What Is Coast FIRE (And Have You Already Hit It)?

You’ve probably heard of the FIRE movement (Financial Independence, Retire Early). But there’s a version that’s a lot more attainable for most people, and it doesn’t require living off ramen or wearing the same three t-shirts for a decade. It’s called Coast FIRE, and it’s one of the most powerful ideas in personal finance that most people have never heard of.

What is Coast FIRE?

Coast FIRE is the point at which you’ve saved enough money that, even if you never contribute another dollar to retirement, your investments will grow on their own to fund a comfortable retirement by your target age.

Think of it like pushing a boulder to the top of a hill. Once it’s over the crest, it rolls on its own. Coast FIRE is that crest.

Once you hit your Coast number, the math is working for you whether you’re grinding at a high-paying job or stepping back to become a personal trainer, spend a season overseas, or launch something you’ve always wanted to try. Your retirement is already funded, quietly compounding in the background.

How is it different from regular FIRE?

Traditional FIRE requires you to accumulate enough to live off your investments indefinitely, usually 25x your annual expenses (the 4% rule). That is a big number, and it often requires intense saving for decades.

Coast FIRE only requires you to hit a smaller target early enough that compound growth does the rest. You still need income to cover your day-to-day expenses after you coast, but you are no longer racing to hit a massive lump sum.

• Traditional FIRE: Save aggressively until your portfolio fully funds your lifestyle forever.
• Coast FIRE: Save enough early that growth takes care of retirement, then work just enough to cover living expenses.
• Barista FIRE: Similar to Coast, but you intentionally take a lower-stress part-time job (with maybe some benefits) while your portfolio grows.

The math behind it

Your Coast FIRE number depends on three things: how much you’ll need in retirement, how many years you have for compound growth to work, and what return rate you assume. The formula works backwards from your retirement goal.

For example, if you want $2 million at age 65 and you are currently 35, you have 30 years for money to grow. Assuming a 7% real return, you would only need to have roughly $263,000 saved today to coast to that goal without contributing another dollar.

That’s the power of starting early and giving compound interest room to run.

What do you do after you hit your Coast number?

This is where it gets interesting and personal. Hitting your Coast FIRE number does not mean you stop working. It means you stop having to work for your future. From that point, you only need income to cover your current lifestyle.

We have worked with clients who used this milestone to:

• Transition from a high-stress corporate role to a part-time consulting arrangement
• Go back to school or pursue a second career they had always wanted
• Spend a year doing missions work or volunteering overseas
• Become a personal trainer, coach, or instructor, doing meaningful work without the pressure of saving for retirement
• Simply slow down and be more present with family

None of these paths require you to be “done” with work. They just require that retirement is already taken care of.

A real example

Consider someone in her mid-30s who is in a high-earning, high-energy season of her career and is being intentional about making the most of it. She is saving aggressively, and she knows exactly what her Coast FIRE number is and how far away she is from hitting it. That clarity changes how she thinks about the saving years. Instead of an open-ended grind, she has a finish line. Once she crosses it, her options open up in a real way. The possibility of stepping into work she is more passionate about, on her own terms, is already on the table. Knowing the number makes the sacrifice feel purposeful rather than indefinite.

Common questions

“I still need to invest after I coast”

You do not have to, but you can. Many people find that even after hitting their Coast number, they continue contributing a little just to give themselves more cushion or flexibility. There is no rule that says you must stop.

“Does the portfolio I build actually matter, or just the number I save?”

The most important work in retirement planning is on the planning side: the savings rate, the timeline, the tax strategy, the income sequencing. That is where the biggest decisions get made. But how your portfolio is constructed matters too, and it is something many advisors do not pay enough attention to. We favor passive index exposure in equities, where historical data suggests active managers have broadly underperformed over long periods, while using active management in fixed income, where the market’s complexity has historically created more opportunity for skilled managers to add value. Where appropriate for a client’s situation and risk tolerance, we may also incorporate alternatives such as private credit, infrastructure, or real estate, which have the potential to improve diversification and reduce portfolio volatility. Past performance does not guarantee future results, and no investment strategy can eliminate risk.

“This only works if you started saving young”

Earlier is better, but it is not the only path. Someone who starts at 45 with an aggressive savings rate can still reach a meaningful Coast number. The target just looks different, and the timeline to retirement may shift. The calculator above will show you exactly where you stand.

Where a calculator stops and a financial plan begins

This calculator gives you a useful starting point, but Coast FIRE planning gets more nuanced quickly. The inputs above assume a single return rate and a straightforward accumulation path. Real financial plans rarely look that clean.

Here are some of the factors that can meaningfully change the picture:

• Tax treatment of your accounts. A dollar in a Roth IRA, a traditional 401(k), and a taxable brokerage account are not worth the same dollar in retirement. How you draw down each bucket matters a great deal, and the sequencing can be optimized.
• Social Security timing. When you claim Social Security is one of the biggest retirement income decisions you will make. Claiming at 62 versus 70 can mean a difference of 75% or more in your monthly benefit.
• Roth conversion opportunities. The years between retiring from full-time work and drawing Social Security can be an ideal window to convert pre-tax dollars to Roth at a lower tax rate. This kind of planning does not show up in a basic Coast FIRE number.
• Healthcare before Medicare. If you stop working before 65, bridging health insurance is often one of the biggest line items in a financial plan. It has to be accounted for.
• Income changes and career transitions. Coasting does not always mean a clean break. Part-time work, a business, or a career pivot all create their own planning questions around income, benefits, and savings opportunities.
• Estate and protection planning. Life insurance, disability coverage, beneficiary designations, and estate documents all interact with your retirement plan in ways the Coast number does not capture.

The Coast FIRE framework is a genuinely powerful way to think about your financial life. But the number the calculator gives you is a floor, not a plan. Working with an advisor means understanding what levers are available to you, which ones make sense given your situation, and how to build a path that holds up when life does not go according to the spreadsheet.

This article is for informational and educational purposes only. It does not constitute financial, tax, or investment advice. Coast FIRE calculations are illustrative and based on assumptions that may not reflect your personal situation. Investment returns are not guaranteed and past performance does not predict future results. Please consult a qualified financial advisor before making any financial decisions.