Credit Card Extra Installment Calculator

Extend your installment purchase and calculate the new monthly payment and total interest amount.

Note: This calculation assumes an extra installment interest rate of 4.00%. Calculated interest is subject to 15% BSMV and 15% KKDF taxes.

Warning: This tool is for informational purposes only. Check with your bank for exact rates.

What is Credit Card Extra Installment? How to Calculate and When It Applies

Credit card extra installment allows you to extend an existing installment payment over a longer period through your bank. This option is usually available for unbilled transactions and can help reduce your monthly payment burden.

In This Guide:

  • What is an extra installment?

  • How to apply for it

  • How to calculate it

  • Applicable interest rates and taxes

💡 Want to calculate immediately? Use our Credit Card Extra Installment Calculator at the top of the page to find your new monthly installment and total interest in seconds!

What is an Extra Installment?

An extra installment is when a transaction already made in installments is rescheduled for a longer term before it appears on your credit card statement.

Example:

  • A purchase is originally 6 installments.

  • If the transaction is unbilled, the bank may allow it to be extended to 12 installments.

  • Result: Monthly payments decrease, but total interest increases.

How to Apply for Extra Installments

  1. Transaction must be unbilled: Extra installments cannot be applied to billed transactions.

  2. Valid for TL transactions only: Foreign currency transactions cannot be rescheduled.

  3. Application method: Request through your bank’s mobile app, online banking, or branch.

How to Calculate Extra Installments

Extra installments are usually calculated using the equal installment (annuity) formula:

Monthly Installment=K⋅r⋅(1+r)n(1+r)n−1\text{Monthly Installment} = \frac{K \cdot r \cdot (1+r)^n}{(1+r)^n – 1}

Where:

  • KK = Transaction amount

  • rr = Monthly interest rate

  • nn = New number of installments

Example Calculation:

  • Original installment amount: 5,000 TL

  • New installments: 12

  • Monthly interest: 4.00% / 12 ≈ 0.333%

Monthly Installment≈442.67TL\text{Monthly Installment} \approx 442.67 TL

⚠️ Note: Calculated interest is subject to 15% BSMV and 15% KKDF taxes.

Extra Installment Interest and Taxes

  • Interest Rate: Usually 4.00% (based on the Central Bank rate)

  • BSMV: 15% of the interest

  • KKDF: 15% of the interest

💡 Info: These taxes increase the total cost.

Maximum Number of Installments

Banks in Turkey generally allow 2 to 12 installments.
Legally, the installment period cannot exceed 12 months.

Advantages and Disadvantages of Extra Installments

✅ Advantages:

  • Monthly payment decreases

  • Cash flow becomes easier

❌ Disadvantages:

  • Total interest cost increases

  • Taxes are added

Frequently Asked Questions (FAQ)

Q1: When can I apply for extra installments?

  • Before the transaction appears on your statement.

Q2: Can I apply extra installments to previously installment-rescheduled transactions?

  • No, only unbilled transactions are eligible.

Q3: Is the extra installment interest rate always 4.00%?

  • Generally yes, but it may vary depending on the bank and period.

Q4: Which taxes apply to extra installment interest?

  • BSMV (15%) and KKDF (15%) on the interest amount.

Conclusion: Make Smart Extra Installment Decisions

Credit card extra installments reduce monthly payments but increase total costs. Therefore:

  • Calculate total interest before applying

  • Act before the transaction is billed

  • Consult your bank if needed

🏦 Disclaimer: This calculator is for informational purposes only. For exact rates, consult your bank.

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