Personal Finance Guide

How to Plan for Retirement: IRAs, 401(k)s, and More

By FinancePuzzles Editorial Team·9 min read·IntermediateUpdated May 2025

Retirement planning is fundamentally about answering one question: how do I accumulate enough assets to generate the income I need for the rest of my life, without running out? The tools available — 401(k)s, IRAs, Social Security — are powerful but underutilized. Starting early and understanding the rules makes an enormous difference to the final outcome.

    Key Takeaways: Retirement Planning
    The 4% rule suggests you can withdraw 4% of your portfolio in year one (adjusted for inflation annually) without running out of money over a 30-year retirement.
Delaying Social Security from 62 to 70 increases monthly benefits by approximately 77% — a powerful return for those who can afford to wait.
Required Minimum Distributions (RMDs) begin at age 73 for traditional IRAs and 401(k)s — strategic Roth conversions before 73 can reduce future RMD tax burden.
Sequence of returns risk — experiencing major losses early in retirement — is more damaging than the same losses later, because withdrawals lock in losses permanently.
Catch-up contributions ($7,500 extra to 401k, $1,000 extra to IRA for those 50+) are among the most valuable tax-advantaged opportunities available to late starters.

  

The Core Retirement Accounts

Two account types anchor most American retirement savings. The 401(k) (or 403(b) for nonprofits) is employer-sponsored, allowing contributions of up to $23,000/year ($30,500 if 50+) with automatic payroll deductions and potential employer matching. The IRA (Individual Retirement Account) allows $7,000/year ($8,000 if 50+) with more investment flexibility. Both come in traditional (pre-tax contributions, taxed on withdrawal) and Roth (after-tax contributions, tax-free withdrawal) versions.

Real example: An employee who contributes 6% of a $75,000 salary ($4,500/year) to their 401(k) and receives a 50% employer match on the first 6% gets an additional $2,250/year — a 50% instant return on their contribution. Invested in a low-cost target-date fund for 30 years at 8% returns, this $6,750/year becomes approximately $765,000 at retirement.

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The 4% Rule and Safe Withdrawal Rates

The foundational question of retirement finance: how much can you spend annually without outliving your money? Financial planner William Bengen's 1994 research examined historical returns from 1926 onward. His finding: withdrawing 4% of the portfolio in year one, then adjusting for inflation annually, sustained portfolios for 30+ years in every historical scenario — including the Great Depression and 1970s stagflation. This became known as the "4% rule." A $1 million portfolio supports $40,000/year in initial withdrawals.

Real example: A couple retiring in 2000 with $1 million using the 4% rule would have withdrawn $40,000 in 2000, seen their portfolio fall dramatically in 2000–2002 and 2008–2009, and still had money remaining 30 years later — thanks to recoveries in intervening years. This worst-case historical scenario validates the rule, though some planners now recommend 3.5% for retirements exceeding 35 years.

Social Security Claiming Strategy

Social Security represents one of the most consequential financial decisions of retirement: when to claim. Benefits can start at 62 (permanently reduced by up to 30%), at Full Retirement Age (67 for those born after 1960) for full benefits, or delayed until 70 (benefits increase 8% per year beyond FRA). For someone entitled to $2,000/month at 67, claiming at 62 yields $1,400/month; waiting to 70 yields $2,480/month — a permanent 77% increase. The breakeven age is approximately 80.

Real example: A healthy 62-year-old deciding whether to claim Social Security early or wait to 70 can frame it as: taking $1,400/month starting at 62 vs. $2,480/month starting at 70. The 8-year wait costs $134,400 in foregone benefits (96 months × $1,400). After 70, the $1,080/month difference pays back the wait in approximately 10 years (age 80). Every month lived past 80 generates $1,080 in additional annual income from the delayed claiming.

Sequence of Returns Risk: The Retirement Surprise

During accumulation, the order of returns doesn't matter — what matters is the average return over time. In retirement, the order matters enormously. Sequence of returns risk means experiencing major portfolio losses in the first few years of retirement can be catastrophic — you're withdrawing funds during declines, locking in losses and reducing the base that can recover. Mitigations include maintaining 1–2 years of expenses in cash or short-term bonds (a "buffer"), dynamic withdrawal strategies (spending less in down years), and delaying Social Security to reduce portfolio dependence.

Frequently Asked Questions

How much do I need to retire?

The standard calculation: multiply your expected annual retirement spending by 25 (derived from the 4% rule). If you plan to spend $60,000/year and expect $24,000/year from Social Security, you need $36,000/year from your portfolio — requiring $900,000 in savings ($36,000 × 25). For earlier retirement (age 55), the multiple should be 30× or higher to account for a longer drawdown period.

What are Required Minimum Distributions (RMDs)?

RMDs are mandatory annual withdrawals from tax-deferred accounts (Traditional IRA, 401k) starting at age 73 under the SECURE 2.0 Act. The IRS calculates the amount by dividing your prior year-end account balance by a life expectancy factor. RMDs are taxed as ordinary income, potentially pushing retirees into higher brackets. Roth IRAs are exempt from RMDs during the owner's lifetime — a key advantage for estate planning.

Should I convert my IRA to Roth before retirement?

Roth conversions — moving money from a traditional IRA to a Roth — make sense during low-income years. The converted amount is taxed as ordinary income that year, but grows and withdraws tax-free forever after. The optimal window is typically between retirement (when income drops) and when Social Security and RMDs begin (which raise income again). Strategic annual conversions up to the top of the 22% or 24% bracket can dramatically reduce lifetime tax bills.