How to run your LLC day to day: 45-60 min/month vs 8-10 h

2 to 5 hours of admin a month. A well-run LLC takes 45-60 minutes a month; a badly run one eats 8-10 hours. At 90 USD/hour billable that is 7,200-10,800 USD/year wasted. The practical guide.

Running a well-kept LLC takes 2 to 5 hours of admin a month: uploading invoices to a drive, reconciling Mercury, and filing Form 1120 + 5472 once a year.

Once your LLC is formed and your bank account is open, what does daily operation look like? Here's a practical guide to the day-to-day.

Your financial hub: Mercury

Mercury is where your financial life as an LLC owner centers. Everything flows through here:

Receiving payments:

Share your Mercury routing number and account number with clients for ACH or wire transfers
Connect Stripe to your Mercury account for card payments
Link PayPal Business to Mercury for PayPal deposits
Use Relay payment links (powered by Adyen) for quick client invoicing

Making payments:

Pay for business tools and subscriptions directly from Mercury
Send wire transfers to international contractors ($0 fee, domestic and international)
Use your Mercury debit card for business expenses
Use Wallester virtual cards for individual subscriptions. one card per service for granular tracking

Managing treasury:

Keep operating cash in Mercury checking account
Move reserves to Mercury savings for yield
Use Slash for corporate treasury. idle cash generates yield while you decide when to distribute

Monitoring your business:

Mercury's dashboard shows real-time balance, recent transactions, and analytics
Download statements monthly for your records
Set up alerts for important transactions
Use the Mercury mobile app for on-the-go monitoring

Invoicing your clients

As a US LLC, your invoices should include:

Your LLC's legal name (e.g, "Smith Digital LLC")
Your registered agent's address (your US address)
Your EIN
Invoice number and date
Description of services
Payment terms (Net 30, upon delivery, etc.)
Payment instructions (Mercury routing + account for wire/ACH, or Stripe payment link)

The invoice goes out without VAT: US LLCs don't charge European VAT on international business services. Your clients handle reverse charge in their own countries.

The complete financial toolkit

Mercury: your primary financial platform

Mercury is where your LLC's money lives. Backed by Column NA (federally licensed bank, FDIC insured to $250,000). What makes it special:

$0 fees on everything: maintenance, ACH, domestic and international wires
Debit card (physical and virtual) for LLC expenses
Sub-accounts to organize your money (operating, taxes, reserve)
Clean dashboard with automatic transaction categorization
Built-in invoicing: you can send invoices directly from Mercury

Key detail: Mercury charges $0 for international wires, both sending and receiving. This is a massive advantage over any traditional bank.

Wise Business: your currency conversion tool

Wise (note: it's an EMI. Electronic Money Institution, not a bank) is perfect for converting dollars to euros, pesos, or any other currency. It gives you the real exchange rate (mid-market rate) with no hidden markup.

Typical flow: Client pays → Mercury (USD) → Wise (conversion) → Your personal account (EUR/MXN/COP).

Slash: yield on idle capital

Capital that accumulates in Mercury between collections and distributions can work for you. Slash acts as a corporate treasury manager, generating yield on your LLC's idle liquidity. This matters when your LLC bills regularly but you distribute profits monthly or quarterly, that time gap is money that can be optimized.

Wallester: corporate cards for daily expenses

For your LLC's operating expenses (subscriptions, tools, services), Wallester gives you virtual and physical corporate cards with individual limits and granular control. Every expense is automatically recorded and categorized. Much more professional than using the Mercury debit card for everything, and it reinforces financial separation.

Revolut Business: multi-currency complement

If you operate in multiple currencies. billing in USD, paying suppliers in EUR, with expenses in GBP. Revolut Business (EMI) gives you multi-currency accounts with competitive exchange rates on weekdays and team cards. Complements Mercury and Wise.

Stripe, PayPal, and more: collecting from clients

Stripe for card payments, subscriptions, and professional checkout (2.9% + $0.30)
PayPal Business for clients who prefer that method
Adyen for enterprise processing (also powers Relay payment links)
DoDo Payments if you sell B2C digital products. acts as Merchant of Record and handles VAT/GST for each country automatically

All connect to your Mercury account seamlessly.

Expense tracking

Track every business expense throughout the year. Your LLC can pay any expense that is ordinary and necessary for the business:

Software and tools (hosting, domains, SaaS, licenses)
Professional services (accounting, legal, marketing, design)
Advertising and digital marketing
Hardware for work (computer, monitor, keyboard, ergonomic chair)
Professional development (courses, conferences, technical books)
Coworking or workspace
Business travel (when directly related to your activity)
Bank and payment processor fees
Exentax fees (yes, our fees are deductible)

Deductible expenses reduce your taxable base, and since your profits "pass through" the LLC (pass-through taxation) to your personal tax return, every legitimate expense you deduct is money you don't pay tax on. But every expense must be documented and genuinely business-related. Don't try to pass Saturday dinner with friends as a "networking dinner."

Use simple spreadsheets, Wave (free), or QuickBooks to track expenses. This makes Form 5472 preparation much easier.

Handling payments in different currencies

If clients pay in euros, pounds, or other currencies:

Have non-USD clients pay to your Wise Business account in their currency
Convert at the real mid-market rate (0.4-1.5% fee vs. 2-4% at traditional banks)
Transfer USD to Mercury via free ACH
Keep records of the USD amounts for each transaction

Recommended flow: Client pays (EUR/GBP) → Wise (convert to USD) → Mercury (store) → Your personal account (Owner's Draw)

Collecting payments: your options

You have several options (and should use the most appropriate one for each client):

ACH: for US clients. Free on Mercury and the most common method in the US
Wire transfer: for large or urgent payments. $0 on Mercury (yes, both sending and receiving)
Stripe: for card payments, subscriptions, or online payments (2.9% + $0.30 per transaction)
PayPal Business: widely accepted alternative
Wise Business: ideal for receiving in multiple currencies (EUR, GBP, etc.) and converting to USD
Relay payment links: powered by Adyen, for quick client invoicing

The golden rule: all business money enters through the LLC account. If a client asks "can I pay to your personal account?" the answer is always no.

Owner's draws: paying yourself

As a Single-Member LLC, the profits are yours. You can transfer money whenever you want. This is called an Owner's Draw.

It's not a salary. you don't need to run payroll. You simply make a transfer from the LLC account to your personal account. What matters:

Document each withdrawal with a clear note ("Owner's Draw - [date] - [amount]")
Don't withdraw more than what's available (sounds obvious, but it happens)
Maintain a cushion in the account for operating expenses and compliance costs
Consolidate your withdrawals: better one documented monthly withdrawal than 47 small transfers

Pro tip: Set a monthly "payday." The first of each month, for example, make an Owner's Draw for the amount you've decided. This simplifies accounting and creates clean habits.

Record keeping: your future self will thank you

You don't need complex accounting (you're not a multinational), but you need order:

Income and expense records: Mercury does this automatically with its dashboard, but maintain your own tracking spreadsheet too
Save all invoices issued and received. create a Google Drive folder organized by month
Save expense receipts: digital or photos of physical ones. No receipt = no deduction
Record Owner's Draws: date, amount, transfer method
Export bank statements from Mercury quarterly. save them in your LLC folder

These records are essential for your tax filings (Form 5472 + 1120) and for demonstrating that your LLC operates as a real business.

Monthly financial routine

Dedicate 30 minutes per month to this routine:

Review your Mercury statement. Does everything check out?
Categorize expenses that weren't automatically categorized
Save pending invoices and receipts in your folder
Make your monthly Owner's Draw (if applicable)
Check your balance: do you have enough cushion for next month?
Review Wallester card charges for accuracy
Reconcile Stripe payouts with Mercury deposits

30 minutes. Once a month. That's all you need to keep your LLC running smoothly.

Quarterly:

Review overall financial health
Plan upcoming distributions
Review any currency conversion needs
Estimate tax obligations in your country of residence

Annually:

Provide all transaction records to Exentax for Form 5472 preparation
File BOI Report updates if anything changed
Renew registered agent (handled by Exentax)
Year-end fiscal review and next-year planning

Common daily operation mistakes

Mixing personal and business accounts: the most serious and most frequent error. Repeat: NEVER
Not saving receipts: without documentation, you can't deduct the expense and you lose money
Using the Mercury card for personal expenses: compromises entity separation
Not recording Owner's Draws: creates problems for annual filing
Forgetting annual maintenance: Annual Report, Form 5472+1120, Registered Agent renewal
Not having a routine: laziness compounds, and by year-end you have accounting chaos
Asking clients to pay to your personal account: every payment must go to the LLC account

What Exentax handles for you

You focus on running your business. We handle:

Annual Form 5472 + Form 1120 filing
Automatic Form 7004 extension filing
BOI Report maintenance and updates
Registered Agent renewal
Compliance monitoring
Questions via WhatsApp and email throughout the year

The difference between an LLC that works and one that causes problems isn't in the paperwork. it's in the daily operation. At Exentax, we configure your complete operation from day one. We don't disappear after formation. We make sure Mercury is approved, Stripe is connected, and your collection and distribution flow works without friction.

Operating Agreement deep dive

The Operating Agreement is the single most important LLC document after the Articles of Organization. Here's what yours should contain:

Essential provisions:

Single-member LLC designation
Foreign (non-US) owner identification
Disregarded Entity tax classification
Manager-managed structure (you as managing member)
Distribution policy (Owner's Draw method)
Fiscal year designation (calendar year)
Registered Agent appointment
Authority to open bank accounts

Why this matters for banking: Mercury, Relay, Wise, and Stripe all review your Operating Agreement during onboarding. A properly drafted Operating Agreement that includes all these provisions speeds up your account approvals significantly.

Common mistakes: Using a template from LegalZoom or another formation service that doesn't account for non-resident ownership. These generic templates often lack the foreign owner provisions that Mercury requires, leading to application rejection.

The complete document checklist

At Exentax, every document is prepared, filed, and organized for you. You receive a complete LLC documentation package upon formation and annual updates as filings are completed.

If something in this structure left you wanting more detail, Your first month with a US LLC: what to expect week by week dives into a neighbouring piece of the puzzle we usually keep for a separate write-up.

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). 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.
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.

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.

> Free consultation, no strings attached

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:

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.

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. Relax: at Exentax this is what we do every week, we close it before the letter ever lands in your inbox.

Balanced banking stack: Mercury, Relay, Slash and Wise

Read this section as a checklist with teeth: each point flags a real failure mode we have seen in cross-border LLC files. Skip none of them - most reassessments and account closures we clean up later trace back to one of these items.

The seven operating habits that keep an LLC healthy

Running an LLC well is about habits, not accounting talent. The LLCs that reach Exentax with problems almost always violated at least three of these seven. Sticking to them turns the LLC into an asset managed in under two hours a month.

A single operating account. Every inflow and outflow runs through Mercury (or equivalent). If you need to pay a personal expense with LLC money, first transfer it to Wise personal as a member draw and pay from there. Mixing operations is the root of every later complication.
Anchored tax calendar. 5472 + 1120 pro forma by April 15 (extension to October 15 via Form 7004); state annual report on its due month; BOI report within 30 days of any change. These three points in your calendar with two weeks' lead time.
Monthly reconciliation. On the 5th of each month, reconcile the prior month's statement against the books. Recurring calendar mark. Without this, bookkeeping piles up and April becomes painful.
Document per transaction. Every inflow has an issued invoice (numbered). Every expense has a received invoice (PDF in the month folder). Every cross-account movement has a note. This documentary layer sustains any later request.
Backup account. Mercury primary + Wise Business or Relay as active backup, with at least one monthly transaction to keep the history. A single account is a single point of operational failure.
Target balance and reserves. Keep at least 3 months of fixed expenses in the operating account. Surplus moves to Wise multi-currency or personal investment account on a defined policy. Without policy, money stays idle or is spent without thought.
Honest quarterly review. Every 90 days, 30 minutes to review P&L, margin ratio, client concentration and year-end tax forecast. Catch drift early, while it can still be corrected.

What we are asked the most

How much monthly time does a well-run LLC take? Between 90 minutes and 3 hours a month for an LLC with 5-30 monthly transactions. Year-end (5472, final reconciliation, BOI if changes) adds 4-8 hours in April.

Can I fully outsource operations and disconnect? Not entirely. Monthly bookkeeping reconciliation, invoice issuance and member-draw decisions cannot be delegated without risk. What we do take over at Exentax is the year-end close, the tax calendar and the response to inquiries.

At Exentax we leave the client with an LLC operating manual fit to their flow, synced calendars and a fixed contact for the questions that come up across the year.

Legal and procedural facts

On the same topic

What if HMRC, the IRS or my local tax authority asks about my LLC?

It's the question every client raises in the first consultation, and the short answer is: your LLC isn't opaque, and a properly declared structure closes any inquiry in standard forms. Your tax authority can request the state Certificate of Formation (Wyoming, Delaware or New Mexico), the EIN issued by the IRS, the signed Operating Agreement, the Mercury or Wise statements for the year, the Form 5472 plus pro-forma 1120 you filed, and the bookkeeping that reconciles income, expenses and movements. If all of that exists and is delivered in order, the inquiry doesn't escalate.

What tax authorities do pursue, and rightly, is sham ownership (nominees, paper residency) and undeclared foreign accounts. A well-structured LLC is the opposite: you appear as beneficial owner in the BOI Report when applicable (verifiable at fincen.gov/boi), you sign the bank accounts and you declare the income where you actually live. The structure is registered with the state Secretary of State, with the IRS and, when European banks are involved, inside the CRS perimeter of the OECD standard.

The mistake that really sinks an inquiry isn't having an LLC; it's not attributing the income correctly in your domestic return, not declaring foreign accounts when the year-end balance exceeds the local threshold (€50,000 in Spain via Modelo 720; the equivalent FBAR / Form 8938 in the US for residents; T1135 in Canada), and not documenting related-party transactions between the member and the LLC. Those three fronts are worth closing before any request arrives, not after.

## What an LLC does NOT do

- It does not exempt you from tax in your country of residence. If you live in Spain, France, Germany or Portugal, you are taxed there on worldwide income. The LLC organises your US side (zero federal tax for non-resident SMLLC pass-through, absent Effectively Connected Income); it does not switch off your domestic taxation. The income tax is computed on the attributed profit, not on the dividends actually paid.

- It is not an offshore vehicle or a BEPS scheme. It is a US entity recognised by the IRS, registered in a specific state with physical address, registered agent and annual informational filings. Classic offshore jurisdictions (BVI, Belize, Seychelles) leave no public trace; an LLC leaves a trace in five different places.

- It does not protect you if you commingle funds. The pierce the corporate veil doctrine kicks in as soon as a judge sees the LLC and the member behaving as the same wallet: mixed accounts, personal expenses paid from the LLC, no signed Operating Agreement, no bookkeeping. Three suspicious transactions are enough.

- It does not save you social security contributions at home. If you are self-employed in Spain, France or Germany, your monthly social contribution remains identical. The LLC handles the trading side with international clients; your personal contribution is independent.

- It does not exempt you from declaring foreign accounts. Spain residents file Modelo 720 / 721; UK residents, the SA106; Portugal residents, the Anexo J of Modelo 3 IRS; Germany residents, the Anlage AUS. Those obligations belong to the individual, not to the LLC.

At Exentax we cover those five fronts every year alongside the US federal calendar (Form 5472, pro-forma 1120, FBAR, state Annual Report and BOI Report when applicable). The goal is that no inquiry finds a loose end and that the structure withstands a 5-to-7-year retroactive review.

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

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