Coast FIRE at 50

Coast FIRE number at 50

$543,669

On $5,000 a month of spending, invested once and never added to, compounding at 7 percent real for 15 years until 65. That is 36 percent of the $1,500,000 you are aiming at.

Fifteen years of compounding roughly doubles and a half what you hold, so the coast number at 50 on $5,000 a month of spending is about $544,000.

That is more than a third of the $1.5 million target, and at this point the word coasting starts to oversell what is happening.

Coast FIRE at 50 by monthly spending

Monthly spending	FIRE number	Coast FIRE at 50
$3,000	$900,000	$326,201
$4,000	$1,200,000	$434,935
$5,000	$1,500,000	$543,669
$6,000	$1,800,000	$652,403
$8,000	$2,400,000	$869,870

At 50 the interesting question is no longer coasting

The gap between the coast number at 50 and the full FIRE number is smaller than the gap at any younger age. If you have $544,000 at 50, you are within reach of $1.5 million by 65 without contributing, but you are also close enough that continuing to contribute pulls the date forward substantially rather than marginally.

For most people at 50 the more useful calculation is not the coast number at all. It is the withdrawal rate, the bridge to Social Security, and whether claiming at 62, 67 or 70 makes the difference. Filing at 62 with a full retirement age of 67 pays 70 percent of your primary insurance amount for life. Waiting to 70 pays 124 percent. That spread is worth more to most 50 year olds than any optimisation of the coast number.

If returns disappoint

The return assumption moves this number more than anything else you can control. At $5,000 a month of spending, here is the same calculation at 50 across a realistic range.

Real return	Coast FIRE at 50
5 percent	$721,526
6 percent	$625,898
7 percent	$543,669
8 percent	$472,863

Run it on your own numbers

Your spending, your retirement age, your return assumption, and what you already have invested.

Open the Coast FIRE calculator

Common questions

Can I still retire early from here?

Yes, but not by coasting. Coasting is a strategy for people with time, and at 50 the lever with the most force left is your savings rate over the next decade, not the compounding of what you already hold.

Should I be moving into bonds?

This is the age the research actually addresses. Pfau and Kitces tested starting retirement at 30 percent equities and rising to 70 percent, against a static 60/40, and the rising path produced a higher success rate with lower average equity exposure. The important part is that the bond position comes back down after retirement. Building it and then holding it forever is just a conservative portfolio.

Coast FIRE at other ages

Figures assume a 4 percent withdrawal rate, 7 percent real returns and retirement at 65, with spending expressed in today's money. This is general information, not financial advice.