LLC mistakes: IRS, banking and asset protection

A US LLC weakens when the file is thin: missed Form 5472, unclear banking, mixed funds, BOI/FinCEN scope and a weak Operating Agreement.

About 70% of the problems we see daily in already-formed LLCs cluster on 5 fronts: missing Form 5472, BOI/FinCEN scope not reviewed, personal-funds commingling, lapsed Annual Report, and lost Registered Agent.

Based on our experience helping hundreds of LLC owners, these are the most common problems, and how to prevent them. Each one can cost you time, money, or both.

Most common problems

Problem 1: EIN delays blocking everything

What happens: The EIN process takes 4-8 weeks for non-residents. During this time, you can't open Mercury, set up Stripe, or issue invoices with your EIN.

Prevention: Start the EIN process immediately when you form the LLC. At Exentax, we file the EIN application simultaneously with the Articles of Organization, maximizing overlap time.

Problem 2: Mercury account rejection

What happens: Mercury rejects the application due to business type, documentation issues, or country of residence.

Prevention:

• Have complete documentation (Articles, EIN letter CP 575, Operating Agreement with Disregarded Entity classification)
• Describe your business clearly and accurately
• Ensure your industry isn't in Mercury's restricted list
• Have an active website or online presence
• Work with Exentax — we know what Mercury needs and how to present your case

If rejected, Relay (Thread Bank, FDIC) and Wise Business are alternatives.

Problem 3: Form 5472 missed. $25,000 penalty

The Exentax approach is practical: confirm the data, prepare the evidence and close the next step.

What happens: LLC owner doesn't know about Form 5472, doesn't file it, receives <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> penalty notice for $25,000 (IRC §6038A).

Prevention: Work with a formation service that includes annual compliance. Never assume you "don't need to file" without confirming with a professional. At Exentax, we file Form 5472 + Form 1120 automatically.

Problem 4: Commingling funds — piercing the corporate veil

What happens: Owner uses Mercury card for personal expenses, pays personal bills from LLC account. Tax time becomes a nightmare; corporate veil is at risk.

Problem 5: BOI / FinCEN scope not reviewed

What happens: Owner keeps operating from outdated BOI guidance and never documents whether the current FinCEN rule applies. That creates two bad outcomes: voluntary filings when they are not needed, or missed filings if the entity is actually a foreign reporting company.

Prevention: Check scope first. After FinCEN's March 2025 interim final rule, US-formed LLC owned by non-residents are generally out of BOI reporting. At Exentax we do not file BOI by default; we document the out-of-scope position or file/update only if your structure is actually in scope.

Problem 6: Registered agent lapses. LLC dissolved

What happens: Owner doesn't renew registered agent. State sends notice. If ignored, state dissolves the LLC administratively. Mercury may freeze the account.

Prevention: Use a formation service that includes registered agent renewal as part of annual maintenance. Never let it lapse.

Problem 7: Choosing the wrong state

What happens: Owner chooses Delaware because it "sounds prestigious," then discovers franchise tax — unnecessary for a simple freelancer business.

Prevention: Choose based on actual needs. For most freelancers: New Mexico (no state annual fees) or Wyoming (strongest asset protection (with annual report)).

Problem 8: Not updating platforms after changes

What happens: LLC address, ownership, or bank account changes, but Stripe/PayPal/Mercury/Wise aren't updated. Payments get rejected or complicated.

Prevention: Whenever anything changes in your LLC, update all connected accounts immediately. Also review whether the change affects BOI/FinCEN scope or a filing already on record.

Problem 9: Ignoring local tax obligations

What happens: Owner confuses conditional US federal treatment with "nothing to report anywhere" and does not declare income in the country of residence. The local tax file becomes exposed.

Prevention: Understand that US LLC may owe conditional US federal treatment, but you MUST declare in your country of residence. Work with both Exentax (US compliance) and a local tax advisor.

Problem 10: Not maintaining records throughout the year

What happens: Tax time arrives and owner has no organized records. Form 5472 preparation becomes expensive and stressful.

Prevention: Monthly routine: download Mercury statements, file expense receipts, track Owner's Draws in a simple spreadsheet. 10 minutes per month saves hours at tax time.

Problem 11: Using Wise as primary account

What happens: Owner keeps entire business treasury in Wise. Wise freezes account during compliance review. Owner has no backup and no FDIC protection.

Prevention: Build the banking stack by use case, not by habit: Relay or Slash for resilient US operations, Wise Business for international money movement, Stripe or IBKR when the activity needs them, and Mercury only when the client profile genuinely fits. Keep at least one active backup account with real movement and a clean KYC file.

Problem 12: Not having a backup account

What happens: Mercury conducts compliance review (normal, routine). Account is temporarily restricted for 1-3 weeks. Owner can't receive payments or pay expenses.

Prevention: Open Relay as backup from day one. Have Wise configured for alternative payment receipt.

Problem 13: FBAR not filed

What happens: LLC owner has US bank accounts with aggregate balance exceeding $10,000 at any point during the year and doesn't file FBAR (<a href="https://www.fincen.gov" target="_blank" rel="noopener">FinCEN</a> Form 114). Non-willful penalty: up to $12,909 per violation.

Prevention: File FBAR annually if your US account balances exceed $10,000. At Exentax, we track this and file automatically as part of annual maintenance.

Problem 14: Operating Agreement doesn't meet banking requirements

What happens: Standard Operating Agreement document (from LegalZoom, Inc Authority, etc.) lacks foreign owner provisions, Disregarded Entity classification, or manager-managed structure. Mercury, Stripe, and PayPal reject the application.

Prevention: Use a custom Operating Agreement drafted specifically for non-resident, single-member, Disregarded Entity LLC. At Exentax, every OA is customized for this specific use case.

Problem 15: Currency conversion losses

What happens: Owner converts USD to local currency through traditional banks charging 2-4% markup plus wire fees of $15-45. On $60,000/year, that's $1,200-2,400 lost to unnecessary fees.

Prevention: Use Wise Business for all currency conversions. Mid-market rate with transparent fees of 0.4-1.5%. On $60,000, you save $600-1,500/year compared to traditional banks.

Problem 16: Not having clear invoicing processes

What happens: Owner sends informal payment requests instead of professional invoices. Clients delay payment, disputes arise, and documentation for Form 5472 is incomplete.

Prevention: Create a professional invoice template with LLC name, EIN, Registered Agent address, Mercury payment details, and clear payment terms (Net 15 or Net 30). Use Mercury Invoicing, Stripe Invoicing, or FreshBooks.

Problem resolution: the complete guide

The operating-file approach

Think of your LLC as an operating file, not as a registration receipt. The strongest files are boring in the right way: deadlines tracked, bank flows labelled, owner movements documented and platform KYC consistent with invoices and the website. That discipline protects you from avoidable exposure:

• $25,000 per missed Form 5472
• avoidable BOI/FinCEN exposure when scope is not documented
• $12,909 per FBAR violation
• Account closure and frozen funds from banking issues

The review has to connect profit, withdrawals, distributions, personal expenses, retained funds and banking evidence. That is where an LLC stops being a registration receipt and becomes a defensible operating structure.

The annual cost of proper maintenance is a small fraction of any single penalty. More importantly, Exentax gives you a file that can be answered calmly if a bank, platform or tax authority asks questions.

Most LLC problems are avoidable when the file is maintained from day one. This guide helps spot common gaps; fixing them properly depends on what has already been filed, signed, paid or reported.

Three banking gaps that turn into larger problems

Many banking problems start by mixing tools, explaining activity poorly or depending on a single account:

• A common LLC problem is opening banking before the file is ready. The provider then asks for contracts, website, activity, invoices or source of funds, and the owner scrambles to invent a narrative.
• Another problem is having no fallback. If the only account is reviewed, cards stop, payouts pause and suppliers wait. A backup operating route should be part of the initial structure.
• Provider mismatch creates friction. A low-risk consulting LLC, an ecommerce seller and an ads-heavy media buyer need different account features and different supporting documents.
• Exentax prevents the predictable issues. We prepare the business description, document pack, account roles and response file before the first serious review happens.

Most LLC problems are preventable because they start as small gaps: a missing EIN letter, a vague activity description, personal spending, forgotten filings or weak banking evidence. Treat those gaps as operational tasks before they become expensive corrections.

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• Mercury: works best when the banking narrative is not improvised. The LLC should explain activity, clients, payment flows, beneficial owner and continuity if compliance reviews the account.

• Payoneer operates through European entities (Payoneer Europe Ltd, Ireland) that are also in scope for CRS for clients resident in participating jurisdictions.

Why most "common problems" trace back to three preventable habits

Most of the recurring problems that show up in LLC operated from abroad trace back, at the end of a calm review, to three preventable habits rather than to the structure itself. The first is mixing personal and operational expenses on the same payment instruments. The second is leaving the annual maintenance to memory rather than to a calendar. The third is treating the bookkeeping as something to catch up at year end rather than as a steady monthly routine.