Why Maxing Catch-Up Contributions in Your Final Working Years Can Cost High Earners a Fortune
For many accomplished professionals, the decade before retirement carries a particular financial urgency. After years of prioritizing business growth, raising children, or managing competing financial obligations, the 50s often arrive with a sobering realization: retirement accounts may not reflect decades of hard work. The instinct, understandably, is to overcorrect — to flood 401(k) accounts with every available dollar during the final working years and recover lost ground before the clock runs out.
It is a strategy that feels prudent. The IRS even accommodates it, allowing individuals aged 50 and older to contribute an additional $7,500 annually in catch-up contributions to employer-sponsored retirement plans in 2024, on top of the standard $23,000 limit. For those 60 through 63, SECURE 2.0 legislation expanded that figure further, to $11,250. The message from Washington appears unambiguous: save more, save aggressively, and do so while you still can.
But for high earners — those with household incomes consistently above $200,000 — the conventional catch-up strategy frequently produces outcomes that are more complicated, and considerably more expensive, than anticipated. The numbers on paper can obscure a set of downstream consequences that only become visible years later, often at the worst possible moment.
The Tax-Deferred Illusion
The foundational appeal of traditional 401(k) contributions is the deferral of income taxes. Every dollar contributed reduces taxable income today, with the understanding that taxes will be paid upon withdrawal in retirement — presumably at a lower rate. For high earners still in peak earning years, this logic appears sound on its surface.
The problem is what happens on the other side of the equation. A professional who aggressively contributes to a traditional 401(k) throughout their late career may arrive at age 73 — when required minimum distributions begin — with a balance that generates mandatory annual withdrawals large enough to push them into the same or higher tax bracket they were in during their working years. The deferral, in such cases, becomes a deferral of a problem rather than a solution to one.
Consider a high earner who enters retirement with $3 million in traditional 401(k) assets alongside a pension, rental income, and Social Security benefits. The IRS does not permit that individual to withdraw funds on their own schedule. RMDs are calculated using life expectancy tables, and the resulting distributions may be substantial enough to trigger the 37% federal bracket — a rate that may well exceed what the individual would have paid had they chosen a different savings vehicle during their working years.
Social Security as an Unintended Casualty
The interaction between large traditional retirement account balances and Social Security taxation is one of the most underappreciated risks in late-career financial planning. Up to 85% of Social Security benefits become taxable when combined income — defined as adjusted gross income plus nontaxable interest plus half of Social Security benefits — exceeds $44,000 for married couples filing jointly.
For high earners whose RMDs push their combined income well past this threshold, the effective tax rate on Social Security benefits can be substantial. An individual who might have structured their retirement income more thoughtfully — through a combination of Roth assets, taxable brokerage accounts, and strategic Social Security timing — could have largely avoided this outcome. Aggressive late-career contributions to traditional 401(k) accounts, paradoxically, can increase the lifetime tax burden on income that was never even generated by those accounts.
The Medicare Premium Complication
Another consequence that rarely surfaces in conversations about catch-up contributions is the effect on Medicare premiums. The Income-Related Monthly Adjustment Amount, commonly known as IRMAA, adds surcharges to Medicare Part B and Part D premiums based on modified adjusted gross income from two years prior. For 2024, individuals with MAGI above $103,000 — and couples above $206,000 — begin paying elevated premiums.
Large RMDs can push retirees well past these thresholds, resulting in Medicare surcharges that compound year after year. A married couple with combined RMDs of $200,000 annually, alongside other income sources, may find themselves paying thousands of dollars more per year in Medicare premiums than a peer who structured their retirement assets differently — regardless of comparable net worth.
What Smarter Late-Career Planning Actually Looks Like
None of this suggests that high earners in their 50s and 60s should abandon retirement savings altogether. The issue is not the act of saving aggressively — it is the vehicle and the strategy chosen to do so.
Prioritizing Roth contributions where available. For high earners whose income exceeds direct Roth IRA contribution limits, employer-sponsored Roth 401(k) options may offer a meaningful alternative. Contributions are made with after-tax dollars, growth is tax-free, and Roth 401(k) assets — when rolled to a Roth IRA — are not subject to RMDs under current law. The tax is paid now, at a known rate, rather than deferred into an uncertain future.
Executing strategic Roth conversions. Rather than maximizing traditional contributions, some high earners may benefit from intentionally converting existing pre-tax balances to Roth accounts during years when income is temporarily lower — a business transition, a sabbatical, or the gap between retirement and Social Security commencement. This proactive approach reduces future RMD exposure and the cascading effects described above.
Building taxable brokerage assets. Contributions to taxable investment accounts do not carry the same tax advantages as retirement accounts, but they also carry none of the RMD obligations. Long-term capital gains rates — currently 0%, 15%, or 20% depending on income — may compare favorably to ordinary income rates applied to large RMDs. Additionally, taxable accounts offer flexibility in timing income recognition that retirement accounts simply cannot match.
Considering deferred compensation plans with care. Some high earners have access to nonqualified deferred compensation arrangements through their employers. When structured thoughtfully, these plans can defer income into retirement years at lower marginal rates. However, they carry counterparty risk and require careful evaluation of distribution timing provisions.
The Role of Holistic Planning
The central failure of the aggressive catch-up contribution strategy is not that it lacks logic — it is that it addresses one variable in isolation while ignoring the broader financial system in which that variable operates. Retirement income is not simply a function of account balances; it is a function of how those balances interact with tax law, government benefit programs, healthcare costs, and estate planning objectives.
High earners approaching their final working years deserve a comprehensive analysis that models multiple scenarios across a range of variables: tax bracket trajectories, Social Security claiming strategies, RMD projections, Medicare premium exposure, and legacy goals. The strategy that produces the largest account balance at retirement is not necessarily the one that produces the most wealth over a lifetime — or the most efficient transfer of that wealth to the next generation.
At Capitals Pro, we consistently observe that the professionals who arrive at retirement in the strongest financial position are not those who saved the most in any single year. They are those who thought carefully about where each dollar was saved, when it would be taxed, and how every decision would interact with the ones that followed. Late-career financial planning is not a sprint to maximize contributions. It is a precision exercise in optimizing outcomes across decades — and that requires a strategy far more sophisticated than simply filling every available tax-deferred bucket to its legal limit.
