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GuidesFinanceInterestBank interest — deposits and capitalization

Bank interest — how to calculate

Calculate in 30 seconds

Use our calculator — result in seconds, no registration required.

Interest calculator — calculate interest amount

Table of contents

  • Capitalization
  • How to calculate deposit interest
  • Tax on capital gains
  • Comparing offers
  • Renewable and progressive deposits
  • Common mistakes
  • Inflation impact
  • Frequently asked questions (FAQ)

Bank interest depends on the rate, deposit period and capitalization frequency. Here’s how to calculate it and compare offers safely.

Capitalization

Capitalization adds interest to the principal. More frequent capitalization usually increases the final result.

How to calculate deposit interest

Use simple interest and then account for capitalization. The bank interest calculator gives a quick estimate.

Tax on capital gains

Deposit interest is usually taxed and banks often withhold the tax automatically, so clients receive the net amount.

Comparing offers

Compare effective rates after capitalization and the net result after tax.

Renewable and progressive deposits

Renewable deposits may have different rates in the next period, while progressive deposits change over time. Treat each period separately.

Common mistakes

  • comparing only the nominal rate,
  • ignoring tax,
  • ignoring capitalization.

Inflation impact

A nominal rate is not the whole picture. With higher inflation, the real return can be lower, so compare the real value after the deposit ends.

Try it in practice

Use our calculator — result in seconds, no registration required.

  • Interest calculator — calculate interest amount
  • Tax interest calculator — arrears interest
  • ZUS interest calculator
  • Loan interest calculator
  • Bank interest calculator — deposits & capitalization

Frequently asked questions (FAQ)

Co to jest kapitalizacja odsetek?+
Kapitalizacja to dopisywanie odsetek do kapitału, co zwiększa bazę do dalszych odsetek.
Czy kalkulator uwzględnia podatek Belki?+
Nie, podatek trzeba uwzględnić osobno.
Jak porównać lokaty o różnych okresach?+
Porównuj efektywną stopę i wynik netto po podatku.

Related guides

  • Statutory interest — rates and calculation
  • Interest note — how to issue and calculate
  • Tax interest — rules and calculation
  • ZUS interest — calculation rules
  • Loan interest — how to calculate

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Related calculators

  • Interest calculator — calculate interest amount
  • Tax interest calculator — arrears interest
  • ZUS interest calculator
  • Loan interest calculator
  • Bank interest calculator — deposits & capitalization

Related guides

  • Statutory interest — rates and calculation
  • Interest note — how to issue and calculate
  • Tax interest — rules and calculation
  • ZUS interest — calculation rules
  • Loan interest — how to calculate
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