How an $840,000 401(k) Can Be Turned Into a Roth IRA and Generate About $4,050 a Month Tax-Free for Life

A pre-tax 401(k) carries a tax obligation that has not yet been paid, and the method used to address it can change the cost by six figures. One timing decision, along with a December 31 cutoff, determines how much of the balance is ultimately kept.

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An $840,000 401(k) built with pre-tax contributions comes with a tax bill that has only been deferred. Money taken from it is taxed as ordinary income. A Roth IRA conversion shifts that tax burden to the present, with the aim of producing about $4,050 a month in tax-free income afterward.

Ways to Shift Money From a 401(k) Into a Roth

A saver generally has three paths: roll the 401(k) into a traditional IRA and convert it gradually over several years, move it directly into a Roth IRA, or use an in-plan Roth conversion while still employed if the plan allows it under 26 U.S.C. § 402A(c)(4). No matter which route is chosen, the converted amount is counted as gross income for that year.

Paying the tax from outside savings is usually better than withholding it from the conversion itself. When tax is withheld, that money never reaches the Roth and cannot grow tax-free. In addition, anyone under 59½ may owe the 10% additional tax on an early distribution.

Roth withdrawals are tax-free after age 59½, once five tax years have passed since the first Roth contribution. Traditional IRAs generally begin required withdrawals at age 73, increasing to 75 for younger generations. Roth IRAs do not have required minimum distributions during the owner's lifetime.

Convert Everything at Once or Over Four Years

For a married couple with no other income, the 2026 standard deduction is $32,200, and the top 37% bracket begins at $768,700. Converting the full $840,000 in one year would create a federal tax bill of roughly $221,051.

Spreading $210,000 of conversions across four years keeps taxable income in the 22% bracket, which ends at $211,400. Each year would cost $28,540, or $114,160 in total, saving about $106,891. The lowest-tax years between the final paycheck and the first required withdrawal are often the best time for conversions of this kind, which is the focus of our free Roth Window guide.

Medicare premiums may also rise. Joint filers with income above $218,000 pay a surcharge. At $750,000 or more, Part B reaches $690 per person per month, plus a $91 Part D add-on. Social Security uses the latest federal tax return the IRS provides, so a conversion can affect premiums later.

Assuming the couple has no other income, each $210,000 conversion stays below the 2026 Medicare surcharge threshold of $218,000. Future thresholds may be different.

Income Produced by the Converted Balance

If the tax is paid from outside funds, the full $840,000 remains in the Roth. Based on the six holdings below, trailing 12-month yields average about 6.0%, which works out to roughly $4,223 a month, above the target from the first year. If the four-year tax bill were withheld from the conversion amount, the income would fall to about $3,649.

Vanguard's Broad Dividend Basket

Vanguard High Dividend Yield ETF (NYSEARCA:VYM) holds a diversified group of dividend-paying stocks, led by a top holding that represents about 7% of assets. The fund makes up 20% of the portfolio, yields about 2.3%, and contributes around 8% of the income. Most of its value is in growth, with shares up about 210% over the past 10 years.

Monthly Option Income From JPMorgan

JPMorgan Equity Premium Income ETF (NYSEARCA:JEPI) generates monthly income by selling options against a lower-volatility stock basket. With a 20% allocation and a yield of about 8.1%, it produces around 27% of the income. Over the past year, its monthly payouts ranged from about $0.34 to $0.45 per share. Within a Roth, the fund's tax structure does not matter.

Casino Rent Exposure Through VICI Properties

VICI Properties (NYSE:VICI) is a REIT that owns real estate and distributes most of its rental income, with holdings that include Caesars Palace and MGM Grand. About 18% of the income comes from its 15% position, which yields about 7.2%. Its quarterly dividend rose from $0.16 in 2018 to $0.46. The operators of those two resorts account for 38% and 32% of its rent.

Main Street Capital's Regular and Supplemental Payouts

A business development company, Main Street Capital (NYSE:MAIN | MAIN Price Prediction), lends to and invests in smaller private businesses. With a 15% weighting and a yield of about 7.6% including supplemental dividends, it contributes about 19% of the income. Its regular monthly payout rises to $0.27 in early 2027, along with a quarterly $0.30 supplemental distribution. Non-accruing loans represent 1% of the portfolio.

Pfizer's Dividend Support

Pfizer, at a 10% allocation, provides about 9% of the income on a yield of around 5.7%. Its dividend represents 56% to 58% of 2026 adjusted EPS guidance of $2.95 to $3.05. Earnings cover the dividend, although cash flow fell short last year. In 2025, free cash flow was about $9.1 billion versus $9.8 billion in dividends.

Preferred Stock and Interest-Rate Sensitivity

Preferred stock, which pays fixed dividends ahead of common shareholders, is represented by iShares Preferred and Income Securities ETF (NASDAQ:PFF). Its 20% position yields about 5.8% and delivers about 19% of the income. Its price tends to move in the opposite direction of interest rates. With the 10-year Treasury yield at 5%, shares are down about 4% over the past year.

How Reliable 'For Life' Income Really Is

Dividends are never guaranteed, and any of these holdings could reduce them. Pfizer's finance chief has described the goal as to "maintain and, over time, grow our dividend," while the portfolio spreads income across six payers, none of which promises its distribution.

The Tax Cost, Monthly Income and Year-End Cutoff

Spreading the conversion lowers the federal tax to about $114,160, versus $221,051 if the full amount is converted at once. Either way, the $840,000 balance can produce about $4,223 a month at current yields. Because conversions are counted in the year they are completed, the key question before December 31 is whether the first $210,000 conversion is pushed into 2026.