A reasonable fraction of our customers come to us with a US LLC formed through Stripe Atlas. Atlas is a fine product — it does what it says: forms the entity, procures the EIN, opens a US bank account, and hands you a reasonably clean starting state. The 5472 piece lives outside Atlas’s scope, which is fine; the problem is that founders routinely assume otherwise.
Here is what we see most often when an Atlas-formed LLC lands at BorderFile.
1. The entity classification question
Atlas forms your LLC with a default US tax classification. For most non-US founders, that default is “disregarded entity” — the right choice. But Atlas also offers a “Delaware C-corp” option, which some founders pick because an investor asked them to or because they read a blog post about QSBS.
If you picked C-corp at formation, your 5472 picture is different. You file a real 1120, not a pro-forma, and the 5472 attaches to the real 1120. E-file is available (unlike the pro-forma case). The deadlines are the same.
The first question we ask any Atlas-formed customer is: “What box did you tick for tax classification?” Half the time the answer is “I don’t remember.” The CP 575 letter answers it — a C-corp CP 575 says “Form 1120” in the “Form(s) you must file” line; a disregarded-LLC CP 575 says nothing about 1120 directly.
2. The responsible-party field on the SS-4
Atlas handles the SS-4 for you. The responsible-party field has to be a natural person with a tax identifier. Atlas correctly puts you (the founder) in that field and uses your foreign tax ID (UTR, PAN, TRN, etc.) if you have one, or files the SS-4 with a “foreign — no ITIN” note if you do not.
Where this becomes a problem later: if your residency changes, or if you obtain an ITIN or SSN after formation, the IRS record still shows the original responsible-party TIN. For 5472 filing this does not matter directly — the 5472 asks you to report the current foreign TIN of the 25%+ owner, not what was on the SS-4 — but it means the IRS’s internal records about your LLC may lag your current situation by years.
Not a problem to solve immediately. A problem to be aware of if the IRS ever writes to you about something.
3. Mercury vs the Atlas-provided bank account
Atlas pairs with Mercury (and historically with other banks). The Atlas-provided Mercury account is fine; most founders keep it as the primary business account.
The 5472 gotcha is subtler: if you open a second US business account later (Wise USD, Payoneer, Relay, Brex, another Mercury sub-account), that second account’s statements are now part of your required 12-month coverage for the next 5472 filing. We regularly see Atlas founders who added a Wise account mid-year and forget to pull the Wise statements for their 5472 intake.
The specific advice: at year-end, make a one-line list of every account the LLC had activity on during the year. If you cannot list them all from memory, pull your Mercury transfers tab and look at every external account that received or sent money. Each of those is a candidate statement set to collect.
4. The Delaware registered agent
Atlas includes a Delaware registered agent — typically Harvard Business Services or a comparable provider — for the first year. The service renews annually; Atlas bills you.
What to watch: the renewal fee changes year to year. If you cancel Atlas’s subscription without arranging a replacement RA, your LLC loses its Delaware RA, and the state marks the entity “not in good standing” within a few months. Reinstatement is possible but costs a few hundred dollars and takes 2–3 weeks.
The 5472 interaction: your pro-forma 1120 wants a US address. Most Atlas-formed LLCs use the Harvard Business Services address because it is what Atlas provided. If you switched RAs since formation, make sure your new RA’s address is what we put on the pro-forma 1120. Correspondence from the IRS routes to the address on the filing; a stale address means a letter you never see.
5. The 83(b) distraction
Atlas-formed C-corps that issue founder stock sometimes come with the 83(b) election attached. The 83(b) is a timing election on the founder’s own personal US tax position; it is unrelated to the 5472.
Where this gets confused: founders occasionally skip filing 5472 one year because “we did the 83(b) and the accountant said everything was handled.” No. 83(b) is about the founder as an individual; 5472 is about the entity. Both filings exist independently. If you have a US tax adviser handling your personal position and a separate concern about the entity-level 5472, keep the two engagements separate.
6. The “Atlas took care of taxes” fallacy
Atlas is a formation service. It takes care of formation. It does not file your annual 5472, your Delaware franchise tax, or your 1099-NECs. The welcome email at formation says so, in a sentence most people do not read.
The specific moment where this becomes a crisis: year 2. In year 1, you were formed partway through the year, so your filings were straightforward or non-existent. In year 2, 15 April rolls around and you suddenly discover the 5472 is a thing. We get a lot of inbound email in April from Atlas-formed founders in exactly this situation.
The one setting at formation that saves grief
If you are forming now (via Atlas or any other service), pick the following defaults deliberately:
- Entity type: disregarded single-member LLC (unless an investor specifically asked for a C-corp)
- State: Delaware or Wyoming (both work; Delaware is more conventional)
- Registered agent: the one bundled with your formation service for year 1, with a reminder to review before renewal
- Responsible party on SS-4: you, with your foreign TIN
- Business address on filings: the registered agent’s US address
- Calendar year: yes, keep it standard — do not pick a non-December fiscal year end
- Bank account: one primary (Mercury is fine). Add a second only when you have a specific reason.
The pattern underneath this list: pick the boring, conventional default for every choice. Form 5472 preparation gets harder in direct proportion to how many “clever” structural choices you made at formation.
What to do if you are an Atlas-formed LLC on BorderFile
Our intake specifically asks about Atlas formations and the five points above. If you are 60 days or more from 15 April and want to confirm nothing is lurking, send us your CP 575 and your Delaware certificate of formation at support@borderfile.io. We’ll run both documents against our checklist in a day and tell you what to expect at your first 5472 filing.
Not tax advice. For specific legal or tax questions, book a demo and we’ll scope it with you.