Traditional IRA Mechanics
Traditional IRA Mechanics
A Traditional IRA is a tax-deferred retirement account where contributions reduce your taxable income in the year you make them, and withdrawals in retirement are taxed as ordinary income. The IRS imposes contribution limits, phase-outs for high earners, and mandatory withdrawals starting at age 73.
Key takeaways
- Traditional IRA contributions are tax-deductible up to annual limits ($7,000 in 2024), directly reducing your taxable income.
- You cannot deduct Traditional IRA contributions if you have a high income and access to an employer retirement plan (401(k), pension, 403(b)).
- All withdrawals from a Traditional IRA are taxed as ordinary income in retirement — not only the gains, but the contributions themselves if they were deducted.
- Required Minimum Distributions (RMDs) begin at age 73 and increase as you age; missing an RMD triggers a 25% federal penalty on the shortfall.
- Converting a Traditional IRA to a Roth (called a backdoor Roth) is possible but has income-level restrictions and tax implications.
How Traditional IRA deductions work
When you contribute $7,000 to a Traditional IRA in 2024, the IRS allows you to deduct that $7,000 from your taxable income if you meet certain conditions. If your household income is below the phase-out threshold and you have no workplace retirement plan, the deduction is automatic. If you earn $85,000 and contribute $7,000, your taxable income drops to $78,000. At a 24% marginal tax rate, you save $1,680 in federal income tax that year.
This deduction is the core appeal of Traditional IRAs: immediate tax relief. You get a refund check back from the IRS, or you owe less tax. The trade-off is that all withdrawals in retirement are fully taxable. The money you deducted from income in your earning years is added back to income in your retirement years.
However, the deduction has income limits and requires coordination with employer plans. If your employer offers a 401(k), 403(b), or similar plan, your ability to deduct Traditional IRA contributions phases out. For a single filer with an employer plan, the deduction phase-out range in 2024 is $77,000 to $87,000 of modified adjusted gross income (MAGI). If you earn $82,000, you are in the phase-out; you can deduct a partial contribution. If you earn $88,000 or more, you cannot deduct any Traditional IRA contribution that year.
This creates a painful cliff for high earners with employer plans. A software engineer at a large tech company earning $150,000 cannot deduct any Traditional IRA contribution. The company's 401(k) limit is $23,500, which is not nearly enough to shelter $150,000 of income. The engineer is blocked from tax-deferred investing via Traditional IRA. (This is where the backdoor Roth strategy comes into play, discussed later.)
For married couples filing jointly with an employer plan, the phase-out range in 2024 is $123,000 to $143,000 of MAGI. One spouse can often deduct a contribution even if the other cannot; the rules are complex and depend on whether the non-working spouse had workplace plan access.
Tax treatment of contributions and earnings
All money inside a Traditional IRA grows tax-free while in the account. You can buy stocks, bonds, or funds; they grow; and you pay no tax on dividends, interest, or capital gains. This is the second appeal: tax-deferred compounding. A $10,000 investment at 7% annual growth will become $39,600 in 30 years without tax drag eating into the growth each year.
When you withdraw money in retirement, the entire amount is taxable. The IRS does not distinguish between your contributions and the earnings. If you contributed $100,000 and the account has grown to $400,000, you owe tax on the full $400,000 as you withdraw it. At a 20% effective tax rate in retirement, withdrawing $50,000 nets you $40,000 after tax.
This creates a planning headache called "basis tracking." If you have both deductible and non-deductible IRA contributions (perhaps because you exceeded the deduction phase-out some years), the IRS requires you to average the basis across all your IRAs. You cannot earmark one IRA as "all after-tax" and another as "all pre-tax." This is why high-income individuals with non-deductible IRA contributions often bite the bullet and convert to Roth via a backdoor strategy.
Required Minimum Distributions starting at 73
The IRS is not content to let your money grow tax-free forever. Starting at age 73 (as of 2023; the age increased from 72 under the SECURE 2.0 Act), you must withdraw a minimum amount from your Traditional IRA each calendar year. This amount is calculated using IRS life-expectancy tables divided into your account balance as of December 31 of the prior year.
The formula is simple in concept: IRA balance ÷ life-expectancy factor = RMD for the year. For a 73-year-old with a $1,000,000 IRA, the life-expectancy factor is approximately 27.4, so the RMD is roughly $36,500. At 75, the factor drops to 24.6, raising the RMD to about $40,600. As you age, the RMDs grow, eventually forcing larger withdrawals in very old age.
RMDs are entirely taxable as ordinary income. If you are already receiving Social Security and have rental income, a large RMD can push you into a higher tax bracket and trigger Medicare premium increases (the taxable-income-related adjustment). For retirees living modestly and not needing the money, RMDs can be an unwelcome tax bill forced by IRS rules.
The penalty for missing an RMD is severe: 25% of the shortfall. If you were supposed to withdraw $36,500 and only withdrew $20,000, the $16,500 shortfall is subject to a $4,125 penalty (25% of $16,500). This penalty is higher than the income tax you would have paid on that withdrawal. The IRS reduced the penalty to 10% in 2023 for first-time mistakes, but the default is 25%, and the rule is strictly enforced.
Exception: if you are still working and do not own 5% or more of the company sponsoring your retirement plan, you may be able to delay RMDs from that plan until you retire. This does not apply to IRAs; RMDs from IRAs must begin at 73 regardless of employment status. However, you can make non-deductible contributions to a Traditional IRA after 73 and convert them to Roth, circumventing the RMD on that portion.
The backdoor Roth maneuver for high earners
For high earners locked out of deductible Traditional IRA contributions and direct Roth IRA contributions (due to income limits), the backdoor Roth is the standard move.
The strategy: contribute $7,000 (the 2024 limit) to a Traditional IRA as a non-deductible contribution, then immediately convert it to a Roth IRA. The conversion itself is taxable only on earnings (which are minimal if done right away), and the $7,000 principal goes into Roth tax-free and grows tax-free forever.
The catch: the pro-rata rule. If you have existing Traditional IRAs with pre-tax balances, the conversion is subject to pro-rata taxation. The IRS will tax a portion of the conversion based on your ratio of pre-tax to after-tax IRA balances across all IRAs. This is why high-income individuals often roll old 401(k)s into current employer plans, keeping traditional IRA balances low and enabling clean backdoor Roths.
For a household earning $200,000 with no existing Traditional IRA balance, the backdoor Roth is straightforward and highly recommended: $14,000 per year ($7,000 each spouse) flows into Roth tax-free. Over a 30-year career, that $14,000 annual deposit compounds at 7% to approximately $1.3 million in tax-free retirement savings.
Decision tree
Next
Traditional IRAs offer immediate tax relief but require mandatory withdrawals in retirement and potentially trap you in a higher tax bracket later. Roth IRAs flip the equation: contributions are not deductible now, but withdrawals are tax-free forever and carry no RMDs during your lifetime.