Can I Coast FIRE at 40 on $300k income? (married)
Ben & Marcus, 40 and 40, in San Francisco, CA
exampleMarried, no kids yet · $300k/yr household income
They're have been saving hard in San Francisco and want to know if they can finally ease off.
40, married, $300k/yr, about $768k invested. Could they stop contributing today and still retire on schedule, on pure compounding? Here's the Coast FIRE math, and exactly how close they are.
The setup
Age
40
Household income
$300,000/yr
Household
Married, dual income
Liquid savings
$192,000
Retirement savings
$576,000
Target retirement age
65
Investing return
7%/yr
Yes, you can coast with $576,000 saved and retire at 65 with $16M
$16M
Engine-projected NW at 65 if you coast now
Retire spend/mo
$10,678/mo
Coasted NW
$16M
Savings Skipped/yr
$27,000
Coverage
25 yrs
With $576,000 in retirement accounts and zero new contributions, the engine projects $16M net worth at age 65 on $10,678/mo of retirement spending (≈ $5,100/mo in today’s dollars). You'd free up ~$2,250/mo but give up $1.6M in retirement wealth compared to keeping current contributions.
| Scenario | Strategy | Retire NW | Retire SWR/mo | Coverage | Retirement Feasible |
|---|---|---|---|---|---|
| Full save | Keep saving (current plan) | $17,157,469 ($8.2M in today's dollars) | $57,192 | 25 yrs | Secure |
| 50% save | Half contributions | $16,915,694 ($8.1M in today's dollars) | $56,386 | 25 yrs | Secure |
| Coast | Coast, stop all contributions | $15,536,714 ($7.4M in today's dollars) | $51,789 | 25 yrs | Secure |
Coasting assumes markets deliver historical returns. A prolonged downturn early on could derail the math.
Your real retirement date hinges on your exact savings rate, spending, and timeline. Change one input and the answer moves. Model yours and see.
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Can a married household earning $300k at 40 Coast FIRE?
Yes, you can coast with $576,000 saved and retire at 65 with $16M
Engine-projected NW at 65 if you coast now
$16M, modeled with Rightmont's projection engine for this exact scenario.
How was this calculated?
Rightmont runs your numbers through a year-by-year projection engine (taxes, compounding, Social Security, and your real cashflow) to model the outcome. Model your own version free in under a minute.
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For educational purposes only, not financial advice.