FIRE and taxes: what a CPA wants you to know

By Tom, CPA · Updated October 25, 2026

In short: A CPA's overview of how taxes shape a FIRE plan: using pre-tax, Roth, and taxable buckets, treating low-income years as an opportunity, and knowing the rules for reaching retirement money early.

Educational only, not tax advice. Limits and rules change; verify current figures at IRS.gov.

Most FIRE content focuses on the accumulation phase: savings rate, index funds, and the 4% rule. Those matter. But once you stop drawing a paycheck, taxes become one of the biggest levers you still control. Two people with identical portfolios can pay very different amounts of tax in early retirement depending on which accounts they hold and in what order they draw from them. Here is the framework I'd want every FIRE planner to understand.

1. Think in three tax buckets

Almost every investment dollar sits in one of three buckets:

• Pre-tax (tax-deferred): traditional 401(k), 403(b), 457(b), traditional IRA. You got a deduction going in; withdrawals are taxed as ordinary income.
• Roth (tax-free): Roth 401(k), Roth IRA. You paid tax going in; qualified withdrawals are tax-free.
• Taxable brokerage: no special wrapper. You pay tax on dividends and on realized gains, often at long-term capital gains rates, but you can access the money anytime.

A health savings account (HSA) is a useful fourth bucket if you're eligible: contributions can be deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free.

Early retirees usually want some balance across buckets. Pre-tax savings give you deductions while your income (and tax bracket) is high. Roth and taxable money give you flexibility to control your taxable income later, which matters a lot for health insurance subsidies and other income-tested items.

2. Your early-retirement years may be low-tax years

When paychecks stop, many FIRE retirees find themselves in the lowest tax brackets of their adult life, sometimes for a decade or more before Social Security and required minimum distributions (RMDs) begin. That's an opportunity, not just a byproduct.

Two common ways to use those years:

• Roth conversions: move money from pre-tax accounts into a Roth, paying tax at today's low rates rather than potentially higher rates later. See Roth conversion ladders explained.
• Capital gains harvesting: federal tax law has a 0% long-term capital gains rate for taxpayers whose taxable income falls below a threshold that's adjusted for inflation each year. In a low-income year you may be able to sell appreciated investments, pay no federal tax on the gain, and rebuy to reset your cost basis. Check the current year's threshold, and remember state tax may still apply.

The catch: Roth conversions and realized gains both raise your income, and that income can reduce health insurance subsidies. You have to plan these together, not separately.

3. Know the early-access rules

The 10% additional tax on retirement plan withdrawals before age 59½ is the classic FIRE obstacle. There are several well-established ways around it, each with its own rules:

• Taxable brokerage first. No age restriction at all, which is why many FIRE plans lean on it for the first years.
• Roth IRA contributions (not earnings) can generally be withdrawn at any time without tax or penalty.
• Roth conversion ladder. Converted amounts can generally be withdrawn penalty-free after a five-year waiting period.
• The “Rule of 55.” If you separate from service in or after the year you turn 55, withdrawals from that employer's 401(k) may avoid the 10% additional tax. It doesn't apply to IRAs.
• Governmental 457(b) plans generally aren't subject to the 10% early-withdrawal tax after separation from service.
• Substantially equal periodic payments (SEPP / 72(t)). A fixed schedule of withdrawals that avoids the penalty, but it's rigid: changing it early can trigger retroactive penalties.

Each of these has fine print. Get the details right before relying on one.

4. Your “spending” and your “income” aren't the same

A subtle point: in retirement, the number that drives your taxes isn't how much you spend; it's how much taxable income you report. If you spend $60,000 drawn from a mix of Roth contributions, cash, and brokerage sales with high cost basis, your taxable income could be far lower. That gap is what lets careful early retirees keep taxes and health premiums low. Your calculator FIRE number should be based on spending, but your tax plan should be based on income.

5. Don't forget state taxes

State income tax treatment of retirement withdrawals, capital gains, and Social Security varies widely. Some states have no income tax; others tax nearly everything. If relocation is part of your plan, model the state picture too, including residency rules for the year you move.

6. Common mistakes I'd watch for

• All eggs in the pre-tax basket. Great deductions while working, but it can leave you with large RMDs later and few levers to control income early.
• Ignoring the health insurance interaction. A Roth conversion that saves a little income tax can cost more in lost premium tax credits. See our health insurance guide.
• Forgetting estimated taxes. No paycheck means no automatic withholding. You may need quarterly estimated payments to avoid underpayment penalties.
• Treating rules as permanent. Brackets, contribution limits, and subsidy rules have changed several times in recent years and will change again. Build a plan that can adapt.

The bottom line

FIRE is a savings problem first and a tax problem second, but the tax problem is where planning pays off for the rest of your life. Hold assets in a mix of buckets, use your low-income years deliberately, know your early-access options, and coordinate everything with your health insurance strategy.

Want to see how your numbers look? Try the FIRE number calculator.

This article is general education and not tax advice. Your situation may differ. Verify current limits and thresholds at IRS.gov and consult a qualified professional.