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A practitioner-focused tour of OECD transfer pricing methods—CUP, RPM, cost plus, TNMM, and profit split—with Amount B, functional analysis, and how to document method selection defensibly.
Borys Ulanenko
CEO, ArmsLength AI
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The five standard OECD transfer pricing methods are CUP, resale price, cost plus, TNMM, and profit split. CUP compares the controlled price directly with an uncontrolled price. Resale price and cost plus test gross returns for routine distributors or suppliers. TNMM tests a one-sided net margin. Profit split divides combined profit where both sides make unique or highly integrated contributions.
| Method | Best first question | Usually tests | Strongest when | Dedicated guide |
|---|---|---|---|---|
| CUP | Is there a true uncontrolled price for the same or very similar transaction? | Price | Commodity, raw material, financing, or royalty evidence is highly comparable | CUP guide |
| RPM | What gross margin should the reseller keep from the third-party resale price? | Distributor gross margin | A routine buy-sell reseller adds limited value before resale | RPM guide |
| Cost plus | What gross mark-up should the supplier earn on a reliable cost base? | Supplier gross mark-up | A routine manufacturer, toller, or service provider performs limited-risk work | Cost plus guide |
| TNMM | Does the tested party earn an arm's length operating return? | Net margin / PLI | A one-sided net-profit test can be applied reliably and suitable comparable evidence is available | TNMM practical guide |
| Profit split | How would independent parties split combined profit from integrated value creation? | Combined profit allocation | Both parties make unique contributions or operations cannot be tested one-sidedly | Profit split guide |
This guide compares the five recognized methods and helps narrow the choice. For execution details, go to the method-specific guides: CUP, RPM, cost plus, profit split, and CPM vs TNMM. For calculation mechanics, see transfer pricing methods with examples and the method-selection guide.
Where the applicable law uses the arm's length principle, conditions in controlled transactions—such as sales of goods, services, licences, or financing—are tested against the conditions independent enterprises would have agreed in comparable circumstances. Article 9 of the OECD Model Tax Convention supplies the treaty framework; domestic law controls how the standard applies in each jurisdiction.
In practice, "arm's length" is not self-defining. You need a structured, defensible mechanism to translate the principle into a number. That is the purpose of transfer pricing methods.
A method that does not fit the transaction or is applied inconsistently can support an incorrect result and make the position harder to defend. Method selection therefore needs to be documented as a conclusion from the facts rather than treated as a standard label.
The OECD Transfer Pricing Guidelines (Chapter II, ) frame the objective as finding the most appropriate method for the particular case. Under paragraphs 2.3 and 2.4, a traditional transaction method is preferred when it and a transactional profit method can be applied with equal reliability; if CUP and another method can be applied with equal reliability, CUP is preferred.
If you are new to the vocabulary, start with our introduction to transfer pricing and the ultimate guide to the arm's length principle. This article focuses on how methods differ, when each tends to fit, and what practitioners get wrong in documentation.
The diagram below groups the five OECD standard methods by family—transactional (price or gross margin) versus profit (net margin or combined profit).
Click the diagram to open the full-resolution PNG in a new tab.
These methods analyze the price of the transaction itself (or a gross margin derived from it).
| Method | What it measures | Primary use case |
|---|---|---|
| Comparable Uncontrolled Price (CUP) | Transaction price | Commodities, raw materials, some IP licenses |
| Resale Price Method (RPM) | Gross margin of the reseller | Distributors with limited value-add |
| Cost Plus Method (cost plus) | Gross mark-up on costs | Contract manufacturers, many low-risk service providers |
These methods analyze net profit arising from the controlled transaction (or allocate combined profit).
| Method | What it measures | Primary use case |
|---|---|---|
| Transactional Net Margin Method (TNMM) | Net profit relative to an appropriate base | One-sided cases with a reliable tested party, segmentation, PLI, and comparable evidence |
| Transactional Profit Split Method (PSM) | Combined profit divided between parties | Unique intangibles, highly integrated operations |
Gross-margin methods (RPM and cost plus) are particularly sensitive to consistent classification between cost of goods sold and operating expenses. TNMM may be less affected by some product differences, but it still requires reliable functional comparability, a suitable PLI, transaction-level financials, and justified adjustments.
The CUP method compares the price charged in a controlled transaction to a comparable uncontrolled transaction under comparable circumstances. If conditions are sufficiently comparable, the uncontrolled price provides a direct arm's length measure.
| Strengths | Limitations |
|---|---|
| Most direct method; closest to the arm's length ideal when CUP quality is high | Demands near-identical products, contracts, and economics |
| Often preferred when a credible CUP exists | Small differences in product or terms can swing price materially |
| Avoids profit-level comparables search when price comparables are sound | Often impractical for differentiated goods, bundled offerings, or novel intangibles |
describes CUP as the most direct and reliable way to apply the arm's length principle when a sufficiently comparable uncontrolled transaction exists—while acknowledging that achieving that level of comparability is often difficult in practice.
RPM starts from the resale price to an independent customer, then subtracts an appropriate gross margin that reflects the reseller's functions, assets, and risks.
Formula (conceptually): Transfer price ≈ Third-party resale price − Appropriate gross margin
| Strengths | Limitations |
|---|---|
| Well-suited to distribution-focused tested parties | Sensitive to how revenue, COGS, and discounts are classified |
| Less demanding on product comparability than CUP (in the right fact pattern) | Gross margins vary materially across business models even within industries |
| Can fit distribution where the resale gross margin is reliably comparable | Not a good fit if the reseller materially transforms the goods or makes unique contributions |
For RPM, functional similarity is more important than product identity—but comparability of the property transferred still matters. The OECD allows broader product differences under RPM than under CUP, provided the reseller's functions, assets, risks, and economic circumstances are genuinely comparable. That said, comparing distributors across very different industries requires strong justification and careful adjustments; it is not a blanket license.
Amount B (in adopting jurisdictions) can provide a simplified and streamlined approach for certain baseline marketing and distribution activities, using a matrix-based return on sales outcome rather than a full RPM or TNMM study for eligible distributors. The transaction must satisfy the detailed scope criteria, including that it can be reliably priced with a one-sided method using the distributor as the tested party. Ownership of unique and valuable intangibles or assumption of economically significant risks may make that one-sided analysis unreliable, but performing a function associated with DEMPE is not, by itself, a stated automatic exclusion. Treat adoption status, elections, and scope as jurisdiction-specific.
If you need the parallel US terminology comparison, see CPM vs TNMM—US Comparable Profits Method aligns with OECD TNMM, not with RPM.
Cost plus applies an appropriate gross mark-up to the supplier's direct and indirect costs incurred in the controlled supply. The cost base, accounting classification, functions, assets, risks, and comparable gross mark-up all need consistent support.
Formula (conceptually): Transfer price ≈ Cost base + Appropriate gross mark-up
Gross vs net—do not conflate cost plus and TNMM. The OECD cost plus method applies a mark-up to production costs to arrive at a gross profit. By contrast, TNMM's net cost plus PLI applies operating profit to total costs (COGS + operating expenses) to measure operating profitability. Different cost bases, different profit lines, different comparables universe.
In OECD language, "cost plus" typically means mark-up on costs (gross return on costs). In US practice, "CPM" most commonly refers to the Comparable Profits Method—a net margin method aligned with TNMM. Do not conflate the two acronyms when talking to mixed US/OECD teams.
| Strengths | Limitations |
|---|---|
| Strong fit for many low-risk manufacturing or routine service entities | Sensitive to what is included in "cost" and how pass-throughs are treated |
| Economically intuitive where value is created through efficient execution | Mark-up benchmarking requires comparable cost accounting patterns |
| Supported by comparables in many routine services settings | Weak fit where intangibles, risks, or outbound marketing drive profit |
highlights typical strong use cases for cost plus—semi-finished goods sold between affiliates, long-term buy-and-supply arrangements, and many controlled services transactions.
For qualifying supportive services that are not part of the group's core business, OECD Chapter VII describes an elective simplified approach with a 5% mark-up on the relevant cost pool and no benchmarking study for that mark-up. The eligibility conditions and cost-pool rules are narrow. Domestic adoption and any local differences must be confirmed before the approach is used.
LVAIGS eligibility is narrower than it looks: services of corporate senior management, R&D, purchasing raw materials used in manufacturing or production, and financial transactions are among the categories the OECD excludes. Document why a service qualifies before defaulting to the 5% mark-up.
TNMM examines the net profitability of the tested party relative to an appropriate base (commonly sales, total costs, or assets) and compares that outcome to independent comparable companies.
The profitability ratio is the profit level indicator (PLI). Common PLIs include:
| PLI | Formula (conceptual) | Typical use |
|---|---|---|
| Operating margin (OM) | Operating profit ÷ Revenue | Distribution, services |
| Net cost plus (NCP) | Operating profit ÷ Total costs | Contract manufacturers, shared services |
| Berry ratio | Gross profit ÷ Operating expenses | Very narrow: see caution below |
| Return on assets (ROA) | Operating profit ÷ Assets | Asset-heavy operations |
Berry ratio—use with extreme care. The OECD warns that Berry ratios are frequently applied in inappropriate circumstances. A Berry ratio is only suitable where the entity's value contribution is proportional to operating expenses and is not materially driven by the value or volume of products sold. Intermediaries that take inventory risk, perform significant sales or marketing functions, or contribute meaningful intangible value are generally not appropriate Berry ratio candidates. See our Berry ratio guide for the full conditions and worked examples.
For deeper PLI selection guidance, see our PLI selection guide and benchmarking study guide.
A TNMM analysis typically requires a structured comparables search, quantitative screens, adjustments where warranted, and a defensible arm's length range. The OECD does not mandate a specific statistical tool, but notes that methods such as the interquartile range may help narrow the range where residual comparability defects remain (see IQR calculation and IQR vs full range for jurisdictional practice).
Practice tip: retain a traceable, source-backed rationale for why each comparable candidate failed screening, not only why the accepted companies remained. That record allows another reviewer to reproduce the search.
AI-assisted benchmarking platforms can compress parts of this workflow while preserving an audit trail—particularly helpful when teams must defend accept/reject decisions at scale across many transaction types.
| Strengths | Limitations |
|---|---|
| Works across many business models when tested party selection is correct | Can mask economic differences if PLI/base mismatch |
| Large independent-company data availability for many jurisdictions | Requires disciplined tested-party and PLI narrative |
| Results can be reproduced when the data and calculation are retained | Company-specific items and accounting differences can distort the comparison |
A TNMM result may be used as a corroborative check when another method is primary. A material conflict between methods should be investigated rather than averaged mechanically: check the transaction, comparability, accounts, assumptions, and whether each method actually tests the same controlled dealings.
For in-scope baseline distributors in adopting jurisdictions, Amount B can replace a full TNMM comparable exercise with a matrix outcome. It does not eliminate TNMM in non-adopting jurisdictions or where the transaction cannot be reliably priced with a one-sided method using the distributor as the tested party. Ownership of unique and valuable intangibles or assumption of economically significant risks may indicate that the one-sided test is not reliable; DEMPE involvement alone is not an automatic exclusion.
PSM starts from combined profit and asks how independent parties would split it. Common variants include:
| Strengths | Limitations |
|---|---|
| Can be the only coherent approach when reliable one-sided comparables do not exist | Needs robust financial data for both parties (and often careful segmentation) |
| Reflects integrated value creation | Split keys and profit definitions are inherently judgment-heavy |
| OECD post-BEPS guidance emphasizes PSM for certain unique-contribution cases | Documentation intensity and controversy risk are typically higher |
discusses profit split in contexts involving unique and valuable contributions—not only as a method of last resort when everything else fails.
For hard-to-value intangibles, OECD Chapter VI permits tax administrations to treat ex-post outcomes as presumptive evidence about the appropriateness of the ex-ante pricing arrangements, subject to the framework's stated exemptions. Preserve the forecasts, assumptions, information available at pricing, sensitivity analysis, and explanations for material differences between projected and actual outcomes.
The OECD also recognizes that when reliable comparables for intangibles do not exist, valuation techniques—particularly income-based or DCF-style approaches—may be useful as part of the arm's length analysis (Chapter VI). This is especially relevant for IP transfers, cost-sharing buy-ins, and restructuring compensation where PSM or CUP cannot produce a credible benchmark on their own.
An Amount B out-of-scope conclusion does not select the transfer-pricing method. Apply the ordinary most-appropriate-method analysis. If the transaction cannot be reliably priced with a one-sided method, that fact may support considering profit split or another method, but the conclusion must follow from the functions, contributions, risks, and available evidence.
The OECD recognizes five methods but does not prohibit other methods. allows an alternative where it is more appropriate to the facts and consistent with the arm's length principle. The file should explain why the recognized methods were regarded as less appropriate or not workable and why the selected alternative is appropriate.
An income-based valuation, including a discounted cash flow model, may be relevant in situations such as:
Using an alternative method does not remove the need for support. Explain why the recognized methods were less appropriate or not workable and why the selected technique is appropriate and consistent with the arm's length principle.
The OECD frames this as accurate delineation of the actual transaction: before selecting a method, you must document functions, assets, and risks and test whether the contractual allocation of those elements is consistent with actual conduct:
The party with more complex operations, more valuable intangibles, and more significant economically substantiated risk generally earns a higher return—and is often not the right tested party for one-sided methods.
Method selection should read like a conclusion from the functional analysis and accurate delineation, not a template selected before the facts. State the evidence for risk control and financial capacity rather than relying on contractual labels.
For methodology on tested party choice, see tested party selection guide.
OECD guidance ( to ) requires selecting the method most appropriate to the circumstances, considering the transaction, comparability, and available reliable data. Traditional transaction methods are preferred over profit methods when both are equally reliable; CUP is preferred when it and another method are equally reliable. Practical selection factors include:
OECD vs US §482 terminology at a glance. The OECD's “most appropriate method” framework and the US “best method rule” are separate legal analyses, although both focus on reliability under the facts. Key naming differences include:
When working across OECD and US frameworks, map the terminology before comparing conclusions. See CPM vs TNMM for a full comparison.
Use this screen before writing the method narrative. It keeps the analysis practical without pretending there is a mechanical hierarchy.
| Step | Question | If yes, consider | If no / weak evidence |
|---|---|---|---|
| 1 | Is there a reliable uncontrolled price for this transaction? | CUP first, especially for commodities, raw materials, loans, or closely comparable licenses | Move to gross or profit methods |
| 2 | Is the routine party a reseller with a reliable third-party resale price? | RPM, if gross-margin comparability is strong | TNMM may be more reliable if COGS/OPEX classification or channel mix is noisy |
| 3 | Is the routine party a supplier whose costs are a reliable value driver? | Cost plus, if the cost base and gross mark-up are comparable | TNMM/net cost plus if gross cost bases cannot be reconciled |
| 4 | Is one party clearly less complex and reliably benchmarkable at net level? | TNMM, with a defensible PLI and tested-party story | Profit split or another method may be needed |
| 5 | Do both sides contribute unique value or operate as an integrated business? | Profit split, often residual profit split if routines can first be benchmarked | Avoid profit split if a reliable one-sided method actually works |
The narrative should explain why rejected methods are less reliable, not merely state the selected method. A concise rejection table is often enough: CUP unavailable because no comparable price exists; RPM rejected because gross margins are distorted by embedded services; cost plus rejected because the supplier owns non-routine intangibles; TNMM rejected because neither party is routine.
| Transaction type | Often-primary methods | Common alternatives |
|---|---|---|
| Commodity purchase/sale | CUP | TNMM |
| Baseline distribution (Amount B eligible, adopting jurisdiction) | Amount B (SSA) | TNMM / RPM |
| Finished goods distribution | RPM or TNMM | CUP (rare, if resales are comparable) |
| Contract manufacturing | Cost plus or TNMM | — |
| Toll manufacturing | Cost plus | TNMM |
| Routine intra-group services | Cost plus, TNMM, or CUP (direct-charge where comparable third-party fees exist) | LVAIGS 5% simplified approach for qualifying supportive services |
| IP license (good external comparables) | CUP | TNMM sanity check |
| IP / intangibles (unique, integrated) | PSM | Residual structures with TNMM for routines |
| Highly integrated / digital operating models | PSM | Transactional methods only for clearly separable pieces |
| Financial transactions (Chapter X) | CUP-style pricing for loans (yield approach, credit analysis); specialized methods for guarantees, cash pools, hedging, captive insurance | Threshold question: is the purported debt respected as debt or re-characterized as equity? Risk-free / risk-adjusted return analysis for certain arrangements |
US practitioners should also reference the best method rule under IRC §482 and the specific regulations (§1.482-3 through §1.482-6) when documenting method selection for US-filed returns.
Amount B was incorporated into the OECD Guidelines as an Annex to Chapter IV in February 2024 and is available for fiscal years beginning on or after 1 January 2025 where the relevant domestic framework applies it. It provides a simplified and streamlined approach for specified baseline marketing and distribution activities; it is not an additional recognized transfer-pricing method.
Scope is broader than just buy-sell distributors. Amount B also covers certain sales agents and commissionaires performing qualifying baseline activities. Transactions involving commodities, non-tangible goods, or services are outside the qualifying transaction definition. The remaining scope criteria include whether the transaction can be reliably priced with a one-sided method using the distributor as tested party; ownership of unique and valuable intangibles or assumption of economically significant risks may prevent that conclusion.
The pricing framework has several moving parts:
Implementation is jurisdiction-specific: verify the applicable domestic rules, effective period, elections or options, scope, exclusions, and documentation directly with the relevant tax authority.
If Amount B is available, document why the transaction is in or out of scope using the actual functions and facts. A contractual “distributor” label does not establish eligibility.
The OECD's 2026 Manual on Effective Mutual Agreement Procedures provides current procedural guidance for competent authorities and taxpayers using MAP. A method file should preserve the facts, agreements, calculations, and adjustment history that may be needed if double taxation later requires treaty relief.
Prepare the method narrative, comparable-screening rationale, and supporting functional analysis contemporaneously under the applicable documentation rules. Reconstructing the reasoning later makes it harder to show which facts and information were available when the price was set.
Transfer pricing methods are only as strong as the analysis underneath them. The most defensible files tend to share three traits:
If you want to tighten benchmarking execution specifically, start with the benchmarking study guide and the quantitative screening filters playbook. The AI in transfer pricing framework explains how to use automation for evidence and screening while retaining professional approval over method selection and conclusions.
There is no default "best" method. The OECD framework asks for the most appropriate method for the particular case, given reliability of comparables and data. However, the OECD does maintain a hierarchy: traditional transaction methods (CUP, RPM, cost plus) are preferred over profit methods when both can be applied with equal reliability, and a reliable CUP takes priority over all other methods. In practice, TNMM is common because net margin data is frequently available—but prevalence does not mean automatic correctness.
They are closely analogous one-sided net-profit methods, but they are not the same legal rule. TNMM is described in the OECD Guidelines and applied through relevant domestic law; CPM is defined in US Treasury Regulation §1.482-5. See the TNMM and CPM guide.
When you can demonstrate high-quality comparability on price for the controlled transaction—often in commodities, certain raw materials, or some licensable IP with close uncontrolled evidence.
Because unique intangibles and integrated development may make one-sided benchmarks unreliable for either party. PSM is designed for consolidated profit allocation problems that TNMM cannot slice cleanly.
No. Amount B addresses specified baseline marketing and distribution transactions where the relevant domestic framework applies it. Transactions outside its scope still require the method analysis prescribed by the applicable law.
Retain the database and release, access date, full search logic, initial population, sequential filter counts, raw results, source evidence, company-specific accept or reject reasons, financial mapping, adjustments, and range calculation. The benchmarking study guide provides the full reproducibility checklist.
Refresh timing should follow the applicable documentation rules and the facts. A material business change, acquisition, new intangible, changed transaction, or altered functional profile may require a new search or analysis rather than a mechanical roll-forward.
For qualifying supportive intra-group services that are not part of the core business, OECD Chapter VII offers an elective simplified approach: a 5% mark-up on pooled costs with no requirement for a full benchmarking study. The service must genuinely be low value-adding—services of corporate senior management, R&D, purchasing raw materials used in manufacturing or production, and financial transactions are among the excluded categories.
HTVI refers to intangibles for which no reliable comparables exist and projections or valuation assumptions are highly uncertain at transfer. OECD Chapter VI permits ex-post outcomes to be used as presumptive evidence about the ex-ante pricing arrangements, subject to stated exemptions and safeguards.
Yes. permits other methods when they are more appropriate to the facts and consistent with the arm's length principle. Explain why the recognized methods were less appropriate or not workable and why the alternative technique, such as a supported DCF or income-based valuation, is appropriate.