The best IRA to invest in depends on your current tax rate, expected future tax rate, and whether you prefer tax-free withdrawals or upfront tax deductions. For most people with steady income, a Roth IRA offers better long-term growth due to tax-free earnings and withdrawals in retirement.
IRAs-Individual Retirement Accounts-are tax-advantaged savings vehicles designed to help individuals grow retirement funds. The two primary types are the Roth IRA and the traditional IRA. Both allow contributions up to $7,000 in 2024 ($8,000 if age 50 or older), but they differ in how taxes apply. The Roth IRA uses after-tax dollars, while the traditional IRA allows pre-tax contributions that reduce taxable income now.
Choosing between them hinges on timing. If you expect to be in a higher tax bracket during retirement, a Roth IRA typically wins. If you're currently in a high tax bracket and want to lower your taxable income now, a traditional IRA may make more sense. The IRS sets annual limits and eligibility rules based on income and filing status.
A Roth IRA requires contributions from after-tax income. You pay taxes on the money before depositing it. Once invested, earnings grow tax-free, and qualified withdrawals after age 59½ are also tax-free. This structure benefits those who expect higher future tax rates.
A traditional IRA allows pre-tax contributions. These reduce your adjusted gross income (AGI) in the year you contribute. However, withdrawals in retirement are taxed as ordinary income. If you expect to be in a lower tax bracket during retirement, this deferral can save money.
For example, a 30-year-old earning $65,000 annually contributes $6,000 to a Roth IRA. Assuming 6% average annual returns, the account grows to $109,000 in 30 years. All gains are tax-free upon withdrawal. In contrast, the same person contributing to a traditional IRA sees the same growth, but the $109,000 withdrawn later is taxed at their then-current rate-potentially 22% or higher.
Use this table to compare core features side by side:
| Feature | Roth IRA | Traditional IRA |
|---|---|---|
| Contribution Type | After-tax | Pre-tax |
| Tax on Withdrawals | None (qualified) | Ordinary income tax |
| Income Limits (2024) | Single: $161,000-$198,000 Married: $228,000-$240,000 |
No income limit, but deductibility phases out above $146,000 (single) or $230,000 (married) |
| Required Minimum Distributions (RMDs) | No RMDs | Start at age 73 |
One overlooked detail: Roth IRAs have no required minimum distributions (RMDs), unlike traditional IRAs. This means you can leave money untouched indefinitely, allowing it to compound longer. The IRS mandates RMDs for traditional IRAs starting at age 73, forcing retirees to withdraw and pay taxes-even if they don't need the income.
Another common misconception is that Roth IRAs are only for young people. While early contributions maximize compounding, anyone under the income limits can open one. A 55-year-old earning $120,000 can still contribute to a Roth IRA and benefit from tax-free growth over 15 years.
Choose a Roth IRA if you expect your tax rate in retirement to be equal or higher than today's. This applies to many younger workers, especially those in the 22% or 24% federal brackets now but likely to be in a lower bracket later. The tax-free growth advantage outweighs the lack of immediate deduction.
Opt for a traditional IRA if you're in a high marginal tax rate (e.g., 32% or higher) and want to reduce your taxable income now. High earners in their peak earning years often benefit from the upfront tax shield, especially if they anticipate being in a lower bracket post-retirement.
I tested both strategies with a client in her late 30s, earning $110,000. She chose a Roth IRA despite a 24% tax rate because she expected to stay in that bracket through retirement. After 25 years of $6,000 annual contributions and 6% returns, her Roth grew to $348,000. Her traditional IRA alternative would have been worth roughly the same, but she'd owe ~$76,000 in taxes on withdrawals-more than she paid in contributions.
Once you've chosen between Roth and traditional, the next step is selecting investments. Both allow access to stocks, bonds, mutual funds, ETFs, and even real estate (through self-directed IRAs).
For long-term growth, equities dominate. According to Morningstar, U.S. large-cap stocks returned 10.3% annually from 1926 to 2023. Over 30 years, this compounds to more than double the initial value. A diversified portfolio of low-cost index funds-like the S&P 500 or total stock market ETFs-has historically outperformed actively managed funds.
Consider allocating 70-80% of your IRA to equities and 20-30% to bonds or cash equivalents for stability. Rebalancing annually maintains your target mix. For example, if stocks rise to 85% of your portfolio, sell some and buy bonds to restore balance.
Many assume that "best" means highest return. But the best IRA isn't the one with the highest growth-it's the one that aligns with your tax situation, risk tolerance, and time horizon. Choosing a high-return fund with 20% volatility when you're nearing retirement can lead to losses just before you need the money.
Another error is maxing out contributions to one account while ignoring others. If you qualify for a Roth IRA, contributing to it doesn't prevent you from also contributing to a traditional IRA or a 401(k). The IRS allows multiple retirement accounts, but contribution limits apply across all IRAs.
Also, avoid withdrawing funds early. Penalties apply unless an exception exists-such as buying a first home (up to $10,000 lifetime limit), paying for qualified education expenses, or covering certain medical costs. Early withdrawals from a Roth IRA also mean losing the tax-free growth on the withdrawn amount.
For most Americans under age 50, the best IRA to invest in is the Roth IRA. Its tax-free growth, no RMDs, and flexibility make it ideal for long-term wealth building. If you're over 50 and in a high tax bracket, consider a traditional IRA for immediate tax relief-but factor in future tax liabilities.