Do I need TNMM in practice?

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Answer

The method selects a profit level indicator appropriate to the tested party's functions, computes it for comparables, and tests the entity's result against the range. The requirement usually turns on whether a transaction happened at all, not on how large it was.

Whether you need it

The method selects a profit level indicator appropriate to the tested party's functions, computes it for comparables, and tests the entity's result against the range. Choice of indicator and of tested party carry more weight than the database used.

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Where it does not apply

The transactional net margin method is the workhorse of transfer pricing because it tests an operating margin, and operating margins survive accounting differences that gross margins do not.

Do I need TNMM in practice?
ItemAmount
RevenueC$35,000,000
Operating margin reported1%
Operating profit reportedC$350,000
Assumed tested range4% – 8%
Profit at the bottom of the rangeC$1,400,000
Potential adjustmentC$1,050,000

A margin below the range invites an adjustment of C$1,050,000 in this jurisdiction — and unless the other country makes a corresponding adjustment, that profit is taxed twice. The documentation is what turns this into a conversation rather than an assessment.

These amounts illustrate the mechanism only. The rates and thresholds are assumptions of the example, not your numbers: each is checked against the issuing authority for your specific tax year before any return is filed.

What to do next

The full treatment — who it binds, the deadline, the penalty and the fixed fee — is on TNMM in practice. If you already have an adviser, we will tell you what they should be asking rather than replacing them.

Checked and signed off for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. General information, not advice for your circumstances — call our 24-hour helpline to discuss your own position.

Where international tax practice comes into this file

This is the page to read on international tax practice. It takes TNMM in practice in order — the test that decides who is affected, the returns and forms that follow from it, and a fee quoted in writing before anything starts.

What these engagements turn on

Case study 1

Changing the tested party and rerunning the margin analysis

A group had tested the entity that owned its technology and directed its strategy, and the resulting comparable set bore no resemblance to it. We reviewed both parties' functions and risks, identified the local sales entity as the routine one, and reran the analysis on that basis with an indicator matched to its activity. The engagement produced a documented tested party selection, a fresh search with screening and rejection reasoning recorded, and a range built on companies a reviewer could recognise as performing the same functions as the entity under test.

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Case study 2

Selecting a profit level indicator for a mixed sales and service entity

One entity resold goods and also provided installation and support, and had been tested on a single return measured against sales. The two activities had different cost structures, so the blended indicator suited neither. We split the revenue and the costs between the activities using the entity's own records, chose an indicator for each, and searched separately. The work produced two analyses in one document, an explained basis for the cost allocation between the activities, and a written note of why a single indicator had been rejected.

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Case study 3

Documenting a start-up phase against an established comparable set

A newly established entity reported margins well below its comparables while it built its customer base. We prepared the margin analysis in the ordinary way, then documented the phase itself: the timing of the set-up costs, the revenue ramp, and which of those costs an independent party entering the same market would have carried before earning a routine return. The engagement produced a range, a rejection log, and a written start-up analysis with the expected path to the range, so the early years were presented as a stage with a reason rather than as a persistent shortfall.

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Case study 4

Setting a consistent testing period across a volatile market cycle

A group's single-year results swung sharply with its end market, and successive studies had each used a different span of years, so the conclusions were not comparable to one another. We fixed the testing period on the business cycle, applied the same period to the tested party and the comparables, and restated the earlier years on that basis. The work produced a stated multi-year testing period with reasons, restated margin figures for each year in it, and a refresh procedure so later studies would not quietly change the span.

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Case study 5

One margin analysis built to serve filings in two countries

A group filed documentation in both jurisdictions and the two files disagreed on tested party and indicator, leaving the same profit exposed at both ends. We rebuilt the analysis once: a single functional description, one tested party with reasons, one indicator, and one documented search. Local presentation requirements were met by two formats over identical underlying figures. The engagement produced a consistent pair of files and a reconciliation of the earlier divergence, so an enquiry in one country would meet the same analysis the other had received.

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Case study 6

Reviewing a comparable set after an enquiry into screening criteria

An existing margin study was queried on the width of its screens, several accepted companies operating in different activities from the tested party. We rebuilt the manual review, reading each accepted company's business description and rejecting those whose functions did not match, and recording the reason in each case. The engagement produced a narrowed comparable set with a full rejection log, the tested party's result set against the revised range, and a note of the effect of the change, so the earlier and current ranges could be compared directly.

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Case study 7

An Estate That Cannot Distribute Until the Clearance Comes

An executor who distributes before the clearance certificate can be held personally liable for what is later assessed. The file prepares the final return and the estate return, and applies for the clearance in the order that lets the estate close.

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Case study 8

A Pension Taxed Where the Treaty Did Not Intend

Pension and annuity articles allocate taxing rights differently from employment income, and a flat withholding often exceeds what a return would produce. The alternative filing is elective and has a deadline.

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All case studies — every published engagement in one place.

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Wills drafted for one country routinely misfire in the other — deemed disposition here, estate tax there, credits in between.

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The deduction is taken on the sale price, not the gain — which is why an NRI property sale strands cash unless the certificate is applied for before closing.

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Residency is decided on facts, not on a form — and the year you arrive or leave is the one where the largest amounts turn on the smallest details.

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A partnership is taxed in the hands of its partners, so one engagement abroad can reach every partner's personal return. The order matters: the waiver is applied for before the invoice, the presence is tracked before it becomes an establishment, and the payroll is registered before the first day worked in the other country.

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More on TNMM in practice

Which profit level indicator should I use for a distributor?

The one that matches what the entity does and what drives its result. For a reseller the return is usually measured against sales, because sales are what its activity turns over. For a service provider or a manufacturer under low risk, costs are the better denominator, since the activity is the cost base itself. Where the entity is asset-heavy, a return on assets can be more informative. The choice carries more weight than the database you search, so state the reasoning: an indicator picked because it produced a convenient answer is visible in the file as easily as one picked on the functions.

Who should be the tested party in a TNMM analysis?

The less complex of the two — the entity whose functions are routine and which owns no valuable intangibles, because that is the entity for which comparable companies actually exist. Test the party that owns the brand and directs the group and you are looking for comparables to something unique, which is why those searches return companies resembling nothing in the transaction. The selection is a conclusion from the functional analysis, not a preference, and it should be written down with reasons. Choice of tested party and choice of indicator between them decide most of the outcome.

Does it matter which database the comparables came from?

Less than most people expect. Coverage differs between sources and that is worth noting in the file, but the outcome is driven by the decisions you make inside whichever database you use: which entity you tested, which indicator you chose, how wide the initial screen was, and which candidates you rejected on manual review. Two analysts on the same database will produce different ranges if those decisions differ. So record the source, then spend the effort on the search strategy and the rejection reasoning, which is where a reviewer's questions will actually land.

Our operating margin is below the range — what happens now?

First check the analysis rather than the result. Confirm the tested party is the right one, that the indicator suits its functions, and that the comparable set survives a proper manual review — a range built on loose screens can be wrong in either direction. If the analysis holds, the shortfall is real and the file should address it: what happened in the year, which of the causes an independent party in the same position would also have borne, and whether the pricing policy needs to change going forward. An explained shortfall is a far better position than an unexplained one.

Can I use a multi-year average instead of a single year's margin?

Multi-year data is commonly used on both sides of the comparison, because a single year can be distorted by timing — a large contract, a start-up phase, a market disruption. The requirement is consistency: if the comparables are measured over a period, measure the tested party over the same period, and say which years are in it. What does not work is choosing the span after seeing which one puts the result inside the range. Set the period on the facts of the business, state it, and keep to it in later refreshes.

Do both sides of an intercompany transaction have to use the same method?

Nothing makes it automatic, and where the two sides document differently the risk is that both countries tax the same profit. That is the practical case for one analysis the group can stand behind in both places: a single tested party, a single indicator, a stated search, and consistent figures. Where the local requirements differ, the presentation can differ while the underlying analysis does not. A margin test is well suited to this, because operating margins survive the accounting differences between jurisdictions that gross margin comparisons do not.

How would a foreign tax authority know I am resident there?

Mostly from information you or your bank already provided. Account-opening forms ask you to self-certify tax residence, and that certification is reported between authorities under the Common Reporting Standard or, for US accounts, under the FATCA framework. Beyond that: employer and payroll filings, property registries, immigration records and the tax filings of anyone who paid you. The realistic planning assumption is that the data arrives. See FATCA and information reporting.

How many days can I spend in a country before I become tax resident?

It depends on the country, and a day count is only ever the start. Many use a threshold in a tax year, some also look at averages across several years, and some have no day test at all and decide on where your home and life are. Two countries can both conclude you are resident, which is what the treaty tie-breaker exists to settle. Counting days without checking the tie-breaker is how people end up filing as resident nowhere. See the residency tie-breaker.

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