Is 8% a Good Return on Investment?

8% a year is a good return. It is close to the long-run average of a broad stock index, and it is far above what cash or bonds have paid over most periods.

It is also, in a specific sense, unremarkable — because it is roughly what you get for doing nothing clever at all.

What 8% actually compounds to

$10,000, left alone:

Years	Value	Total return
5	$14,693	47%
10	$21,589	116%
20	$46,610	366%
30	$100,627	906%

The shape of that table is the whole argument for starting early. The first decade adds $11,589. The third decade adds $54,017 — from the same $10,000 and the same rate.

Work out your own with the ROI calculator.

The comparison that decides it

8% is good relative to what?

• A savings account paying 4% — 8% is excellent.
• A broad index fund, which has averaged roughly 10% nominally over the long run — 8% is slightly behind.
• An individual stock or a property, where you took concentrated risk — 8% is poor compensation for that risk. You could have had similar returns from an index fund with far less of it.

That last point matters most. Return without risk is meaningless. Two investments returning 8% are not equivalent if one could plausibly have gone to zero. The relevant question is never "is 8% good" but "is 8% good for the risk I took".

Inflation takes a third of it

This is the part people skip. 8% nominal at 3% inflation is a real return of 4.85%, not 5% — the two rates compound against each other rather than subtracting.

Over 20 years, $10,000 at 8% becomes $46,610 in nominal terms. In today's purchasing power it is $25,807.

Both figures are true. Only the second one tells you what you can buy. The inflation calculator shows the erosion directly.

Where the "8%" you were quoted came from matters

Was it annualised? A 50% total return is 22.5% a year over two years and 2.05% a year over twenty — the same headline, wildly different outcomes. Any return quoted without a time period is not a return, it is a number. Insist on the CAGR.

Was it net of fees? A fund returning 8% gross with a 1.5% expense ratio pays you 6.5%. Over 30 years on $10,000 that difference is worth about $37,000 — more than three times the original investment.

Was it before or after tax? In a taxable account, 8% might be 6% after capital gains tax. In a 401(k) or ISA, it is 8%.

Was it one year or the average? A single good year says nothing. Markets returning 8% on average routinely deliver −20% and +30% along the way.

When 8% is not good enough

If you are behind on a goal with a deadline, the return is the smallest lever you have. Someone with $50,000 saving for retirement in ten years cannot reach $500,000 at any plausible rate — the contribution has to change, or the deadline, or the target. The savings goal calculator makes that trade-off explicit.

And if you are carrying debt above 8%, paying it down is a guaranteed, tax-free return at that rate. A 20% credit card balance beats any investment you will be offered.

The honest summary

8% a year, sustained, over decades, at market-level risk, net of fees, is a genuinely good outcome. Most people who try to beat it end up below it after costs.

The question worth more of your attention is not the rate — it is how much you contribute and how long you leave it alone.