satisfies. Either account is open to them; the choice is about card-and-spend tooling versus banking operations, not eligibility.

The founder in between: revenue is real but under $500K, no institutional funding. This is the uncomfortable middle. Brex's published criteria don't clearly cover you; you can apply and "may" qualify for daily payments, but build the plan on Mercury first and treat a Brex approval as upside.

What to do on Monday

• Before spending money on formation. Check your country of residence against Mercury's prohibited-countries list. This is the cheapest no in the entire US-banking pipeline — it costs nothing to read and four weeks of EIN waiting to discover.
• Pre-revenue or pre-funding. Apply to Mercury with your formation documents, the IRS-returned EIN document (CP575 or 147c), and a real physical operating address — international and residential is fine. Expect a decision in one to two business days once documents are in.
• Funded or scaling past $500K revenue. Brex becomes a real option, not a wishlist item. Prepare address documentation (a utility bill or bank statement from the last 3 months, or a lease from the past 2 years, showing the business or an owner's name) and expect the underwriting questions about source of funds and spending patterns.
• Whichever you open, remember the point of it. A US account is usually the missing rail behind your payouts. Where the money goes after it lands is the corridor problem — see how to receive Stripe payouts internationally for the three rails and what each costs.