Retirement planning is really two problems: accumulating enough, and not running out once you stop working. Most guides focus almost entirely on the first — but the decumulation phase is where mistakes are both most common and least recoverable.
This guide covers the full retirement arc. Whether you are 25 and want to retire at 40 under FIRE principles, 45 and playing catch-up, or 60 and trying to optimize Social Security claiming, the math that governs your outcome is the same.
Throughout, we link to the specific calculators that let you pressure-test assumptions — returns, inflation, tax brackets, withdrawal order — instead of relying on a single "retirement score" number that hides every interesting tradeoff.
The classic rule is 25× your annual spending: if you need $60,000/year, you need roughly $1.5M. This comes from the "4% rule" Trinity Study, which found a 4% initial withdrawal (adjusted yearly for inflation) survived 30-year retirements in nearly all historical periods.
FIRE (Financial Independence, Retire Early) tightens this to 3.25–3.5% because the retirement horizon stretches to 50+ years, and Coast FIRE flips it: save aggressively until compound growth alone covers you by age 65.
Start with actual spending, not replacement-rate shortcuts. Most planners use 70–80% of pre-retirement income, but retirees often spend more in the first decade (travel, healthcare) and less later — a "go-go, slow-go, no-go" pattern.
The order of account usage matters nearly as much as the amount saved. The standard hierarchy: 401(k) up to the employer match, then max a Roth or traditional IRA, then back to the 401(k) up to the annual limit ($23,500 in 2025, plus $7,500 catch-up at 50+).
Roth vs. traditional comes down to your current tax bracket versus your expected retirement bracket. Young, lower-income workers almost always favor Roth; higher earners in their 40s and 50s often lean traditional to get the deduction now.
The Mega Backdoor Roth and Backdoor Roth strategies allow high earners to move $30,000–$70,000 per year into Roth space, bypassing income limits entirely. They are underused because they are poorly explained.
A common benchmark is 25× your annual spending — so $60k/year needs about $1.5M invested. Adjust down for Social Security and pensions, up for early retirement.
Capture the full 401(k) match first, then max an IRA, then return to the 401(k). The match is an instant 50–100% return.
Roth wins if your current tax bracket is lower than your expected retirement bracket. Traditional wins if the opposite. Most 20s-30s workers should tilt Roth.
Withdraw 4% of your portfolio in year one, then adjust that dollar amount by inflation each year. Historically, this lasted 30+ years in nearly every market scenario.
If you expect average or better longevity and can afford to delay, waiting to 70 increases lifetime benefits by roughly 77% versus claiming at 62.
Saving enough by a certain age that compound growth alone covers retirement, with zero new contributions needed. You "coast" to 65.
Not on traditional IRA/401(k) balances after 73, but Roth IRAs have no RMDs, so strategic Roth conversions in your 60s can shrink future RMDs dramatically.
Yes, via Rule of 55 (from an active 401(k)), 72(t) Substantially Equal Periodic Payments, or a Roth conversion ladder.
HSAs are the most tax-advantaged account in the US code (triple-tax-free if used for medical). Max an HSA before a second non-match 401(k) dollar.
A 3% inflation rate halves purchasing power in 24 years. Your withdrawal plan must index to inflation, and your portfolio must include inflation-sensitive assets.
3. Social Security and Decumulation
Every year you delay claiming Social Security past age 62 raises your benefit by 7–8%, up to age 70. That is a historically reliable, inflation-adjusted return no other asset can match.
The catch: you need a bridge strategy to fund spending between retirement and your claiming age. Roth conversions during those gap years are often the single highest-impact decision a retiree makes.
Required Minimum Distributions (RMDs) start at age 73, forcing taxable withdrawals even if you do not need the money. Planning for RMDs at 60 — by Roth-converting strategically — can cut six-figure amounts from your lifetime tax bill.