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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
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Estimated Net After Tax
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Real Balance (Inflation Adj.)
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Total Contributed
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Interest Earned
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Estimated Tax
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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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