On 29 and 30 January 2026, the Swiss Federal Tax Administration (SFTA) published the new circulars on the tax-deductible interest rates for intra-group advances and loans in Swiss francs as well as in foreign currencies. [1] As in previous years, the overall principles remain unchanged; however, the SFTA has adjusted the interest rates in specific areas.
For advances to shareholders or related parties, the SFTA interest circulars distinguish between equity- and debt-financed loans, as well as between loans in Swiss francs and foreign currencies.
The minimum required margin for debt-financed CHF loans is 0.5% (for loans below CHF 10 million) or 0.25% (for loans exceeding CHF 10 million). For loans in foreign currencies, a margin of at least 0.5% must be maintained; however, the interest rate must not fall below the level specified in the circular for the currency at hand.
The updated interest rate circulars lead to the following changes compared to the previous year:
Different maximum interest rates apply depending on the type of loan from shareholders or related parties. For loans in Swiss francs, the following interest rates apply:
For operating loans in foreign currencies, the same spread can be applied as in the SFTA circular on tax-deductible interest rates for advances or loans in Swiss francs (up to an equivalent of CHF 1 million: 2.75% and 2.25%, respectively; above an equivalent of CHF 1 million: 0.75% and 0.50%, respectively).
The spread refers to the difference between the maximum permissible interest rate in Swiss francs for the respective loan and the minimum required margin for loans to shareholders or related parties. The sum of the defined foreign currency interest rate and the spread results in the following maximum interest rates for advances from shareholders or related parties:
In the context of interest on intra-group loans under Swiss tax law, the SFTA interest circulars can be used as a «safe haven». Companies operating within these ranges can generally assume that the tax authorities will consider it commercially justified and therefore accept it. However, a taxpayer is not bound to the published interest rates and may deviate from them if needed, whereby it must be proven that the interest rate applied is consistent with the arm's length principle. In this regard, the Federal Supreme Court issued a controversial ruling in summer 2024, stating that the SFTA «safe haven» interest rates no longer apply if a taxpayer deviates from these rates and bases their calculations on the arm’s length principle. In such cases, the tax authorities are to apply a lower or higher interest rate, provided it complies with the arm’s length principle [2] , with the burden of proof resting on the tax authority. Whether this ruling of the Federal Supreme Court will be strictly applied in practice remains to be seen. It is expected that the tax authorities will only undertake the effort to determine the “actual” arm’s length interest rate in particularly significant cases and will in general continue to rely on the «safe haven» rates as a correction measure.
As mentioned, it is possible to deviate from the interest rates published in the interest rate circulars, provided that the interest rate complies with the arm's length principle. It is recommended that compliance with the arm's length principle be properly documented. In this context, it should be noted that an offer from banks or other financial institutions is generally not sufficient.
If the agreed interest rates deviate from the published rates and are not at arm’s length, the exceeding part qualifies as a deemed dividend. For the paying company a deemed dividend will lead to an adjustment for corporate income tax purposes (partially negating deductibility of paid interest). In addition, the company owes the withholding tax of 35% on the deemed dividend. Withholding tax must be passed on to the beneficial owner of the dividend retroactively. Failure to do so can lead to a so-called hundred-percent adjustment, which may result in a withholding tax of approximately 54%. In the case of a deemed dividend, the withholding tax can regularly constitute a definitive charge if reimbursement is partially or fully denied.
In light of the adjusted interest rates, taxpayers should generally review loans between related parties and, in particular, in intra-group loan relationships. This applies not only to new financing arrangements but also to ongoing loans. If the loan agreements are already structured in a way that the applicable interest rate is based on the ‘safe haven’ rates, the interest payments should be adjusted accordingly. If the interest rate according to the loan agreement is not linked to the SFTA rates, a contractual adjustment of the rates should be considered or – without adjustment – evidence that the rate deviating from the SFTA rates complies with the arm’s length principle should be prepared.
Especially in the case of cross-border financing, larger credit volumes, or loans in foreign currencies, a detailed analysis is advisable to avoid negative tax impact, in particular in the form of deemed dividends with corporate income tax and withholding tax consequences.
The 2026 interest circulars, as expected, do not change the general principles. Companies using the ‘safe haven’ rates continue to benefit from administrative simplification. Those who deviate from the published rates or maintain complex financing structures should carefully review and document the appropriateness of the interest rates.
[1] The circular letters regarding the interest rates recognized for tax purposes are available at this LINK .
[2] Please also see our blog post dated August 23, 2024.
In its ruling 9C_690/2022 of July 17, 2024, a five-judge panel of the Swiss Federal Supreme Court ruled on the binding effect of the "safe harbour" interest rates published annually by the Swiss Federal Tax Administration ("SFTA"). According to the Supreme Court, the tax authorities are not bound by the published interest rates if interest rates agreed between associated companies are below or above the published minimum or maximum rates. In this case, according to the Federal Supreme Court, the tax authorities must instead determine the "actual" arm's length interest rate.
The appellant company (A. AG), a subsidiary of a corporation incorporated based on federal law (B. AG), is subject to limited tax liability in the Canton of Zurich on the basis of permanent establishments. [1] In 2013, A. AG entered into a credit facility agreement with its parent company with a maximum credit limit of CHF 1 billion. On the basis of this agreement, the two companies agreed on a fixed term loan (61 months) of CHF 500 million at an interest rate of 2.5% per annum. For the difference between the credit limit and the fixed loan, a current account was agreed at an interest rate of 3% per annum.
The Cantonal Tax Administration of Zurich ("TA ZH") took the view that the agreed interest rates were not at arm's length, in particular because the existing government guarantee of the parent company had not been taken into account when determining the disputed interest rates. The TA ZH subsequently claimed deemed dividends for the 2014 and 2015 tax periods. The deemed dividends were initially calculated on the basis of an interest rate of 1% per annum, which was determined at the discretion of TA ZH. A. AG's objection to this was partially upheld by the tax administration and the at arm's length interest rate was set at 1.08%. The TA ZH calculated the rate of 1.08% on the basis of the average interest rate for the refinancing of B. AG with bonds of 0.83% and added a margin of 0.25%. This approach was confirmed by the Tax Appeal Court of the Canton of Zurich in its decision of March 10, 2002.
The Administrative Court of the Canton of Zurich partially upheld the appeal against the ruling of the Tax Appeals Court and referred the case back to the lower court for recalculation and a new ruling in line with the considerations. In essence, the Administrative Court was of the opinion that the interest rates published annually by the SFTA should be adhered to and that these rates define the arm’s length range of applicable interest rates. A correction of a not at arm’s length interest rate was therefore only possible to the amount of the published minimum or maximum interest rates. The TA ZH appealed against this ruling to the Federal Supreme Court, which rejected the position of the Administrative Court and upheld the opinion of the TA ZH.
On the merits of the case, the Federal Supreme Court addressed the objection raised by TA ZH that the interest rate circulars published by the SFTA are not applicable to state and cantonal income taxes and are only binding for the purposes of federal income tax and withholding tax. In this respect, the Federal Court recalled that the income tax rules are harmonised between the federal and cantonal levels, which means that the SFTA interest rates are also applicable to federal and cantonal income taxes.[2]
With regard to the nature of the SFTA circulars on permissible interest rates, the Federal Supreme Court first stated that they serve to simplify the application of the arm's length principle. The simplification lies in the fact that the published interest rates, as "safe harbour rules", justify the assumption that there is no deemed dividend if the taxpayer complies with these rules. [3] Conversely, or if the taxpayer deviates from the published rates, there is a rebuttable presumption of a deemed dividend. In this case, it is up to the taxpayer to prove that the interest payments are in fact at arms' length. In addition, the Federal Supreme Court stated that the interest rate circulars of the SFTA should only be deviated from if the applicable legal provisions are not convincingly specified. [4]
With regard to the case at hand, the Federal Supreme Court stated that the binding effect of the interest rate circulars only exists as long as the taxpayer itself adheres to the interest rates defined therein. If the taxpayer deviates from these rates, there is no reason why the tax authority should continue to be bound by the safe harbour rules and not be allowed to determine the actual arm's length interest rate. [5] In these cases, there is neither a violation of the protection of legitimate expectations nor of the principle of equal treatment, especially since the taxpayer itself has deviated from the SFTA interest rates. Finally, the deviation from these interest rates would also undermine the purpose of the safe harbour rules, i.e. administrative simplification, as the tax authorities would have to check in these cases whether the interest rate claimed was in line with the arm's length principle. [6] Against this background, the Federal Court did not see any violation of the law in the TA ZH's determination of what it considered to be the arm's length interest rate, which deviated from the FTA interest rates.
However, with regard to the actual determination of the arm's length interest rate by the TA ZH, the Federal Supreme Court found that the Administrative Court of the Canton of Zurich had not addressed the issue of the legitimacy of taking into account a "margin" of 0.25% based on the interest rate circulars of the SFTA. In this respect, the Federal Supreme Court referred the matter back to the lower court for reconsideration.
The above-mentioned decision of the Federal Court raises several questions, both in terms of its reasoning and its possible consequences for practice, which will be addressed in the following.
To the extent that the Federal Court has denied a violation of the principle of equal treatment, one can agree with the court as long as it will be ensured that the tax authorities consistently apply the arm's length interest rate in all cases where a taxpayer deviates from the SFTA interest rates. In other words, the tax authorities should not be able to rely on the SFTA rates on a case-by-case basis as this would lead to unequal treatment of taxpayers who deviate from the SFTA rates. Similarly, the individual application of the effectively higher administrative costs by the tax authorities when assessing the participation exemption would also violate the principle of equal treatment – to the extent that this was actually intended by the legislator .[7] – gegen den Grundsatz der Gleichbehandlung.[8]
The Federal Court's argument that the purpose of the interest rate circulars in terms of administrative simplification can no longer be achieved if the taxpayer deviates from the maximum permissible interest rates is not entirely convincing, if at all. According to the case law of the Federal Supreme Court, the tax authorities can no longer limit themselves (while maintaining the principle of equal treatment) to examining the transfer pricing studies submitted as evidence of the arm's length principle, but must now - if they are of the opinion that the arm's length principle has not been verified - determine the effective market interest rate. It is true that the taxpayers' (attempted) proof of arm's length interest rates, as opposed to the SFTA interest rates, involves additional work for the tax authorities. However, this in itself only partially limits the purpose of administrative simplification. This purpose is only completely thwarted by the TA ZH's position, now confirmed by the Federal Court, that it is the tax authority's task to determine the specific market interest rate to be applied (and not merely a range of arm’s length interest rates). If it is indeed (only) a matter of administrative simplification, there is no obvious reason why the SFTA interest rates could no longer be used as a basis (for simplification reasons) if the arm's length interest rate cannot be proven. Instead, the tax authorities will have to determine the arm's length rate in accordance with best practice.
With regard to the requirements for the tax authorities to provide evidence of what they consider to be the arm's length interest rate, it seems reasonable to apply the same requirements for the evidence of the arm's length principle or the transfer pricing study as those defined in the SFTA applicable to taxpayers. The transfer pricing study to be carried out by the tax administration would therefore have to include the following elements, whereby the taxpayer's duty of cooperation could be invoked for the first two points[9]:
In terms of applicable transfer pricing methods, the Comparable Uncontrolled Price Method (CUP Method) is the primary transfer pricing method to be used for interest rates. In addition, the cost of funds method is also recognised in Swiss practice and appears to have been used by TA ZH in the present case. According to this method, the interest rate is determined on the basis of the lender's cost of funds plus a risk premium and a profit margin. The determination of the margin requires a case-by-case assessment, taking into account the borrower's credit rating. Against this background, the Federal Court's decision to refer the case back to the Administrative Court with regard to the 0.25% interest margin applied by TA ZH, which in turn is based on the SFTA's interest rate circular, is only consistent in the light of the other considerations.
Lastly, the statement by the Federal Court that it is the task of the tax authority to determine a specific interest rate to be applied and not (merely) a range of interest rates also raises questions. This statement cannot be reconciled with state-of-the-art transfer pricing methodology. The Federal Court fails to recognise that, in principle, only a range can be determined for the market interest rate or that it is unlikely that there is only one market interest rate for a specific transaction. [10] The principle applies that a correction to the actual terms agreed between related parties is only permitted at the upper or lower end of the identified arm’s length range. This principle has now been unnecessarily called into question by the Federal Supreme Court, at least as far as interest rates are concerned. It is also questionable to what extent the interest rates published by the SFTA correspond to the arm's length principle, if they cannot be used as a basis for determining deemed dividends. In this context, it should be noted that some tax administrations have taken the view that the range of arm's length interest rates is relatively narrow, meaning that a deviation of more than 25% from the SFTA interest rates is per se inconsistent with the arm's length principle and that the taxpayer is (effectively) denied the opportunity to provide rebuttal evidence. [11] This position can no longer be maintained if the case law of the Federal Court is consistently applied.
With regard to the specific facts of the present case, it can be said that the deviation of the TA ZH from the SFTA interest rates can be regarded as appropriate in individual cases. However, the reasoning chosen by the Federal Supreme Court to justify the deviation from the SFTA interest rates is not convincing and leads to unnecessary uncertainties. It would have been more appropriate to emphasise the special nature of the individual case at hand and thus follow a factual line of reasoning. In this respect, the Federal Supreme Court could have referred to the general rule that the interest rate circulars of the SFTA can (only) be deviated from if they do not convincingly specify the applicable legal provisions, which could certainly have been argued in the present case.
It would now be desirable for the SFTA to take the present decision of the Federal Court as an occasion to amend its interest rate circular and, in particular, to define more precisely the scope of application of the safe harbour rules. [12] This would increase legal certainty for taxpayers, and the expected additional workload for the tax authorities could be mitigated. In this context, it should be noted that the credit rating of the borrower and the specific structure of the financing are of considerable importance in determining an arm's length interest rate on a case-by-case basis. For example, the impact of collateral, maturity and prepayment rights (or lack thereof), as well as whether and how implicit group support or a group rating should be taken into account, must be assessed.
Since deviation from the SFTA's interest rate circulars has always led to a de facto obligation to provide evidence of the arm’s length of the interest rates used, it is still recommended - also in light of the discussed decision - that groups prepare a robust transfer pricing analysis and documentation.
Zurich, August 23, 2024
[1] For a more detailed description of the facts, see the ruling of the Administrative Court of the Canton of Zurich SB.2021.00056 of May 25,2022..
[2] Judgment FSC 9C_690/2022 of July 17, 2024, E. 6.1.
[3] Judgment FSC 9C_690/2022 of July 17, 2024, E. 4.1.
[4] Judgment FSC 9C_690/2022 of July 17, 2024, E. 4.2.
[5] Judgment FSC 9C_690/2022 of July 17, 2024, E. 6.2.
[6] Judgment FSC 9C_690/2022 of July 17, 2024 E. 6.2. in fine
[7] Cf. GRETER, Der Beteiligungsabzug im harmonisierten Gewinnsteuerrecht, Diss., Zurich 2000, p. 142.
[8] Cf. Attenhofer, in: Klöti-Weber/Schudel/Schwarb, Kommentar zum Aargauer Steuergesetz, 5th edition, Bern 2023, para 35 to § 27b; Vitali, ibid., para. 86 to § 76,
[9] See https://www.estv.admin.ch/estv/de/home/internationales-steuerrecht/verrechnungspreise.html, question 23.
[10] See https://www.estv.admin.ch/estv/de/home/internationales-steuerrecht/verrechnungspreise.html, question 32.
[11] See Harbeke/Hug/Scherrer, Verrechnungspreisrecht der Schweiz, Grundlagen und Praxis, Zürich, 2022, para. 1188.
[12] See also the criticism of the SFTA interest circulars in Harbeke/Hug/Scherrer, a.a.O., para. 1226.
