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401(k) Calculator 2026 | Retirement Savings, Employer Match & ROTH Scenarios

Calculate 401(k) retirement savings with employer matching, annual contributions, investment returns, and ROTH conversion impacts. Estimate your retirement portfolio value at retirement age with IRS contribution limits updated for 2026. See how employer match accelerates wealth-building.

✓ Last updated: March 2026 | Built with CRA-official rates, Bank of Canada data, and OSFI guidelines

How to Use This Calculator

Enter your US salary and starting balance

Begin with your current gross annual salary in US dollars and, if applicable, the balance already accumulated across your 401(k) accounts.

Set your employee and employer contributions

Choose the percentage of salary you contribute and how much your US employer matches, up to the stated match limit. The engine automatically checks against IRS-style annual limits.

Configure growth, inflation, and taxes

Select expected annual investment return, long-run US inflation, salary growth, contribution step-ups, and an approximate state income tax rate to model after-tax retirement outcomes.

Review Traditional vs Roth projections

The calculator produces a full year-by-year 401(k) projection, compares Traditional and Roth after-tax values, and shows an inflation-adjusted balance in today's dollars.

Understanding Your Results

Projected 401(k) Balance
Estimated value of your US 401(k) plan at your chosen retirement age, net of the expense ratio you entered, assuming contributions and investment returns follow the inputs you provided.
Total Contributions
Total dollars contributed by you and your employer over the full projection period, before investment growth.
Investment Growth (net of fees)
Compound growth from US and global investments held in your plan, after subtracting your fund expense ratio and plan administration fees each year. Even a 0.5% annual fee reduces a 30-year result significantly.
Inflation-Adjusted Value
Your projected balance converted into today's US dollars using the inflation rate you selected, which helps you understand real retirement purchasing power.
Estimated Monthly Retirement Income (4% Rule)
Applies the widely used 4% Sustainable Withdrawal Rate (SWR) to your projected after-tax balance, divided by 12, to estimate sustainable monthly income in retirement. This rule of thumb — from Bengen (1994) — is a starting point, not a guarantee.
Traditional vs Roth 401(k) After-Tax Delta
The difference between the estimated after-tax value of a Roth 401(k) and a Traditional 401(k), using simplified tax rate assumptions. A positive number means Roth comes out ahead after taxes under these assumptions; a negative number favors Traditional.

Key Tips

  • ✓
    In the United States, try to contribute at least enough to receive the full employer match – turning down a match is usually leaving guaranteed compensation on the table.
  • ✓
    Schedule automatic 1–2 percentage point increases in your 401(k) contribution rate each year as your US salary grows, especially after raises or bonuses.
  • ✓
    Starting contributions in your 20s or early 30s can lead to significantly higher 401(k) balances at retirement because compound growth has more years to work.
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    Keep your 401(k) invested in a diversified mix of stocks and bonds appropriate for your risk tolerance and age; avoid concentrating too much in your employer's stock.
  • ✓
    Review your contribution level at least once a year or whenever your income or US tax situation changes, especially if IRS 401(k) contribution limits increase.
  • ✓
    Choose low-cost index funds whenever available in your plan. Even reducing your expense ratio from 1.0% to 0.1% can add tens of thousands of dollars to your 401(k) balance over a 30-year career — enter different expense ratios into the calculator to see the impact.
  • ✓
    Under SECURE 2.0 (effective 2025), if you are between ages 60 and 63, you qualify for a larger "super catch-up" contribution limit of $11,250 instead of the standard $7,500 catch-up for other participants aged 50 and over. Use these peak earning years to accelerate savings.

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US 401(k) Calculator – In-Depth Retirement Planning Guide (2026)

How this US 401(k) calculator works

This US 401(k) calculator models your retirement savings by combining several core inputs: your current 401(k) balance (if any), your annual salary in US dollars, the percentage of pay you contribute, your employer's match formula, expected investment return, projected salary growth, and the number of years until retirement. For each year between your current age and retirement age, the engine: - Estimates your salary for that year based on the salary growth rate you choose. - Applies your employee contribution rate to that salary, subject to projected IRS-style elective deferral and total contribution limits. - Calculates your employer's matching contribution using the match rate and match limit you provide, again constrained by a conservative total 401(k) limit. - Adds employee and employer contributions to your opening balance, then applies your expected annual rate of return to grow the account for that year. By repeating this process for every year until retirement, the calculator produces a year-by-year projection of your 401(k) balance, total contributions, and investment growth. You can also specify a state income tax rate to approximate the combined impact of US federal and state taxes on your Traditional 401(k) withdrawals versus Roth-style after-tax savings.

Formulas behind the 401(k) projection

Under the hood, this US 401(k) calculator uses standard time-value-of-money and compounding formulas that financial planners apply every day. At a high level, the ending balance for each year is: Ending balance = (Opening balance + Total contributions) × (1 + r_net) where r_net = Annual return % − Expense ratio %. This means plan fees are deducted from the gross return each and every year — which is how real-world mutual fund and ETF fees work inside 401(k) plans. Employee contributions are calculated as: Employee contribution = Min(Salary × Contribution %, 2026 IRS employee deferral limit + applicable catch-up) For 2026, the elective deferral limit is $23,500. Under SECURE 2.0, if you are aged 50–59 or 64+, you may contribute an additional $7,500 catch-up. If you are aged 60–63, you qualify for the enhanced "super catch-up" of $11,250. Employer contributions are based on your employer match structure, for example "100% match on the first 4% of pay": Employer contribution (before caps) = Salary × Min(Match %, Match limit %) Then the calculator enforces the 2026 IRS annual additions limit of $70,000 so that: Employee contribution + Employer contribution ≤ $70,000. To estimate after-tax values for Traditional versus Roth 401(k), the model approximates an effective federal income tax rate using simplified 2026 US tax brackets and adds your selected state income tax rate. It applies a modestly lower effective tax rate at retirement, reflecting that many households have lower taxable income in retirement than during peak earning years. Roth-style balances are treated as after-tax and are not reduced again in the projection, assuming IRS rules for qualified withdrawals are met. Retirement income is estimated using the 4% Sustainable Withdrawal Rate (SWR), dividing projected after-tax balance by 25 and showing the monthly equivalent. This widely used rule of thumb — first described by William Bengen in 1994 — suggests a 30-year portfolio historically supported a 4% annual withdrawal with a high probability of not being depleted. It is a planning estimate, not a guarantee.

Worked US 401(k) example (step-by-step)

Consider a 30-year-old worker in the United States earning $75,000 per year, with an existing 401(k) balance of $25,000. They contribute 8% of pay to the plan, their employer matches 50% of contributions up to 4% of salary, they expect a 7% average annual return before inflation, long-run US inflation of 2.5%, and modest salary growth of 2.5% per year. They plan to retire at age 65. 1. In year one, salary is $75,000. The employee contributes 8% of pay, or $6,000. The employer match is 50% of the first 4% of pay (4% of $75,000 is $3,000), so the employer adds $1,500. Total contributions for the first year are $7,500, subject to IRS-style annual caps, which this calculator enforces conservatively. 2. The opening balance of $25,000 plus $7,500 of contributions grows at 7%, leading to an end-of-year balance of approximately $34,225. 3. In year two and beyond, salary increases by 2.5% annually, so contributions rise with pay. Each year, the engine re-applies the same contribution formulas and growth rate, producing a detailed amortization-style schedule of balances, contributions, and growth. 4. By age 65, this worker could see a projected 401(k) balance well into seven figures in nominal dollars. The inflation-adjusted balance in today's dollars is lower, but more meaningful for planning retirement lifestyle and US living costs. The calculator also estimates a Traditional after-tax value by applying an effective tax rate at retirement, and a Roth after-tax value that reflects taxes paid upfront rather than at withdrawal. The summary section highlights the difference between these two approaches so users can see how much tax timing may matter over a multi-decade horizon.

Scenario comparison: higher contributions vs conservative investing

A powerful way to use this US 401(k) calculator is to compare at least two scenarios side by side. For example: Scenario A – Aggressive contributions: You contribute 10% of a $75,000 salary, receive a 4% employer match, expect a 7% annual return, and allow your contribution percentage to increase by 1% per year until you reach the IRS limit. Scenario B – Conservative contributions, conservative portfolio: You contribute 5% of salary, still receive the 4% match, but assume a 5% annual return and no automatic contribution increases. Over a 30–35 year career, Scenario A will usually produce a substantially higher projected 401(k) balance because both the contribution rate and the compounding engine are doing more work. However, Scenario B may feel more comfortable for someone prioritizing short-term cash flow or investing in a lower-volatility mix of US stocks and bonds. By adjusting the "Expected Annual Return", "Annual Salary Growth", and "Annual Contribution Increase" fields and rerunning the calculator, you can explore how different assumptions interact. For many US households, steadily raising contribution rates over time often has more impact on retirement readiness than small tweaks to investment return assumptions.

Common US 401(k) mistakes this calculator can highlight

Several recurring 401(k) mistakes show up clearly when you experiment with the inputs in this calculator: - Not contributing enough to secure the full employer match, which effectively leaves guaranteed compensation unused. - Keeping contribution rates flat for years even as salary climbs, leading to retirement savings that lag behind lifestyle inflation and higher US living costs. - Using unrealistically high return assumptions that underestimate risk and volatility in US and global markets. - Ignoring the impact of inflation, resulting in a retirement balance that looks large in dollars but has far less purchasing power in the future. - Failing to consider tax diversification between Traditional (pre-tax) and Roth (after-tax) 401(k) options, which can make retirement withdrawals less flexible. When you adjust the inputs to remove these mistakes – for example, by increasing contributions to at least the match threshold, turning on modest contribution step-ups, and using a realistic return range – the projected 401(k) path often changes meaningfully.

When to use this US 401(k) calculator

This US-focused 401(k) calculator is most useful for workers who participate in an employer-sponsored 401(k) plan and want a structured way to test contribution strategies. It is particularly valuable when: - You are starting a new job in the United States and need to decide how much of your paycheck to defer into the 401(k). - Your employer changes its match policy and you want to see how the new formula affects long-term retirement savings. - You receive a raise, bonus, or promotion and are deciding how much extra to direct toward retirement versus near-term goals. - You are evaluating Traditional versus Roth 401(k) contributions and want a directional view of after-tax outcomes. - You are within 10–15 years of retirement in the US and want to stress-test whether current savings rates and investment assumptions are on track. For comprehensive retirement planning, pair this calculator with tools that model Social Security benefits, IRA or Roth IRA contributions, and required minimum distributions (RMDs) to capture the full picture of US retirement income.

Key US sources and methodology notes (2026)

The methodology behind this calculator draws on publicly available US government resources and standard financial planning practices. Contribution limits reflect 2026 IRS guidance: employee elective deferral limit $23,500; catch-up for ages 50–59 and 64+ is $7,500; SECURE 2.0 super catch-up for ages 60–63 is $11,250; combined annual additions limit (employee + employer) is $70,000. These figures are sourced from IRS IR-2024-285 and related IRS publications (Publication 560). Tax rate estimates use simplified 2026 US federal income tax brackets for single filers with a user-entered state income tax rate layered on top. Expense ratio modeling deducts the user-specified percentage from the gross annual return each year, reflecting the drag of fund-level and plan-level fees. The retirement income estimate applies the 4% Sustainable Withdrawal Rate rule (Bengen 1994; reaffirmed by subsequent Trinity Study research). Because official IRS limits, US tax brackets, employer plan rules, and the findings on safe withdrawal rates can change, always confirm current thresholds on IRS.gov or with your plan administrator. Treat the projections from this calculator as educational estimates rather than predictions or personalized advice.

Sample US 401(k) outcome at age 65

Illustrative projection for a 30-year-old US worker earning $75,000 with an 8% contribution rate, 4% employer match, 7% expected return, and 2.5% inflation.

Example Inputs
  • Current Age30
  • Retirement Age65
  • Annual Salary (US)$75,000
  • Starting 401(k) Balance$25,000
  • Employee Contribution8% of salary
  • Employer Match4% cap, 50% match
  • Expected Annual Return7% before inflation
  • Inflation Assumption2.5% per year
Example Results
  • Projected 401(k) at 65 (nominal, net of 0.5% expense ratio)$1,050,000+
  • Inflation-adjusted balance in today's US dollars$580,000–$660,000 (approx.)
  • Total employee + employer contributions$400,000+ (approx.)
  • Growth from investment returns (net of fees)$650,000+ (approx.)
  • Est. monthly income at retirement (4% SWR, after tax, Traditional)~$2,800–$3,200/month
Figures are indicative only. Actual repayments may vary by lender.
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What is a 401(k)?

A 401(k) is an employer-sponsored retirement savings plan that allows employees to contribute a portion of their pre-tax salary toward retirement. The employer often matches a percentage of employee contributions, providing free money for retirement savings. Unlike regular savings accounts, 401(k) contributions reduce your current taxable income, and earnings grow tax-deferred until withdrawal in retirement.

The key advantage of a 401(k) is the employer match — it's essentially free retirement money that can significantly accelerate wealth building. Additionally, the tax deferral means more of your money compounds over time without being reduced by annual taxes. However, withdrawals before age 59½ typically incur a 10% penalty plus income taxes, making it a true long-term savings vehicle.

In 2024, employees can contribute up to $23,500 per year, with catch-up contributions of an additional $7,500 for those age 50 and older. Understanding your plan options, contribution limits, and investment allocation is critical for optimizing retirement readiness.

401(k) Growth Formula

Future Value = Principal × (1 + r)^n + Annual Contribution × [((1+r)^n - 1) / r]

Where: Principal is your opening balance, r is the annual return rate (as decimal), n is years, and annual contribution is your yearly deposit. This compounds both your initial investment and regular contributions.

Key Terms & Definitions

Contribution Limit

Maximum amount an employee can deposit annually ($23,500 in 2024)

Employer Match

Employer's contribution to your 401(k), usually a percentage of your salary

Vesting

Timeline on which employer contributions become fully yours (cliff or graded)

Tax Deferral

Postponed taxation on contributions and gains until retirement withdrawal

Rollover

Transfer of 401(k) balance to another retirement account without penalties

Distribution

Withdrawal of funds from your 401(k), typically in retirement

401(k) Optimization Tips

Methodology, Assumptions & Disclaimers (US 401(k) Calculator 2026)

This 401(k) calculator models long-term retirement savings for US workers by combining your salary, contribution rate, employer match, investment return assumptions, plan expense ratio, and time to retirement. It is designed for educational use on tax-advantaged workplace retirement plans and should not be treated as individualized financial or tax advice.

2026 IRS contribution limits: The 2026 employee elective deferral limit is $23,500. Participants aged 50–59 and 64+ may add the standard catch-up of $7,500 (total $31,000). Under the SECURE 2.0 Act (effective 2025), participants aged 60–63 qualify for an enhanced super catch-up of $11,250 (total $34,750). The combined employer + employee annual additions limit is $70,000. The calculator automatically applies the correct catch-up tier based on the age you enter each year.

Expense ratio / plan fee modeling: The expense ratio you enter is subtracted from the gross annual return each year, accurately reflecting how fund and plan administration fees compound against your holdings. Typical US 401(k) index fund expense ratios range from 0.03–0.20%; actively managed funds often charge 0.50–1.50% or more. Even a 0.50% difference in fees can reduce a 30-year portfolio balance by 10–15%.

Contributions are applied annually, employer match is constrained by a match percentage and match cap, and total annual contributions are checked against the 2026 IRS combined limit. The engine approximates effective federal income tax using simplified 2026 brackets and lets you layer in a state tax rate to compare Traditional versus Roth-style after-tax outcomes.

Retirement income estimate (4% SWR): Monthly retirement income figures are derived by applying the 4% Sustainable Withdrawal Rate (William Bengen, 1994; Trinity Study) to the projected after-tax balance and dividing by 12. This is a widely used planning rule of thumb — not a guaranteed safe withdrawal amount — and does not account for sequence-of-returns risk, healthcare cost inflation, or individual spending patterns.

Investment growth assumes a constant average annual net return (gross return minus expense ratio) and smooth compounding over the projection horizon. Real markets are volatile; sequence of returns, job changes, contribution breaks, and investment choices will all affect your actual results. Inflation adjustment is applied using the rate you enter to estimate purchasing power in today's dollars.

Key reference points: IRS IR-2024-285 (2026 retirement plan limits); IRS Publication 560 (retirement plans for small business); SECURE 2.0 Act of 2022 (Pub. L. 117-328) for super catch-up provisions; US Department of Labor 401(k) fee disclosure guidance (29 CFR § 2550); Bengen (1994) and Cooley, Hubbard & Walz (1998) for the 4% SWR rule.

Last updated: March 2026. This tool is for informational and educational purposes only and does not provide financial, tax, or investment advice. Always confirm current IRS rules and consult a qualified professional before making retirement or investment decisions.

Help & FAQs

Frequently Asked Questions

Clear answers to common questions to help you use this calculator confidently.

What is the 401(k) contribution limit for 2026?

Tap to view the answer

For 2026, the IRS employee elective deferral limit is $23,500. Workers aged 50–59 and 64+ can contribute an additional $7,500 standard catch-up, for a total of $31,000. Under the SECURE 2.0 Act (effective 2025), workers aged 60–63 qualify for an enhanced super catch-up of $11,250, allowing up to $34,750 total. The combined employer + employee annual additions limit is $70,000. This calculator automatically applies the correct catch-up tier based on the age you enter.

What is the SECURE 2.0 super catch-up provision for 401(k) plans?

Tap to view the answer

The SECURE 2.0 Act of 2022, effective 2025, introduced an enhanced catch-up specifically for ages 60–63. The super catch-up for this age band is $11,250 annually, significantly higher than the standard $7,500 catch-up for ages 50–59. For example: 62-year-old earning $100K could contribute up to $34,750 total ($23,500 base + $11,250 super catch-up). This phase-in period lasts through 2032, after which the provision sunsets unless extended by Congress. If you're in this critical 60–63 window, take full advantage—the extra $3,750/year compounds to substantial retirement wealth over 2–8 years.

How should I choose my 401(k) contribution rate in the US?

Tap to view the answer

A practical starting point is to contribute at least enough to capture your employer's full match. Example: if your employer matches 4% of salary, contribute at least 4%. On a $75K salary, that's $3,000/year of free money. From there, increase by 1–2% annually until you reach 10–15% total contribution (feasible for many middle-income earners). Use this calculator to test scenarios: $75K salary at 5% match + 10% employee contribution ($7,500) = $30,000 first-year balance growth. At 15% + 4% match = $11,250 contributed share, compounding to $250K-$400K at 30-year horizon assuming 7% returns.

How does this calculator model employer match and IRS limits?

Tap to view the answer

The engine applies your employer match percentage up to the match limit (commonly 0–6% of salary), then enforces the 2026 IRS combined limit of $70,000 total (employee + employer). If your salary, contribution rate, and match would exceed $70K, the calculator proportionally scales back employer contributions. The employee elective deferral limit of $23,500 (plus catch-up) also applies individually. Example: $200K salary, 20% employee contribution ($40K), 5% employer match ($10K). Total = $50K (under $70K limit, both apply fully). But: $500K salary, 20% employee, 5% match = $150K proposed. Calculator caps contributions to $70K total—excess removed from employer match first.

How does a 401(k) expense ratio affect my retirement outcome?

Tap to view the answer

Expense ratios are annual percentage fees charged by funds and plan administration. On a $300K balance with 1.0% fees = $3,000/year drag. With 0.1% fees = $300/year. Difference: $2,700 annually. Over 20 years with 7% target returns, this difference compounds to $100K–$150K in final balance. Example: $100K starting, 7% gross returns, 30-year horizon. At 0.1% fees: $761K final. At 1.0% fees: $639K final. Difference: $122K. Most institutional 401(k) plans offer index funds at 0.05–0.15% fees. Actively managed funds: 0.5–2.0%. Ask your plan administrator for your current expense ratios. If high, request lower-cost alternatives.

What is the difference between Traditional and Roth 401(k)?

Tap to view the answer

TRADITIONAL: Pre-tax contributions reduce taxable income today. $10K contribution = $10K tax deduction if you're in 24% bracket = $2,400 tax savings immediately. Taxes paid upon withdrawal in retirement. ROTH: After-tax contributions. No tax deduction today, but qualified withdrawals (age 59.5+, 5-year hold) are entirely tax-free. On $10K Roth contribution, no tax break now, but $50K at retirement (5x growth) = $50K tax-free withdrawal vs. $37K after 24% tax on Traditional. Choose Traditional if you expect lower tax bracket in retirement or want a big deduction now. Choose Roth if you expect higher tax brackets or want tax-free growth. This calculator shows both scenarios' after-tax value for comparison.

How is the estimated monthly retirement income calculated?

Tap to view the answer

The calculator uses the 4% Sustainable Withdrawal Rate (4% SWR rule). Divide your projected balance by 25, then by 12 months. Example: $500K balance ÷ 25 = $20K annual ÷ 12 = $1,667/month. The 4% rule, derived from the Trinity Study (1998) and refined by William Bengen, suggests a diversified portfolio can historically support 4% annual withdrawals for 30+ years without depletion. Three estimates: Traditional (nominal dollars, inflation not accounted), Traditional (inflation-adjusted dollars), and Roth (tax-free). Example with inflation: $20K nominal annual income may equal $13K in today's purchasing power after 25 years of 2% inflation.

How does inflation affect my US 401(k) projection?

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Inflation erodes the future purchasing power of your retirement savings. This calculator lets you enter a long-run US inflation assumption and optionally adjust results for inflation. When the inflation adjustment is on, the 'inflation-adjusted balance' expresses your projected 401(k) value in today's US dollars, which is far more useful when planning actual living expenses such as housing, healthcare, and everyday costs in retirement.

Can I use this 401(k) calculator if I live in a high-tax US state?

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Yes. You can provide an approximate combined state and local income tax rate (for example, a higher rate for residents of states such as California, New York, or New Jersey) to see how state taxes may affect Traditional 401(k) after-tax outcomes. The calculator adds your state rate to an estimated federal effective tax rate to approximate the combined impact, but it does not model every detail of your personal tax situation.

How often should I revisit my 401(k) plan using this calculator?

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It is sensible for many US households to revisit their 401(k) projection at least once a year and after major life events: job changes, large raises, marriage, buying a home, or moving to a different state. Updating your salary, contribution rate, employer match, expense ratio, and assumptions in this calculator helps you see whether you remain on track for retirement based on current US economic conditions and IRS rules.

What other US calculators should I use alongside this 401(k) tool?

Tap to view the answer

For a more complete US retirement plan, pair this 401(k) calculator with a general retirement calculator, an IRA or Roth IRA calculator, a Social Security benefits estimator, and an RMD calculator. Together, these tools help you understand how workplace savings, individual accounts, government benefits, and withdrawal rules interact over your full retirement lifecycle.

Is this 401(k) calculator providing financial or tax advice?

Tap to view the answer

No. This GlobalCalqulate 401(k) calculator is an educational tool for US users. It relies on user-entered data and simplified assumptions about investment returns, 2026 IRS contribution limits, US federal and state taxes, expense ratios, and the 4% withdrawal rule. It does not account for your full financial picture or provide personalized advice. Always confirm current IRS rules and consult a qualified financial or tax professional before making decisions about contributions, investments, or withdrawals.

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