For workers within three years of retirement, the single most consequential 401(k) rule is not about contribution limits or investment allocation. It is the Required Minimum Distribution mandate, which forces account holders to begin withdrawing money from tax-deferred accounts starting at age 73 or face steep penalties. Getting the timing wrong on even the first withdrawal can trigger a double tax hit in a single calendar year, a costly mistake that is entirely preventable with basic planning.
Why Age 73 Is the Line That Matters
The required beginning date for 401(k) and IRA distributions is now pegged to age 73 under current law. That means anyone who turns 73 must take their first RMD by April 1 of the following year, a framework the IRS describes in qualified plan guidance that covers distributions and rollovers from 401(k)s and similar arrangements. The same rules explain that if a worker is not a 5% owner and is still employed, a “still working” exception may allow them to delay distributions from that employer’s plan, but once they retire or cross the ownership threshold, the RMD clock starts.
The math behind each withdrawal is straightforward but unforgiving. The IRS divides the prior year-end account balance by a life expectancy factor drawn from the Uniform Lifetime Table in Publication 590-B, and at age 73 the applicable denominator is 26.5, dropping to 25.5 at age 74 so the required withdrawal percentage rises every year. For a $500,000 balance at 73, the first RMD would be roughly $18,868, and failing to take that minimum on time can trigger a substantial excise tax on the shortfall, effectively shrinking the nest egg just when a retiree is starting to rely on it.
The Double-Tax Trap of Delaying Your First RMD
One of the most damaging mistakes a new retiree can make is exercising the option to push the first RMD to April 1 of the year after turning 73 without understanding the tax consequences. IRS officials have cautioned that delaying the initial withdrawal can force two taxable RMDs into the same calendar year, because the first must be taken by April 1 and the second by December 31, and both distributions are taxed as ordinary income. For retirees who already have pension payments, part-time wages, or investment income, stacking those withdrawals in one year can push them into a higher marginal bracket, increase Medicare premium surcharges, and cause a larger share of Social Security benefits to become taxable.
Consider a retiree who turned 73 in 2024 and decides to wait until early 2025 for the first RMD. That person must still take the 2025 RMD by the end of that same year, creating a one-time spike in reported income that can easily add tens of thousands of dollars to adjusted gross income if the 401(k) balance is substantial. For many households, the more tax-efficient approach is to take the first distribution in the year they actually turn 73, accepting a smaller increase in income in that initial year in exchange for avoiding a compressed, two-RMD hit later, though the optimal choice always depends on other income sources and deductions.
Beneficiary Rules That Change If You Die After RMDs Begin
The timing of RMDs does not just affect the account holder; it also shapes what heirs must do with inherited accounts. Under proposed regulations outlined in an Internal Revenue Bulletin from 2024, if an IRA or 401(k) owner dies on or after their required beginning date, most non-spouse beneficiaries are subject to both an annual RMD obligation and a requirement to fully deplete the account by the end of the tenth year. This hybrid approach means heirs cannot simply ignore the account for nine years and then empty it in year ten, because they must take at least some taxable income in each interim year.
The IRS elaborated on this framework in a later regulatory update that clarified how the 10-year rule interacts with life-expectancy-based payout schedules when the original owner had already reached their required beginning date. In that situation, beneficiaries typically must calculate annual distributions using their own life expectancy while still ensuring that the account is exhausted by year ten, limiting their flexibility to time withdrawals around career changes or other income events. For pre-retirees approaching age 73, this makes beneficiary designations and an understanding of how death before or after the required beginning date affects heirs an important part of estate and tax planning.
Roth Catch-Up Rules Add a New Variable
The SECURE 2.0 Act introduced another wrinkle for workers nearing retirement: certain higher earners must now make catch-up contributions on a Roth basis inside employer plans. The Treasury Department and IRS described this in final regulations that require employees whose prior-year wages exceed a specified threshold to direct their catch-up amounts into designated Roth accounts. These contributions are made with after-tax dollars, but future qualified withdrawals are tax-free, and the regulations give plan sponsors transition relief as they update payroll and recordkeeping systems.
For someone within three years of retirement, this shift changes the planning calculus in a meaningful way because Roth 401(k) balances are not subject to RMDs during the original account holder’s lifetime under current law. Every dollar funneled into the Roth side of a plan is a dollar that will not inflate future required withdrawals from the traditional side, which can help moderate taxable income in the 70s and beyond. Near-retirees who are eligible for catch-up contributions should confirm whether their employer has implemented the Roth requirement, evaluate whether the higher current-year tax bill is acceptable, and consider coordinating Roth catch-ups with partial Roth conversions to build a more flexible mix of taxable and tax-free income sources.
Using IRS Tools and Professional Help to Avoid Costly Errors
Because RMD calculations and beneficiary rules are highly technical, many retirees benefit from using official IRS resources before acting. Individuals who receive an unexpected notice about missed withdrawals or tax underpayments can check the status and details of their account through the online tax notice system, which helps clarify whether an apparent issue stems from a reporting mismatch, a late distribution, or another error. Those who are trying to understand how penalties might apply or be waived can also review account transcripts and correspondence through the same portal, making it easier to prepare a response or request abatement.
Taxpayers who need in-person support can use the IRS appointment scheduler at local offices to meet with representatives who can explain how RMD rules apply to their specific situation, especially if multiple plans, rollovers, or inherited accounts are involved. For more complex cases, such as coordinating distributions across several employer plans, evaluating Roth strategies, or navigating the 10-year rule for multiple beneficiaries, working with a credentialed preparer or advisor who understands the latest regulations can be crucial, and professionals can access additional tools through the dedicated tax pro gateway that supports secure communication with the agency.
Ultimately, pre-retirees within three years of age 73 face a narrow window to align their 401(k) strategy with the realities of RMDs, beneficiary obligations, and new Roth catch-up requirements. By learning how the required beginning date works, avoiding the trap of stacking two first-year withdrawals into a single tax year, updating beneficiary designations with the 10-year rule in mind, and taking advantage of both IRS resources and professional guidance, workers can turn a rigid set of distribution rules into a manageable, and even strategic, part of their retirement income plan.
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*This article was researched with the help of AI, with human editors creating the final content.
Nathaniel Cross focuses on retirement planning, employer benefits, and long-term income security. His writing covers pensions, social programs, investment vehicles, and strategies designed to protect financial independence later in life. At The Daily Overview, Nathaniel provides practical insight to help readers plan with confidence and foresight.
