🏖️Retirement
Retirement sounds like a problem for old people, which is exactly why young people get the math so wrong. The reality is that retirement is one of the few financial outcomes that is almost entirely decided by what you do in your 20s and 30s, not your 50s and 60s. The reason is compound interest: a dollar invested at 25 becomes roughly $21 at 65 assuming 8% returns. The same dollar invested at 45 becomes roughly $4.66. Twenty years of additional compounding more than quintuples your money. This is not a marketing trick or a financial advisor talking point — it is just exponential math. The 401(k), introduced in IRS code section 401(k) in 1978 and popularized by Ted Benna in the early 1980s, transformed American retirement by shifting responsibility from employer pensions (defined benefit) to employee-managed accounts (defined contribution). That shift has been kind to disciplined savers and brutal to everyone else. Today, the median 65-year-old American has roughly $200,000 in retirement savings — a number that funds maybe 4-6 years of modest living before falling back on Social Security alone. The fix is not complicated, but it is unforgiving of delay: contribute consistently to tax-advantaged accounts, invest in low-cost index funds, ignore the noise, and let 30-40 years do the heavy lifting. This page is the playbook. Run a poll on moomz asking your friends how much they have in retirement — most people genuinely have no idea where they stand.
The account stack: 401(k), IRA, HSA, and what to do in what order
The 2026 contribution limits: 401(k) $23,500 (plus $7,500 catch-up if 50+), IRA $7,000 ($8,000 if 50+), HSA $4,300 individual or $8,550 family if you have a high-deductible health plan. The optimal order for most workers: 1) Contribute to 401(k) up to full employer match — this is free money, typically a 50-100% instant return. 2) Max HSA if eligible — triple tax advantage (deductible going in, growth tax-free, withdrawals tax-free for medical), the single best account in the US tax code. 3) Max Roth IRA — $7,000/year of tax-free growth forever, contributable until April 15 of the following year. 4) Return to 401(k) and max it out — $23,500/year of pre-tax (Traditional) or after-tax (Roth 401(k)) growth. 5) Beyond that, taxable brokerage with low-cost index funds. Roth vs Traditional: Roth wins if you expect higher taxes in retirement than today (true for most young people), Traditional wins if you expect lower taxes in retirement. When uncertain, split 50/50. Backdoor Roth IRA is available for high earners over the direct contribution limit and is fully legal as of 2026, though the strategy is occasionally targeted by Congressional proposals.
How much do you actually need to retire?
The shortcut answer: 25 times your annual expenses. If you live on $50,000/year, you need roughly $1.25 million. If you live on $100,000/year, you need $2.5 million. This is the famous 4% rule, based on the Trinity Study (1998) and updated research by Wade Pfau and others, which found that withdrawing 4% of a balanced portfolio annually, adjusted for inflation, has historically lasted 30+ years in nearly all rolling periods including the Great Depression and stagflation. Refinements suggest 3.5-3.7% is safer for 40+ year early-retirement windows and 4.5-5% is fine for 25-year traditional retirements. Subtract Social Security from your annual need: the average 2026 benefit is around $1,950/month or $23,400/year for a typical worker. So if your expenses are $50k and Social Security covers $23k, you actually need to fund $27k from your portfolio, meaning $675,000 (27k × 25). The math gets dramatically easier once you account for Social Security, paid-off housing, and reduced expenses in retirement. The FIRE movement (Financial Independence, Retire Early) pushes 50-70% savings rates to retire in the 30s or 40s — extreme but mathematically sound for people willing to live below their means now.
How to invest a retirement account so you do not need to think about it
The simplest evidence-based portfolio for retirement: a target-date fund matching your expected retirement year (Vanguard VTIVX for 2055, VTHRX for 2030, etc.). One fund, automatically rebalanced, gradually shifts from stocks to bonds as you age, expense ratio around 0.08%. Done. The slightly more advanced version: 80-90% total stock market (VTI + VXUS or just VT) + 10-20% bonds (BND), held across whatever accounts you have, rebalanced annually. Avoid: target-date funds with high expense ratios (over 0.50%) common in older 401(k) plans, individual stocks in retirement accounts (the volatility-adjusted return is worse), borrowing from your 401(k) for anything short of preventing foreclosure, withdrawing from retirement accounts before 59 1/2 (10% penalty plus ordinary income tax, devastating to long-term compounding). Set contributions to auto-escalate 1% per year alongside raises if your plan supports it — Save More Tomorrow research from Thaler and Benartzi shows this passive mechanism dramatically improves retirement outcomes.
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Frequently asked
Q.When was the 401(k) created?+
Section 401(k) was added to the US Internal Revenue Code in the Revenue Act of 1978, but it was Ted Benna, a benefits consultant at Johnson Companies, who in 1980 first interpreted the provision as a way to let employees defer income tax on contributions to a retirement account. The IRS approved the interpretation in 1981. Within a decade, 401(k) plans largely replaced traditional defined-benefit pensions across corporate America, shifting investment responsibility from employer to employee.
Q.How much should I contribute to my 401(k)?+
At minimum, contribute enough to capture the full employer match — this is free money, often 3-6% of salary. Beyond the match, aim for 10-15% of gross income across all retirement accounts (401(k), IRA, HSA combined) if you started in your 20s, 15-20% if you started in your 30s, and 25%+ if you started in your 40s. The 2026 401(k) contribution limit is $23,500, or $31,000 including catch-up contributions if you are 50 or older.
Q.Roth or Traditional 401(k)?+
Roth wins if you expect higher tax rates in retirement than today, which is true for most young workers in low or middle tax brackets. Traditional wins if you expect lower tax rates in retirement (high earners in peak years, planning to move to a no-income-tax state in retirement). When uncertain, split contributions 50/50 — this hedges your bet against future tax policy and gives you withdrawal flexibility in retirement. Mega backdoor Roth (after-tax contributions converted to Roth) is available in some plans for high earners and is extremely powerful.
Q.Can I retire early?+
Yes, if you save aggressively. The FIRE movement targets 25-30 times annual expenses invested in low-cost index funds, achievable in 10-20 years at 50-70% savings rates. The math: at a 50% savings rate, you need roughly 17 years to reach financial independence from zero. At 70%, around 9 years. The catch is sustained discipline and a willingness to live below current means. Geographic arbitrage (earning a US salary while living somewhere cheaper) accelerates the timeline dramatically. Early retirement requires more conservative withdrawal rates (3.3-3.7%) than traditional 30-year retirement plans.