For the last few years, the path has been straightforward: form a US LLC, get an EIN, apply to Mercury, get approved within days, start operating. That’s still the path. What’s changed in 2026 is the conversion rate at every step — and which applications get through cleanly versus which sit in extended review.
This post is what we’re actually seeing as a third-party that prepares non-US founder bank applications, and what we now tell every founder to have ready before they hit “submit.”
What actually changed in 2026
Mercury hasn’t published a list of policy changes, so what follows is pattern recognition from our application volume, not official guidance. With that caveat:
Scrutiny on thinly-documented businesses
Applications that used to clear in a day now get pushed to extended review or denied if the business looks generic — a bare formation document, no website, vague business description, founder LinkedIn that doesn’t match the entity name. Mercury isn’t asking for more documents than before. They’re being less generous about filling in the gaps themselves.
Country-of-residence sensitivity
Mercury publishes a prohibited-country list, and that list is the first hard filter. Even within officially supported countries, some applications seem more likely to go into extended review than they were a couple of years ago. Founders in those cases need everything else in the application to be cleaner to compensate.
Post-approval review
We’re seeing more accounts that approve cleanly, then receive a follow-up KYC request 2–8 weeks in once real activity starts. This isn’t new, but the rate has gone up. Founders who set up Mercury and then sit on the account for months tend to attract more questions when activity finally arrives.
Why did the bar go up
A few interesting reasons, none of them Mercury-specific:
Regulatory pressure on fintech-bank partnerships
Mercury operates through partner banks — currently Choice Financial Group and Column N.A. The OCC and FDIC have visibly tightened expectations of bank-fintech BSA/AML programs over the last two years. When the bank gets stricter, the fintech in front of it gets stricter too.
The Synapse collapse fallout
When Synapse failed in mid-2024, every fintech-banking-as-a-service relationship in the US got a hard look from regulators. Mercury wasn’t a Synapse customer, but the entire category got more cautious about who and what they onboard.
Industry-wide tightening
This isn’t unique to Mercury. Wise, Brex, Relay, and traditional US business banks have all gotten harder for non-resident applicants over the same window. The whole funnel narrowed, not just one product.
What still works: the application checklist
This is the prep we now do with every founder before submitting.
Live website — not a coming-soon page, not a Notion link
- Real domain (yourcompany.com, not yourcompany.notion.site)
- Describes what the business actually does in clear English
- At minimum: home, about, what-you-sell, contact
- If you’re pre-product, a clear “what we’re building” page is better than nothing
LinkedIn that matches the application
- Your name on Mercury matches your LinkedIn name
- Your LinkedIn lists your role at the company
- The company has a basic LinkedIn page (free, 10 minutes)
Business description that’s specific
Bad: “We provide consulting services to international clients.”
Better: “We provide CRM implementation services to small US-based legal firms, billed hourly via Stripe.”
Mercury isn’t quizzing you. They’re checking whether the description matches everything else in the application.
EIN already issued
You need the EIN before applying, and ideally the original CP-575 letter. If you’ve lost it, request a 147C letter from the IRS first, then apply.
Real principal business address
Not your registered agent address. Mercury accepts a verifiable physical address in the US or abroad for where you actually operate. Registered agent addresses, P.O. boxes, UPS Store addresses, virtual addresses, and mail centers are not acceptable for that field.
Real phone number
US-based numbers preferred (Google Voice works, dedicated VOIP works). Same number on the website and LinkedIn.
Founder ID
Passport from your country of residence. Make sure the address you give Mercury matches the one on documents you’d use to verify.
Don’t apply through a VPN that masks your country
Mercury logs the application IP. A VPN that doesn’t match your stated country is the easiest way to trigger extended review.
Common rejection reasons we see
In the rough order of frequency:
- Generic or template-flavored business description. AI-written boilerplate that could apply to any consulting firm.
- Website is a placeholder or non-existent. The single most common avoidable issue.
- Founder name doesn’t match LinkedIn / passport / company documents. Often a transliteration issue (Chinese name in pinyin vs. legal English name on passport).
- Founder lives in a prohibited country or a high-scrutiny profile. The prohibited list is a hard stop.
- Industry mismatch with Mercury’s risk appetite. Crypto-adjacent, MSB-adjacent, certain marketplaces, certain dropshipping models.
- Single-member LLC with no online presence and no revenue. Mercury wants the bank to operate businesses.
Backup options if Mercury says no
What Mizu actually helps with
Mizu does not guarantee Mercury approval. What we help with is the prep most founders underestimate: getting the EIN in hand, checking whether the address setup fits the application, tightening the business description, making sure the website and founder profile line up, and choosing a fallback path if Mercury is not the right fit.
FAQ
Can Mizu guarantee Mercury approval?
No. Nobody can. What we do is prepare the application, so the avoidable rejection reasons are eliminated. Approval is still Mercury’s call.
How long does Mercury take to decide in 2026?
Mercury says many applications are reviewed within 1–2 business days. In practice, applications pushed to extended review can take longer — often several business days, sometimes 1–3 weeks or more.
Do I need to visit the US to open a Mercury account?
No. Mercury onboarding is fully online for non-US founders.
Wyoming or Delaware for a Mercury application?
Mercury accepts both. State choice is more about your overall LLC operating cost than the bank application itself.
Can I open Mercury before getting my EIN?
No. Mercury requires the EIN as part of the application.
