Preston Seo says don't just pile money into a 401(k), and he makes a lot of sense.

Preston Seo says don't just pile money into a 401(k), and he makes a lot of sense.


December 1, 2025 | Miles Brucker

Preston Seo says don't just pile money into a 401(k), and he makes a lot of sense.


The Purpose Of A 401(k) In Securing Retirement Income

Most financial planners support using a 401(k) because pretax deposits lower taxable income while the balance grows tax-free. This makes the account a strong long-term tool for workers trying to build retirement savings through steady contributions made directly from their paychecks.

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How Pretax Contributions Work Inside A 401(k)

Employees choose a portion of each paycheck to send into a 401(k). That money enters the account before taxes, immediately reducing taxable income. It’s then invested across available options, allowing the balance to grow without capital gains taxes applied during the accumulation years.

How Pretax Contributions Work Inside A 401(k)Vitaly Gariev, Pexels

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The Benefit Of Employer Matching Contributions

Some companies match part of what workers contribute to their 401(k). This feature increases the overall retirement balance without requiring additional salary. For many employees, the match represents an easy opportunity to grow their long-term savings faster than personal contributions alone.

The Benefit Of Employer Matching ContributionsVitaly Gariev, Unsplash

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Why Future Withdrawals Trigger Taxes

Money taken from a 401(k) in retirement is counted as regular income. The tax owed depends on the retiree’s bracket at that time. Although the account helps reduce taxes while working, withdrawals later in life can create a meaningful tax obligation.

Why Future Withdrawals Trigger TaxesRDNE Stock project, Pexels

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The Importance Of Having A 401(k) Exit Plan

Leaving a 401(k) untouched after leaving a job may cause someone to pay more taxes later. A thoughtful exit plan helps manage how and when retirement funds are moved, creating opportunities to reduce long-term tax exposure on savings accumulated over many years.

The Importance Of Having A 401(k) Exit PlanMohamed hamdi, Unsplash

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Who Preston Seo Is In The Finance Space

Preston Seo is an expert investor and financial influencer. His guidance, shared through a recent Instagram post, outlines how wealthy individuals handle 401(k) savings to reduce taxes. His explanation focuses on a clear, step-by-step strategy beginning with contributing normally.

Who Preston Seo Is In The Finance SpaceMiguel Henriques, Unsplash

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What Preston Seo Highlighted In His Instagram Post

Seo used his Instagram post to explain how high-income earners reduce taxes tied to their 401(k) balances. He walked through three steps involving contributions, rollovers, and annual conversions. His goal was to show followers how wealthier investors create more tax-efficient retirement outcomes.

What Preston Seo Highlighted In His Instagram PostSanket Mishra, Pexels

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How A 401(k) Lowers Taxable Income Immediately

He emphasized the upfront benefit of pretax contributions. Sending money into a 401(k) reduces taxable income for the year. This relief is valuable during high-earning periods because every pretax dollar contributed lowers the amount taxed at an individual’s current bracket.

How A 401(k) Lowers Taxable Income ImmediatelyKindel Media, Pexels

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The Example Of A High-Earning Worker

Seo explained that someone earning $150,000 who contributes the maximum $23,500 drops taxable income to $126,500. Although the bracket remains at 24%, the person pays fewer total taxes, reducing the year’s bill from $36,000 to $30,360.

The Example Of A High-Earning WorkerTima Miroshnichenko, Pexels

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How Lower Retirement Income Can Reduce Taxes Later

He also noted that if no additional steps are taken, someone might still pay less tax later if their retirement income places them in a lower bracket. In those situations, the pretax contributions made during working years end up being taxed more gently.

How Lower Retirement Income Can Reduce Taxes LaterRDNE Stock project, Pexels

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Why Wealthy Savers Choose A Rollover Strategy

According to Seo, wealthier investors rarely leave old 401(k) balances untouched. After leaving a job, they typically roll the funds into a traditional IRA. This move keeps the money tax-deferred while opening the door to better investment flexibility and potentially lower overall costs.

File:NYC IRS office by Matthew Bisanz.JPGMBisanz talk, Wikimedia Commons

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Similarities Between 401(k)s And Traditional IRAs

Both account types grow through tax-deferred investment gains. Contributions in each structure aren’t taxed until withdrawn. Although these similarities might cause some savers to overlook rollover opportunities, Seo explained why the additional control in a traditional IRA creates meaningful advantages.

Similarities Between 401(k)s And Traditional IRAsPNW Production, Pexels

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Why 401(k) Investment Menus Are Limited

Employer plans control the available investment lineup inside a 401(k). Participants must choose from that preset list rather than explore the broader market. These limitations keep many savers from building the more diversified or personalized strategies available through other account types.

Why 401(k) Investment Menus Are LimitedVitaly Gariev, Unsplash

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How Traditional IRAs Expand Investment Choice

A traditional IRA allows complete control over how the money grows. Because savers can select from a wide range of investment vehicles, the account supports far more customization than an employer plan. Seo highlighted this expanded freedom as a key reason wealthier investors migrate funds.

How Traditional IRAs Expand Investment ChoiceRDNE Stock project, Pexels

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Understanding 401(k) Expense Ratios

Seo pointed out that 401(k) accounts carry expense ratios that combine management and administrative fees. These charges are deducted automatically and gradually decrease returns. Over many years, those ongoing costs can meaningfully shrink the account’s performance relative to lower-fee alternatives.

Understanding 401(k) Expense Ratiosenergepic.com, Pexels

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Why IRA Fees Can Be Lower If Chosen Carefully

Traditional IRAs also include fees, but savers can choose custodians offering low or zero annual costs. Selecting a cost-efficient provider helps preserve investment gains. Seo considered this flexibility an advantage because individuals can prioritize long-term growth rather than paying unnecessary charges.

Why IRA Fees Can Be Lower If Chosen CarefullyKindel Media, Pexels

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Contribution Limits Do Not Apply To Rollovers

Traditional IRA contribution caps range from $7,000 to $8,000, depending on age. Seo clarified that these limits apply only to new deposits, not to rollovers. That means an entire 401(k) balance can be transferred without violating contribution rules.

Contribution Limits Do Not Apply To Rolloverscottonbro studio, Pexels

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Why Wealthy Savers Use Annual Roth Conversions

After moving funds into a traditional IRA, Seo explained that wealthy investors convert small amounts each year into a Roth IRA. These measured conversions help reposition retirement savings into an account with favorable tax treatment on future investment growth and withdrawals.

Why Wealthy Savers Use Annual Roth ConversionsKarola G, Pexels

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What Makes Roth IRAs Different From Other Accounts

Roth IRA contributions use money that has already been taxed. Although similar investment growth occurs inside the account, withdrawals in retirement are tax-free. Seo described this structure as a major reason many investors prioritize converting traditional IRA funds over time.

What Makes Roth IRAs Different From Other AccountsAndrea Piacquadio, Pexels

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How Investment Gains Grow Inside A Roth IRA

Once money enters a Roth IRA, its investment gains accumulate without future tax obligations. This design protects growth from tax changes that may occur decades later. For Seo, this consistent tax advantage is central to why the conversion strategy appeals to affluent savers.

How Investment Gains Grow Inside A Roth IRAKampus Production, Pexels

Why Roth Conversions Create A Tax Bill Immediately

Seo explained that moving money from a traditional IRA into a Roth IRA counts as taxable income for that year. Because the funds were previously untaxed, the conversion triggers a bill at the individual’s current rate, requiring careful timing and planning.

Why Roth Conversions Create A Tax Bill ImmediatelyNataliya Vaitkevich, Pexels

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How Timing Roth Conversions Can Lower Taxes

Seo recommended spreading conversions across many years. By choosing periods when household income is unusually low, savers can reduce the percentage applied to converted funds. This approach transforms a necessary tax payment into a more manageable long-term strategy.

How Timing Roth Conversions Can Lower TaxesKarola G, Pexels

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Why Low-Income Years Create Conversion Opportunities

A lower income year means a smaller tax burden on the converted amount. Wealthy investors watch their earnings closely and schedule conversions during years when dipping into a smaller bracket becomes possible, improving the long-term efficiency of their retirement plan.

Why Low-Income Years Create Conversion OpportunitiesKarola G, Pexels

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Why Tax-Free Growth Protects Future Retirement Income

Money converted into a Roth IRA can continue compounding without future tax concerns. Seo highlighted this as a major benefit of completing the final step because it shields decades of potential investment gains from future tax changes that might affect retirement security.

Why Tax-Free Growth Protects Future Retirement IncomeKampus Production, Pexels

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The Full Three-Step Process Seo Outlined For Savers

Seo’s method involves contributing to a 401(k), rolling funds into a traditional IRA after leaving a job, and gradually converting portions into a Roth IRA. Each stage targets a different tax advantage, collectively strengthening the long-term value of someone’s retirement savings.

Preston SEO Shares Smarter Ways To Think About Growing MoneyMikhail Nilov, Pexels

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