Retirement planning comes down to three questions: how much should you save, where should you put it, and how will you turn it into income later. The accounts you use, the years you give your money to compound, and your withdrawal strategy in retirement all interact — and small decisions made in your 20s and 30s can be worth hundreds of thousands of dollars by the time you retire.
Retirement account types: 401(k), IRA, and Roth
A 401(k) is an employer-sponsored account that lets you contribute directly from your paycheck, often with an employer match — essentially free money for participating. Traditional 401(k) contributions are made pre-tax, lowering your taxable income today, but withdrawals in retirement are taxed as ordinary income.
An IRA (Individual Retirement Account) works similarly but is opened on your own, outside of an employer, with lower annual contribution limits than a 401(k). Both 401(k)s and IRAs come in 'Roth' versions, where you contribute after-tax dollars but withdrawals — including all investment growth — are completely tax-free in retirement, provided you meet the holding requirements.
Which is better depends on your current vs. expected future tax rate. If you expect to be in a lower bracket in retirement, traditional accounts usually win. If you expect similar or higher rates later — common for younger savers early in their careers — Roth accounts can be more valuable. Many people use a mix of both for tax diversification.
The power of compound growth — and starting early
Compound growth means your investment returns earn their own returns over time. The earlier you start, the more years your money has to compound, and the effect is dramatic: someone who invests $500/month from age 25 to 65 at a 7% return ends up with roughly double the balance of someone who starts the same contributions at age 35 — even though the later starter only contributed 25% less in total. Time in the market, not timing the market, is the single biggest lever most people have. Use the Retirement Savings Calculator to see exactly how your own numbers play out.
Withdrawal strategies: the 4% rule and beyond
The '4% rule' comes from research (the Trinity Study, building on work by financial planner William Bengen) suggesting that withdrawing 4% of your portfolio in your first year of retirement, then adjusting that dollar amount for inflation each year after, has historically had a high probability of lasting 30 years without depleting the portfolio.
It's a starting point, not a guarantee. Some planners now recommend a more conservative 3.5% given lower expected future returns and longer life expectancies, while others use 'dynamic' withdrawal strategies that adjust spending based on market performance — withdrawing less in down years and more in strong years.
The practical takeaway: if you want $60,000/year in retirement income and plan to use a 4% withdrawal rate, you'd target a portfolio of about $1.5 million ($60,000 ÷ 0.04). The Retirement Savings Calculator shows whether your current trajectory gets you there.
Social Security basics
Social Security provides a baseline of guaranteed, inflation-adjusted income in retirement, based on your highest 35 years of earnings. You can claim as early as age 62 (at a permanently reduced benefit), at your 'full retirement age' (66–67 depending on birth year, for full benefits), or as late as age 70 (with benefits increased roughly 8% per year you delay past full retirement age). For most people, Social Security is meant to supplement — not replace — personal retirement savings, which is why the accounts and growth strategies above matter so much.
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Frequently Asked Questions
How much should I have saved for retirement by age 40?+
A common benchmark is 2–3× your annual salary by age 40, though this varies widely by income, lifestyle, and when you started saving. The most useful number is your own trajectory — use the Retirement Savings Calculator with your actual balance and contributions.
Is it better to pay off debt or save for retirement?+
Generally, contribute enough to capture any employer 401(k) match first (it's an instant 100% return), then prioritize high-interest debt (credit cards, often 20%+), then balance additional retirement savings with lower-interest debt like mortgages, which often carry rates below typical investment returns.
What if I can't max out my 401(k) or IRA?+
Contributing something consistently — even 5–10% of your salary — and increasing it over time (especially with raises) compounds significantly more than waiting until you can 'afford to max out.' The calculators on this site can show how even modest increases change your long-term outcome.