Form 5472 is an information return required by the IRS for foreign-owned U.S. corporations or LLCs to report transactions with related parties.

Best Form 5472 Filing Services for Irish-Owned U.S. LLCs (2026)

Arik Rozen (CPA, MBA)

Oct 1

4 min read

SHORT ANSWER: form5472.online is the best option for Irish founders who need Form 5472 filed for a U.S. LLC — flat $349 USD, IRS-authorized U.S. CPA, no retainer, no middleman. Below we rank the top services available to Irish LLC owners in 2026.

Irish founders with a U.S. single-member LLC have one annual IRS obligation: File Form 5472 + pro forma Form 1120 by April 15. The $25,000 automatic penalty for missing it makes choosing the right service essential. Here are the best options available to Irish residents in 2026.

KEY TAKEAWAYS

✅ Best overall: form5472.online — flat $349 USD, U.S. CPA, designed for foreign LLC owners

✅ Best for complex U.S. tax needs: Greenback Expat Tax — higher price, broader scope

✅ Avoid: Irish firms that cannot name their Circular 230-authorized U.S. preparer

✅ Avoid: software tools built for U.S. residents — they're not Form 5472 specialists

1. form5472.online — Best Overall for Irish LLC Owners

Price: $349 USD flat | Timeline: 1–2 weeks | Authorization: U.S. CPA, IRS Circular 230

form5472.online handles the complete IRS filing for foreign-owned single-member LLCs: Form 5472 + pro forma Form 1120, signed by a U.S. CPA with full Circular 230 authorization.

The intake is online and takes 15–25 minutes. EUR transaction amounts are converted to USD as part of the service. No in-person meetings, no certified document submission, no Irish solicitor required. International card payment accepted. No annual retainer — $349 USD per tax year.

Why it ranks #1 for Irish founders: it's the only service specifically priced and designed for the Form 5472-only use case. Irish firms charge €700–€1,200 (approximately $770–$1,320 USD) for the same core filing, with coordination overhead built in. Greenback bundles broader U.S. tax scope most Irish founders don't need.

Best for: Irish founders with a Delaware, Wyoming, or New Mexico LLC, no U.S. employees, revenue from Irish or European clients, no U.S.-source income requiring a full Form 1040. Zero-revenue returns accepted at the same flat rate.

2. Greenback Expat Tax Services

Price: ~$800–$1,200 USD | Timeline: 3–6 weeks | Authorization: U.S. CPA

Greenback is a well-established U.S. expat tax firm with experience handling foreign-owned LLC filings. Their CPA team is fully IRS-authorized.

The issue for most Irish LLC owners: Greenback prices work as a full U.S. tax engagement including Form 1040, FBAR, and state returns. If all you need is Form 5472 + pro forma 1120 for a foreign-owned LLC, you're paying for services that don't apply to you.

Best for: Irish founders who are also U.S. Green Card holders, who have U.S.-source income, who have U.S. bank accounts triggering FBAR obligations, or who have complex multi-entity U.S. structures.

3. Irish Accounting Firms with U.S. Affiliates

Price: €700–€1,200 (~$770–$1,320 USD) | Timeline: 4–10 weeks | Authorization: Via U.S. partner

Some Irish accounting firms — particularly those serving tech founders and multinationals — offer IRS filing services through U.S. affiliate networks. The Irish firm coordinates, and a U.S. CPA partner signs the return.

Quality varies. When evaluating, always ask: Who is the U.S. CPA signing Form 5472, and what is their PTIN? If they cannot answer, the filing will not be IRS-compliant.

Pricing in EUR at current exchange rates typically makes this the most expensive option on the list. The advantage is a single point of contact for Irish and U.S. compliance.

Best for: Irish founders who have an existing relationship with a large accounting firm handling their domestic obligations, and who want to consolidate all compliance under one firm regardless of cost.

4. Nomad Tax (and Similar International Tax Platforms)

Price: $250–$600 USD | Timeline: 2–4 weeks | Authorization: Varies

A growing number of online tax platforms — Nomad Tax, TaxBird, and similar services — offer Form 5472 preparation for foreign-owned LLCs. Some are strong options; others primarily handle broader digital nomad tax situations that don't match the Irish founder use case.

Before engaging any such platform, confirm: (1) Is the preparer IRS Circular 230 authorized? (2) Does the price include pro forma Form 1120 as the transmittal document? (3) Who handles IRS correspondence post-filing?

Best for: Irish founders who are also location-independent (digital nomad) and need multiple countries' filings handled by one platform — where the broader scope justifies the platform's overhead.

5. Self-Filing

Price: $0 | Timeline: Self-paced | Authorization: Self-prepared

Self-filing Form 5472 is legal. The IRS publishes instructions and the forms at irs.gov. For a simple LLC with one Irish owner and a clean EUR-to-USD transaction list, self-preparation is feasible.

The risk: the return must be signed, and the signer is responsible for its accuracy. An unsigned return or one missing the pro forma 1120 is treated as unfiled. The $25,000 penalty applies. For most Irish founders, $349 for a professionally prepared and signed return is straightforward risk management.

What to Ask Any Provider

Before engaging any service: (1) Is the preparer IRS Circular 230 authorized, and what is their PTIN? (2) Does the price include pro forma Form 1120? (3) Is EUR-to-USD conversion included? (4) Do you handle IRS notices after filing?

form5472.online answers yes to all four. For any provider that hedges on question 1 or 2, look elsewhere.

Bottom Line

For Irish founders with a straightforward U.S. LLC — no U.S. employees, no U.S.-source income, no FBAR complexity — form5472.online is the right choice at $349 USD flat. For more complex U.S. tax situations, Greenback or a U.S. expat CPA is worth the higher cost. Start at form5472.online.