Compound interest

💰 Watch your money compound.

Project the growth of a lump sum plus regular monthly contributions, then see what's left after tax and what a 4% withdrawal sustains. Fields default to long-run S&P 500 assumptions.

Your plan

€

€

years

% / yr

Effective annual rate. S&P 500 nominal long-run average ≈ 10%.

% / yr

Used for the "today's money" view. Euro-area target ≈ 2%.

% on gains

PT mais-valias default = 28%. Applied to profit only.

% / yr

The "4% rule" annual drawdown.

View

Final value

—

Your money

—

Total contributed

Interest gained

—

Growth over time

Contributions Interest

After redeeming

Gross final value—
Taxable gain—
Tax due —
Net in your pocket—

The 4% rule

Annual income (gross)—
Monthly income (gross)—
Annual income (post-tax)—
Monthly income (post-tax)—

Sustainable drawdown at the rate above, applied to the final balance. Post-tax figures assume each withdrawal is taxed at the gains rate — a rough upper bound, since real withdrawals mix principal and profit.