What is FIRE? FIRE stands for Financial Independence, Retire Early, a lifestyle and savings strategy where you accumulate enough invested assets that work becomes optional, typically decades before traditional retirement age. The movement blends aggressive saving (often 40–70% of income), low-cost index investing, and intentional spending to compress the timeline from earning to freedom.
The math is simple: FIRE is reached when your portfolio can sustainably cover annual expenses using a safe withdrawal rate. If your annual expenses are $40,000 and you target a 4% withdrawal rate, your FI Number is $1,000,000. Saving 50% of a $100,000 salary, and investing at a 7% real return, gets you there in roughly 17 years from zero. Cut expenses to $30,000 and the same savings rate hits FIRE in about 13 years.
FIRE is not one-size-fits-all. Subcategories (Lean, Fat, Coast, Barista, Chubby) reflect different target lifestyles and risk tolerances. Critics point to healthcare costs, sequence-of-returns risk, and lifestyle inflation; proponents counter that the optionality alone, the ability to quit a bad job, take a sabbatical, or move countries, pays for itself emotionally long before the full number is hit.