See how a lump sum and regular contributions could grow over time — and how much of that growth is actually the interest working for you, not just what you put in.
A common choice is roughly the rate of inflation, so your contribution keeps the same real spending power over time — but this can be any percentage you like.
Assumes growth compounds monthly at a constant rate — real investments fluctuate year to year, so treat this as a long-run estimate, not a guarantee.
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