Bank Deposit Calculator

Enter your principal amount, the annual interest rate offered by the bank, and the deposit term in days. The calculator computes gross interest, deducts 19% Polish capital gains tax, and shows your net return and final payout.

Gross Interest = Principal × (Rate / 100) × (Days / 365). Tax = Gross Interest × 0.19. Net Interest = Gross Interest − Tax. Final Amount = Principal + Net Interest.

Yes. In Poland, all interest income from bank deposits is subject to a flat 19% capital gains tax (podatek Belki), withheld automatically by the bank. The calculator shows both gross and net figures.

Gross interest: PLN 500. Tax (19%): PLN 95. Net interest: PLN 405. Final payout: PLN 10,405. Effective net rate: 4.05%.

Enter 90 in the Days field. The calculator will prorate the annual rate accordingly: Interest = Principal × (Rate / 100) × (90 / 365). Note that banks always quote rates on an annual basis.

The formula is currency-agnostic. Enter your principal in any currency; the result will be in the same currency. Just make sure the interest rate matches the one quoted by the bank for that specific currency deposit.

It is the real annualised return after tax: (Net Interest / Principal) × (365 / Days) × 100%. It lets you compare deposits of different durations on an equal footing.

No. The calculator is for informational use only. Actual earnings depend on the bank's offer, terms and conditions, and applicable tax rules. Always verify with your bank before opening a deposit.

Multiply the monthly rate by 12 to get the annual rate, then enter that figure into the Rate field along with the number of days. The calculator will prorate accordingly.

A fixed-term deposit locks in your money for a set period at a fixed rate. Early withdrawal usually forfeits interest. A savings account is more flexible but typically offers a variable, lower rate.