Dues & Collection

How Is Interest on Dues Debt Calculated? 5% Monthly

How is the interest added to accumulated dues calculated? What does "5% monthly" mean, and on what amount does it run? We explain the interest on dues debt with an example.

How Is Interest on Dues Debt Calculated? 5% Monthly — cover image
Apt Yönet 07 Eki 2026 4 min 26

Interest (late payment penalty) is added over time to the debt of a unit owner who delays paying their dues. So how exactly is this interest calculated, what does "5% monthly" mean, and on what amount does it run? In this guide we explain how interest on dues debt is calculated, with an example, under Article 20 of the Condominium Ownership Law No. 634 (KMK).

What is dues debt interest (late payment penalty)?

The interest added to dues debt is called "late payment penalty" in the law. A unit owner who does not pay their expense or advance share on time pays a late payment penalty at the rate of five per cent (5%) per month for the days delayed (KMK Art. 20). Unpaid dues therefore come back with a cost that increases by about 5% every month.

What does 5% monthly mean?

5% monthly means that 5% of the unpaid debt amount will be added as a late payment penalty for each month. This rate is fixed by law and cannot be changed through the management plan. For example, when a certain unpaid dues bill is one month late, approximately 5% of that amount accrues as penalty; when it is two months late, this grows cumulatively.

How is the interest calculated? (Example logic)

The basic logic of the calculation is: Late payment penalty = Unpaid amount × 5% monthly × delayed period. Step by step:

  • First, the unpaid (overdue) dues amount is determined.
  • The 5% monthly rate is applied on this amount.
  • The delayed period (how many months/days) is factored in.
  • Each dues item must be calculated separately from its own due date.

An important point: because each month's dues has its own due date, the penalty starts, for each item, from the due date of that item. When there is a debt for more than one month, the calculation is therefore done separately for each month.

When does the interest start?

For the late payment penalty to run, the unit owner must know the amount to be paid and the due date. When the due date set by the operating budget or the assembly decision arrives and payment is not made, the penalty starts to run from that date. It is therefore important, as a basis for the interest claim, that dues accruals and due dates be regularly notified.

Why is manual calculation difficult?

Calculating dues interest manually carries a high risk of error. Different due dates, partial payments and accumulated months make the calculation complex. For example, when an owner does not pay for several months and then makes a partial payment, questions arise such as whether this payment should be counted first against interest or against principal. Such situations require the calculation to be made with a consistent method.

Collection together with the interest

The late payment penalty is collected together with the principal debt. If payment is not made, the manager can initiate enforcement proceedings covering both the principal dues and the late payment penalty. In these proceedings, the operating budget or the assembly decision can be used as the basis of the claim. Correctly calculated interest is important for the sound progression of the proceedings.

Summary

Interest on dues debt is called late payment penalty in the law and is calculated at a fixed 5% monthly rate. The calculation is made on the unpaid amount in proportion to the delayed period, and each dues item starts from its own due date. For the interest to run, the debt and the due date must be known. Because manual calculation carries a risk of error, a consistent method is essential.

Calculating dues interest correctly for each item is difficult by hand. Apt Yönet automatically and consistently calculates the late payment penalty for each overdue debt, offering the management accurate collection.

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Frequently Asked Questions

What is the rate of interest on dues?

5% monthly. This rate is fixed by law and cannot be changed by the management plan (KMK Art. 20).

On what amount is the interest calculated?

It is calculated on the unpaid (overdue) dues amount, according to the delayed period.

How is it calculated when there is debt for more than one month?

Each month's dues is calculated separately from its own due date; the penalty runs item by item.

When does the interest start?

When the set due date arrives and payment is not made, provided the debt is known, the interest starts from that date.

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This content is for general information only and does not constitute legal advice. You are advised to consult a legal expert about your specific situation.

Prepared by the Apt Yönet expert team

The content is prepared by the Apt Yönet team, drawing on 8 years of hands-on experience in apartment and residential-complex management, in line with current legislation and Court of Cassation rulings.

Published: Category: Dues & Collection
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