Updated September 28, 2026. Quick answer: code A flags that a lump-sum distribution may qualify for the 10-year tax averaging method on Form 4972, and it is a narrow flag: eligibility runs through the plan participant’s birth date, not the recipient’s.
Read box by box from the IRS form text: Form 1099-R box 6, Form 1099-R box 8 and Form 1099-R boxes 9a and 9b.
What the IRS tells the payer
From the current instructions, code A is “May be eligible for 10-year tax option”. The full instruction text reads: “Use code A only for participants born before January 2, 1936, or their beneficiaries to indicate the distribution may be eligible for the 10-year tax option method of computing the tax on lump-sum distributions (on Form 4972, Tax on Lump-Sum Distributions). To determine whether the distribution may be eligible for the tax option, you need not consider whether the recipient used this method (or capital gain treatment) in the past.” It may be used with: 4 or 7.
Who this actually covers
The eligibility test looks at the participant who earned the benefit, born before January 2, 1936, and it extends to that person’s beneficiaries even if the beneficiary themselves is much younger. The instructions are explicit that you do not need to check whether the recipient used this method, or capital gain treatment, in a prior year.
Which line it drives
Form 1099-R’s recipient instructions route this directly: “if this is a lump-sum distribution, see Form 4972.” Form 4972 computes a separate tax on the distribution instead of adding it to ordinary income, and, on the 2025 Form 4972, the tax on the lump-sum distribution is included in the total on Form 1040, 1040-SR, or 1040-NR, line 16 (with box 2 checked), rather than on the wages or pensions line.
The 10% additional tax
Because eligibility requires the participant to have been born before January 2, 1936, whoever the participant was is necessarily well past 59½ by 2026. The early-distribution question does not arise for a genuine code A distribution.
Common mistakes
- Assuming code A applies to anyone taking a lump sum. It is limited to distributions tied to a participant born before January 2, 1936.
- Missing that a beneficiary can qualify through the decedent participant’s birth date even if the beneficiary is younger.
Box 7 is the payer’s claim, not the law
The code in Box 7a records what the custodian knew when it cut the cheque. It is not a ruling on what you owe, and the IRS instructions say so in as many words. On code 1 the instruction to payers is to use it “even if the distribution is made for medical expenses, health insurance premiums, qualified higher education expenses, a first-time home purchase…” and a list of other genuine statutory exceptions.
Related codes worth reading alongside this one: code C, and code 4, the death code that pairs with A most often.
Every code in one place: the Box 7 table. If yours looks wrong: how to fix it.
Figures verified against the IRS Instructions for Forms 1099-R and 5498 (2026), the 2026 Form 1099-R recipient instructions and the 2025 Form 4972; the 2026 Form 4972 was not yet available to read on September 30, 2026.
Sources
- IRS, Instructions for Forms 1099-R and 5498 (2026), Table 1, Guide to Distribution Codes: https://www.irs.gov/instructions/i1099r
- IRS, Instructions for Form 5329 (2025): https://www.irs.gov/instructions/i5329
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How our partner relationships workCode meanings are read from the IRS Instructions for Forms 1099-R and 5498 (current edition, tax year 2026), Table 1, Guide to Distribution Codes, at irs.gov on September 28, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer or the IRS is the right place to confirm anything consequential.