Compound interest calculator
Calculate compound interest: final value, interest earned and capital growth. Free calculator with monthly, quarterly and yearly compounding.
Savings and deposit calculators
Current for 2026How we verify data: Methodology →
Savings account calculator
Calculate how much you will earn on a savings account. Enter the amount, interest rate and term, and the calculator works out gross interest, Belka tax and the net balance.
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How we calculate the account return
Interest = principal × rate / 12 × months. Tax = interest × 19%. Net balance = principal + interest − tax.
Example: 10 000 zł, interest 5%, 12 months
Gross interest: 500 zł. Belka tax (19%): 95 zł. Net interest: 405 zł. Final balance: 10 405 zł.
Frequently asked questions
What is the Belka tax?
It is a 19% flat tax on capital gains, including interest from savings accounts and deposits in Poland.
Is interest taxed automatically?
Yes, the bank usually withholds the 19% Belka tax and pays it to the tax office, so you receive net interest.
How is savings interest calculated?
Annual interest is the balance times the annual rate; for shorter terms it is prorated by the number of months.
Does the rate stay the same?
Promotional savings rates are often temporary and may drop after a few months, so check the bank terms.
Is a savings account the same as a deposit?
No, a savings account lets you withdraw at any time, while a fixed deposit locks the funds for a set term.
Can I withdraw money at any time?
Yes, savings accounts are usually flexible, though some limit the number of free withdrawals per month.
Result is indicative. Banks may use different methods of accruing interest.
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ResultPLN 11,307.92kwotaKoncowa
- odsetkiNetto
- PLN 1,307.92
- odsetkiBrutto
- PLN 1,614.72
- podatekBelki
- PLN 306.80
- efektywnaRocznaStopa
- 4.18