Interest (adat) calculation

Calculate accrual interest based on the fictional principal amount, interest rate, and number of days. You can set the year-day count to 365 or 360, and quickly view the calculated interest and VAT amounts.

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Tarihler gg/aa/yyyy. Gün sayısı dahil.

TarihTutarGünlük azami bakiyeFiktif tutarGünHesaplanan faiz

Faiz; fiktif tutar, yıllık oran, gün sayısı ve 365/360 esas alınır. KDV sabit %20. Toplam faiz, satırdaki gün kolonunun toplamı değil, her işlemin devir tarihine göre günüdür.

Important

This tool is for information only and produces approximate results based on generally accepted calculation logic. It does not replace professional assessment of a specific case; the final calculation should be made by an authorised professional.

What Is Interest (Adat) Calculation?

Interest (adat) calculation is a method for calculating interest on a day-by-day basis on the balance that builds up over a given period. It is used in particular for periodic interest calculations on balances such as shareholder current accounts, cash transactions and similar balances in businesses.

The calculation takes the balance, interest rate, number of days and days in the year (365 or 360) into account to determine the interest for the period.

How Is Adat Interest Calculated?

In an interest (adat) calculation, the balance arising in the relevant period is considered first. The part of the balance exceeding the set maximum amount is treated as a notional amount, and interest is calculated on this amount.

General calculation steps:

  • The start (carry-forward) date is set.

  • The interest rate is entered.

  • The maximum amount is set.

  • Transaction dates and amounts are added.

  • The number of days is calculated for each transaction.

  • Interest is calculated on the notional amount.

  • Total interest, VAT and the total invoice amount are generated automatically.

Interest (adat) calculation formula

The basic calculation used for adat interest is as follows:

Notional Amount × Interest Rate × Number of Days / (Days in Year × 100)

Depending on practice, 365 or 360 can be used as the number of days in the year.

Points to Note in Interest (Adat) Calculation

To get an accurate result:

  • The start/carry-forward date must be selected correctly.

  • Transaction dates must be entered correctly.

  • The interest rate should be set using the current rate.

  • The maximum amount must be defined correctly.

  • The days-in-year choice (365 or 360) should match the calculation method used.

This information directly affects the calculated interest amount.

What Is the Interest (Adat) Calculator For?

The interest (adat) calculator lets you calculate interest per transaction, determine the notional amount automatically, calculate the total interest, generate the VAT amount and view the total invoice amount quickly on a single screen.

It removes the need for manual calculation, especially for accounts with many transactions, helping you manage the process more quickly and practically.

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See this period before filing.

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© 2026 Üstad Teknoloji A.Ş. Tüm hakları saklıdır.

A digital colleague for accountants that digitises client processes and provides pre-filing checks and analysis.

Weekdays 09:00–18:00

0 (216) 706 76 00

destek@ustad.co

Newsletter

Stay up to date with what's new. You can find out how your personal data is processed in the Privacy Notice.

Üstad Report is a pre-check and decision support tool for professionals and businesses; it is not an accountancy service under Law No. 3568. The reports produced are drafts and cannot be used as the basis for a tax return until reviewed and approved by an authorised professional (SMMM/YMM).

Üstad Teknoloji A.Ş. · Barbaros Mah. Şebboy Sk. No:4/1 İç Kapı No:2 Ataşehir/İstanbul · Kozyatağı Tax Office 4781033938 · MERSİS 0478-1033-9380-0001

KEP ustadteknoloji@hs01.kep.tr

© 2026 Üstad Teknoloji A.Ş. Tüm hakları saklıdır.

A digital colleague for accountants that digitises client processes and provides pre-filing checks and analysis.

Weekdays 09:00–18:00

0 (216) 706 76 00

destek@ustad.co

Newsletter

Stay up to date with what's new. You can find out how your personal data is processed in the Privacy Notice.

Üstad is a technology platform for accountants; it does not provide accounting services. Report outputs are drafts; they cannot be used as the basis for a tax return until reviewed and approved by an authorised professional (SMMM/YMM).

Üstad Teknoloji A.Ş. · Barbaros Mah. Şebboy Sk. No:4/1 İç Kapı No:2 Ataşehir/İstanbul · Kozyatağı Tax Office 4781033938 · MERSİS 0478-1033-9380-0001

KEP ustadteknoloji@hs01.kep.tr

© 2026 Üstad Teknoloji A.Ş. Tüm hakları saklıdır.