Total Credit Cost Calculator

The total cost of credit (CKK) is the sum of all charges paid by the borrower excluding repayment of the principal: interest, bank commission, mandatory insurance and other required fees.

CKK is the amount in PLN — how much you pay over the principal. APR (RRSO) expresses the same information as an annualised rate factoring in the repayment schedule, enabling fair comparisons across lenders.

Most effective methods: larger down payment, shorter loan term, negotiating margin and commission, choosing cheaper third-party insurance, and making regular extra capital repayments.

On a 300,000 PLN loan at 7.5% over 30 years, total interest is approximately 455,000 PLN — over 1.5× the borrowed principal. Shortening to 20 years saves about 140,000 PLN in interest but raises the monthly payment by around 400 PLN.

Commission is a one-off fee charged upfront (typically 0–3% of the loan). On a 300,000 PLN loan with 2% commission that is 6,000 PLN. Banks often offer lower rates in exchange for higher commission — compare total APR for both options.

Property insurance (fire and other perils) is always mandatory. Life insurance may be required to obtain a lower margin. You can choose your own external insurer instead of the bank's — usually cheaper.

Yes — every extra payment reduces the outstanding balance and future interest. You can choose to shorten the term or reduce the monthly payment. On a 300,000 PLN 30-year mortgage, an extra 20,000 PLN repayment early on can save about 50,000 PLN in interest.

Compare APR (RRSO) — it includes all costs. Also check: total CKK in PLN, required insurance amounts, early repayment conditions and rate type (fixed vs. variable WIBOR).

An annuity payment is a fixed monthly instalment throughout the loan term. The formula is: R = K × [i × (1+i)ⁿ] / [(1+i)ⁿ – 1]. Initially most of the payment is interest; over time the capital portion grows. The alternative is a decreasing-instalment loan (lower total cost but higher initial payments).

A fixed rate provides predictability — the payment does not change for a set period (usually 5–10 years). Variable rates (based on WIBOR) are typically lower initially but risky when rates rise. In 2026, with relatively high interest rates, a fixed rate is a more attractive option for new borrowers.