Form 5472 for Swiss Residents With a US LLC

A Swiss resident who wholly owns a US single-member LLC generally files Form 5472 with a pro forma Form 1120 when the LLC has a reportable transaction with the owner or another related party. A Swiss individual normally uses the AHV insurance number as the FTIN; a Swiss entity normally uses its UID.

The form reports gross related-party transactions. It does not decide whether Switzerland recognizes the LLC as transparent, whether treaty relief applies, or whether US income tax is due.

When owner funding or withdrawals occurred, start the reviewed filing package before the deadline.

When must a Swiss-owned LLC file Form 5472?

A foreign-owned domestic disregarded entity generally files after any transaction with its foreign owner or another related party. Common triggers include formation funding, capital contributions, distributions, loans, reimbursements, and payments involving a related Swiss company.

The IRS Instructions for Form 5472 require a pro forma Form 1120 and state a current $25,000 penalty for a late, missing, or substantially incomplete form.

Swiss-US LLC event	Treatment
Owner deposits CHF-funded cash into the LLC	Reportable contribution
LLC transfers money to the owner	Reportable distribution
Owner pays the LLC’s registered-agent bill	Reportable owner-funded amount
Unrelated client pays an invoice	Not an owner transaction
LLC pays a Swiss company controlled by the owner	Related-party payment; separate-form analysis

The reporting is gross. A CHF-funded contribution and a later withdrawal remain separate even if the LLC ends the year owing nothing to the owner.

Which Swiss tax identifier goes on the form?

The Swiss Federal Tax Administration identifies the AHV insurance number as the TIN for resident individuals and the UID for resident entities. Use the identifier belonging to the party actually listed in Part II or Part III.

Owner type	FTIN entry	Other identifier handling
Swiss-resident individual	AHV insurance number	Add a consistent reference ID if no US identifying number exists
Swiss corporation or other entity	UID	Use the entity’s name, address, and identifier—not the controller’s AHV number
Owner with an existing ITIN or SSN	Enter it on 4b(1)	Continue to enter the FTIN consistently
Owner with no FTIN	Enter “None” or “N/A” when factually correct	Never invent an identifier

An individual does not need to obtain an ITIN solely for Form 5472. The ITIN guide explains when a separate US return can create an ITIN need.

Does the US-Switzerland treaty cancel Form 5472?

No. Switzerland appears on the IRS income-tax treaty index, but treaty provisions address income taxation, not the LLC’s related-party information return.

For services physically performed in Switzerland, US sourcing rules generally treat the service income as foreign-source. US workdays, an office, employees, inventory, or a dependent agent can change the analysis. A treaty position must also be properly claimed where required.

Swiss tax treatment remains a separate matter. A Swiss adviser should determine the LLC’s local classification, whether income belongs to the owner or entity, and what wealth-tax, value-added-tax, or foreign-entity reporting follows from the facts.

What is a reliable CHF-to-USD workpaper?

Use a repeatable six-field record for every related-party movement:

1. transaction date;
2. related party;
3. transaction type and direction;
4. original CHF amount;
5. exchange-rate source and rate; and
6. resulting USD amount with source evidence.

For example, do not convert only the owner’s year-end net balance. A contribution on one date and a distribution on another may use different reasonable rates and must remain separate in the Part V description. Our exchange-rate guide gives a fuller workpaper model.

How does a Swiss owner file the package?

1. Confirm the LLC is a one-owner disregarded entity. Different entity classifications require different returns.
2. Map the owner and every related party. Use the AHV number for the individual or UID for the Swiss entity as applicable.
3. Reconcile gross related-party movements. Do not mix client revenue with contributions, distributions, loans, or related-company charges.
4. Prepare the pro forma Form 1120 and Form 5472. Add the required supporting statement for Part V transactions.
5. Sign and file by fax or mail. The foreign-owned disregarded-entity package cannot be e-filed.
6. Retain the package and delivery evidence. Keep the exact signed pages, conversion workpaper, statements, and transmission record.

A calendar-year 2026 package is generally due April 15, 2027, or October 15, 2027 after a timely extension. Form5472 Prep prepares the filing, arranges accountant review, submits it to the IRS Ogden PIN Unit, and returns a timestamped receipt.

Frequently asked questions

What FTIN does a Swiss individual use?

A Swiss-resident individual normally uses the AHV insurance number as the FTIN. A Swiss company normally uses its UID instead.

Must a Swiss owner obtain an ITIN?

No, not solely for Form 5472. Use a consistent LLC-assigned reference ID when the owner lacks a US identifying number, and enter the applicable Swiss FTIN.

Does a Swiss client payment go on Form 5472?

Not merely because the payment is foreign. Ordinary unrelated-customer revenue is different from a transaction with the owner or another related party.

Does the tax treaty remove the filing obligation?

No. Treaty relief may affect US income tax on specific income, but it does not replace the Form 5472 disclosure required after reportable related-party transactions.

Can Form 5472 amounts be reported in Swiss francs?

No. The form reports US-dollar values. Preserve the original CHF amount and rate support in the workpaper, then report the consistently converted USD amount.

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A Swiss filing turns on accurate owner identification and a gross CHF-to-USD ledger. Start the reviewed Form 5472 package, or review how to fill out the form.