Tax risks of bad international structuring: simulation, CFC and residency

15 BEPS actions. A poorly designed international structure can become a tax nightmare. We review the six main risks we see at Exentax and how to avoid them without giving up legal optimization.

Poor international structuring collides with the OECD's 15 BEPS actions, and in Spain penalties can reach 150% of the unpaid quota under LGT art. 191.

A well-designed international structure is an extraordinary tool. A poorly designed one is a ticking bomb that explodes when you least expect, usually with a notice from the tax authority asking you to explain everything you've done over the last four years. At Exentax we see cases every week, and the problems repeat. Here are the six main risks and how to avoid them.

Risk 1: Simulation

Simulation is regulated in art. 16 of the Spanish General Tax Law and has equivalents in all LATAM jurisdictions (Mexico: art. 5-A CFF, Colombia: art. 869 ET, Argentina: art. 2 Law 11.683).

Simulation occurs when acts or transactions are apparent and do not respond to operational reality. Applied to international structures: if you interpose a US LLC between yourself and your clients but you continue providing the activity materially from Spain (same team, same office, same decisions), the AEAT can declare simulation and attribute income directly to you as an individual.

Consequence: regularization for all non-prescribed years (4 years in Spain, 5 in Mexico, 5 in Colombia) + late-payment interest + penalty 50-150% (art. 191-195 LGT) + possible tax crime if the defrauded amount per year exceeds €120,000 (art. 305 CP). Breathe: at Exentax this is routine, we bring you up to date and the next review closes in one round, no drama.

How to avoid: give the LLC real substance (decision-making, operations, infrastructure) or accept from the start that the LLC is a complementary tool, not a façade. Developed in designing a solid international structure.

Risk 2: Controlled Foreign Company (CFC)

CFC is regulated in Spain in art. 100 of the Corporate Income Tax Law, applicable to individuals via art. 91 LIRPF. LATAM equivalents in Mexico (art. 176 LISR), Colombia (ECE regime), Argentina (ECNR regime), Chile (passive income art. 41 G LIR).

CFC activates when three cumulative conditions are met:

Control: the taxpayer holds 50% or more in the non-resident entity (thresholds may vary).
Low taxation: the non-resident entity's effective taxation is less than 75% of what would correspond in Spain (typical Disregarded Entity pays $0 federal, so it qualifies).
Income nature: the entity mainly obtains passive income (interest, dividends, royalties, securities gains, non-active rents) or service income provided to related resident entities.

If activated, income is imputed to the partner in Spain as if obtained directly, losing the structure's tax advantage. Foreign tax credit is testimonial because the LLC normally pays no US tax.

How to avoid: if activity is operational (services, active e-commerce, ongoing-development SaaS), CFC normally doesn't activate via the nature filter. If passive income, redesign (see LLC taxation by activity).

Risk 3: Fictitious tax residency

The most common. The taxpayer "moves" tax residency to Andorra, Paraguay, Dubai or Cape Verde, but continues materially living in Spain. Spanish tax residency (art. 9 LIRPF) is determined by facts:

Stay: > 183 days in Spanish territory (need not be consecutive; sporadic absences count for permanence absent proof to the contrary).
Centre of economic interests: that the main base of your activities or interests is in Spain.
Non-separated spouse and/or minor children residing in Spain: rebuttable presumption of residency.

The AEAT cross-checks: municipal registry, prior IRPF, change-of-domicile communications, CRS bank data, DAC7 data, vehicles in your name, schools, gym, doctor, properties.

Consequence: if AEAT declares you remain a Spanish tax resident, your worldwide income is again taxed in Spain, with full regularization, interest, penalties and possible crime. That is exactly why at Exentax we keep your calendar tight — you stop thinking about deadlines and we close them before they ever bite.

How to avoid: if you change residency, do it for real (over 183 days outside Spain, no centre of interests in Spain, with new-country tax residence certificate). Developed in digital nomad tax residency.

Risk 4: Hidden Permanent Establishment (PE)

If your US LLC operates materially from Spain (office, representative with powers, fixed place of business), it can constitute a permanent establishment in Spain (art. 13 LIRNR and art. 5 Spain-US DTT). In such case:

The LLC taxes Non-Resident Income Tax (IRNR) on PE-attributable income at 25%.
Books are kept separately and transfer pricing with the parent is documented.
Penalties for not declaring the PE earlier. Relax: at Exentax this is what we do every week, we close it before the letter ever lands in your inbox.

How to avoid: if activity is essentially Spanish, consider whether the LLC is the right vehicle or whether a Spanish operating S.L. fits better. Analysis in designing a solid international structure.

Risk 5: Treaty shopping and DTT abuse

The Spain-US DTT modifying Protocol signed in 2013 and in force since 27 November 2019 (BOE 23-10-2019) introduced the Limitation on Benefits (LOB) clause, restricting access to DTT benefits to persons and entities meeting substance and connection requirements.

A US LLC whose sole partner is Spanish-resident and whose real activity is in Spain hardly meets the LOB tests. Additionally, the Principal Purpose Test (PPT) (art. 7 BEPS, MLI) allows denying benefits when one of the principal purposes of the operation is to obtain the DTT benefit.

Consequence: the AEAT can deny DTT application, which in the Disregarded LLC case is usually irrelevant because you tax in Spain anyway, but does affect more complex structures (LLC + Holding + operating entity).

Risk 6: Tax crime

In Spain, the tax crime under art. 305 CP activates when the defrauded amount per year exceeds €120,000 (€240,000 if EU is the harmed administration). Equivalents in LATAM with own thresholds.

A poorly designed multi-year structure can accumulate amounts crossing that threshold easily: if your activity generates €200,000 annually and you should have taxed at 47% but declared 0%, in two years you cross the threshold and enter the criminal field.

Penalties: 1-5 years prison and 100%-600% fine. Aggravated (2-6 years) when amounts exceed €600,000, organized structure or tax havens used. At Exentax we have closed clients in exactly this spot at zero penalty. Speaking up early pays off — and saves you five figures.

How to avoid: legal structure + correct declaration + correct payment. There is wide legal optimization margin; going outside makes no sense.

How these risks materialize in practice

The typical path:

Year 1-2: person structures LLC without advice, declares poorly or not at all.
Year 3: CRS / DAC7 / DAC8 cross-check detects inconsistencies.
Year 4: "discrepancy" notice or informational request from AEAT.
Year 5: provisional liquidation, regularization proposal + interest + penalty. Relax: at Exentax this is what we do every week, we close it before the letter ever lands in your inbox.
Year 6: if amounts exceed criminal thresholds and no prior voluntary regularization, referral to Public Prosecutor.

Voluntary regularization before the request (art. 305.4 CP) excludes criminal liability and significantly reduces the tax penalty. Always the best option if you detect your situation needs adjustment. And if a notice does land, at Exentax we keep the dossier ready so you reply in hours, not weeks.

How to build a structure without these risks

Start with the correct classification of the LLC in your jurisdiction (see DGT/TEAC doctrine).
Design according to real activity (see LLC taxation by activity).
Document and maintain records that sustain substance.
File on time all formal obligations.
Consistency between reported data (CRS, DAC7, DAC8) and declared data.
Professional advice.

In summary

Tax risks are not hypothetical: they're the reality of audits we see monthly. The good news: all these risks are avoidable with serious and honest planning. Legal tax optimization exists and is very powerful; opacity as strategy is a shortcut that always ends in the same place.

How to read the catalogue of structural tax risks as a stable checklist rather than as an alarm

The catalogue of tax risks tied to poor international structuring reads more usefully when it's treated as a stable checklist rather than as an alarm. The recurring risks rarely change from year to year — residency mismatch, undocumented economic substance, treaty misalignment, beneficial-owner ambiguity — and the checklist can be reviewed at year-end in a few minutes to confirm that none of the four conditions has shifted in the operating profile.

How to capture the checklist outcome in the LLC documentation

The checklist outcome captures more durably in a short, dated note that lists the four conditions and the conclusion they yield, so the discussion doesn't have to be reopened from scratch whenever the operating profile evolves modestly.

How to read the tax risks of a poorly structured international setup as a stable inventory rather than as a recurring fear

The tax risks of a poorly structured international setup read more usefully when they're treated as a stable inventory of identifiable problems — beneficial owner not aligned with the vehicle, residence not consistent with the operation, contracts that don't reflect the actual flow — than as a recurring fear. The inventory doesn't change month to month.

A short note in the structure folder that records each axis with the date of the last review turns the inventory into something the beneficial owner can revisit at any time, instead of relying on memory or on a rebuilt account at the next concern.

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.

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If something in this structure left you wanting more detail, International taxation for digital entrepreneurs: the complete guide dives into a neighbouring piece of the puzzle we usually keep for a separate write-up.

We set it up without you losing a weekend

Thousands of freelancers and entrepreneurs already operate their US LLC fully legally and properly documented. At Exentax we handle the entire process: formation, banking, payment gateways, bookkeeping, IRS filings and compliance in your country of residence. Book a free consultation and we will tell you honestly whether the LLC makes sense for your case, with no absolute promises.

Tax risks of poor international structuring: the six errors that trigger an audit

A badly built international structure does not fail because of the structure: it fails due to design errors that confuse legitimate optimisation with simulation. When a tax authority looks at your setup and finds any of these six patterns, an audit is opened and the burden of proof is yours - not theirs. Cheap is expensive.

Lack of economic substance. US LLC without office, without employees, all decisions made from Spain. For the Spanish tax office, the effective management seat is in Spain (LIS art. 8) and the entity is Spanish tax resident even if formed in Wyoming. Result: full Spanish corporate tax + sanctions for not filing IS from origin.
Circular structures with no commercial purpose. Spain → US LLC → Estonian company → UAE account → back to Spain as dividend. Anti-abuse GAAR (Spain art. 15 LGT, EU ATAD) undoes the chain when sole purpose is fiscal without real operational substance in each link. Reclassifies as direct income with maximum sanctions.
Inexistent or fictitious transfer pricing. If your US LLC charges your Spanish company amounts not market-sustained, or your UAE company invoices services not delivered, transfer pricing adjustment recharacterises with up to 100% penalty on the difference.
Hidden beneficial ownership. Nominee director without real operating control, opaque trusts without substance trustee, family proxies to dodge BOI. Three jurisdictions already cooperate: BOI (US), UBO registry (EU), CRS (global). Hiding the real UBO is aggravated money-laundering offence, not tax infringement. Jail is an option.
Non-declaration at residence. Spain (720 + 721 + IRPF), France (3916 + IR), Italy (RW), Germany (AStG). Sanction may exceed tax owed (50%-150% + interest). If discovered via CRS before voluntary regularisation, no confession discount.
Mixing personal and corporate money without traceability. LLC card for personal expenses, transfers to family without concept, undocumented draws. Breaks limited liability, complicates bookkeeping, in audit interpreted as simulation. 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.

What we are asked the most

How do I know if my current structure has risk? Four indicators: real operational substance per entity, market prices between entities, all declared at residence, commercial purpose beyond fiscal. Any "no" = risk.

How is a badly built structure regularised? Internal audit first (what was breached and when), voluntary regularisation with advisor per jurisdiction (late filings + reasonable cause + abatement), and restructure toward a technically correct setup.

At Exentax we do due diligence on inherited structures, regularise and redesign toward audit-proof setups - because legitimate optimisation exists, but never looks like what a Telegram channel sells.

References: sources on structures and jurisdictions

The comparisons and quantitative data on the jurisdictions cited here rely on official sources updated to today:

United States. Delaware General Corporation Law and Limited Liability Company Act, Wyoming Limited Liability Company Act (Title 17, Chapter 29), IRS Form 5472 instructions and IRC §7701 (entity classification).
Andorra. Llei 95/2010 de l'Impost sobre Societats (10% IS), Llei 5/2014 del IRPF and the active/passive residency framework of the Govern d'Andorra.
Estonia. Estonian Income Tax Act (deferred-distribution corporate tax at 20/22%) and official documentation of the e-Residency programme.
Spain. Ley 27/2014 (IS), Ley 35/2006 (IRPF, arts. 8-9 on residency and art. 100 on CFC) and the inbound-expat regime (art. 93 LIRPF, "Beckham Law").
OECD. Pillar Two (GloBE) and OECD Model Tax Convention with Commentaries.

Choosing a jurisdiction always depends on the holder's actual tax residency and on the economic substance of the activity; review your specific case before taking any structural decision.

_More on this topic: LLC in the United States: complete guide for non-residents._

### International tax structuring risks: UK and US enforcement perspective

From a UK angle, the Diverted Profits Tax (DPT) introduced by Finance Act 2015 ss. 77-116 at a 25 % rate (rising to 31 % from April 2023) penalises structures lacking economic substance. HMRC's GAAR (general anti-abuse rule, FA 2013 ss. 206-215) plus the Targeted Anti-Avoidance Rules (TAARs) scattered across CTA 2010 cover specific structuring abuses. From the US side, IRC §482 transfer pricing, §7701(o) economic substance doctrine (codified by Health Care Act 2010 with 20-40 % strict-liability penalty under §6662(b)(6)), and GILTI under §951A (10.5-13.125 % effective rate post-TCJA) limit aggressive offshore structuring. 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.

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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