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Current for 2026Methodology

Loan repayment schedule calculator

Enter the loan amount, annual interest rate and number of instalments to instantly see the monthly payment, total interest and overall repayment cost. The calculator supports two repayment types: equal (annuity) instalments and decreasing (constant principal) instalments.

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How we calculate the repayment schedule

For equal (annuity) instalments: payment = P × r × (1+r)^n / ((1+r)^n – 1), where P = loan amount, r = monthly rate (annual rate / 12 / 100), n = number of instalments. For decreasing instalments: principal part = P / n; interest for month k = balance × r, where balance decreases by the principal part each month. Total interest is the sum across all months.

Example: PLN 300,000 loan, 7.5%, 240 instalments

For a mortgage of PLN 300,000 at 7.5% and 240 equal instalments, the monthly payment is about PLN 2,416. Total interest is about PLN 279,800 and the total repayment exceeds PLN 579,000. With decreasing instalments the first payment is higher (~PLN 3,187) but the total interest paid is lower.

Frequently asked questions

What is a loan repayment schedule?

A loan repayment schedule is a detailed plan showing each payment amount, the split between principal and interest, and the remaining balance after each instalment.

What is the difference between equal and decreasing instalments?

Equal (annuity) instalments are constant throughout the loan term. Decreasing instalments have a fixed principal component; interest falls because it is charged on a shrinking balance.

Which type of instalment is cheaper overall?

Decreasing instalments generally result in lower total interest because the principal balance falls faster. However, early payments are higher, requiring greater creditworthiness.

Annuity payment = P × r × (1+r)^n / ((1+r)^n – 1), where P is the principal, r is the monthly rate and n is the number of payments.

APRC (Annual Percentage Rate of Charge) includes not only interest but also fees, commissions and other costs. The nominal rate covers interest only. APRC gives a more complete picture of the loan cost.

At 7.5% and 240 equal instalments the monthly payment is about PLN 2,416. Use the calculator above for other rates or terms.

Total cost = sum of all instalments – original principal. It equals total interest paid (plus any fees not included here).

Switching from equal to decreasing instalments (or vice versa) requires renegotiating with the bank and signing an amendment to the loan agreement.

After overpayment the bank usually offers either a shorter term or lower future instalments. Both reduce total interest — a shorter term is generally more cost-effective.

No — the calculator computes interest based on the nominal rate only. The actual loan cost may be higher due to fees, insurance and other bank charges.

Results are for illustration only and do not constitute a credit offer. The actual instalment may differ due to fees, insurance and other bank charges. Refer to your loan agreement for exact figures.

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