In corporate groups, centralized cash management is a major lever for financial optimization. Intra-group agreements enable the organization of financial flows between related entities. Cash management agreements between sister companies meet specific needs for pooling financial resources within a single economic unit.

You need to understand the legal and tax implications of these agreements to secure your practices. The tax authorities carefully examine the compliance of these agreements with the arm’s length principle.

What is a cash flow agreement between sister companies?

A treasury agreement between sister companies is a contractual agreement organizing cash advances and loans between companies owned by the same parent company. These companies, known as “sister companies”, do not hold shares in each other, but belong to the same group.

This agreement differs from conventional loans in that it is intra-group in nature and designed to optimize cash management. It falls within the broader framework of corporate group taxation, and requires particular attention to documentation.

Unlike management fee agreements, which organize the provision of services, cash management agreements deal exclusively with financial flows. It enables a company with surplus cash to finance the temporary needs of a sister company.

Features and mechanisms of the Convention

The mechanism is based on cash advances granted by one sister company to another. These advances may be one-off or form part of a permanent cash pooling arrangement at group level.

Remuneration of flows is an essential element of the agreement. You need to provide for an interest rate in line with market conditions, generally based on a benchmark index (Euribor, €STR – Euro Short-Term Rate, or bank base rate) plus a margin reflecting the credit risk, to avoid any tax recharacterization. This rate must take into account several parameters: the duration of the advances, the borrower’s implicit credit rating, the group’s financing costs and current economic conditions.

Various recognized methodologies can be used to determine the rate. The comparable open market price approach (UPC method, in line with OECD transfer pricing principles) involves identifying the terms and conditions that the borrowing company would obtain from a third-party bank. You can also use the Group’s weighted average cost of capital (WACC) or marginal cost of debt as a reference. In practice, an indicative range is generally between 3-month Euribor plus a margin of 1% and 3%, depending on the risk profile of the borrowing company.

Practical details generally include :

• Setting authorized advance ceilings
• Conditions for making funds available
• Interest calculation and payment terms
• Maximum advance periods
• Possible warranties

Transaction traceability is essential. You need to document every cash movement with precision, to justify the reality and conformity of flows under arm’s length conditions.

Legal framework and formalism

The applicable legal formalities depend on the corporate form of the entities concerned. For joint-stock companies, the agreement is governed by the rules governing regulated agreements (Articles L225-38 et seq. of the French Commercial Code) if a manager or shareholder holding more than 10% of the capital is common to both sister companies. For SARLs, articles L223-19 et seq. of the Commercial Code apply when the agreement concerns a manager or partner holding more than 10% of the shares.

In this case, you must comply with a specific approval procedure. The agreement must first be authorized by the Board of Directors or the Supervisory Board for joint-stock companies, or by the partners for limited liability companies. It must then be approved by the Annual General Meeting, after presentation of a special report by the statutory auditor.

The contractual documentation must specify :

• The identity of the contracting parties
• The precise purpose of the agreement
• Detailed financial conditions
• Duration and cancellation conditions
• Dispute settlement procedures

Failure to comply with these formalities may result in the agreement being declared null and void if it is prejudicial to the company, and in the civil and criminal liability of the directors (Articles L242-6 and L242-9 of the French Commercial Code), as well as tax penalties if the agreement is deemed to constitute an abnormal act of management. Criminal penalties can include fines of up to 375,000 euros and 5 years’ imprisonment for certain serious offences.

Even when the agreement does not fall within the scope of regulated agreements (free agreements between sister companies without a common director or shareholder holding more than 10%), it is still subject to the obligation to declare it to the statutory auditor. Rigor in drawing up and monitoring these agreements is therefore an absolute necessity.

Tax implications of the Cash Flow Agreement

The tax authorities examine the compliance of cash management agreements with the arm’s length principle enshrined in article 57 of the French General Tax Code (CGI). You must demonstrate that the conditions applied correspond to those that would have been agreed between independent companies.

The main tax risk lies in the classification of the agreement as anabnormal act of management. This requalification occurs when the terms of the agreement deviate significantly from market conditions, particularly as regards the interest rate applied.

If the interest rate is lower than the market rate, the lending company is liable for the difference between the interest that should have been charged and the interest actually charged, under article 57 of the General Tax Code. Conversely, an excessive interest rate may be challenged by the borrowing company, limiting the deductibility of financial charges under article 212 of the CGI. In addition, Article 212 bis limits the deductibility of net financial expenses in excess of €3 million to 30% of tax EBITDA.

Another criterion for vigilance is the undercapitalization ratio. When a company’s indebtedness to affiliated companies exceeds 1.5 times its shareholders’ equity, the tax authorities may question the deductibility of interest corresponding to the excess fraction, unless the company can demonstrate that this ratio is justified by its economic situation.

The consequences of requalification include :

• Reintegrating amounts considered abnormal into taxable income
• Late payment surcharges and interest
• The risk of classification as a distribution of hidden profits
• Possible application of penalties for deliberate failure to comply

In order for the interest paid by the borrowing company to be deductible, the loan must also be in the interest of the company’s operations. You must be able to prove that the funds were actually used in the company’s business.

In terms of documentation, cash agreements between sister companies are subject to transfer pricing obligations. Depending on the applicable thresholds, you are required to draw up simplified or full documentation justifying compliance with the arm’s length principle. A country-by-country declaration is required if consolidated sales exceed €750 million, while full documentation is required for groups with sales or gross assets in excess of €400 million. To further secure your practices, you can request an Advance Pricing Agreement (APA) from the tax authorities, enabling you to validate the terms of your cash flow agreements in advance.

Safety and Good Practices

To secure a cash flow agreement between sister companies, it is essential to provide exhaustive documentation. You need to put together a supporting file including the economic analysis that led to the setting up of the agreement.

Determining the interest rate requires in-depth market research. You can refer to interbank rates, banking conditions applicable to group companies, or carry out a comparative analysis with similar transactions.

Best practices include :

• Systematically formalize the agreement in writing prior to any operation
• Regular updating of financial conditions in line with market trends
• Detailed sub-ledger accounting of cash flows
• Keeping all receipts for interest payments and deposits
• Annual review of agreement compliance

The use of external expertise may prove useful in validating the tax compliance of your agreements. A tax lawyer can help you structure, document and defend your intra-group agreements with the tax authorities.

The implementation of rigorous monitoring and appropriate governance will enable you to benefit fully from the advantages of cash pooling, while controlling the associated legal and tax risks.