Coast FIRE is the financial independence strategy that lets you stop maxing out retirement contributions and start enjoying your life while your invested money quietly grows to fund traditional retirement. For self-employed people who already trade time for income with no employer match in sight, coast FIRE often makes more sense than chasing full early retirement. I have watched solo business owners hit coast FIRE in their 30s and immediately start working fewer hours, taking longer trips, and choosing projects they actually care about rather than grinding for the highest fee.
This guide explains coast FIRE in plain language, shows how to calculate your number, and walks through how to reach it without sacrificing the years that matter most.
What is coast FIRE
Coast FIRE means you have invested enough money that, with normal market growth and no further contributions, your portfolio will grow into a full retirement nest egg by traditional retirement age. From the moment you hit your coast FIRE number, you only need to earn enough to cover your current living expenses. You can stop saving aggressively and let compound growth do the rest.
It sits between two other points on the FIRE spectrum. Lean FIRE means retiring early on a tight budget. Fat FIRE means retiring early with a high spending floor. Coast FIRE means continuing to work but at a sustainable pace, with retirement already on autopilot.
Why coast FIRE fits the self-employed
Self-employed people face two retirement realities that make coast FIRE attractive. There is no employer 401(k) match handing you free money, so every retirement dollar comes from your own pocket. And the work itself is often more flexible, which means you can scale back hours or rates without quitting outright. Coast FIRE lets you take advantage of that flexibility once you have the assets in place.
The strategy also works because most self-employed careers can extend longer than corporate ones. There is no mandatory retirement, no forced layoff at 55, no manager pushing you out. Coast FIRE assumes you keep working in some form. That is closer to most self-employed people’s actual plans than the all-or-nothing image of traditional early retirement.
How to calculate your coast FIRE number
Three inputs drive the math. Your expected annual spending in retirement. Your assumed real return on investments after inflation. Years between today and your traditional retirement age.
Start with your projected annual retirement spending, then multiply by 25 to get your full FIRE number. This 25x figure assumes a 4 percent withdrawal rate, the rule of thumb backed by the Trinity Study and refined by decades of follow-up research. Then divide that number by the growth factor for the years you have left. For example, if you assume a 5 percent real return and you are 25 years from retirement, the growth factor is roughly 3.4. Your coast FIRE number is the full FIRE number divided by 3.4.
A concrete example. If you expect to spend $60,000 a year in retirement, your full FIRE number is $1.5 million. If you are 30 years from retirement and assume a 5 percent real return, your growth factor is roughly 4.3. Your coast FIRE number is about $349,000. Once your invested portfolio reaches that level, you can stop contributing and let it grow.
The accounts that get you to coast FIRE faster
Self-employed people have powerful tax-advantaged tools to accelerate the path. A SEP IRA, Solo 401(k), and Roth IRA each play a role. The Solo 401(k) typically allows the largest contributions for a one-person business because you contribute as both employee and employer. The Roth IRA gives you tax-free growth, which is valuable if you expect rates to rise.
Current contribution limits and account rules live on the IRS retirement plans for self-employed people page. Check it each year before maxing out, because the numbers shift annually.
Pair retirement accounts with a taxable brokerage account for any savings beyond the annual limits. Money in a taxable account is fully accessible at any age, which matters if your coast FIRE plan includes a few sabbaticals or a step down to part-time work before traditional retirement age.
Why this beats grinding for early retirement
The full FIRE crowd often pushes savings rates of 50 to 70 percent of income. That can work for high earners with no kids in a low-cost city, but for most self-employed people it means sacrificing years of life experience for a finish line that may not arrive on schedule. Coast FIRE asks less of you. You save aggressively for a defined period, then stop saving and just cover your current spending. The aggressive years are shorter, which preserves the energy and freedom that probably drew you to self-employment in the first place.
I have watched people trade the best years of their 30s for a retirement they may never enjoy. Coast FIRE flips that. You front-load the savings while you have the energy and earning power, then redirect time and money to the present.
How to build the savings habit on irregular income
The single biggest barrier I see is inconsistent self-employment income. The fix is to save a percentage of every payment rather than a fixed monthly amount. When a $10,000 invoice clears, send the same percentage to retirement that you would send if it were a $1,000 invoice. That keeps savings flowing in strong months and prevents the panic that leads to skipped contributions in slow ones.
Build the tax reserve first, then the emergency fund, then the retirement contribution. Our self-employed bookkeeping guide walks through the exact bucket system that makes this routine and removes the guesswork.
What to do once you hit coast FIRE
The whole point is to use the cushion. Cut hours back to a sustainable level. Raise your rates and take fewer but better clients. Take a sabbatical. Try a passion project that might not pay for a year. Or just keep working at the same pace and watch the portfolio grow toward fat FIRE.
Once you hit coast FIRE, your psychology around work changes. Every client becomes optional. Every project is something you choose to take, not something you have to take. That shift is the real prize.
Risks to watch
Coast FIRE assumes market returns roughly in line with long-term averages. A long bear market early in your coast period could push back your retirement date. Plan with conservative assumptions, like a 4 to 5 percent real return rather than the historical 7 percent, to give yourself margin.
Healthcare is the other wild card for self-employed people. Without an employer plan, you may face Marketplace premiums for decades. Factor health insurance into your annual spending and check current premium estimates on HealthCare.gov when building your number.
If your business sells products or builds equity that you might exit, those assets can change the math significantly. A business sale can push you from coast FIRE to fat FIRE overnight, so do not forget to value your business in your overall plan.
Coast FIRE compared with other FIRE flavors
Lean FIRE means retiring fully on a small budget, often under $40,000 a year. Fat FIRE targets a larger lifestyle, often $150,000 or more annually. Barista FIRE means working part-time for benefits while drawing from investments. Coast FIRE differs from all of these because it does not require you to stop working. It just removes the need to keep saving for retirement.
For self-employed people who like what they do, coast FIRE is often the smartest middle path. You keep your income, your purpose, and your professional identity while removing the retirement pressure that drives so many bad business decisions.
A simple action plan
Pick your traditional retirement age. Estimate your annual spending in retirement. Multiply by 25 to get full FIRE. Divide by the growth factor for your years remaining. That is your coast FIRE number. Now reverse engineer monthly contributions to hit it within five to fifteen years. Open a Solo 401(k) or SEP IRA if you do not already have one. Automate transfers from each client payment. Track progress quarterly. Once you hit the number, take a breath and start designing the life you actually want.
If you are still figuring out which side ventures or product offerings to invest in alongside your main work, the self-employment ideas guide walks through several income streams that pair well with a coast FIRE plan.
Frequently asked questions
What is coast FIRE in simple terms?
Coast FIRE means you have invested enough that your portfolio will grow into a full retirement nest egg with no further contributions by traditional retirement age. From that point on, you only need to earn enough to cover your current living expenses.
How do I calculate my coast FIRE number?
Multiply your expected annual retirement spending by 25 to get the full FIRE number. Then divide by the compound growth factor for the years between now and traditional retirement age. The result is the amount you need invested today to coast.
Is coast FIRE realistic for self-employed people?
Yes. Self-employed people often have flexible schedules and the ability to scale back without quitting, which fits the coast FIRE strategy well. Solo 401(k) and SEP IRA accounts offer high contribution limits to help you reach the number faster.
What is the difference between coast FIRE and barista FIRE?
Coast FIRE assumes you keep earning enough to cover current expenses while your retirement portfolio grows untouched. Barista FIRE involves working part-time, often for benefits, while drawing from investments to cover the rest of your spending.
What return rate should I assume for coast FIRE planning?
A conservative assumption is a 4 to 5 percent real return after inflation. Historical stock market returns have been higher, but using a lower number gives you a margin of safety against bear markets and unexpected expenses.
Can I still contribute after I hit coast FIRE?
Yes. Coast FIRE simply removes the requirement to contribute. Many people keep contributing at a lower rate to move from coast FIRE toward fat FIRE, which expands the lifestyle their portfolio can support in retirement.
