Mortgage Calculator Poland 2026

Calculate your mortgage payment in Poland. Equal vs decreasing installments, WIBOR, WIRON, APR (RRSO), total cost of credit — complete 2026 guide for foreigners and locals.

Who Needs This Calculator

• First-time buyers estimating affordability and monthly burden
• Refinancers comparing current rate vs offers from other banks
• Early-repayment planners calculating interest savings
• Buy-to-let investors checking rent-vs-payment ratios
• Negotiators walking into banks with specific numbers

What the Calculator Tells You

Three key outputs:

1. Monthly installment (equal or decreasing)
2. Total interest paid over the loan lifetime
3. APR / RRSO (Rzeczywista Roczna Stopa Oprocentowania) — including fees and mandatory insurance

Mathematical Formulas

Equal Installments (Annuity)

$$ R = K \cdot \frac{r(1+r)^n}{(1+r)^n - 1} $$

Where:

• R = monthly payment
• K = loan amount
• r = monthly interest rate (annual / 12)
• n = number of months

Decreasing Installments

$$ R_k = \frac{K}{n} + (K - (k-1) \cdot \frac{K}{n}) \cdot r $$

First installment is largest; each subsequent payment decreases by a constant as the interest portion shrinks.

APR (RRSO)

RRSO captures nominal interest + bank fees + mandatory insurance + all credit-related costs, expressed as a single annual rate. Computed iteratively (Excel: XIRR function).

Example: 500,000 PLN, 25 years, 7.5%

Equal installments:

• Principal: 500,000 PLN
• Term: 25 years (300 months)
• Interest: 7.5% annual (0.625% monthly)
• Monthly payment: ~3,694 PLN
• Total payments: ~1,108,200 PLN
• Total interest: ~608,200 PLN

Decreasing installments (comparison):

• First payment: ~4,792 PLN
• Last payment: ~1,677 PLN
• Average payment: ~3,234 PLN
• Total interest: ~470,000 PLN

Conclusion: Decreasing saves ~138,000 PLN in interest but requires ~1,100 PLN more capacity in the first payment (matters for creditworthiness checks).

WIBOR vs WIRON — Polish Reference Rates

Polish mortgages are typically variable-rate: Rate = reference rate + bank margin

• WIBOR 3M: legacy reference rate (e.g. 5.8% in March 2026)
• WIRON: replacement benchmark (reform started 2023, transition ongoing)
• Margin: fixed at signing (typically 1.7-2.5%)

Banks reset rates every 3 months to the current WIBOR/WIRON. A 1 percentage point rate drop on a 500,000 PLN loan saves ~300 PLN/month.

Interest Rate Scenario Comparison

500,000 PLN loan, 25 years, equal payments:

Each 1 pp. costs ~100,000 PLN extra in interest over 25 years.

Term Length Comparison

500,000 PLN, 7.5% interest, equal payments:

Conclusion: Extending from 25 to 35 years cuts monthly by 315 PLN but costs 311,000 PLN more in interest.

Polish Bank Calculators — Overview

• mBank — full APR calculator with fees and insurance (mbank.pl/kredyty-hipoteczne)
• ING Bank Śląski — clean schedule, equal/decreasing comparison
• PKO BP — largest offer base, detailed breakdown
• Santander Bank Polska — government subsidy programs (MdM, Mieszkanie Start)
• Bank Pekao — creditworthiness simulator
• Millennium Bank — transparent calculations, overpayment scenarios
• Alior Bank — aggressive offers, good for refinancing

Recommendation: Don't rely on one calculator. Check at least 3 (your bank + two competitors) — margin differences of 0.3-0.5 pp. translate to 30-50k PLN over the full term.

Early Repayment — Is It Worth It?

One-time 50,000 PLN overpayment in year 5 of a 500,000 PLN / 25-year / 7.5% loan:

• Term shortened: ~4 years earlier payoff
• Interest saved: ~175,000 PLN
• Return on overpayment: 250% in 20 years = ~6.5% annual, risk-free

Compare to alternatives: S&P 500 ETF (~8% nominal, risky), Polish Treasury bonds (~6%, risk-free). Overpayment beats bonds, ties with ETFs depending on risk tolerance.

FAQ

What is DSTI and how does it affect creditworthiness? DSTI (Debt Service-to-Income) = installment / net income. Polish regulator KNF recommends max 40% for 25+ year loans.

Should I pick a fixed-rate mortgage? Fixed rates (usually 5-10 years in Poland) protect from rate hikes but start 0.5-1 pp. above variable rates.

How is the bank's commission calculated? Commission (1-3% of loan amount) is added to the credit cost and included in RRSO.

Can I repay early without penalty? After 3 years from signing — yes, by law. In the first 3 years, banks may charge early-repayment fees.

What are "credit holidays" (wakacje kredytowe)? A government program letting borrowers suspend 4 payments per year (2024-2025). Check current eligibility.

Can foreigners get a Polish mortgage? Yes. EU/EEA citizens face no special restrictions. Non-EU citizens typically need residency and stable Polish income.

Hidden Costs Beyond the Monthly Payment

For a 500,000 PLN loan, expect additional costs:

• Bank commission: 0-3% of loan = 0-15,000 PLN
• Low down-payment insurance (if deposit <20%): 0.3-0.5% annually
• Bridge insurance (until mortgage registered in land registry): +0.5-1 pp. on interest for 2-6 months
• Property insurance: ~300-600 PLN annually
• Life insurance (often required): 0.5-2% annually on principal
• Property appraisal: 400-800 PLN
• Notary + PCC (civil law tax): ~2% of property value
• Land registry entry: 200 PLN

Total closing costs: 3-6% of property value. On a 600,000 PLN apartment, that's 18-36,000 PLN beyond your down payment.

Track Your Mortgage Against the Full Picture — Freenance

A mortgage often takes 30-40% of monthly budget. Freenance shows how your mortgage impacts your Financial Freedom Runway — how many years you could live without working — factoring liabilities, savings, and investments.

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