Executive answer
The profit split method allocates combined profit or loss from a controlled transaction among related parties according to their contributions. It may be appropriate where both parties contribute unique and valuable intangibles, operations are highly integrated, or parties share economically significant risks that cannot be evaluated reliably in isolation.
Article 180 of the Mexican Income Tax Law recognizes profit split and residual profit split. Application requires more than a lack of comparables. The transaction must be delineated, the weakness of a unilateral method demonstrated, combined profit defined and objective allocation factors linked to value creation selected.
Consistency is the central challenge. The income and cost perimeter should match the dealing, accounting policies across entities should be aligned, and factors should measure contribution instead of producing a desired result. A sophisticated formula does not repair a generic FAR.
When to evaluate profit split
Consider it when several parties develop or exploit unique intangibles; when design, production, platform and market activity are so integrated that no simple tested party exists; or when both control interdependent significant risks. It may also be relevant to bilateral digital, financial or technology value chains.
Do not use it merely because one entity has losses, comparables are scarce or the transaction is material. First assess CUP, routine returns and a reliable tested party. Administrative complexity does not prove economic integration.
Evidence includes decisions, people, assets, intangibles, funding and risk control. A “co-development” label without budgets, teams or authority is insufficient.
Total and residual split
A total split allocates all relevant combined profit using factors reflecting all contributions. It may fit where routine contributions cannot be separated or integration is complete.
A residual split first rewards basic routine functions using comparables and then allocates the residual associated with unique contributions. Avoid double counting: residual factors should not reward a function already compensated.
Selection depends on delineation and data. Explain why the stages represent value creation rather than a construction designed for a tax-rate result.
Eligibility test
- Is the transaction delineated and separated from other dealings?
- Does more than one party contribute something unique and valuable?
- Are activities highly integrated?
- Are significant risks shared and jointly controlled?
- Is CUP or another direct method unreliable after analysis?
- Is there a less complex party with reliable comparables?
- Can combined profit be measured consistently?
- Do observable factors linked to value exist?
- Can double remuneration be avoided?
- Can the model be operated and audited?
Negative answers on contributions and data may favor another method. Preserve the tree and alternatives.
Define combined profit
Set products, territories, entities, periods and dealings. Determine whether gross, operating or another profit measure is divided and why. Include only income and cost linked to the perimeter.
Align revenue recognition, depreciation, R&D, marketing, stock compensation, leases, currency and extraordinary-item policies. Convert to one currency and period. Eliminate internal dealings inside the perimeter.
Prepare bridges from each entity’s statutory statements to segments and from segments to combined profit. Retain adjustments and owners.
Perimeter matrix
| Component | Entity A | Entity B | Elimination | Combined | Rule |
|---|---|---|---|---|---|
| External revenue | Product/territory | ||||
| Internal revenue | Eliminate | ||||
| Direct costs | Traceability | ||||
| R&D | Project | ||||
| Marketing | Market | ||||
| Operations | Function | ||||
| Extraordinary | Risk control | ||||
| Profit | Approved definition |
If this bridge cannot be built, application is not auditable.
If a proposed profit split starts with negotiated percentages rather than reconciled combined profit and proven contributions, pause the calculation and validate eligibility.
Select allocation factors
An allocation factor approximates contribution to value creation. Candidates include relevant expenditure, specialized personnel, time, assets, capital, users, data, decisions or a combination. Availability does not make a factor appropriate.
For intangibles, historical R&D spending may be an imperfect signal: cost is not value, periods differ and risks vary. Adjust useful life, success and contribution where a basis exists. For marketing, revenue does not necessarily measure brand creation.
Document causal link, source, period, weight and sensitivity. Avoid weights without evidence. Qualitative analysis may inform weighting but should be explicit and approved.
Factor matrix
| Contribution | Candidate indicator | Strength | Limitation |
|---|---|---|---|
| Technology development | R&D, people, hours | Traceable | Cost is not value |
| Commercial intangible | Relevant marketing | Historical observation | Mixes routine and creation |
| Platform | Assets and developers | Links infrastructure | Obsolescence |
| Financial risk | Economic capital | Relates to capacity | Complex modeling |
| Market | People and decisions | Reflects execution | Relationships hard to value |
| Data | Users, volume, quality | Operating metric | Quantity is not utility |
Test alternative factors and explain why the selected measure is more reliable.
Routine returns in a residual split
Identify routine manufacturing, distribution, service or finance. Select a method and comparables to assign the basic return. Use consistent accounts and bases.
Then calculate residual: combined profit less routine returns. If the combined result is a loss, determine whether the formula shares losses and whether parties control the risks. Do not guarantee positive returns that contradict the model.
Avoid paying the same routine function through both cost remuneration and allocation factor. Document every bridge.
Technology scenario
One foreign entity develops architecture while Mexico develops modules, adapts the market and controls launch. Both contribute unique teams and integrated decisions. Comparable licenses do not exist.
Define product, external revenue and costs. Reward separable routine support. Allocate residual using a supported combination of adjusted R&D, key people and decisions, linked to project systems.
Test sensitivity. If small weight changes move substantial profit, disclose uncertainty and strengthen evidence.
Loss scenario
The product fails and produces a combined loss. The agreement allocates it to one entity, but both decided development and launch. Profit split should consider control and capacity, not only success.
Determine whether profit factors also apply to loss. Different risks may require analysis. Document causes, decisions and mitigation. Do not change the formula retrospectively to protect one entity.
Data availability
The method requires segmented books from several entities. Define a common chart, currency, calendar, eliminations and governance. Automate extraction where volume is high.
Data should exist during the year, not be reconstructed only at closing. If one jurisdiction does not provide detail, assess reliability and alternatives. Information asymmetry creates defense risk.
Preserve versions and sources. Allocation factors should not be manually edited without approval.
Operating implementation
Budget combined profit and factors. Estimate provisional payments, invoicing and true-ups. Monitor changes in people, projects, assets and decisions.
Define who approves perimeter, accounts, routine returns and weights. Coordinate VAT, withholding, customs and currency. An annual profit split may be technically sound but create complex flows and documentation.
Establish a band and scenarios. Do not use the method to strip profit automatically from one entity; apply the approved formula to facts.
Common errors
- Using it because comparables are scarce without unique contributions.
- Setting percentages before combined profit.
- Mixing products or territories.
- Failing to align accounting.
- Treating cost as value without analysis.
- Duplicating routine returns.
- Ignoring losses.
- Changing weights after seeing results.
- Omitting sensitivity.
- Failing to coordinate invoicing and taxes.
Quality control
Profit Split Feasibility delivers the decision tree, FAR, alternatives, perimeter, accounts, routine returns, factors, sensitivity and operating process. A second team reproduces bridges and formula.
Leadership validates contributions; finance combined profit; tax method; operations factors; legal agreements. Material changes require approval and an effective date.
Ex-ante evidence and factor changes
Define allocation factors before the final profit is known wherever possible. Preserve the business case, budget, owners, metrics and weighting reasons. That evidence shows the formula follows value creation rather than a retrospective result.
People, projects, intangibles or capital may change during the year. Set thresholds for refreshing factors and determine whether a change applies prospectively or reflects an economic transfer. Do not merely edit percentages; document date, cause, approvals and potential compensation.
Compare budgeted and actual factors. A change in hours may reflect volume or inefficiency; a spending change may reflect price or a new function. Understand the nature before changing allocation.
Profit split defense file
The file should rebuild the model from statutory statements through settlement. Include perimeter, eliminations, accounting policies, FAR, alternatives, routine returns, factor sources, formula, sensitivity, invoices and reconciliation.
Perform a reverse walkthrough from the amount allocated to Mexico to combined profit and every source data point. Then walk a material account forward to its treatment. The two tests address accuracy and completeness.
Explain limitations instead of hiding them. Where a factor is approximate, show alternatives and effects. Where data arrive late, record estimation and true-up. A tax authority may challenge both eligibility and arithmetic; the file should defend both.
Related topics
- PT-017 through PT-019: FAR, comparability and method.
- PT-037 and PT-038: DEMPE and intangibles.
- PT-072: restructurings.
Profit-split eligibility workshop
Bring business, tax, finance and intangible owners together to map each party’s contributions. Identify decisions, people, unique assets, risk control, integration and realistic alternatives. Difficulty finding comparables does not by itself prove that both participants make unique and valuable contributions.
If the method is feasible, define combined profit, segmented statements and value-related splitting factors. Test currency, period, cost and tax consistency. For every factor—people, expenditure, assets or a specific metric—explain the economic relationship and sensitivity. Avoid weights chosen to reach a predetermined result.
Document alternative methods and reasons for rejection. The committee approves delineation, pool and factors before the final calculation. The workshop supports a disciplined conclusion that profit split is appropriate or, equally important, that a one-sided method is more reliable.
Sources and verification date
Perform a retrospective test once actual outcomes exist. Compare splitting assumptions with observed people, expenditure, assets and decisions. Deviations should not mechanically rewrite the past, but they should test assumption quality, the need for control changes and next-period design. Document whether each variance came from forecast uncertainty, execution or an actual functional change.
- Mexican Income Tax Law, current text, Articles 179 and 180.
- OECD Mexico Transfer Pricing Country Profile.
- OECD Transfer Pricing Guidelines.
Sources checked on August 2, 2026. Eligibility depends on contributions, integration, data and facts; this is not an automatic method.
Reassess eligibility whenever decision rights, intangibles, product scope or accounting perimeter changes materially.
Request a Profit Split Feasibility to assess eligibility, combined profit, routine returns, allocation factors and sensitivity before implementation.