Loan Payment Guide: Monthly Payments, Interest Costs, and Repayment Schedule

When applying for a loan, consumers usually look first at the monthly payment. But understanding the true cost requires looking beyond monthly payments to the total interest cost, statutory taxes (KKDF and BSMV), and processing fees payable to the bank over the term.

Most personal bank loans use an equal-payment loan (annuity) model . In this model, monthly payments remain fixed throughout the term, while the principal and interest portions change each month.

HesapYap Loan Payment Calculator; simulates your monthly payment, total repayment, and total financing cost in seconds based on the loan amount, monthly interest rate, and chosen term.

1. How Is an Equal-Payment Loan (Annuity) Calculated?

For consumer loans and mortgages with fixed payments, financial mathematics uses the annuity formula :

\text{Aylık Taksit} = P \times \frac{r(1 + r)^n}{(1 + r)^n - 1}

$P$ (Principal): The amount borrowed.

$r$ (Monthly Gross Interest): The bank's contractual monthly interest rate (including taxes).

$n$ (Term): Total number of payments (months).

Key Detail: Net or Gross Interest?

For personal and vehicle loans, the bank's quoted nominal monthly interest is subject to 15% KKDF (Resource Utilization Support Fund levy) and 15% BSMV (Banking and Insurance Transactions Tax) for a total of 30% tax. The gross interest used to calculate payments (

r

r_{\text{brüt}} = \text{Aylık Nominal Faiz} \times 1{,}30

(For example, if monthly interest is 3.00%, the gross rate entered into the formula is 3.90%. Only housing loans are exempt from KKDF and BSMV, so their quoted rate is used directly).

2. Total Repayment and Interest Cost

Total Repayment: $\text{Aylık Taksit} \times \text{Vade (Ay Sayısı)}$

Total Interest Cost: $\text{Toplam Geri Ödeme} - \text{Kullanılan Kredi Anaparası}$

Example: If you repay a TRY 100,000 loan over 12 months with monthly payments of TRY 10,500:

Total Repayment: $10.500 \times 12 = \mathbf{126.000\text{ TL}}$

Total Financing Cost: $126.000 - 100.000 = \mathbf{26.000\text{ TL}}$ (Interest + KKDF + BSMV)

3. How the Repayment Schedule Works: What Changes Within Each Payment?

Although your payment stays the same each month, its composition changes substantially:

Early Months: Your outstanding principal is at its highest. Much of each monthly payment (for example, 60-70%) therefore goes toward accrued interest and taxes, with only a small reduction in principal.

Final Months: As principal falls, monthly interest decreases. Most of the same payment now goes directly toward clearing principal.

Extra Payment and Early Repayment Strategy: If you want to repay early or make an extra payment, doing so during the first third of the term provides the greatest interest savings. Near the end of a loan, most interest has already been paid, so early repayment saves less interest.

4. Monthly Nominal Interest Versus Annual Cost Rate (YMO)

The biggest mistake consumers make when comparing loans is looking only at the monthly interest rate.

Monthly Nominal Interest: Only the basic cost of borrowing money.

Annual Cost Rate (YMO / Effective Interest): The annual compound percentage obtained by adding all upfront and periodic costs to interest, including loan allocation fees, KKDF, BSMV and mandatory insurance in the calculation.

When choosing between banks, always prefer the offer with the lower YMO value.

5. Loan Allocation Fees and Legal Limits

Banks cannot deduct any processing fee they wish under the name of operating expenses:

Under the TCMB (Central Bank of the Republic of Türkiye) Finansal Tüketicilerden Alınacak Ücretlere İlişkin Tebliği (Communiqué on Fees Charged to Financial Consumers) , the loan allocation fee can be no more than five per thousand (0.5%) of the principal borrowed.

For example, TRY 200,000 borrowed as a personal loan is subject to a maximum allocation fee of TRY 1,000 (+BSMV) .

Documented payments to third parties, such as valuation and mortgage fees, are excluded from this cap.

6. Choosing a Term: Lower Payments or Less Interest?

Term Choice	Monthly Payment	Total Interest Cost	Who Is It Suitable For?
Short Term (12 Months)	High	Very Low	People with regular cash flow who want to repay quickly and pay less interest
Medium Term (24 Months)	Balanced	Medium	People seeking balanced payments without straining their monthly budget
Long Term (36 Months)	Lowest	Highest	People who want to minimize monthly payments and ease immediate budget pressure

Frequently Asked Questions

Is life insurance mandatory when taking out a loan? Under the Tüketicinin Korunması Hakkında Kanun (Law No. 6502 on Consumer Protection), banks must also offer an uninsured loan option. However, the interest rate on uninsured loans may generally be somewhat higher. Consumers also have the right to provide a cheaper policy with equivalent coverage from another insurer instead of the bank's agency.

Will I pay a penalty for repaying a personal loan early? No. Early repayment penalties or compensation are legally prohibited for consumer loans. Repaying early removes all interest and taxes for future months that have not yet fallen due. (Housing loans may carry statutory early repayment compensation capped at 1-2% of remaining principal).

Does my credit score affect the interest rate? Yes. Banks use risk-based pricing. Customers with high Findeks credit scores are offered lower rates, while higher-risk consumers may receive higher-rate offers or be asked for additional collateral/a guarantor.

Legal Basis and Sources

Tüketicinin Korunması Hakkında Kanun, Law No. 6502: Consumer rights relating to consumer loan and housing loan agreements.

Tüketici Kredisi Sözleşmeleri Yönetmeliği (Regulation on Consumer Loan Agreements): Pre-contract information forms, repayment schedules, and early repayment rules.

TCMB Finansal Tüketicilerden Alınacak Ücretlere İlişkin Tebliğ (2020/7): Loan allocation fee caps and cost restrictions.

Information: This content and calculator are intended for general financial simulation and information; they are not an official loan offer or financial advice. Final payments, insurance premiums, and loan approval conditions depend on your bank's individual assessment.

Loan Calculator: Monthly Payments and Repayment Schedule