Retirement in the United States involves more moving parts than in most countries: a voluntary workplace savings system, a government benefit tied to your earnings history, an IRS-mandated distribution schedule, and a healthcare system that shifts significant costs onto retirees. This guide walks through each step in the order you should tackle them, with specific numbers for 2026 and links to calculators that do the arithmetic for you.
Key Terms
- 401(k): an employer-sponsored defined-contribution retirement plan funded with pre-tax or Roth after-tax contributions, with 2026 employee limits of $23,500 (under 50) and $31,000 (50+).
- Roth IRA: an individual retirement account funded with after-tax dollars; qualified withdrawals in retirement are completely tax-free, including all growth.
- Traditional IRA: an individual retirement account funded with pre-tax or non-deductible after-tax dollars; withdrawals in retirement are taxed as ordinary income.
- RMD, Required Minimum Distribution: the annual withdrawal the IRS requires from Traditional 401(k) and IRA accounts beginning at age 73, calculated using account balance and IRS life expectancy tables.
- Social Security: a federal program that pays monthly retirement benefits based on your 35 highest-earning years of covered employment; benefit amounts vary with the age at which you claim.
Step 1: Estimate How Much You Need to Retire
Every retirement plan starts with a target number. Without one, there's no way to know whether you're saving enough, investing correctly, or on track to retire at your chosen age.
The most widely cited framework is the 4% rule: divide your expected annual retirement spending by 0.04 to find the corpus you need. Plan to spend $60,000 a year and the math is $60,000 / 0.04, which comes to $1.5 million. This figure represents the portfolio size at which a 4% annual withdrawal, adjusted for inflation each year, has historically lasted at least 30 years across most market environments.
The 4% rule is a starting point, not a guarantee. A few factors push the required corpus higher. Retiring at 55 instead of 65 means funding 35 to 40 years rather than 25 to 30, and a 3.3 to 3.5% withdrawal rate suits early retirees better. Retirees under 65 also have to buy private insurance before Medicare eligibility kicks in, adding $12,000 to $20,000 a year in premiums and out-of-pocket costs. And sequence-of-returns risk means a market downturn in the first five years of retirement can permanently impair a portfolio, even when long-term average returns look healthy.
Other factors reduce the required corpus. If Social Security pays $24,000 a year, your portfolio only needs to generate the remaining $36,000, a corpus of $900,000 at 4%. Pension or rental income reduces portfolio dependency further. And retirees who can trim discretionary spending during downturns meaningfully improve their odds of the money lasting.
Use the Retirement Calculator to build a personalized model. Input your current age, current retirement savings balance, monthly or annual savings rate, expected investment return, target retirement age, and estimated monthly expenses in retirement. The calculator projects your corpus at retirement age and shows whether you'll hit your target, and by how much you overshoot or fall short. Adjust the inputs iteratively; even a small increase in monthly contribution or a two-year delay in retirement age can close a large gap.
A useful secondary check is the savings rate benchmark. Saving 15% of gross income from your 20s, including employer contributions, is roughly the threshold at which average earners can retire at 65 with 70 to 80% income replacement. Start later and the required savings rate climbs steeply; saving 25 to 30% of gross income isn't unusual for workers who begin seriously saving in their 40s.
Step 2: Maximize Your 401(k)
The 401(k) is the cornerstone of workplace retirement savings in the US. It offers tax deferral on growth, a reduced taxable income today (Traditional 401(k)) or tax-free withdrawals later (Roth 401(k)), and the employer match, stacked on top of each other.
2026 Contribution Limits
| Age Group | Employee Limit | Employer + Employee Combined Limit |
|---|---|---|
| Under 50 | $23,500 | $70,000 |
| 50-59 and 64+ | $31,000 | $77,500 |
| 60-63 (SECURE 2.0 super catch-up) | $34,750 | $81,250 |
The average employer match in US corporate plans is 50 cents for every dollar contributed, up to 6% of salary. On a $100,000 salary, contributing 6% ($6,000) earns an additional $3,000 in employer contributions, an immediate 50% return before any investment gains even start compounding. It's the single biggest lever available to any retirement saver.
Failing to contribute at least 6% when an employer matches up to 6% means leaving part of your salary on the table. Prioritize the match above every other savings vehicle, IRAs included.
Use the 401(k) Calculator to model the long-term impact of your contributions. A 35-year-old contributing $1,500 a month (employee plus employer combined) at a 7% annual return accumulates approximately $1.6 million by age 65. Bump that to $2,000 a month, achievable by maxing the employee contribution on a $100,000-plus salary, and the projection climbs to roughly $2.1 million. That extra $500 a month produces an additional $500,000 in corpus because compound growth amplifies every incremental dollar saved early.
Most employers now offer both Traditional and Roth options within the same plan. Traditional contributions reduce taxable income today; Roth contributions use after-tax money but all future growth and withdrawals come out tax-free. The decision rule matches the Roth vs Traditional IRA choice covered in Step 3: expect a higher marginal tax rate at retirement than today, and Roth wins. Young workers in lower brackets benefit most from locking in current tax rates via Roth contributions.
Step 3: Choose Roth vs Traditional IRA
After capturing the full 401(k) match, an IRA is the next best vehicle. The 2026 IRA contribution limit is $7,000 a year, rising to $8,000 for workers aged 50 and older.
A Traditional IRA may allow a tax deduction on contributions (subject to income limits if you also have a workplace plan), grows tax-deferred, and gets taxed as ordinary income at withdrawal. A Roth IRA uses after-tax contributions, grows completely tax-free, and qualified withdrawals, including all earnings, are never taxed. Roth IRAs also carry no Required Minimum Distributions during the owner's lifetime, which makes them powerful estate-planning tools.
Roth IRA Income Limits (2026)
| Filing Status | Phase-Out Range | Ineligible Above |
|---|---|---|
| Single | $150,000-$165,000 MAGI | $165,000 |
| Married filing jointly | $236,000-$246,000 MAGI | $246,000 |
If your income exceeds these limits, a backdoor Roth IRA, making a non-deductible Traditional IRA contribution and immediately converting it to Roth, remains a legal strategy for high earners, though it requires careful documentation.
Use the Roth vs Traditional IRA Calculator to compare the after-tax value at retirement under different assumptions. The decision comes down to one question: will your marginal tax rate be higher now or at retirement?
Roth tends to win if you're in a lower tax bracket today than you expect at retirement, common for younger workers, people mid-career with temporarily reduced income, or anyone expecting significant RMDs from large Traditional accounts. Traditional tends to win if you're in a peak-income year today and expect a materially lower rate in retirement, common for workers in their 50s approaching their highest earning years.
When you're unsure which applies, splitting contributions between Traditional and Roth preserves flexibility to manage taxable income in retirement strategically.
Step 4: Estimate Your Social Security Benefits
Social Security is a defined benefit paid by the federal government, calculated from your 35 highest-earning years of covered employment. Years with zero earnings count as zeros, which is why gaps in employment history, caregiving, extended education, self-employment outside the system, can meaningfully reduce your benefit.
The Social Security Administration converts your earnings history into an Average Indexed Monthly Earnings figure, then applies a progressive formula to produce your Primary Insurance Amount, the monthly benefit you receive if you claim at your Full Retirement Age. For workers born in 1960 or later, FRA is 67.
Claiming Age and Benefit Size
| Claiming Age | Benefit Relative to FRA |
|---|---|
| 62 (earliest) | Reduced by up to 30% |
| Full Retirement Age (67) | 100% (base benefit) |
| 70 (latest for credits) | Increased by approximately 24% |
Delaying from 62 to 70 increases the monthly benefit by roughly 77%. The breakeven age, the point where total lifetime benefits equal out regardless of claiming age, typically falls in the late 70s. Good health and family longevity on your side make delaying to 70 almost always the better math.
A spouse who earned less is entitled to up to 50% of the higher earner's FRA benefit, whichever turns out greater, their own earned benefit or the spousal benefit. Survivor benefits let a widow or widower claim 100% of the deceased spouse's benefit. Coordinating claiming ages between spouses, often having the higher earner delay to 70, maximizes lifetime household Social Security income.
Use the Social Security Calculator to model your projected benefit at different claiming ages and see how coordinating with a spouse's benefit affects total household income.
Step 5: Set Your Asset Allocation
Asset allocation, the split between equities, bonds, and other asset classes, is the single largest driver of long-term portfolio returns and year-to-year volatility. Getting it right for your age and risk tolerance matters more than picking individual funds.
A classic starting heuristic subtracts your age from 110 to get your equity allocation percentage. A 40-year-old would hold 70% in stocks and 30% in bonds. This rule of thumb adjusts automatically as you age, shifting toward more stable fixed income as retirement approaches. More aggressive versions use 120 or even 125 minus age, reflecting longer life expectancies and the need for portfolios to grow well into a 25 to 30 year retirement. More conservative investors stick with 100 minus age.
During the accumulation phase, your 20s through 50s, equity-heavy portfolios (70 to 90% stocks) maximize long-term growth, since short-term volatility barely matters when you're not drawing on the portfolio. Low-cost index funds tracking the total US market, international equity, and bond indexes form an efficient core.
In the transition phase, roughly 55 to 65, start reducing equity exposure and build a cash or short-bond buffer covering 1 to 2 years of living expenses. That cushion means you never have to sell equities at depressed prices to fund withdrawals.
In the distribution phase, 65 and beyond, a 50 to 60% equity allocation maintains growth potential while cutting volatility. Bucket strategies, dividing the portfolio into short-term (cash), medium-term (bonds), and long-term (equities) buckets, offer psychological comfort along with structural discipline.
If you'd rather have a single-fund solution, target-date funds (a 2045 Fund for someone planning to retire in 2045, say) automatically shift allocation from aggressive to conservative on a glidepath. They're widely available in 401(k) plans and work well for investors who don't want to manage allocation themselves. Check the expense ratio; it should sit below 0.20% for index-based target-date funds from major providers.
Use the Inflation Calculator to understand how inflation erodes real returns. A nominal 7% return with 3% inflation nets out to a real return of roughly 4%, and that's the figure your retirement projections should be built on, not the nominal one.
Step 6: Plan Your Required Minimum Distributions
Once you turn 73, the IRS requires you to start withdrawing minimum amounts each year from Traditional 401(k) and IRA accounts. These are Required Minimum Distributions, and missing the deadline triggers a 25% excise tax on the shortfall (reduced from 50% by SECURE Act 2.0).
The IRS formula is straightforward: RMD equals your prior December 31 account balance divided by an IRS life expectancy factor.
The life expectancy factor comes from the Uniform Lifetime Table. At age 73, the factor is 26.5; at 80, it falls to 20.2; at 85, to 16.0. As the divisor shrinks, the RMD grows as a percentage of the account balance.
For example, a $1 million Traditional IRA at age 73 produces an RMD of $1,000,000 / 26.5, which comes to $37,736. At age 80, that same balance (assuming no growth) would generate an RMD of $1,000,000 / 20.2, or $49,505.
Use the RMD Calculator to project your annual distributions, understand the tax impact, and plan your withdrawal sequencing across multiple accounts.
RMDs get taxed as ordinary income. Large RMDs can push retirees into higher tax brackets, trigger Medicare Income-Related Monthly Adjustment Amounts on Part B and Part D premiums, and cause a greater portion of Social Security benefits to become taxable (up to 85% of benefits are taxable above certain income thresholds).
Roth conversions before age 73 are the most effective tool for managing future RMD size. Converting Traditional IRA or 401(k) balances to Roth in the years between retirement and age 73, often a low-income window, shrinks the Traditional account balance that would otherwise generate RMDs, taxes the conversion at potentially lower rates, and leaves you with a tax-free Roth account that carries no RMDs during your lifetime.
Roth IRAs aren't subject to RMDs during the original account owner's lifetime, which makes them ideal accounts to hold as long as possible, letting compounding continue tax-free. Inherited Roth IRAs are subject to the 10-year rule for non-spouse beneficiaries under current law.
Putting It All Together: A Retirement Checklist
Work through these actions in priority order regardless of your age:
- Contribute to your 401(k) up to the full employer match before anything else.
- Fund a Roth or Traditional IRA to the annual limit, $7,000 or $8,000 in 2026.
- Return to your 401(k) and increase to the annual employee limit, $23,500 or $31,000.
- Model your Social Security claiming strategy using the Social Security Calculator and coordinate with your spouse.
- Review asset allocation annually and rebalance if equity/bond splits drift more than 5% from target.
- Project RMDs at age 73 using the RMD Calculator and plan Roth conversions in low-income years before 73.
- Run a full retirement projection with the Retirement Calculator at least once a year, updating for actual savings balances and revised spending estimates.
The accounts, limits, and tax rules governing US retirement savings reward consistent action over many years. Starting early and adjusting the plan annually beats any attempt to optimize a single year's decisions. The calculators linked throughout this guide let you run the numbers yourself, so every decision rests on your actual situation rather than generic rules of thumb.