Methods & benchmarking
Interquartile Range
The interquartile range is a statistical tool used in transfer pricing to narrow a wide set of comparable results down to the middle fifty percent, removing the lowest and highest quarters. Tax authorities and the OECD Guidelines favour this range because it reduces the effect of unreliable or extreme comparables, giving a.
When a benchmarking study produces a set of comparable margins or prices, results are ranked from lowest to highest and split into four equal parts called quartiles. The interquartile range keeps only the second and third quartiles, discarding the bottom and top twenty five percent of observations. This approach is widely.
Applying the interquartile range does not remove the need for functional and comparability analysis beforehand. Practitioners must still confirm that every comparable included is genuinely similar in function, risk and market before ranking the data. Once the range is calculated, taxpayers typically test whether their actual.
In practice
What matters when applying interquartile range
- Splits ranked comparable results into four equal quartiles
- Retains only the middle fifty percent of the data set
- Reduces distortion from outlier or weakly comparable companies
- Widely used alongside median benchmarking under OECD guidance
- Does not replace the need for a robust comparability analysis
Frequently asked
Common questions
Why use the interquartile range instead of the full data range?+
The full range of comparable results often includes companies that are only loosely comparable, so extreme values can distort the picture of what an arm's length outcome looks like. The interquartile range trims the lowest and highest quarters, leaving a tighter band that reflects the central tendency of the data set.
Is a result outside the interquartile range automatically non-compliant?+
Not necessarily, but it does increase scrutiny risk. A result falling outside the interquartile range suggests the controlled transaction's pricing diverges from what independent comparable companies achieved, which can prompt a tax authority adjustment, often to the median.
See how the tooling handles this in practice
Our transfer pricing tools calculate intercompany charges, benchmark financing and reconcile the intercompany ledger from your own data. Book a short walkthrough and we will show the workflow on a scenario that matches your group structure, rather than a generic demo dataset.