Form 4972: Tax on Lump-Sum Distributions from Retirement Plans

The form 4972 lump-sum distribution tax allows you to elect ten-year averaging on certain retirement plan distributions, so a large one-time payout gets taxed more like income spread over ten years rather than all at once in your retirement year. The election can cut the bill significantly if the distribution is substantial.

When a lump-sum distribution arrives

A lump-sum distribution occurs when you receive your entire account balance (or a substantial final payment) from a qualified retirement plan in a single taxable year—often when you leave employment or retire. Normally, that would push all the income into one year, potentially bumping you into a much higher marginal tax bracket. Form 4972 lets you spread the taxable portion backward in time, applying the 1986 tax rate schedules as if you had received the distribution equally across ten separate years.

The key requirement: you must have been a plan participant before 1974 or been born before January 1, 1936. These rules have made the election scarcer over time, since anyone born after 1936 who didn’t participate before 1974 cannot use it at all. But for those who qualify, it can deliver meaningful tax savings.

The three-part structure of a lump-sum distribution

The IRS treats different portions of the distribution separately on Form 4972:

1. Net unrealized appreciation (NUA) on employer stock. If your plan distribution includes company stock and the stock has appreciated, you can often exclude the unrealized gain from current income. You’ll pay capital gains tax on the appreciation only when you later sell the stock.

2. Ordinary income portion—wages, interest, dividends, and employer contributions that went into the plan over the years. This is where ten-year averaging applies.

3. Capital gain portion (if any)—gains the plan itself realized. This gets taxed as a long-term capital gain at capital-gains rates, whether or not you elect averaging.

Form 4972 walks you through identifying and segregating each piece, then calculates the tax on the ordinary income using the ten-year formula.

How ten-year averaging actually reduces your tax

The math is straightforward in concept, though the paperwork is dense. You divide the ordinary income portion by ten, figure the tax on one-tenth of that amount using 1986 single-filer rates, then multiply that tax by ten.

Example: You receive a $500,000 lump-sum distribution, of which $400,000 is ordinary income (the rest is NUA or capital gains). One-tenth is $40,000. If 1986 tax tables put the tax on $40,000 at roughly $8,000, then ten times that is $80,000 total tax. Without averaging, the same $400,000 added to your ordinary 2025 income might land you in a much higher bracket—say 32% or 35%—for a total of $128,000 to $140,000. The averaging saves $48,000 to $60,000.

The saving depends on the size of the distribution and your other income that year. Larger distributions create more dramatic bracket creep without averaging, so the benefit scales up.

Who actually qualifies, and why the rules are tight

The IRS narrowed ten-year averaging eligibility sharply over the decades. You can elect it only if:

• You reached age 59½ and separated from employment (or died, or became disabled), and
• The distribution is from a qualified plan (401k, pension, profit-sharing, ESOPs), and
• You were a participant in the plan before January 1, 1974, or you were born before January 1, 1936.

Most people retiring today don’t qualify. If you were born in 1960 and started a job in 2005, you can’t use Form 4972 no matter how large your distribution is. The elections are now confined mostly to late-career workers who have been with traditional pension plans for decades.

Even if you qualify, you elect averaging or you don’t—you can’t elect it for part of the distribution and not the other. And the election is final; you can’t change it after filing, though you can sometimes file an amended return within the statute of limitations if you initially didn’t elect and later wish you had.

Why 1986 tax rates?

The 1986 Tax Reform Act enacted a special rule: if you elect ten-year averaging, you use the tax tables from 1986 (specifically, the 1986 rates applied to unmarried individuals, regardless of your actual filing status). These rates are now historical—1986 top rates topped out at 50%, far higher than modern federal rates—but for lump sums, this is the election’s legal anchor. You can’t use current 2025 rates; the statute locks you into 1986.

This was a one-time benefit written into the law when averaging was enacted. It made the method particularly generous at the time but still provides meaningful savings today because 1986 rates were steep and therefore spreading income (and thus the brackets) was powerful.

Form 4972 filing steps and line-by-line logic

The form is organized in five parts:

Part I identifies the recipient, the plan, and the date of distribution.

Part II breaks down the total distribution into ordinary income, net unrealized appreciation on stock, and capital gains. You’ll need a Form 1099-R from your plan administrator showing the distribution amount and breakdown.

Part III applies the ten-year averaging calculation: you take the ordinary income, divide by ten, look up the tax on one-tenth using the 1986 tables (provided in the form’s instructions), and multiply by ten.

Part IV accounts for any federal income tax already withheld from the distribution.

Part V combines the averaged tax with any capital-gains tax due, subtracts withholding, and yields your payment or refund.

Many filers work through the form with a tax software product that embeds the 1986 tables, or with a CPA who has the tables handy. The form itself contains a simplified worksheet if your situation is straightforward.

When it’s worth the effort

Filing Form 4972 adds complexity and paperwork. It’s usually worth the effort if:

• Your lump-sum distribution is $75,000 or more, so the averaging benefit is substantial.
• You have minimal other income in the distribution year, so the bracket creep without averaging would be steep.
• You’re already working with a tax preparer, since they know the rules and have the required tables.

If the distribution is small ($10,000 to $20,000) or you have high income from other sources, the benefit shrinks. A few taxpayers find that regular taxation actually saves more—this happens if they already occupy a very high bracket before the distribution, or if income-sensitive provisions (like Medicare premium surcharges) kick in at lower thresholds and would be triggered by the extra income. Running both scenarios—with and without averaging—is standard practice.

Interaction with other rules

If you take a lump-sum distribution and some of it is rolled over to an IRA, that rolled-over amount doesn’t count as distributed income and doesn’t appear on Form 4972. Only the amount you receive in cash (or the value of property you receive) that doesn’t go into a rollover is subject to tax. This is why many people do a partial rollover—they take what they need in cash, average it on Form 4972, and roll the rest to avoid immediate taxation.

Also, if you were born in 1936 or later and have no pre-1974 plan participation, no amount of Form 4972 will help you. You’ll owe tax on the distribution at ordinary rates in the year received, though you can always do a direct rollover to an IRA or new employer plan to defer it.

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