Taxable Account vs. IRA Calculator

Enter your investment amount, contributions, growth rate, and tax rates to see whether a taxable account or IRA (Traditional or Roth) delivers more after-tax wealth over your investment horizon.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter the Initial Investment Amount
Input the starting amount you plan to invest in both the taxable account and the IRA.
2
Enter the Annual Contribution
Input the amount you will add to each account every year.
3
Enter the Annual Growth Rate
Input the expected annual rate of return on your investments as a percentage.
4
Enter the Investment Period
Input the number of years you plan to hold the investments.
5
Enter the Capital Gains Tax Rate
Input the long-term capital gains tax rate that applies to your taxable account.
6
Enter the IRA Tax Rate
Input the income tax rate you expect to pay when withdrawing from a traditional IRA in retirement.
7
Compare Net Amounts
Review the after-tax value of each account to see which strategy yields more.

Example Calculation

An investor compares putting $10,000 with $5,000 annual contributions into a taxable brokerage account versus a traditional IRA over 25 years.

Initial Investment

$10,000

Annual Contribution

$5,000

Annual Growth Rate

Investment Period

25 years

Capital Gains Tax Rate

15%

IRA Tax Rate

22%

Results

Taxable account net amount

approximately $282,538 after paying 15% capital gains tax on gains. IRA net amount: approximately $262,498 after paying 22% income tax on the full withdrawal. In this scenario, the taxable account wins because the lower capital gains rate and cost-basis exclusion outweigh the IRA's tax-deferred growth.

Tips

Consider Your Expected Retirement Tax Bracket

If your retirement tax rate will be significantly lower than your current rate, the IRA's tax deferral becomes more valuable. If rates stay similar, the taxable account's capital gains advantage often wins.

Account for Tax-Loss Harvesting

Taxable accounts allow you to sell losing positions to offset gains, an advantage IRAs do not offer. This can effectively lower your taxable account's tax drag over time.

Factor in IRA Contribution Limits

IRA contributions are capped at $7,000 per year ($8,000 if 50+) for 2025. If you want to invest more, the excess must go into a taxable account regardless.

Remember Required Minimum Distributions

Traditional IRAs require withdrawals starting at age 73, potentially forcing you into a higher tax bracket. Taxable accounts have no such requirement, giving you more control over withdrawal timing.

Comparing After-Tax Returns: Taxable vs. IRA Accounts

The Taxable Account vs. IRA Calculator provides a detailed comparison of investment growth and net after-tax returns between a standard taxable brokerage account and either a Traditional or Roth IRA. For long-term investors planning for retirement or other significant financial goals, understanding the impact of tax efficiency is paramount. In 2025, with IRA contribution limits at $7,000 (or $8,000 for those 50 and over), leveraging these tax-advantaged accounts can significantly outperform taxable alternatives over decades, especially when factoring in the power of compounding.

How Tax Efficiency Drives Long-Term Investment Growth

Tax efficiency is a cornerstone of successful long-term investing, profoundly impacting your eventual wealth accumulation. In a taxable brokerage account, capital gains, dividends, and interest are often subject to taxes annually or upon sale, creating "tax drag" that eats into your returns. Conversely, IRAs offer tax-advantaged growth, allowing your investments to compound more effectively. Traditional IRAs defer taxes until retirement, while Roth IRAs provide tax-free withdrawals in retirement. This difference, particularly over an investment horizon of 10, 20, or even 30 years, can result in tens or even hundreds of thousands of dollars more in your pocket, making the choice of account type a critical financial decision.

Exploring IRA Account Types and Their Tax Impact

This calculator evaluates the performance of three primary investment vehicles: a standard taxable brokerage account, a Traditional IRA, and a Roth IRA. The core logic involves projecting the future value of investments in each, then applying the relevant tax rules.

For a Taxable Account:

Annual Taxable Gain = (Previous Year End Value + Annual Contribution) × Annual Growth Rate
Capital Gains Tax = Annual Taxable Gain × Capital Gains Tax Rate
Taxable Account Value (Year N) = Previous Year End Value + Annual Contribution + Annual Taxable Gain - Capital Gains Tax

For a Traditional IRA:

Traditional IRA Value (Year N) = (Previous Year End Value + Annual Contribution) × (1 + Annual Growth Rate)
Withdrawal Tax = Traditional IRA Value (at withdrawal) × IRA Withdrawal Tax Rate
Net Traditional IRA = Traditional IRA Value (at withdrawal) - Withdrawal Tax

For a Roth IRA:

Roth IRA Value (Year N) = (Previous Year End Value + Annual Contribution) × (1 + Annual Growth Rate)

Roth withdrawals are tax-free, assuming qualified distributions. The calculator then compares the net after-tax values to recommend the most advantageous option.

💡 Understanding the tax implications of different accounts is essential for retirement planning. Our Pension Plan Calculator can help you evaluate another key component of your retirement income strategy.

Comparing a Traditional IRA to a Taxable Account

Let's consider an investor starting with an initial $10,000, contributing $2,000 annually at a 5% average annual growth rate over 20 years. They anticipate a 15% long-term capital gains tax rate for the taxable account and a 20% ordinary income tax rate for Traditional IRA withdrawals in retirement.

Project Taxable Account Growth: Each year, the taxable account grows, and capital gains tax is applied to realized gains (or assumed for simplicity). Over 20 years, the compounded effect of paying capital gains tax will reduce the overall net return.
Project Traditional IRA Growth: The Traditional IRA grows tax-deferred for 20 years. All contributions and earnings compound without annual tax drag.
Calculate After-Tax Values:
- Taxable Account (Net After Tax): After 20 years, the gross value is calculated, and capital gains tax is applied to the total appreciation. For the given example, the estimated net after-tax value would be approximately $68,767.47.
- Traditional IRA (Net After Tax): The total accumulated value after 20 years, approximately $100,271.84, is then subjected to the 20% withdrawal tax. Withdrawal Tax = $100,271.84 × 0.20 = $20,054.37 Net Traditional IRA = $100,271.84 - $20,054.37 = $80,217.47

In this scenario, the Traditional IRA provides a net advantage of approximately $11,450 over the taxable account ($80,217.47 - $68,767.47).

💡 To further refine your retirement income strategy, our Pension Payout Options Calculator can help you analyze different ways to receive your pension benefits.

Formula Variants for Retirement Account Comparisons

When comparing taxable accounts to IRAs, several formula variants or assumptions can be used, particularly regarding how capital gains tax is applied in the taxable account. The most common approach, used here, assumes capital gains tax is paid annually on realized gains or accrued gains (often a simplification for modeling purposes). However, a more precise approach for long-term taxable accounts might assume taxes are only paid when investments are sold, leading to greater tax deferral within the taxable account itself. Another variant considers the "tax on dividends" separately, which are typically taxed at ordinary income rates or qualified dividend rates annually. For Roth IRAs, the primary variant is often the "backdoor Roth IRA" strategy, where contributions are made to a non-deductible Traditional IRA and then converted to a Roth, allowing high-income earners to bypass direct Roth contribution limits, which can be over $161,000 for single filers in 2025. This calculator uses a simplified annual capital gains tax application for the taxable account and direct contributions for IRAs.

Frequently Asked Questions

When is a taxable brokerage account better than an IRA?

A taxable account may be better when your retirement tax rate will be similar to or higher than your current capital gains rate, when you need access before 59 1/2, when you have already maxed out IRA and 401(k) contributions, or when you want to use tax-loss harvesting.

How are taxable investment accounts and traditional IRAs taxed differently?

In a taxable account, you pay capital gains tax only on profit when you sell, and qualified dividends get the lower capital gains rate. In a traditional IRA, you get a tax deduction on contributions but pay ordinary income tax on the entire withdrawal amount.

Does tax-deferred growth in an IRA always beat a taxable account?

Not always. If your taxable account gains qualify for the 15% long-term capital gains rate and you use tax-loss harvesting, the after-tax result can be similar or better, especially if your retirement income tax rate is high.

What are the liquidity differences between a taxable account and an IRA?

Taxable accounts offer full liquidity with no age restrictions or penalties. Traditional IRAs impose a 10% early withdrawal penalty before age 59 1/2. Roth IRAs allow tax-free withdrawal of contributions at any time but earnings may be penalized.