How to Use This Calculator
- 1
Enter your Current IRA Balance
Input the current value of your Individual Retirement Account (IRA) as of today.
- 2
Provide your Current 401(k) Balance
Enter the current value of your employer-sponsored 401(k) account.
- 3
Specify your Annual IRA Contribution
Indicate how much you plan to contribute to your IRA each year. The 2026 limit is $7,000 ($8,000 if 50 or older).
- 4
Input your Annual 401(k) Contribution
Enter the amount you intend to contribute to your 401(k) annually. The 2026 limit is $23,500.
- 5
Define Employer Match Percentage
If your employer matches 401(k) contributions, enter the percentage they contribute (e.g., 50 for 50 cents per dollar).
- 6
Set Employer Match Cap
Enter the maximum dollar amount your employer will match per year, if applicable.
- 7
Enter the Annual Growth Rate
Estimate the average annual return you expect on your investments in both accounts.
- 8
Specify the Investment Horizon
Indicate the number of years you plan to contribute to and grow these accounts before retirement.
- 9
Review your results
Compare the Best Account winner, IRA Final Balance, 401(k) Final Balance, Total Employer Match, and IRA Investment Gains. The insights panel shows employer match impact and combined savings. The chart and table track growth year by year.
Example Calculation
A mid-career professional is comparing the long-term growth of their IRA and 401(k) accounts, including an employer match.
Current IRA Balance ($)
$40,000
Current 401(k) Balance ($)
$60,000
Annual IRA Contribution ($)
$6,000
Annual 401(k) Contribution ($)
$10,000
Employer Match Percentage (%)
50
Employer Match Cap ($)
$5,000
Annual Growth Rate (%)
7
Investment Horizon (years)
20
Results
Best Account
401(k)
IRA Final Balance
$417,978
401(k) Final Balance
$890,159
Total Employer Match
$100,000
IRA Investment Gains
$257,978
Tips
Prioritize Employer Match
Always contribute enough to your 401(k) to get the full employer match — it's free money. A 50% match on $10,000 adds $5,000/year, growing to $100,000 in direct contributions over 20 years.
Maximize Contribution Limits
Aim to contribute the maximum allowed to both your 401(k) ($23,500 in 2026) and IRA ($7,000 in 2026, or $8,000 if 50+) to accelerate your retirement savings and take full advantage of tax benefits.
Diversify Across Account Types
Consider balancing contributions between pre-tax (Traditional 401(k)/IRA) and after-tax (Roth 401(k)/IRA) accounts. This strategy provides tax flexibility in retirement, allowing you to draw from different accounts to manage your taxable income.
Comparing IRA vs. 401(k) Growth for Retirement Planning
The IRA vs. 401(k) Calculator offers a comparative projection of your retirement savings, factoring in individual contributions, employer matching, and expected investment growth over time. This tool helps you visualize the long-term impact of your choices, enabling you to determine the most effective strategy for your financial future.
For example, with a $40,000 IRA balance, a $60,000 401(k) balance, $6,000 and $10,000 annual contributions respectively, a 50% employer match capped at $5,000, and 7% growth over 20 years, the 401(k) grows to $890,159 while the IRA reaches $417,978.
Why Comparing Retirement Accounts is Essential
Choosing between an IRA and a 401(k) (or contributing to both) is a pivotal decision in retirement planning. Each account type offers distinct advantages regarding contribution limits, tax treatment, investment options, and the availability of employer matching funds.
Understanding these differences allows you to optimize your savings strategy, take full advantage of tax deferral or tax-free growth, and potentially accelerate your journey towards financial independence in retirement.
The Future Value Calculation for IRAs and 401(k)s
This calculator projects the future value of both your IRA and 401(k) using a compound interest formula that accounts for initial balances, annual contributions (including employer match for 401(k)s), and a specified annual growth rate over an investment horizon.
Contributions are assumed to be made at the beginning of each year.
Future Value = Current Balance × (1 + r)^Years
+ Annual Contribution × (((1 + r)^Years - 1) / r) × (1 + r)
Annual Match = min(401(k) Contribution × Match %, Match Cap)
For the 401(k), Annual Contribution includes your personal contribution plus the employer match.
The (1 + r) multiplier at the end models beginning-of-year contributions.
Projecting IRA and 401(k) Balances: A Case Study
Consider an individual with a $40,000 IRA and a $60,000 401(k).
They contribute $6,000 annually to the IRA and $10,000 to the 401(k).
Their employer offers a 50% match on 401(k) contributions, capped at $5,000 per year.
With an expected 7% annual growth rate over 20 years:
- Calculate 401(k) Annual Contribution (with match): Employee contribution of $10,000 + employer match of min($10,000 × 50%, $5,000) = $10,000 + $5,000 = $15,000 total per year.
- Project IRA Final Balance: Initial $40,000 lump sum grows to $154,787. Annual $6,000 contributions (beginning-of-year) grow to $263,191. Total IRA: $417,978.
- Project 401(k) Final Balance: Initial $60,000 lump sum grows to $232,181. Annual $15,000 contributions (including match) grow to $657,978. Total 401(k): $890,159.
The 401(k) with its employer match outperforms the IRA by $472,180, with $100,000 coming directly from employer match contributions and the rest from compound growth on those contributions.
Key Differences in Retirement Account Structures
IRAs and 401(k)s represent the two primary avenues for individual retirement savings, each with distinct characteristics. The most notable difference lies in contribution limits: for 2026, individuals can contribute up to $7,000 to an IRA ($8,000 if age 50 or older), while 401(k)s allow significantly higher employee contributions, up to $23,500 ($31,000 if age 50 or older).
A critical advantage of a 401(k) is the potential for employer matching contributions, which can effectively double a portion of your savings immediately. IRAs, on the other hand, typically offer a broader range of investment choices, from individual stocks and bonds to real estate, providing greater flexibility for self-directed investors. Both offer tax advantages, either through pre-tax contributions and tax-deferred growth (Traditional) or after-tax contributions and tax-free withdrawals in retirement (Roth).
Understanding the Future Value of Annuity Calculation
When comparing retirement accounts, a crucial component of the projection is the future value of an annuity, which represents the accumulated value of a series of equal payments (your annual contributions) over time, compounded at a specific interest rate.
The future value (FV) of a lump sum is:
FV = P × (1 + r)^n
where P is the principal, r is the annual growth rate, and n is the number of years.
The future value of an annuity due (beginning-of-period payments) is:
FV_annuity = Pmt × (((1 + r)^n - 1) / r) × (1 + r)
where Pmt is the annual payment (contribution).
This calculator uses a combination of these formulas to accurately project the growth of both your initial balances and your ongoing annual contributions, providing a comprehensive long-term outlook for your retirement savings.
Frequently Asked Questions
What are the IRA and 401(k) contribution limits for 2025?
For 2025, the IRA contribution limit is $7,000 ($8,000 if 50+). The 401(k) employee deferral limit is $23,500 ($31,000 if 50+). The total 401(k) limit including employer contributions is $70,000.
Is an IRA or 401(k) better for retirement savings?
It depends on your situation. A 401(k) is generally better if your employer offers a match. An IRA typically offers wider investment selection and potentially lower fees. The ideal strategy is to contribute enough to the 401(k) for the full match, then fund an IRA, then direct additional savings back to the 401(k).
How does an employer 401(k) match work?
An employer match means your company contributes additional money based on your own contributions. A common formula is 50% of employee contributions up to 6% of salary. The match is subject to a vesting schedule, meaning you may need to work a certain number of years before you fully own the employer contributions.
Can I contribute to both an IRA and a 401(k) in the same year?
Yes. You can contribute to both up to their respective limits. However, if you are covered by an employer plan, your ability to deduct traditional IRA contributions may be limited based on income. Roth IRA contributions have separate income limits.