Updated August 3, 2026. Quick answer: code 1 means your custodian did not know whether an exception applied — it does not mean you owe the 10% additional tax. The IRS tells payers to use code 1 even when a real statutory exception applies, and leaves it to you to claim it on Form 5329.
What the IRS tells the payer
From the current instructions, code 1 is “Early distribution, no known exception”. The full instruction text is what the custodian is following when it picks this code.
The exceptions a code 1 can still hide
The instructions list them explicitly as things that still get a code 1: medical expenses, health insurance premiums, qualified higher education expenses, a first-time home purchase, a qualified reservist distribution, a qualified birth or adoption distribution, an emergency personal expense distribution, an eligible distribution to a domestic abuse victim, a terminally ill individual distribution, a qualified disaster recovery distribution, and a qualified long-term care distribution.
If any of those describes your distribution, the code is not wrong — it is simply uninformed, and the fix is on your return rather than with the custodian.
The other thing code 1 signals
The instructions also require code 1 where a taxpayer 59½ or older modifies a series of substantially equal periodic payments before the end of the five-year period. That is a busted 72(t) — what happens then, and the five-year rule that triggers it.
Box 7 is the payer’s claim, not the law
The code in Box 7 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.
In other words the IRS expects the payer to report a distribution as unexcepted when the payer simply does not know, and expects you to claim the exception on your return. That is what Form 5329 is for, and it is the single most useful thing to understand about this form.
Every code in one place: the Box 7 table. If yours looks wrong: how to fix it.
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Code 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 August 3, 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.