Your first month with a US LLC: what to expect week by week

30 days, 4 milestones: EIN, Mercury, ITIN and BOI Report. You have just formed your LLC and now it is time to activate it: here is exactly what happens during the first month in order.

The first 30 days after forming an LLC cover 4 critical milestones: receiving the Articles of Organization, getting the EIN, opening a Mercury account, and signing the Operating Agreement.

You've formed your LLC. Now what? Here's exactly what happens during your first month. week by week.

Week 1: Bank account setup

The first priority after LLC formation is opening your Mercury account. At Exentax, we coordinate this immediately:

We submit your Mercury application with complete LLC documentation (Articles of Organization, EIN CP 575, Operating Agreement)
Mercury reviews and approves (typically 1-3 business days)
You receive access to your dashboard with account number, routing number, and virtual debit card
Physical debit card ships within 7-10 days

By end of Week 1, you typically have a functional US bank account ready to receive payments.

Week 2: Payment infrastructure setup

With your bank account active, you configure your payment channels:

Stripe: Set up your Stripe account, connect to Mercury, customize your payment settings
PayPal Business: Create your business account, verify your identity (ITIN required for full verification)
Wise Business: Open multi-currency account, connect for currency conversion
Wallester: Set up virtual cards for business subscriptions (one per service for tracking)
Slash: Configure corporate treasury for yield on idle cash
Invoice templates: Create professional invoice templates with your LLC details

All these platforms connect directly to your Mercury account.

Week 3: First invoices

Your LLC is operational. You start billing clients from your new LLC entity:

Invoice includes:

Your LLC name
Registered agent address
Your EIN
Banking details for payment (routing number + account number for ACH/wire, or Stripe payment link)
Service description
Amount (USD)

The invoice goes out without VAT: US LLCs don't charge European VAT on international business services.

Week 4: Routine established

By end of month one, you have:

Active Mercury account receiving payments
Stripe processing cards
Wise Business ready for currency conversion
Wallester cards active for subscriptions
Slash configured for treasury
Invoices going out from the LLC
Clear separation between personal and business finances
Dashboard visibility of your business finances

Week-by-week timeline

First month FAQ

"Can I withdraw money from the LLC?"

Yes. Transfer from Mercury to your personal account (called an Owner's Draw). Document it as a distribution. We record it for Form 5472. Keep a log: date, amount, description.

"Do my invoices need to be in English?"

Not required, but recommended for international clients. Include your LLC name, registered address, EIN, and payment details regardless of language.

"When do tax savings start?"

From your first LLC invoice. The savings materialize when you file taxes in your home country with the optimized income structure.

"What if I change my mind?"

You can dissolve the LLC at any time. But after seeing the actual numbers, nobody ever has.

"What happens if Mercury asks for more documents?"

Don't worry, this is normal. Mercury may ask for additional verification (source of funds, business description). Respond within 24-48 hours with clear information. At Exentax, we help you prepare responses.

"Can I use the LLC immediately for existing clients?"

Yes. You can start billing existing clients from your LLC right away. Simply issue new invoices from the LLC and provide your Mercury banking details for payment.

Setting up your record-keeping system

From day one, establish a simple but effective system for tracking everything:

Create these folders in Google Drive (or similar):

LLC Formation/: Articles, EIN letter, Operating Agreement, BOI confirmation
Banking/: Monthly Mercury statements, Wise statements
Invoices/: All invoices issued, organized by month
Expenses/: Receipts organized by category (software, services, equipment, travel)
Distributions/: Log of every Owner's Draw (date, amount, purpose)
Tax/: Form 5472 copies, Form 7004, FBAR

Monthly routine (10 minutes):

Download Mercury statement → Banking folder
Review expenses match Wallester card records
Update distribution log if you took an Owner's Draw
File any new invoices or receipts

Why this matters: When Form 5472 time comes, you'll have everything organized. No scrambling, no stress, no guesswork. Your Exentax team can prepare your filings quickly because the data is clean.

If something in this structure left you wanting more detail, ACH vs wire transfer: payment timelines and what they mean for your LLC cash flow and How to scale your digital business with a US LLC dive into neighbouring pieces of the puzzle we usually keep for separate write-ups.

First month checklist

Book your strategic consultation. Let's get your first month started on the right foot.

Legal and regulatory references

This article relies on rules currently in force. Main sources for verification:

United States. Treas. Reg. §301.7701-3 (entity classification / check-the-box); IRC §882 (tax on foreign income effectively connected with a US trade or business); IRC §871 (FDAP and withholding on non-residents); IRC §6038A and Treas. Reg. §1.6038A-2 (Form 5472 for 25% foreign-owned and foreign-owned disregarded entities); IRC §7701(b) (tax residency, substantial presence test); 31 U.S.C. §5336 (Corporate Transparency Act, BOI Report to FinCEN).
Spain. Law 35/2006 (LIRPF), arts. 8, 9 (residency), 87 (income attribution), 91 (CFC for individuals); Law 27/2014 (LIS), art. 100 (CFC for companies); Law 58/2003 (LGT), arts. 15 (anti-abuse) and 16 (simulation); Law 5/2022 (Form 720 penalty regime after CJEU C-788/19 of 27/01/2022); RD 1065/2007 (Forms 232 and 720); Order HFP/887/2023 (Form 721 crypto). We close it with you from Exentax: one call, the filing goes out, the archive is set, and the risk stays on paper.
Spain–US treaty. BOE of 22/12/1990 (original DTT); Protocol in force since 27/11/2019 (passive income, limitation on benefits).
EU / OECD. Directive (EU) 2011/16, amended by DAC6 (cross-border arrangements), DAC7 (Directive (EU) 2021/514, digital platforms) and DAC8 (crypto-assets); Directive (EU) 2016/1164 (ATAD: CFC, exit tax, hybrid mismatches); OECD Common Reporting Standard (CRS).
International framework. OECD Model Convention, art. 5 (permanent establishment) and Commentaries; BEPS Action 5 (economic substance); FATF Recommendation 24 (beneficial ownership).

Applying any of these rules to your specific case depends on your tax residency, the LLC's activity and the documentation you keep. This content is informational and does not replace personalized professional advice.

A balanced banking stack: Mercury, Relay, Slash and Wise

There is no perfect account for an LLC. There is the right stack, where each tool plays a role:

Mercury (operated as a fintech with partner banks (Choice Financial Group and Evolve Bank & Trust primarily; Column N.A. on legacy accounts), FDIC via sweep network up to the current limit). Main operating account for non-residents with strong UX, ACH and wires. Still one of the most proven options to open from outside the US.
Relay (backed by Thread Bank, FDIC). Excellent backup account and for envelope-style budgeting: up to 20 sub-accounts and 50 debit cards, deep QuickBooks and Xero integration. If Mercury blocks or asks for KYC review, Relay keeps your operations running.
Slash (backed by Column N.A. (federally chartered, FDIC)). Banking built for online operators: instant virtual cards by vendor, granular spend controls, cashback on digital advertising. The natural complement when you manage Meta Ads, Google Ads or SaaS subscriptions.
Wise Business (multi-currency EMI, not a bank). To collect and pay in EUR, GBP, USD and other currencies with local bank details and mid-market FX. Does not replace a real US account but is unbeatable for international treasury.
Wallester / Revolut Business. Wallester provides corporate cards on a dedicated BIN for high volume. Revolut Business works as a European complement, not as the LLC's main account.

The realistic recommendation: Mercury + Relay as backup + Slash for ad operations + Wise for FX treasury. This setup minimizes block risk and reduces real cost. At Exentax we open and configure this stack as part of incorporation.

Next steps

Now that you have the full context, the natural next step is to map it against your own situation: what fits, what doesn't, and where the nuances depend on your residency, your activity and your volume. A quick review of your specific case usually saves a lot of noise before taking any structural decision.

Banking and tax facts worth clarifying

Fintech and CRS information evolves; here is the current state:

Before going further, put numbers on your case: the Exentax calculator compares, in under 2 minutes, your current tax bill with what you would carry running a US LLC properly declared in your country of residence.

> Start today, 100% online

Notes by provider

Mercury operates with several federally chartered partner banks and FDIC coverage via sweep network: mainly Choice Financial Group and Evolve Bank & Trust, with Column N.A. still in some legacy accounts. Mercury is not itself a bank; it is a fintech platform backed by those partner banks. If Mercury closes an account, the balance is typically returned by paper check mailed to the account holder's registered address, which can be a serious operational problem for non-residents; keep a secondary account (Relay, Wise Business, etc.) as contingency.
Wise ships two clearly different products: Wise Personal and Wise Business. For an LLC you must open Wise Business, not the personal account. Important CRS nuance: a Wise Business held by a US LLC sits outside CRS because the account holder is a US entity and the US is not a CRS participant; the USD side operates via Wise US Inc. (FATCA perimeter, not CRS). In contrast, a Wise Personal opened by an individual tax-resident in Spain or another CRS jurisdiction does trigger CRS reporting via Wise Europe SA (Belgium) on that individual. Opening Wise for your LLC does not bring you into CRS through the LLC; a separate Wise Personal in your own name as a CRS-resident individual does report.
Wallester (Estonia) is a European financial entity with an EMI/issuing-bank licence. Its European IBAN accounts are within the Common Reporting Standard (CRS) and therefore trigger automatic reporting to the tax administration of the holder's country of residence.
Payoneer operates through European entities (Payoneer Europe Ltd, Ireland) that are also in scope for CRS for clients resident in participating jurisdictions.
Revolut Business: when paired with a US LLC, it operates under Revolut Technologies Inc. with Lead Bank as its US banking partner. The account delivered is a US account (routing + account number); no European IBAN is issued to a US LLC. The European IBANs (Lithuanian, Belgian) belong to Revolut Bank UAB and are issued to European clients of the group. If you are offered a European IBAN tied to your LLC, confirm exactly which legal entity holds that account and which regime it reports under.
Zero tax: no LLC structure delivers "zero tax" if you live in a country with CFC/tax transparency or income attribution rules. What you achieve is no double taxation and correct reporting at residence, not elimination.

First month with your LLC: what to expect (and what NOT to expect) in the initial 30 days

The first month with your LLC is a mix of bureaucratic waiting and operational decisions. Coming from the YouTube narrative expecting "I open and start invoicing", you will get frustrated. Coming prepared with a realistic calendar, everything flows. Here is what really happens, week by week.

Week 1: formation and immediate EIN. Articles of Organization filed (Wyoming/Delaware/New Mexico, per case) with approval in 24-72h. EIN requested via SS-4 fax or online - online only for residents with SSN, so for non-residents 2-4 weeks by fax (or 24h with EA express service). No EIN, no bank; no bank, no Stripe.
Week 2-3: bank account and fintech onboarding. Mercury usually approves in 3-7 days with clean documentation (Articles + EIN + passport + utility bill + clear activity description). Wise USD in parallel as backup. Relay and Brex as third option. The real bottleneck: bank rejects are frequent and the solution is uploading additional documentation, not insisting.
Week 3-4: Stripe, bookkeeping and operating agreement. Stripe connects with US account and EIN; approval in 2-5 days if website is operational and product description specific. Operating agreement signed and filed (not submitted to anyone but required by banks and future investors). Bookkeeping started from day 1 with QuickBooks/Xero/Wave + bank reconciliation.
What does NOT happen the first month. You do not invoice significant volume (clients take time to migrate), you have no banking history for credit, you are not yet "operating with full legal certainty" (missing first 1120/5472 and BOI report). It is construction, not production.

What we are asked the most

Can I invoice before having a bank account? Technically yes, with LLC invoice and collection to a bridge account. Operationally discouraged: breaks patrimonial separation and complicates bookkeeping from the start.

How long until I recover the initial investment? Depends on model, but if the LLC opens Stripe USD you did not have or a US corporate contract you could not sign, usually 1-3 months. Opened "just in case" without clear use case: you do not recover - that is why we model upfront.

At Exentax we accompany the initial 30 days with weekly calendar, expedited EIN handling and bank mediation when rejected - so the first month ends with operational LLC, not opened-and-blocked LLC.

Legal & procedural facts

FinCEN and IRS reporting requirements moved recently; the current state is:

BOI / Corporate Transparency Act: your LLC is NOT required to file (a competitive advantage). After FinCEN's March 2025 interim final rule, the BOI Report obligation was narrowed to "foreign reporting companies" (entities formed OUTSIDE the US and registered to do business in a state). A US-formed LLC owned by a non-resident does NOT file the BOI Report: one fewer filing on your calendar, less paperwork, and a cleaner structure than ever. If your LLC was formed before March 2025 and you already filed BOI, keep the acknowledgement. The regulatory status can change again: we monitor FinCEN.gov on every filing and, if the obligation comes back, we handle it at no extra cost. Current status verifiable at fincen.gov/boi.
Form 5472 + pro-forma 1120. For a Single-Member LLC owned by a non-resident, the final regulations of Treas. Reg. §1.6038A-1 (in force since 2017) treat the LLC as a corporation for 5472 purposes. Procedure: pro-forma Form 1120 (header only: name, address, EIN, tax year) with Form 5472 attached. It is filed by certified mail or fax to the IRS Service Center in Ogden, Utah, not e-filed via standard MeF. Due date: April 15; extension via Form 7004 to October 15. Penalty: $25,000 per form per year, plus $25,000 per additional 30 days of non-filing after IRS notice.
Substantive Form 1120. Only applies if the LLC has filed a check-the-box election to C-Corp (Form 8832): it then pays 21 % federal corporate tax and files a substantive 1120. A standard disregarded LLC does not file a substantive 1120 and does not pay federal corporate tax.
EIN and notice. Without an EIN you cannot file 5472 or BOI. The IRS does not warn before imposing penalties; you find out when an EIN is flagged or a later filing is rejected. This is where Exentax steps in: we file the form, archive the receipt and, if the authority asks, your answer is already on the desk.

Practical reminder

Each tax situation depends on your specific residency, the activity carried out and the contracts in force. The information here is general and does not replace personalised advice; check your particular case before taking structural decisions.

Editorial note

This article is updated yearly with regulatory changes that affect the structures discussed. If you spot an outdated reference, write to us and we will revise it in the next editorial cycle; we keep the publication date visible at the top of every post for full transparency.

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For state-specific details, see our Wyoming LLC service page with closed costs and timelines.

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