The FIRE blooper reel: common mistakes and how to avoid them

By Tom, CPA · Updated October 25, 2026

TL;DR: Most FIRE plans that wobble don't fail on investment returns. They fail on lifestyle creep, underestimated costs (health care, taxes, inflation), too little flexibility, or retiring from something without retiring to anything. Each mistake has a simple, boring fix.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Welcome to the blooper reel. Every mistake below has been made by smart, careful people, which is the whole point: these aren't failures of intelligence, they're failures of attention. The good news is that each one has a fix, and most of the fixes involve nothing more exciting than a calendar reminder.

Our recurring cast is here to act them out. Lavish Larry plays most of the roles. He's very committed to the craft.

CPA Warning Label: Reading this list may cause mild embarrassment and sudden spreadsheet edits. Both are healthy.

Blooper 1: lifestyle creep

Larry gets a raise. Larry gets a nicer car “because the old one was getting old.” Larry's FIRE number quietly rises by 25 times the extra spending. Every $10,000 of permanent annual spending adds $250,000 to a 4% target. Larry is now running on a treadmill that speeds up whenever he does.

The fix: decide in advance what share of each raise goes to savings, automate it the day the raise starts, and make every lifestyle upgrade a conscious decision. See growing income and keeping the raise.

Blooper 2: forgetting inflation

Larry calculated his FIRE number in today's dollars and then compared it to a future account balance in future dollars. Mixing the two is like measuring a room in feet and buying carpet in meters.

Illustration: at a constant 3% inflation rate, prices roughly increase by a factor of 1.81 over 20 years. A $50,000 lifestyle today would cost about $90,306 in 20 years.

The fix: do all planning in today's dollars with real (after-inflation) returns, as our calculators do, or in future dollars with nominal returns, but never mix them.

Blooper 3: underestimating health care

If an employer has been paying most of your health premium, your paycheck has been hiding one of your largest future costs. Marketplace premiums, deductibles and out-of-pocket maximums can be a large line in an early retiree's budget, and subsidy rules depend on income and change over time.

The fix: get real quotes from the official marketplace for your location and household, and budget for a bad year, not just an average one. Read Health insurance before Medicare and the HSA as a retirement account.

Blooper 4: forgetting taxes on withdrawals

Larry has $1.5 million, nearly all in a traditional 401(k), and plans to spend $60,000 a year. The 4% rule says he's good. The IRS says it would like a word, because withdrawals from pre-tax accounts are taxable income.

The fix: include estimated taxes in your spending number, diversify across account types while you're working, and plan withdrawals to use low brackets. See FIRE and taxes.

Blooper 5: treating 4% as a guarantee

The 4% rule describes historical 30-year outcomes. Larry is planning a 50-year retirement with zero flexibility and 100% stocks, and he is very confident. Confidence is not an asset class.

The fix: add margin, plan flexible spending, hold a cushion. See the 4% rule and sequence-of-returns risk.

Blooper 6: no bridge to the money

Larry has plenty of money, all of it in accounts with early-withdrawal penalties, and plans to retire at 45 next Tuesday.

The fix: map out which accounts fund which years before you retire. Taxable accounts, Roth contributions, the Rule of 55, 72(t) and Roth ladders all have roles. See accessing retirement money early.

Blooper 7: ignoring lumpy expenses

Cars, roofs, appliances, family events and medical surprises don't arrive monthly, so they don't show up in a monthly budget. They do show up, though. Usually all together, usually in the same month as a market drop. That's not a statistic; it's just how it feels.

The fix: convert each one into an annual reserve amount and include it in your FIRE number. See tracking spending.

Blooper 8: over-optimizing the accumulation years

Frugal Fran gets a cameo here. She cut every joy from her budget, skipped every trip, and is miserable. She will reach FIRE fast, as a person who no longer knows what she enjoys. Extreme frugality can also be hard to sustain, and burnout can derail a plan entirely.

The fix: spend on what you truly value, cut ruthlessly on what you don't, and aim for a pace you can keep for years. A slightly later date with a better life along the way is a fine trade.

Blooper 9: retiring from something, not to something

Larry retires. Week one is magnificent. Week six, he has reorganized the garage twice and is reading the terms and conditions of his phone plan for fun. Many people find that work provided structure, social contact and identity, and those don't automatically get replaced.

The fix: plan your time, relationships and purpose as carefully as your portfolio. Read the psychology of retiring early.

Blooper 10: complexity for its own sake

Seventeen funds, four brokerages, eleven tabs of spreadsheets, and a strategy Larry heard about yesterday. Complexity doesn't feel like risk, but it creates room for mistakes, missed deadlines and forgotten accounts.

The fix: consolidate accounts, use a few broad funds, and write a one-page plan. See index-fund investing for FIRE.

Blooper 11: not writing anything down

If something happened to you tomorrow, could your spouse or a trusted person find every account? FIRE plans with no documentation are fragile in ways that have nothing to do with markets.

The fix: keep a current list of accounts, beneficiaries and key contacts, plus a simple balance sheet, somewhere secure that the right people can access. Review beneficiaries on every account.

FIRE Danger Scale

• Level 1: zero or one blooper, caught early. Normal.
• Level 3: three or more bloopers. Fixable, but fix them before the retirement date, not after.
• Level 5: all eleven. Larry, we need to talk.

What to do this week

1. Go through the eleven bloopers and mark each one “fine,” “needs work,” or “oh no.”
2. Pick the single “oh no” with the biggest dollar impact and schedule an hour to fix it.
3. Check the beneficiary designations on every retirement account and HSA.

The bottom line

FIRE plans rarely fail from one dramatic event. They fail from a handful of quiet, fixable assumptions. Find yours now, while fixing them is cheap.

This article is general education and not advice. The cast (Captain Compound, Frugal Fran, Lavish Larry, Doctor Drawdown) is fictional, and so are the example households. Your numbers will differ.