Your first month with a US LLC: activate it without chaos
The first month decides whether the LLC becomes an operating structure or a folder of PDFs: EIN, Operating Agreement, banking, ITIN if needed and BOI only if applicable.
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 Mercury account area 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
- 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 LLC 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
- Slash configured for treasury
- Invoices going out from the LLC
- Clear separation between personal and business finances
- Clear visibility over your business finances
Week-by-week timeline
| Week | What happens | Who does it |
|---|---|---|
| Week 1 | Mercury approved. Account access, routing number, virtual card | Exentax coordinates |
| Week 3 | First client invoices from LLC. First real payments arrive | You invoice, Mercury receives |
| Week 4 | Routine established. Clean financial separation. Organized finance view | You operate, we monitor |
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
- 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, <a href="/en/blog/ach-vs-wire-llc-payment-timing-and-cash-flow">ACH vs wire transfer: payment timelines and what they mean for your LLC cash flow</a> and <a href="/en/blog/scale-your-digital-business-cleanly-with-a-us-llc">How to scale your digital business with a US LLC</a> dive into neighbouring pieces of the puzzle we usually keep for separate write-ups.
First month checklist
| Task | Status | Notes |
|---|---|---|
| Mercury account approved | ☐ | Typically 1-5 business days |
| Virtual debit card received | ☐ | Immediate upon approval |
| Physical debit card received | ☐ | 7-10 days after approval |
| Stripe account configured | ☐ | Connected to Mercury |
| Wise Business opened | ☐ | Multi-currency configured |
| Slash treasury configured | ☐ | Idle cash generating yield |
| Invoice template prepared | ☐ | LLC name, EIN, banking details |
| Record-keeping system set up | ☐ | Google Drive folders created |
| First invoice sent | ☐ | You're officially operating! |
Book your strategic consultation. Let's get your first month started on the right foot.
The first month after formation is about sequencing: documents, EIN, banking, payments, records and compliance calendar. This guide is general; the exact order changes with the provider, state and owner profile.
Open banking only after the formation file is coherent
The first month should leave banking organised: primary account, backup, usage rules and documents ready:
- The first month is about controlled sequencing. Do not apply everywhere at once. Get EIN, documents, business description, website consistency and expected flow clear before opening accounts.
- Set a primary operating route and a backup. New LLCs should avoid depending on one inbox, one account and one card. Continuity matters when onboarding takes longer than expected.
- Prepare the first compliance answers. What does the company sell, who owns it, where are clients, how will funds move, and why does the LLC need this provider? Those answers should be ready.
- Exentax turns account opening into a file, not a guess. The client sees what is ready, what is pending and which provider fits the initial operating model.
The first month should produce order: documents collected, EIN tracked, banking prepared, obligations scheduled and the operating story written down. That is the moment to set standards before the LLC starts accumulating messy history.
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- Mercury: can help with USD collections, but it requires documentary discipline. Exentax reviews activity, invoices, payment provider, support account and narrative before depending on it.
- Payoneer operates through European entities (Payoneer Europe Ltd, Ireland) that are also in scope for CRS for clients resident in participating jurisdictions.
FinCEN and <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> reporting requirements moved recently; the current state is:
- EIN and notice. Without an EIN you cannot file Form 5472. The IRS does not warn before imposing penalties; you find out when an EIN is flagged or a later filing is rejected. The Exentax approach is practical: confirm the data, prepare the evidence and close the next step.