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

International structures fail when residency, CFC exposure, beneficial ownership, banking, contracts and money flows do not match. These are the risks to review before operating.

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 <a href="/en/blog/us-llc-for-non-residents-tax-structure">US LLC</a> 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). The Exentax approach is practical: confirm the data, prepare the evidence and close the next step.

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 <a href="/en/blog/international-tax-design-3-jurisdictions-max-no-cfc">designing a solid international structure</a>.

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:

  1. Control: the taxpayer holds 50% or more in the non-resident entity (thresholds may vary).
  2. Low taxation: the non-resident entity's effective taxation is less than 75% of what would correspond in Spain (a typical disregarded LLC may have no substantive US federal tax, so the low-tax analysis must be reviewed locally).
  3. 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 <a href="/en/blog/llc-tax-by-activity-services-saas-and-trading">LLC taxation by activity</a>).

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. Exentax brings method to the file: context, proof, execution and review.

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 <a href="/en/blog/international-tax-residency-with-a-us-llc">international tax residency and documentary proof</a>.

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. In an Exentax file, the source record comes first and the response follows from it.

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 <a href="/en/blog/international-tax-design-3-jurisdictions-max-no-cfc">designing a solid international structure</a>.

Risk 5: Treaty shopping and DTT abuse

The Spain-US DTT modifying Protocol signed in 2013 and in force since 27 November 2019 (<a href="https://www.boe.es" target="_blank" rel="noopener">BOE</a> 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 map the exposure early, prepare the reasonable-cause file and reduce avoidable escalation before the authority controls the timeline.

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:

  1. Year 1-2: person structures LLC without advice, declares poorly or not at all.
  2. Year 3: CRS / DAC7 / DAC8 cross-check detects inconsistencies.
  3. Year 4: "discrepancy" notice or informational request from AEAT.
  4. Year 5: provisional liquidation, regularization proposal + interest + penalty.
  5. 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. Exentax closes the gap with a reviewed record and a clean execution path.

How to build a structure without these risks

  1. Start with the correct classification of the LLC in your jurisdiction (see <a href="/en/blog/dgt-teac-and-feb-2020-boe-doctrine-on-the-us-llc">DGT/TEAC doctrine</a>).
  2. Design according to real activity (see <a href="/en/blog/llc-tax-by-activity-services-saas-and-trading">LLC taxation by activity</a>).
  3. Document and maintain records that sustain substance.
  4. File on time all formal obligations.
  5. Consistency between reported data (CRS, DAC7, DAC8) and declared data.
  6. Professional advice.

The operating point to keep in mind

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.

Four inconsistencies create most tax risk

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.

Operating checkpoint: Tax risks of bad international structuring

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.

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Want a professional review of your structure to detect and correct risks before the AEAT does? book your strategic review.

If something in this structure left you wanting more detail, <a href="/en/blog/international-tax-for-digital-businesses">International taxation for digital entrepreneurs: the complete guide</a> dives into a neighbouring piece of the puzzle we usually keep for a separate write-up.

Fix the structure before the risk becomes visible

Most international-tax problems start as small inconsistencies: wrong payer, weak invoice, mixed funds, unclear control or a bank profile that tells a different story from the website. Exentax closes those gaps before they become evidence against the structure.

The risky structure is the one that ignores facts: residence, management, client geography, banking, documentation and money movement. Fix those facts before adding another country or entity.

_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. The Exentax approach is practical: confirm the data, prepare the evidence and close the next step.