Opening an IBKR account for your US LLC - documents, costs, and the market-data catch

The standard pitch for trading through an LLC leans on taxes, and that is the wrong reason. For a non-resident, the US tax outcome of a single-member LLC brokerage account is the same as a personal one: the trading safe harbor already keeps capital gains out of US tax, dividends still lose the default 30% withholding, and home-country tax follows the owner either way. The full argument is in a US LLC for non-resident traders; this piece assumes the structure already makes sense for you and covers the part nobody writes down: actually opening the brokerage account.

The realistic frame: an entity account buys separation and continuity, and it costs paperwork upfront plus one recurring fee most guides skip entirely, professional market data. Here is the route on Interactive Brokers, which is the standard venue for non-residents (/stack/ibkr) and takes entity accounts for foreign-owned LLCs.

Why put the brokerage account in the entity at all

Three operational reasons survive contact with reality. Separation: the trading book lives in the entity, with its own statements, its own capital, and a clean wall against personal spending; if you also invoice consulting or content through the LLC, everything sits in one perimeter. Continuity: when the owner moves country, a personal account gets re-papered around the new residency; the entity account belongs to a Wyoming LLC whose address did not move. Banking rails: the same LLC that holds the brokerage account holds US business banking, so funding flows stay inside one entity's name, which brokers and banks both prefer.

What does not belong on the list is tax. A foreign-owned single-member LLC is disregarded for US tax purposes, so withholding and reporting follow the owner as if the LLC were not there. Anyone selling the entity account as a tax upgrade is selling the part that does not exist.

What IBKR asks for

The entity application is longer than the personal one but runs fully online. Expect to provide:

1. The formation document. For a Wyoming LLC, the Articles of Organization as filed with the Secretary of State.
2. The operating agreement. This is where a single-member LLC proves who owns it and who is authorized to trade. If your formation service did not draft one, you need one before this step, not after.
3. The EIN. The LLC's federal tax identification number. Entity accounts are identified by it, so it is a prerequisite, not an afterthought. The IRS issues it free; a non-resident owner without a US tax number files Form SS-4 by fax or mail and waits a few weeks. Formation packages usually bundle it.
4. KYC on the humans. Identity documents for the beneficial owners (the standard threshold is 25% ownership) and for the person who will actually operate the account. For a single-member LLC that is the same person wearing two hats, and the application says so explicitly.
5. Tax certification. The application walks through the W-8 logic itself. For a disregarded single-member LLC, the certification effectively lands on the owner, which is why the withholding outcome matches a personal account.

None of this requires a US visit, a US visa, or a US address beyond the LLC's own registered agent address.

The cost the pitch skips: professional market data

The US exchanges price real-time data in two tiers, and the cheap tier is defined as natural persons only. An account in the name of a legal entity is generally classified as professional, and professional rates run an order of magnitude higher, per exchange feed. On a personal account, live US equity data costs a few dollars a month; the professional equivalents are set per venue and add up quickly across NYSE, Nasdaq, and the options feed.

This is the one recurring cost that genuinely differs between the personal and entity routes, so treat it as a line item, not a surprise. The standard mitigations: run delayed data on everything you do not actively execute, subscribe the live feed only for the venue you trade, and remember the commissions and margin rates themselves do not change; the entity account trades the same products at the same pricing as a personal one.

Funding, and the trap of moving existing positions

IBKR restricts third-party funding: money in must come from an account in the LLC's own name. In practice that means the LLC's US business bank account funds the brokerage account, which is one more reason the banking setup precedes the brokerage setup. A wire from your personal account into the entity's brokerage account is exactly the mixing the structure exists to prevent, and the broker will bounce it.

The sharper trap is existing positions. A broker transfer moves accounts with identical titleholders; you-the-person and your LLC are not identical titleholders. Moving personal positions into the entity is a change of ownership, and your country of residence may treat it as a taxable disposal at market value. Some owners sell, move cash, and rebuy inside the entity; some contribute positions formally; the right answer depends on local tax law, so price it with an adviser before assuming the move is free.

What does not change

Worth stating plainly, because the sales pages will not. US taxes: unchanged, per the safe harbor and the disregarded-entity treatment above. The pattern day trader rule: applies at the account level to margin accounts under $25,000 of equity, entity or not. Margin and product access: same as a personal account with the same permissions. Home-country taxes: entirely unchanged; the entity is invisible to nothing except your own bookkeeping, and most tax residencies look straight through it.

The order of operations, end to end

The sequence that avoids re-doing steps: form the LLC and get the operating agreement drafted at formation; obtain the EIN; open the US business bank account in the LLC's name; then open the IBKR entity account and fund it from the LLC's bank account. Done in that order, each step feeds the next one's paperwork.

Disclosure, so the incentive is on the table: QuantAbundancia and expat-llc are two brands of the same company, Abundancia Capital LLC, which is itself a Wyoming LLC running exactly this stack. expat-llc handles the formation, EIN, and compliance calendar as a paid service, and its revenue funds this research. The brokerage side is yours to open, and /stack/ibkr is the referral route the desk itself uses.