Key Takeaways
- A DTA determines which country may tax a particular type of income and at what rate, directly affecting the entity's current and deferred tax balances.
- Withholding tax rates on dividends, interest, royalties, and capital gains are often reduced from domestic rates of 15%–30% to treaty rates of 0%–15%.
- Failing to apply an available treaty benefit overstates the tax provision; failing to verify treaty eligibility understates it.
- Treaty relief must be claimed actively by the entity through the correct forms and within the filing deadlines set by the source state.
What is a double taxation agreement?
We have seen the same error on about half the cross-border group audits we review: the tax provision applies the domestic withholding rate on intercompany dividends or royalties without checking whether a DTA or EU Directive reduces it. On a EUR 5M royalty payment subject to 25% domestic withholding, the difference between the domestic rate and a 10% treaty rate is EUR 750,000 of overstated tax expense. That is not a rounding difference. It is a line item that changes the effective tax rate reconciliation and invites questions from anyone reading the IAS 12.81 (c) disclosure.
A DTA is a bilateral treaty that assigns taxing rights between two contracting states by income type. Articles 6 through 21 of the OECD Model allocate categories (business profits, dividends, interest, royalties, capital gains, and employment income) to the source state, the residence state, or both with a capped rate. Article 23 obliges the residence state to eliminate double taxation by granting a credit or exemption for tax paid in the source state. For groups with subsidiaries across multiple jurisdictions, each treaty applies independently.
For the auditor, the treaty's impact shows up in current tax and deferred tax at the same time. On the current tax side, the entity applies reduced withholding rates on inbound payments and claims credits on outbound income. IAS 12.46 requires measurement at enacted rates, which includes treaty rates when the entity qualifies. On the deferred tax side, IAS 12.58 requires recognition of deferred tax on undistributed subsidiary profits unless the parent controls the timing and reversal is not foreseeable. The treaty rate on future dividend distributions (not the domestic withholding rate) determines the measurement. Both feed into the effective tax rate reconciliation under IAS 12.81 (c), which must explain why the effective rate differs from the statutory rate.
Worked example: Groupe Lefevre S.A.
Client: Belgian holding company, FY2025, revenue EUR 185M, IFRS reporter. Groupe Lefevre holds a 100% subsidiary in Portugal (Lefevre Ibérica Lda.) that distributes EUR 2M in dividends to the Belgian parent. Portugal's domestic withholding rate on outbound dividends is 25%. The Belgium-Portugal DTA reduces this to 15%. The EU Parent-Subsidiary Directive eliminates withholding entirely for qualifying EU parent-subsidiary pairs with a minimum 10% holding maintained for one year.
Step 1: determine treaty eligibility
Groupe Lefevre holds 100% of Lefevre Ibérica and has held the participation since 2019, exceeding the 10% threshold under both the DTA and the Parent-Subsidiary Directive. The Belgian parent holds a valid certificate of residence.
For the WP, record the percentage held, the holding period, the certificate of residence, and the qualification basis. Cross-reference to the intercompany ownership chart.
Step 2: determine the applicable rate
Because both Belgium and Portugal are EU member states and the holding meets the Directive's conditions, the withholding tax rate on the EUR 2M dividend is 0%, not the DTA rate of 15% or the domestic rate of 25%. The Directive takes precedence over the bilateral treaty when it produces a more favourable result.
For the WP, record the applicable rates (domestic 25%, DTA 15%, Directive 0%) with the basis for selecting 0%, the qualifying conditions met, the holding period evidence, and any ATAD anti-abuse provisions that could override the exemption.
Step 3: measure the current tax impact
With 0% withholding, no Portuguese tax is deducted from the EUR 2M dividend. Belgium applies the participation exemption, which deducts 95% of dividend income from the taxable base. The taxable portion is EUR 100,000 (5% of EUR 2M), producing Belgian tax of approximately EUR 25,000 at the 25% corporate rate.
For the WP, record the current tax calculation for both jurisdictions. Cross-reference to the tax return workings and the IAS 12.81 (c) reconciliation.
Step 4: evaluate deferred tax on undistributed profits
Lefevre Ibérica has retained earnings of EUR 8M beyond the EUR 2M distributed. IAS 12.39 requires recognition of a deferred tax liability on undistributed subsidiary profits unless the parent controls the timing and reversal is not foreseeable. Groupe Lefevre's board resolution confirms no further distributions for the next two years, so no deferred tax is recognised on the EUR 8M.
For the WP, record the board resolution, the IAS 12.39 analysis, the undistributed profits amount, and the treaty rates that would apply if the exception were unavailable.
The zero Portuguese withholding on the EUR 2M dividend is defensible because the Parent-Subsidiary Directive applies and the Belgian participation exemption limits domestic tax to EUR 25,000. The IAS 12.39 exception on the remaining EUR 8M of undistributed profits rests on a board resolution confirming no further distributions. Without that board resolution, the file should tell a story about why the deferred tax liability is nil on EUR 8M of retained earnings sitting in a jurisdiction with a 25% domestic withholding rate.
Why it matters in practice
In our experience, DTA issues on group audits fall into two patterns that account for almost every review note we write on international tax.
- Teams apply the domestic withholding tax rate in the tax provision without checking whether a DTA or EU Directive reduces it. This is often a SALY problem: last year's workpaper used the domestic rate, nobody questioned it, and the same figure rolled forward. IAS 12.46 requires measurement at the rate that applies to the entity's specific circumstances, which means someone has to actually open the treaty and confirm the conditions are met.
- The IAS 12.39 exception for undistributed subsidiary profits is applied without documenting whether the parent genuinely controls the timing of reversal. ISA 540.13 (a) requires the auditor to evaluate the entity's assumptions. A bare assertion that “no distribution is planned” without a board resolution does not meet the evidentiary standard when the treaty rate would produce a material deferred tax liability if distributions resumed.
It is genuinely frustrating to see a tax provision with a clean tick on every line and then find that the withholding rate is wrong by 15 percentage points because nobody checked the treaty. That kind of error is embarrassing when an inspector catches it, and it is entirely preventable.
Double taxation agreement vs. transfer pricing
| Dimension | Double taxation agreement | Transfer pricing |
|---|---|---|
| Purpose | Allocates taxing rights between two countries and eliminates or reduces double taxation | Sets the arm's length price for transactions between related entities within the same group |
| Governing framework | OECD Model Tax Convention, bilateral treaties, EU Directives | OECD Transfer Pricing Guidelines, local tax legislation, IFRIC 23 |
| What it affects | Withholding tax rates and exemptions on cross-border income | The profit split between group entities and the resulting taxable income in each jurisdiction |
| Audit risk | Applying the wrong rate (domestic instead of treaty) or failing to meet eligibility conditions | Intercompany prices outside the arm's length range, triggering adjustments and uncertain tax positions |
| Overlap point | Article 9 (associated enterprises) cross-references the arm's length principle and allows corresponding adjustments | The mutual agreement procedure under the DTA resolves double taxation from transfer pricing adjustments |
In short, the DTA allocates taxing rights by income category, while transfer pricing determines how much profit sits in each jurisdiction before those rights apply. When a transfer pricing adjustment in one country increases taxable income without a corresponding decrease in the other, Article 25 of the DTA (the mutual agreement procedure) resolves the resulting double taxation.
Related terms
Related tools
Related reading
Frequently asked questions
How do I verify that a client qualifies for treaty benefits?
Confirm that the entity is a tax resident of one contracting state (evidenced by a certificate of residence), the income type falls within a treaty article that provides relief, no anti-abuse rule (such as a principal purpose test under BEPS Action 6) denies the benefit, and the required forms have been filed with the source state within the deadline. IAS 12.46 requires the entity to apply the rate that reflects its actual eligibility.
Does a double taxation agreement affect deferred tax on subsidiary profits?
Yes. IAS 12.58 requires the entity to measure deferred tax on undistributed profits at the rate that will apply when those profits are distributed. If a DTA or EU Directive reduces the withholding rate on future dividends, the deferred tax liability reflects the treaty or Directive rate, not the domestic rate. This difference is material for holding companies with subsidiaries in high-withholding jurisdictions.
What happens when two treaties or directives overlap?
The entity applies the most favourable provision available. Within the EU, the Parent-Subsidiary Directive and the Interest and Royalties Directive often eliminate withholding tax entirely, overriding the bilateral DTA rate. Outside the EU, the bilateral DTA is typically the sole source of relief. IAS 12.46 requires measurement at the rate that will actually apply, so the entity must determine which instrument governs each income stream.