Chubby FIRE

The FIRE movement labels early-retirement goals by budget size. Lean FIRE covers a frugal budget, often under about $40,000–$50,000 a year, and Fat FIRE a generous one, often $150,000 and up. Chubby FIRE is the comfortable middle: enough for a good home, regular travel and some margin, without the much larger portfolio of the top tier. The bands are informal and overlap, and household size and local costs move them. The table below shows what each band implies at a 4% and a more cautious 3.5% withdrawal rate.

Government data gives a useful anchor. In 2024 the average US household spent $78,535, households in the fourth income fifth spent $89,972, and the top fifth spent $150,342, according to the Bureau of Labor Statistics. A Chubby FIRE budget funds roughly what upper-middle-income working households spend, but without the paycheck.

Other labels describe a route rather than a budget, so they combine with any band. Coast FIRE is a savings milestone, Barista FIRE pairs a smaller portfolio with part-time pay, and Slow FI spends some of the freedom on the way.

A comfortable budget sets a bigger target, so the practical question is how many working years it takes. The formula below solves for the years needed to grow today’s investments plus steady yearly savings into the target. It assumes a constant real return, meaning a return after inflation, so every figure stays at today’s prices.

The worked example shows why trimming the budget is such a strong lever. At a 4% withdrawal rate, each dollar cut from yearly spending lowers the target by $25, and the same dollar is saved instead of spent. Moving between a chubby and a more modest budget can therefore remove several working years. The reverse also holds: lifestyle inflation during high-earning years pushes the finish line away.

Treat the answer as a rough guide. Markets do not deliver a steady 5% a year, and the order of returns matters once withdrawals begin, so a plan built on an average should be checked with Monte Carlo simulation or historical tests.

Chubby FIRE suits dual-income professionals, such as DINK households, and other high earners who want to stop well before 65 without living on a strict budget. Its main advantage is room to adjust. A $100,000 budget might hold $30,000 or more of travel, dining and hobbies that can shrink after a market slump, a buffer a lean plan lacks and the reason chubby plans pair well with dynamic spending rules. It also leaves room for costs a lean plan struggles to absorb, such as children or a health condition.

The main cost is time. The target is roughly double a lean one, so reaching it takes more years of earning or a higher savings rate. A larger budget also means larger withdrawals and more tax on them, and parts of it tend to harden into fixed costs, such as a bigger home, that no longer bend in a downturn.

Health insurance before Medicare at 65 is where a chubby budget meets a hard income line. For 2026 coverage, the marketplace premium tax credit requires household income between 100% and 400% of the federal poverty line. The enhanced credits that reached higher incomes expired after 2025, so above 400%, which is $84,600 for a couple, there is no credit at all. That line falls inside the chubby spending range.

What counts is modified adjusted gross income, not spending. Money from cash savings, the cost basis of shares sold, and Roth IRA contributions is not income, so a couple spending $100,000 can report far less and keep a credit. One large Roth conversion or capital gain in the same year can push income over the line and erase the whole credit. From 2026 there is also no cap on paying back excess advance credit, so a household that took the credit all year and then crosses the line repays all of it when it files. That makes the order of withdrawals a health-cost decision as well as a tax one.

A comfortable budget feels safe, which is why its gaps go unnoticed. The costs that break chubby plans rarely show up in a normal year: a replacement car every eight to ten years, a roof, a child’s wedding or tuition. Assumptions set once, such as the spending figure or the expected return, also age badly over a decade of saving. Recheck the items below every year before choosing a date, and keep a fallback, such as part-time work or a smaller budget, for whatever the list misses.