When collecting a monetary claim, it is often not only the principal that is at stake but also the interest that compensates for the loss of value the money suffers over time. Where the parties have not fixed an interest rate in the contract, statutory interest (legal interest) comes into play. Statutory interest is a safe floor to which the creditor may resort of their own accord; however, how its rate is determined, from which date it runs, and whether it applies in an ordinary or a commercial relationship directly affect the amount that may be claimed. This article addresses, for information purposes, the legal basis of statutory interest, the logic of its calculation, and the points to bear in mind.
What Is Statutory Interest?
Statutory interest is interest that runs at the rate prescribed by law even where no interest rate has been agreed between the parties in a monetary debt. In other words, if there is a gap in the contract as regards interest, statutory interest fills that gap. In this respect statutory interest functions as a minimum standard protecting the creditor: even where they have not separately agreed on a rate, the creditor may claim interest at least at the statutory rate for the period during which they were deprived of their money.
Statutory interest arises in two distinct situations. The first is interest that runs in return for the use of money before the debt has even fallen due. The second, and by far the more common in practice, is statutory default interest that runs where the debtor is late in paying, that is, in the case of default. In most claim actions and enforcement proceedings, the interest sought is statutory interest relating to this default period.
Legal Basis
In Turkish law, the basic regulation on interest is contained in Law No. 3095 on Legal Interest and Default Interest. This law sets out the principles of the legal interest to be applied where no rate has been agreed in the contract, and of the default interest to be run in the event of default. In addition to this:
- The Turkish Code of Obligations contains the general provisions on default, the time of performance and claims for interest.
- The Turkish Commercial Code lays down special rules as to the interest to be applied in commercial matters where the parties are merchants.
The statutory interest rate is not a fixed figure; it is updated from time to time by the competent authorities according to economic conditions. For this reason, the rate to be applied to a claim may vary according to the period over which the interest runs. At the heart of a correct calculation lies the principle of "taking as a basis the rate in force during each period in which the interest runs".
The Difference Between Statutory Interest and Contractual Interest
One of the matters most often confused in practice is the distinction between statutory interest and contractual (agreed) interest.
- Contractual (agreed) interest: Where the parties have expressly agreed on a rate, that rate applies. For example, the interest fixed in a loan agreement is contractual interest.
- Statutory interest: Where the parties have not agreed on any rate, the rate prescribed by law comes into play. If there is no rate in the contract, statutory interest fills the gap.
Another important distinction is that between an ordinary matter and a commercial matter. In relationships where both parties are merchants and which bear a commercial character, the advance (rediscount) interest rate announced by the Central Bank may be applied as regards default interest, and this rate is often higher than the statutory rate in ordinary matters. For this reason, correctly determining whether a claim is ordinary or commercial determines the rate to be applied and hence the total amount of interest.
How Is Statutory Interest Calculated on Claims?
The calculation of statutory interest rests on three basic variables: the principal, the annual rate to be applied and the period over which the interest runs. On the logic of simple (ordinary) interest, the basic formula is as follows:
Amount of interest = Principal × Annual rate × (Number of days / 365)
The critical points here may be summarised as follows:
- Start date: Statutory default interest runs from the date on which the debtor fell into default. That date is most often the due date of the debt, the date of the notice served by the creditor, or the date of the lawsuit/enforcement proceedings.
- End date: As a rule, interest continues to run until the day the debt is actually paid. In the calculation, the date of payment or of the calculation is taken as the end date.
- Periodic changes in the rate: If the interest rate has changed over the period in which it runs, the rate in force during that period is applied separately for each period and the results are added together. Applying a single current rate to the whole period produces an incorrect result.
- Limit on compound interest: As a rule, running interest again on accrued interest (compound interest) is restricted; strict rules apply on this point, especially in ordinary matters.
The tool on this page produces an approximate result based on the principal, rate and date range you enter. The exact amount, however, may vary according to whether the matter is ordinary or commercial, the period rates, and the start date of the interest.
A Short Example Scenario
Suppose you have a claim of 50,000 TL and the debtor did not pay on the agreed due date. In a debt with a fixed due date, the debtor may be deemed to have fallen into default when the due date arrives. For the period running from that date until the day payment is made, interest is run at the statutory default interest rate in force for that period. If the rate has changed once during the period in which the interest runs, a separate calculation is made for two distinct periods and the amounts are added together. This method differs from applying a single average rate to the whole period and is the legally correct approach.
Points to Watch Out For
Although a claim for statutory interest establishes a floor in the creditor's favour, a few points must be observed in order to reach a sound result:
- Interest must have been claimed: Interest must be expressly requested in the statement of claim or in the enforcement request. The start date and the type of interest should also be stated as clearly as possible.
- Choosing the correct rate: Settling for the ordinary rate on a commercial claim where commercial default interest could have been claimed may lead to a serious loss of rights.
- Limitation: Interest claims may be subject to their own limitation periods, independently of the principal claim. Limitation may become an issue for interest that has not been claimed for a long time.
- Documentation: Documents showing the due, notice and payment dates are important for proving the start and end of the interest.
Common Mistakes in Calculating Statutory Interest
- Wrong start date: Whether the interest is to run from the date of the contract, the due date, the notice or the date of the lawsuit is frequently confused. A wrong date may lead to under-collection or to rejection of the claim.
- Overlooking the ordinary/commercial distinction: Applying the statutory (ordinary) interest rate to a commercial claim may cause the creditor to suffer a significant loss of rights.
- Disregarding rate changes: In long-term claims, failing to apply separately the rates that change over the period is among the most common mistakes.
- Assuming a single uniform interest: Applying the same interest to the entire claim from start to finish, without distinguishing the pre-maturity period from the delay period, leads to an incorrect total amount.
- Forgetting to claim interest: If interest is not expressly claimed in the lawsuit or enforcement proceedings, the interest amount to which one is entitled may not be obtained.
Calculating statutory interest requires a legal assessment as much as a technical one. The nature of the claim, the determination of the moment of default, the period rates to be applied and the relevant provisions of the law determine the outcome. Automated tools give a quick preliminary idea; however, especially for high-value or long-term claims, an assessment by a lawyer before filing a lawsuit or enforcement proceedings helps to prevent possible losses of rights. This content is for general information purposes and does not constitute a definitive legal outcome or a guarantee in relation to the specific case.