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Finance

Compound Interest Calculator

Simulate long-term investment growth with automatic interest compounding. Includes recurring contributions and inflation adjustments.

Investment Parameters
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%

Indicative estimate assuming all accumulated gains are realised and taxed at the end of the investment term. Spanish savings tax brackets are applied progressively: 19% up to €6,000, 21% from €6,000 to €50,000, 23% from €50,000 to €200,000, 27% from €200,000 to €300,000, and 28% above €300,000. Actual taxation may vary depending on the financial product and when returns are generated or realised.

Compounding Frequency
Investment Projection
Nominal Final Balance
Estimated Net After Tax
Real Balance (Inflation Adj.)
Total Contributed
Interest Earned
Estimated Tax
Year-by-Year Growth
Year Start Principal Contributed Interest End Balance Real Balance
Scenario Comparison (same term & contributions)

* Scenarios use your same inputs but vary the annual interest rate.

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