What the Retirement Distribution Form Is Telling You
Every retirement account distribution generates a form in January, and most people hand it straight to a preparer without reading it. Two boxes on it decide a great deal: one says how much is taxable, and another says whether the payer actually calculated that or simply repeated the gross amount. Where the second box is ticked, the taxpayer owes the work — and doing it is frequently worth real money.
- Box 1 is gross, box 2a taxable:: They are frequently the same figure even when they should not be.
- Box 2b means unverified:: The payer is saying it did not compute the taxable amount.
- Box 7 drives the penalty:: The distribution code determines whether an early withdrawal penalty applies.
- Rollovers still generate a form:: A rollover appears on the form and must be reported even though no tax is due.
Where the AI summary above gets this wrong
"The taxable amount on your 1099-R is the number to put on the return."
That's surface-true. Here's what it misses:
- The payer frequently has no way of knowing the taxable amount — An IRA custodian does not know how much after-tax basis you have across all your IRAs, because basis is tracked by the taxpayer on their own return. So box 2a is filled with the gross amount and box 2b is ticked to say the figure was not determined. Copying box 2a onto the return in that case pays tax on money that was already taxed.
- The distribution code decides the penalty, and codes get entered wrongly — Box 7 tells the IRS whether the distribution was normal, early, a rollover, a disability distribution or a series of substantially equal payments. A wrong code produces a penalty notice, and the fix is to ask the payer for a corrected form or to claim the exception explicitly on the return.
- A rollover that was never taxable still has to be reported — A direct rollover produces a form with the gross amount in box 1 and a code showing what it was. Leaving it off the return because no tax was due generates a matching notice, since the IRS has the form and the return does not account for it.
01 What the boxes say
Box 1 is the gross distribution. Box 2a is the taxable amount as the payer understands it. Box 2b has two checkboxes: taxable amount not determined, and total distribution.
Box 4 shows federal tax already withheld, boxes 12 to 14 the state equivalents. Box 5 can show employee contributions or insurance premiums recovered tax-free, and box 9b the total employee contributions in a pension.
Box 7 is the distribution code, and it is the box the IRS reads first. It distinguishes a normal distribution from an early one, a rollover, a conversion, a death distribution and several others.
Shows: the taxable share of a distribution where the account holds after-tax basis, using the pro-rata approach that applies across all your traditional IRAs. Ignores: that a workplace plan computes basis recovery differently, the treatment of a Roth account, and any withholding already deducted.
Source: About Form 1099-R
02 When the taxable amount is wrong
An IRA custodian sees only its own account. It does not know whether you made non-deductible contributions over the years, and those contributions are basis that comes back untaxed. So it reports the gross amount as taxable and ticks the box saying it did not determine the figure.
Recovering that basis is the taxpayer's job, done on the return by tracking cumulative basis and applying it proportionally across all traditional IRAs rather than to a single distribution.
The same applies to a pension where the employee contributed after-tax money. Part of each payment is a return of those contributions, recovered over an expected number of payments rather than all at once.
03 What to do when a form looks wrong
First establish whether the form is wrong or merely incomplete. A ticked box 2b is not an error — it is an invitation to compute the figure yourself. A wrong distribution code is an error.
For a wrong code, ask the payer for a corrected form. Where they will not issue one, the exception can be claimed on the return with the supporting explanation, which is a slower route to the same place.
Keep the forms. A basis figure carried forward year after year depends on a chain of returns, and reconstructing it from statements a decade later is the reason people end up paying tax twice on the same money.
The forms multiply where accounts have moved. A rollover from a workplace plan produces one from the old plan in the year it happens, and the receiving custodian issues its own for anything paid out later, so a single move can generate two forms in two different Januaries.
Look at box 2b before anything else. If it is ticked, the custodian is telling you it does not know what is taxable and has put the whole distribution in the taxable box to be safe. If you ever made a non-deductible contribution — and a lot of people did in years when they were over the deduction limit — some of that money is yours already. The tracking form runs with your return, not with the account, so nobody else is going to find it.
FAQ
What does the box 2b tick mean?
That the payer did not determine the taxable amount. It is common on IRA distributions, because the custodian does not know your after-tax basis, and the figure has to be worked out on your own return.
Why did I get a 1099-R for a rollover?
A rollover is still a distribution followed by a contribution, so a form is issued with a code showing what happened. It must be reported on the return even though no tax is due.
What if the distribution code is wrong?
Ask the payer for a corrected form. If they will not issue one, the applicable exception can be claimed on the return with an explanation.
Sources
Regulator references
- About Form 1099-R · Internal Revenue Service · 2026What the form reports and what each box contains.Last verified: 2026-09-07
- Publication 575: Pension and annuity income · Internal Revenue Service · 2026How the taxable amount is worked out where the form does not state it.Last verified: 2026-09-07
- Topic 410: Pensions and annuities · Internal Revenue Service · 2026The general treatment of the income the form reports.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.