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, you cannot know whether you are 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. If you plan to spend $60,000 per year, the calculation is $60,000 ÷ 0.04 = $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. Several factors push the required corpus higher:
- Longer retirement horizon. Retiring at 55 instead of 65 means funding 35–40 years rather than 25–30. A 3.3–3.5% withdrawal rate is more appropriate for early retirees.
- Higher healthcare costs. Retirees under 65 must purchase private insurance before Medicare eligibility, adding $12,000–$20,000 per year in premiums and out-of-pocket costs.
- Sequence-of-returns risk. A market downturn in the first five years of retirement can permanently impair a portfolio, even if long-term average returns are healthy.
Factors that reduce the required corpus:
- Social Security income. If Social Security will pay $24,000 per year, your portfolio only needs to generate the remaining $36,000 — a corpus of $900,000 at 4%.
- Pension or rental income. Any guaranteed income reduces portfolio dependency.
- Flexible spending. Retirees who can cut discretionary spending during downturns significantly improve survival probability.
Use the Retirement Calculator to build a personalised 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 will hit your target — and by how much you overshoot or fall short. Adjust the inputs iteratively: even small increases 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, inclusive of employer contributions, is the threshold at which most average earners can retire at 65 with 70–80% income replacement. If you started later, the required savings rate rises steeply — saving 25–30% of gross income is not 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 three compounding advantages over a taxable brokerage account: tax deferral on growth, a reduced taxable income today (Traditional 401(k)) or tax-free withdrawals later (Roth 401(k)), and the employer match.
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 |
Always Capture the Full Employer Match First
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. This is the single most powerful leverage point available to any retirement saver.
Failing to contribute at least 6% when an employer matches up to 6% is equivalent to leaving part of your salary on the table. Prioritise the match above all other savings vehicles including IRAs.
Projecting Your 401(k) Corpus
Use the 401(k) Calculator to model the long-term impact of your contributions. A 35-year-old contributing $1,500 per month (employee + employer combined) with a 7% annual return will accumulate approximately $1.6 million by age 65. Increasing that to $2,000 per month — achievable by maximising the employee contribution on a $100,000+ salary — projects to roughly $2.1 million. The difference of $500 per month in contributions produces an additional $500,000 in corpus because compound growth amplifies every incremental dollar saved early.
Traditional vs Roth 401(k)
Most employers now offer both options within the same plan. Traditional contributions reduce taxable income today; Roth contributions use after-tax money but all future growth and withdrawals are tax-free. The decision rule is identical to the Roth vs Traditional IRA choice covered in Step 3: if you expect a higher marginal tax rate at retirement than today, Roth is better. 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 per year, rising to $8,000 for workers aged 50 and older.
How Each Account Works
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 is 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 have no Required Minimum Distributions during the owner's lifetime, making 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.
Which Is Better?
Use the Roth vs Traditional IRA Calculator to compare the after-tax value at retirement under different assumptions. The decision hinges on a single question: will your marginal tax rate be higher now or at retirement?
- Roth wins if you are in a lower tax bracket today than you expect to be at retirement — common for younger workers, people mid-career with temporarily reduced income, or anyone expecting significant RMDs from large Traditional accounts.
- Traditional wins if you are 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 uncertain, splitting contributions between Traditional and Roth (tax diversification) 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 are counted as zeros, which is why gaps in employment history — caregiving, extended education, self-employment outside the system — can reduce your benefit significantly.
How the Benefit Amount Is Determined
The Social Security Administration converts your earnings history into an Average Indexed Monthly Earnings (AIME) figure, then applies a progressive formula to produce your Primary Insurance Amount (PIA) — the monthly benefit you receive if you claim at your Full Retirement Age (FRA). 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 at which total lifetime benefits are equal regardless of claiming age — is typically the late 70s. If you are in good health and have family longevity on your side, delaying to 70 is almost always the mathematically superior choice.
Spousal and Survivor Benefits
A spouse who earned less is entitled to up to 50% of the higher earner's FRA benefit, whichever is greater — their own earned benefit or the spousal benefit. Survivor benefits allow a widow or widower to claim 100% of the deceased spouse's benefit. Coordinating claiming ages between spouses — often having the higher earner delay to 70 — maximises lifetime household Social Security income.
Use the Social Security Calculator to model your projected benefit at different claiming ages and to 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 is more important than picking individual funds.
The 110-Minus-Age Rule
A classic starting heuristic: subtract 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 25–30 year retirement. More conservative investors stick with 100 minus age.
Lifecycle of Allocation
Accumulation phase (20s–50s): Equity-heavy portfolios (70–90% stocks) maximise long-term growth. Short-term volatility is irrelevant because you are not drawing on the portfolio. Low-cost index funds tracking total US market, international equity, and bond indexes form an efficient core.
Transition phase (55–65): Begin reducing equity exposure and building a cash or short-bond buffer of 1–2 years of living expenses. This cushion means you never need to sell equities at depressed prices to fund withdrawals.
Distribution phase (65+): A 50–60% equity allocation maintains growth potential while reducing volatility. "Bucket strategies" — dividing the portfolio into short-term (cash), medium-term (bonds), and long-term (equities) buckets — provide psychological comfort and structural discipline.
Target-Date Funds
If you prefer a single-fund solution, target-date funds (e.g., a 2045 Fund for someone planning to retire in 2045) automatically adjust allocation from aggressive to conservative on a glidepath. They are widely available in 401(k) plans and are appropriate for investors who do not want to manage allocation themselves. Check the expense ratio — it should be 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 is a real return of roughly 4% — the figure your retirement projections should be built on, not the nominal figure.
Step 6: Plan Your Required Minimum Distributions
Once you turn 73, the IRS requires you to begin withdrawing minimum amounts each year from Traditional 401(k) and IRA accounts. These are Required Minimum Distributions, and failing to take them on time results in a 25% excise tax on the shortfall (reduced from 50% by SECURE Act 2.0).
How RMDs Are Calculated
The IRS formula is straightforward:
RMD = Prior December 31 Account Balance ÷ 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.
Example: A $1 million Traditional IRA at age 73 produces an RMD of $1,000,000 ÷ 26.5 = $37,736. At age 80, the same balance (assuming no growth) would generate an RMD of $1,000,000 ÷ 20.2 = $49,505.
Use the RMD Calculator to project your annual distributions, understand the tax impact, and plan your withdrawal sequencing across multiple accounts.
RMDs and Tax Planning
RMDs are taxed as ordinary income. Large RMDs can push retirees into higher tax brackets, trigger Medicare Income-Related Monthly Adjustment Amounts (IRMAA surcharges 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. By converting Traditional IRA or 401(k) balances to Roth in the years between retirement and age 73 — often a low-income window — you reduce the Traditional account balance that will generate RMDs, pay tax at potentially lower rates, and produce a tax-free Roth account that has no RMDs during your lifetime.
Roth IRA Exception
Roth IRAs are not subject to RMDs during the original account owner's lifetime. This makes them ideal accounts to hold for as long as possible, allowing compounding to 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 401(k) up to the full employer match — do this 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 — use 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 per 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 produces far better outcomes than any attempt to optimise a single year's decisions. The calculators linked throughout this guide let you run the numbers yourself so that every decision is grounded in your actual situation rather than generic rules of thumb.