Imagine you’ve saved enough that your existing investments will grow to a full retirement nest egg by age 65 — with zero additional contributions. That’s the core promise of Coast FI (Financial Independence). It’s not about retiring early; it’s about reaching a point where you can stop actively saving for retirement and instead let compound interest do the heavy lifting. This article walks you through exactly how to calculate your Coast FI number, choose the right investment vehicles, and navigate the often-ignored trade-offs. You’ll learn which expenses to include, how to handle inflation, and why Coast FI may feel harder than it sounds once you actually stop contributing.
Coast FI stands for “Coast Financial Independence.” The term was popularized in the early 2010s within the FIRE (Financial Independence, Retire Early) community, but it’s a distinct concept. At its simplest, Coast FI means you have enough invested today that, assuming a reasonable annual return (typically 7% after inflation), your portfolio will grow to cover your expected retirement expenses without any further savings.
What Coast FI is not: It is not early retirement. You still need to work to cover current living expenses and possibly healthcare until you reach full retirement age. It also isn’t a guarantee that you can stop all financial planning — you still need to manage your portfolio, adjust for sequence-of-returns risk, and revisit your assumptions periodically.
The appeal lies in the psychological off-ramp. Once you hit Coast FI, you can take a lower-paying but more fulfilling job, reduce hours, or start a side hustle without worrying about saving for retirement. The money you already have is on autopilot. For many, this reduces the burnout that comes with aggressive saving rates of 50%+.
Your Coast FI number depends on three variables: your target retirement withdrawal amount (e.g., $40,000 per year in today’s dollars), the number of years until traditional retirement age (e.g., 30 years if you’re 35 now), and your assumed real rate of return (net of inflation).
Step-by-step calculation:
Your Coast FI number is the present-day portfolio value needed for your future self. If you already have $131,000 invested at age 35, you can stop contributing to retirement accounts entirely and still retire at 65 with $40,000 per year in today’s purchasing power — assuming your portfolio returns 7% after inflation each year.
Once you hit Coast FI, you have a long time horizon until retirement (often 20–30 years). That means you can afford to stay aggressive — 80–90% stocks is common. But there’s a nuance: you no longer have the buffer of additional contributions to buy more shares during downturns. If the market drops 30% in year one of coasting, your portfolio will be significantly smaller, and it may not recover to the expected future value if the downturn is prolonged. This is sequence-of-returns risk in the accumulation phase.
To mitigate this, consider a “bond tent” approach: shift 10–15% into bonds or cash equivalents for the first 5–7 years of coasting, then gradually reallocate back to stocks as you get closer to retirement. I’ve seen many Coast FI adherents use a target-date fund (like Vanguard’s 2035 fund) set to a date 10 years after they start coasting — this automatically adjusts risk without requiring active management.
Another option is to keep a dedicated cash reserve equal to 1–2 years of living expenses. This prevents you from having to sell stocks at a loss during a correction to cover bills if your job situation changes unexpectedly. Ally Bank or Marcus by Goldman Sachs currently offer high-yield savings accounts at around 4% APY (as of early 2025), which can serve as that buffer.
Your Coast FI portfolio can live in any account type, but the choice affects your flexibility. If you’re still working (even in a lower-paying job), you should prioritize tax-advantaged accounts before taxable brokerage accounts — but only if you won’t need the money before retirement age without penalty.
Roth IRA: Contributions can be withdrawn tax- and penalty-free at any time. Earnings must stay until 59½ to avoid penalties. If you’re coasting before 59½, having a Roth IRA lets you access your contributions in an emergency without derailing your plan. For 2025, you can contribute up to $7,000 ($8,000 if age 50+).
Traditional 401(k) / IRA: Contributions reduce your current taxable income, but withdrawals before 59½ incur a 10% penalty plus income tax. If you plan to Coast FI at 40 and retire at 55, a traditional account isn’t ideal unless you use a strategy like a Roth conversion ladder or Substantially Equal Periodic Payments (SEPP). That requires careful planning and a CPA’s help.
Taxable brokerage account: Most flexible but least tax-efficient. You can sell shares at any time and pay only capital gains tax (0% for singles with income under $47,025 in 2025). I recommend using a low-cost provider like Vanguard, Fidelity, or Schwab. Stick to total market index funds (VTI or ITOT) to minimize turnover and taxable distributions.
For most people under 40 who aim to Coast FI before 50, a mix of Roth IRA and taxable brokerage works well. Max out the Roth first for long-term growth, then use taxable for any additional savings.
Coast FI requires you to cover your current living expenses with your job income — not your portfolio. That means your job must pay enough to sustain life in your specific city. If you live in San Francisco and need $80,000 a year, you can’t coast on a $35,000 barista job unless you’re willing to move or drastically cut housing costs.
The key is to run a “post-coast budget” for at least six months before you quit your current job. Track every dollar to see if your envisioned lifestyle is realistic. I’ve seen people realize they need $45,000 annually, not $35,000, once they account for health insurance premiums and occasional travel.
Healthcare is often the biggest variable. If you Coast FI at 45, you need to cover health insurance until Medicare kicks in at 65. A decent ACA plan with a moderate deductible can cost $600–$1,200 per month for a 50-year-old, depending on subsidies. Many people forget to include this in their Coast FI budget, then struggle when premiums rise. Use the HealthCare.gov calculator to estimate costs for your income level.
As mentioned earlier, a long period without new contributions makes your portfolio vulnerable to an early crash. If you start coasting in January 2026 and the market drops 40% in 2027, you’ll need to either return to high-saving mode or accept a lower retirement income. A simple way to hedge is to delay coasting by 1–2 years past your calculated number — that extra buffer can absorb a bad start.
Using 10% annual returns (the historical nominal average for the S&P 500) is optimistic. After inflation, taxes, and fees, 5–7% is more realistic. I recommend stress-testing your plan with a 4% real return. If your Coast FI number works at 4%, you have a high margin of safety.
Kids, divorce, disability, or a partner’s job loss can derail the best plan. Build an emergency fund of at least six months of expenses outside your Coast FI portfolio. Keep it in a high-yield savings account — not in stocks. I also suggest disability insurance (own-occupation policy) if you’re in a white-collar profession and plan to coast for more than 10 years.
You’ve done the math and have your Coast FI number. But are you emotionally ready? Here are concrete checkpoints:
When all four checkpoints are green, you’re ready to flip the switch. Otherwise, it’s wise to save a little more or find a higher-paying cozy job before leaving full-time work.
Where to start: Coast FI isn’t about having a massive portfolio — it’s about having enough that your future self is taken care of. Start by calculating your number this week using a conservative return assumption (5–6% after inflation). Then map out a realistic “coast job” that at least breaks even on expenses. If you’re within 80% of your target, you can likely reach Coast FI in 2–3 more years of focused saving. The off-ramp is real, but it requires honest budgeting and a willingness to trade career acceleration for freedom. Do the math, test the scenario, and then decide if the coast life suits you.
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