Updated September 28, 2026. Quick answer: code 5 means the IRS treats your entire IRA as distributed, not just the amount you touched, after a prohibited transaction such as borrowing from the IRA or pledging it as loan collateral. The timing is the part people miss: under section 408(e)(2) the account stops being an IRA as of the first day of that tax year, and it is treated as distributing all its assets at their fair market values on that first day, not on the day of the transaction.
What the IRS tells the payer
From the current instructions, code 5 is “Prohibited transaction”. The full instruction text reads: “Use code 5 if there was a prohibited transaction involving the IRA account. Code 5 means the account is no longer an IRA.” It may be used with: None.
What counts as a prohibited transaction
The Instructions for Form 5329 describe the mechanism directly: “Certain prohibited transactions involving your IRA, such as borrowing from your IRA or pledging your IRA assets as security for a loan, are considered to be distributions and are generally subject to the additional tax on early distributions.” The transaction itself, not a later withdrawal, is what triggers the deemed distribution.
Which line it drives
Form 1099-R’s own recipient instructions say: “Report the amount on Form 1040, 1040-SR, or 1040-NR on the line for “IRA distributions” or “Pensions and annuities” (or the line for “Taxable amount”) and on Form 8606, as applicable.” That applies here even though no cash actually left the account: the deemed distribution is reported as though the full value had been paid to you.
The 10% additional tax
Because a prohibited-transaction distribution is deemed to occur under section 408(e)(2), the 5329 instructions place it inside the general early-distribution rule quoted above, so the 10% additional tax can apply if you are under 59½. In practice few of the 23 Form 5329 exceptions fit this class of forced, disqualifying event; the two that occasionally do are death (exception 04) or disability (exception 03) if the transaction happened to coincide with one of those. We could not find IRS guidance carving prohibited transactions out of the additional tax the way it does for corrective distributions or ESOP dividends, so we are not asserting one here.
Common mistakes
- Assuming only the dollar amount involved in the transaction is taxable. It is the entire account’s fair market value, measured on the first day of that tax year.
- Not realizing the account can no longer accept contributions or be treated as an IRA once the transaction has occurred.
- Dating the taxable event to when the 1099-R arrives rather than to the year the prohibited transaction actually happened.
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 K, and code 2, another way a distribution can become an early one.
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, the IRS Instructions for Form 5329 (2025), IRS Publication 590-B (2025) and 26 U.S.C. 408(e)(2) 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
- IRS, Publication 590-B (Distributions from IRAs), Prohibited Transactions, Effect on an IRA account: https://www.irs.gov/publications/p590b
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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.