Bookkeeping for your US LLC: records, banking and annual close

7 years. Running your LLC's bookkeeping needs discipline, not noise. Tools, monthly structure, reconciliation, currencies and year-end close for non-residents.

The IRS requires you to keep an LLC's bookkeeping records for at least 7 years, and a Form 5472 with no books behind it starts at a 25,000-dollar penalty. At Exentax, sensitive steps sit in one controlled workflow, not in scattered notes.

Keeping the books for a US LLC scares people more than it should. Most non-resident owners come from a model where an accountant asks for paperwork, files quarterly returns and you barely touch anything. With a US LLC the model is different: day to day operations are run by you with modern tools, and at year end an orderly bookkeeping translates into a clean filing with no surprises.

At Exentax we walk hundreds of clients through this every year. This guide summarizes how to organize the bookkeeping of your LLC step by step, with a clear operating routine and without making it more complicated than it needs to be.

What bookkeeping is and why it matters

Bookkeeping is, simply, the orderly recording of every economic movement of your LLC: income, expenses, transfers between accounts, owner draws and ending balances. It is not the same as the tax return: the return uses the data from your bookkeeping, but bookkeeping lives all year long.

Clean bookkeeping gives you three things: compliance (Form 5472, 1120 pro forma and, in some states, additional reports), control (knowing how much you really earn after expenses) and a paper trail in case of a banking or tax review. All three matter, but the third one is usually discovered too late.

Starting point: separate finances

If this line gets crossed often, bookkeeping becomes impossible and, worse, the legal shield of the LLC is broken. It is the first norm and admits no exceptions.

What tools you need

For a small or medium non-resident LLC, this stack covers everything:

  • An approved operating account (Relay, Slash, or Mercury only where the profile fits) and a separate reserve layer for taxes, continuity and surplus treasury.
  • Wise Business for currencies other than US dollars, especially euros.
  • A spreadsheet in Google Sheets, Numbers or Excel; or, if you prefer software, Wave (free) or QuickBooks Online on its lighter plan.

You do not need to pay for QuickBooks Plus if your LLC bills under six figures and operates in a single dominant currency. A well-structured spreadsheet covers the use case.

Minimum structure of a clean bookkeeping

The sheet should have at least four tabs or sections:

  1. Income: date, client, description, original currency, amount, LLC currency (USD), exchange rate applied, supporting invoice.
  2. Expenses: date, vendor, category (software, travel, professional services, marketing, etc.), currency, amount, supporting receipt.
  3. Monthly close: opening balance, income, expenses, draws, closing balance, reconciliation against the bank statement.

Monthly bank reconciliation is the step most people skip and the one that prevents 90% of problems. If your sheet says you have USD 12,450 and Mercury says USD 12,380, there are USD 70 unexplained. Finding that gap today takes five minutes; finding it next April takes two evenings.

Expense categories worth keeping from day one

Stable categories help with the close and, above all, with your filing. The most useful for service and digital LLC:

  • Software and SaaS subscriptions.
  • Payment gateway fees (Stripe, PayPal, compatible processors, DoDo).
  • Banking and FX fees.
  • Marketing and advertising.
  • Professional services (accounting, lawyers, registered agent).
  • Business-related travel.
  • Equipment (computer, business phone).
  • Coworking and office.
  • Professional education.
  • Owner draw (kept separate from the rest).

For more detail on what is deductible and what is not, see our guide on <a href="/en/blog/llc-deductions-with-proof-and-tax-judgment">deductible LLC expenses</a>.

Monthly close step by step

The monthly close takes 30 to 90 minutes depending on volume. The ideal routine:

  1. Download the month's statements from Mercury, Wise and any other account.
  2. Dump movements into your sheet, marking income, expenses and internal movements.
  3. Attach the supporting document for each movement in a folder for that month (Google Drive with sub-folders by month works well).
  4. Reconcile: the closing balance on your sheet must match, to the cent, the closing balance on the statement.
  5. Save a PDF of the closed month. That folder is your backup if Mercury, the <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> or your home tax authority ever asks for information.

Currencies: the detail that creates most errors

If you bill in euros and run the LLC in USD, every time you receive a payment you must record two things: the original amount and the converted amount in USD at the day's exchange rate. The IRS accepts the daily rate or a reasonable annual average; the important thing is to be consistent and document the source (Wise, Mercury or the central bank rate).

Do not mix currencies in the same column. If "USD Amount" is your main column, convert at the moment of recording; do not leave it for later.

Year-end close and handover to the accountant

On December 31 you do an extended close: in addition to the monthly close, you generate an annual summary with category totals, gross income, gross expenses, net profit and total owner draws. That summary is what you hand to your accountant to prepare the pro forma Form 1120 and the mandatory <a href="/en/blog/form-5472-for-foreign-owned-llc">Form 5472</a> for non-resident LLC.

At Exentax we ask our clients for this package before the end of February: full-year statements, sheet with reconciled monthly closes, supporting receipts folder and an annual summary by category. With this we can prepare the return without bothering you for weeks.

Four habits that break monthly reconciliation

  • Mixing personal and LLC expenses. The most common and the most expensive: it breaks the shield and forces you to retrace every movement.
  • Not reconciling monthly. Stacking reconciliations turns a one-hour task into a multi-day job.
  • Forgetting FX fees. When Wise converts EUR 1,000 to USD, there is a small fee that is also a deductible expense. Not recording it means losing money.
  • Not keeping issued invoices. Any bank or gateway can ask you for the origin of a large inbound payment. Without the original invoice, explanations become uphill work.
  • Waiting until March to start. A guaranteed recipe for late filings or rough numbers handed to the accountant.

Managed bookkeeping and monthly reconciliation

For clients who prefer to delegate, at Exentax we offer managed monthly bookkeeping: we pull statements from Mercury and Wise via a secure connection, categorize movements, reconcile balances and deliver a clear monthly report. You only need to keep finances separate and forward us invoices for expenses not visible in the statement (subscriptions, paper receipts, etc.).

It is the calmest way to operate an LLC: when next April arrives, the return is half done because the bookkeeping is closed month by month.

Real scenarios where Bookkeeping for your US LLC step by step: keep it simple and clean applies

Case 1: freelancer billing 60,000 USD/year to 4 European clients.

Needs weekly reconciliation routine, free software (Wave) and simple Form 5472 template. Estimated time: 30 minutes per week. No external advisory required.

Case 2: digital agency with 3 partners and 15 recurring clients.

Requires Xero or QuickBooks Online, custom categories per project, fortnightly reconciliation and external bookkeeper from the start. Monthly cost: 250-400 USD between software and services.

Case 3: ecommerce with Stripe, Shopify and Asian suppliers.

Multi-currency and multi-gateway complexity demands A2X or Synder to automate imports. Ecommerce-specialized bookkeeper indispensable. High initial investment but avoids errors that cost thousands in corrections.

FAQ on Bookkeeping for your US LLC step by step

Do I need accounting software if my LLC invoices little?

Yes. Even at low volume, manual spreadsheet bookkeeping increases the risk of Form 5472 errors and makes it harder to justify expenses to the IRS in an audit. Wave (free) or Xero at 15 USD/month solve the case. In an Exentax file, the source record comes first and the response follows from it.

How do I categorize crypto payments?

Every crypto payment in or out must be recorded at its USD value on the operation date. Use a reliable exchange-rate source (CoinGecko, Coinbase). If the crypto is held, variations are not income until conversion.

Do I have to keep paper invoices?

No. The IRS accepts digital copies. What matters is that they are legible, complete and properly archived. A monthly folder on Google Drive or Dropbox is enough for a small LLC.

Can I deduct expenses paid with my personal card before opening the LLC bank account?

Yes. During the first months it is common. Record them as owner-reimbursable and book a single transfer from the LLC account once it is live. Keep the original invoice and the personal payment evidence.

When does it make sense to hire an external bookkeeper?

When your volume exceeds 50 monthly transactions or your activity gets complex (multiple currencies, ecommerce, subscriptions). Below that threshold, weekly internal discipline is perfectly viable.

Practical close on Bookkeeping for your US LLC step by step

LLC bookkeeping is not complicated, but it requires routine. Separate finances from day one, pick a simple tool, reconcile every month and keep your receipts. With that discipline, your LLC runs for years without surprises and the annual filing stops being a stressful event.

If you prefer not to handle it yourself, Exentax can run the bookkeeping of your LLC alongside the tax calendar, annual filing file and operating documentation. <a href="/en/book">Book a strategic review</a> if your records are already scattered and you need a clean monthly rhythm before year-end.

For bookkeeping, the strongest tax position is built entry by entry: income source, invoice, payment method, expense category, related-party movement and owner distribution. Clean books turn a structure from an argument into evidence.

> <a href="/en/book">Review my case</a>

FinCEN and IRS 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. At Exentax we map the exposure early, prepare the reasonable-cause file and reduce avoidable escalation before the authority controls the timeline.