Line 5a on Form 1040 is where you enter the gross pension or annuity distribution from Box 1 of your Form 1099-R, but only when the distribution is partially taxable, a rollover, or a qualified Roth payment. If your pension is fully taxable, the IRS instructions tell you to skip Line 5a and enter the full amount on Line 5b alone.1Internal Revenue Service. Instructions for Form 1040 Getting that distinction wrong is one of the most common ways to trigger an IRS notice on a return that owes no extra tax.
What Line 5 Covers
Lines 5a and 5b are for pensions, annuities, and distributions from employer-sponsored retirement plans: 401(k), 403(b), and governmental 457(b) accounts.1Internal Revenue Service. Instructions for Form 1040 Designated Roth accounts inside those employer plans also belong on Line 5.
IRA distributions do not. Traditional IRA, Roth IRA, SEP IRA, and SIMPLE IRA payments all go on Lines 4a and 4b instead.1Internal Revenue Service. Instructions for Form 1040 The 1099-R itself will not tell you which line to use; the source of the money does. Employer plan goes on Line 5, IRA goes on Line 4. If you have distributions from both, fill in both sets of lines using separate 1099-R forms.
The 1099-R Boxes That Feed Line 5a
Every pension or annuity distribution generates a Form 1099-R from the plan administrator.2Internal Revenue Service. Form 1099-R 2025 Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc. Three boxes drive your Line 5 reporting.
Box 1 (Gross Distribution) is the total amount distributed to you during the year, before any withholding. This is the figure that goes on Line 5a when Line 5a applies. Always the gross, never the net you actually received.3Internal Revenue Service. 2025 Instructions for Forms 1099-R and 5498
Box 2a (Taxable Amount) is the plan administrator’s calculation of the taxable portion. It may be blank or say “Taxable amount not determined” if the administrator did not have your full contribution records. When that happens, figuring the taxable amount falls to you.2Internal Revenue Service. Form 1099-R 2025 Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc.
Box 7 (Distribution Code) tells you and the IRS what kind of distribution this was. Code 1 is an early distribution with no known exception. Code 7 is a normal distribution at age 59½ or later. Code G means a direct rollover to another eligible plan. Code 4 signals a payment to a beneficiary after death, and Code 3 indicates a disability distribution.3Internal Revenue Service. 2025 Instructions for Forms 1099-R and 5498
If you received distributions from more than one employer plan during the year, you will get multiple 1099-R forms. Add the Box 1 amounts from the pension and annuity 1099-Rs together and enter the total on Line 5a.
When to Fill In Line 5a and When to Leave It Blank
Line 5a is not always required. The pattern is simple once you see it: Line 5a matters only when the gross distribution and the taxable amount are different numbers. When they are the same, the IRS just wants the single number on Line 5b.
Fully taxable pension. If your entire distribution is taxable (no after-tax contributions, no rollover, no exclusion), enter the full Box 1 amount on Line 5b only. Leave Line 5a blank. This is the most common situation for retirees receiving monthly checks from a traditional pension or a pre-tax 401(k).1Internal Revenue Service. Instructions for Form 1040
Partially taxable pension. If the payment includes a return of after-tax contributions or qualifies for an exclusion, enter the Box 1 total on Line 5a and the taxable portion on Line 5b.1Internal Revenue Service. Instructions for Form 1040
Rollover. Enter the full distribution on Line 5a and zero on Line 5b (assuming you rolled over the entire amount). Write “Rollover” next to Line 5b so the IRS knows why the taxable amount is zero.1Internal Revenue Service. Instructions for Form 1040
Qualified Roth 401(k) distribution. Enter the Box 1 amount on Line 5a and zero on Line 5b. A distribution from a Roth 401(k) or Roth 403(b) is fully tax-free if the account has been open for at least five tax years and you have reached age 59½, become disabled, or died.4Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts For a non-qualified Roth distribution, the earnings portion becomes taxable and should already be broken out in Box 2a.
Figuring the Taxable Amount When Box 2a Is Blank
When Box 2a shows a taxable amount, you can generally use that figure directly on Line 5b. When it is blank, the most common calculation you will need is the Simplified Method, used for any annuity with a starting date after November 18, 1996, where payments are based on life expectancy.5Internal Revenue Service. Publication 575 (2025), Pension and Annuity Income
The method divides your total after-tax investment in the plan by a number of anticipated monthly payments from an IRS table based on your age when payments began. For a single-life annuity, the table numbers are:5Internal Revenue Service. Publication 575 (2025), Pension and Annuity Income
- 55 or under: 360 payments
- 56 to 60: 310 payments
- 61 to 65: 260 payments
- 66 to 70: 210 payments
- 71 or older: 160 payments
Say you retired at 62 with $52,000 in after-tax contributions. Divide $52,000 by 260 to get a $200 monthly exclusion. Each month, $200 of your pension check is a tax-free return of basis, and the rest is taxable. Enter the full year’s pension payments on Line 5a and the taxable portion on Line 5b. Publication 575 walks through this with Worksheet A.
Once you have recovered your entire after-tax investment, every payment after that is fully taxable.5Internal Revenue Service. Publication 575 (2025), Pension and Annuity Income At that point you stop using Line 5a and report everything on Line 5b.
One warning: if Box 2a is blank, do not leave Line 5b blank. A blank there tells the IRS that none of the distribution was taxable, which is almost never true.
Reporting a Rollover on Line 5a
A rollover is not a taxable event when done correctly, but the 1099-R still shows a distribution. Line 5a is how you tell the IRS the money moved rather than disappeared.
Direct Rollovers
When funds move directly from one plan to another without you touching the money, the payer issues a 1099-R with Box 1 showing the gross amount, Box 2a showing zero, and Box 7 showing Code G.6Internal Revenue Service. Instructions for Forms 1099-R and 5498 (2025) Enter the Box 1 amount on Line 5a, zero on Line 5b, and write “Rollover” next to Line 5b.
60-Day Indirect Rollovers
If the plan pays the distribution to you personally, you have 60 calendar days to deposit the funds into another eligible retirement plan or IRA to avoid taxation.7Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions Enter the full Box 1 amount on Line 5a. If you completed the rollover within the deadline, enter zero on Line 5b with the “Rollover” notation. If you rolled over only part of the distribution, the portion you kept is taxable and goes on Line 5b.
The 20% Withholding Trap
When an employer plan pays an eligible rollover distribution directly to you, the administrator must withhold 20% for federal income tax.8eCFR. 26 CFR 31.3405(c)-1 – Withholding on Eligible Rollover Distributions On a $50,000 distribution, you receive $40,000 and the plan withholds $10,000. To complete a full rollover, you must deposit the full $50,000 into the new account within 60 days, replacing the withheld $10,000 from your own funds. If you deposit only the $40,000, the IRS treats the missing $10,000 as taxable. You would enter $50,000 on Line 5a and $10,000 on Line 5b. The withholding comes back as a credit elsewhere on the return, but the tax on the un-rolled amount stands. Direct rollovers avoid this problem because the mandatory 20% withholding does not apply.
The Public Safety Officer Exclusion and Line 5c
Retired public safety officers can exclude up to $3,000 per year from taxable pension income when the pension plan pays those funds directly toward health insurance or long-term care premiums for the officer, a spouse, or dependents.9Internal Revenue Service. Publication 575, Pension and Annuity Income You cannot also claim a medical expense deduction for the same premiums.
To report it, enter your total pension distributions on Line 5a and the taxable amount (after subtracting the excluded premiums) on Line 5b. Check box 2 for “PSO” on Line 5c.9Internal Revenue Service. Publication 575, Pension and Annuity Income The 1099-R will not reflect the exclusion, so Box 2a will be larger than what you enter on Line 5b.
Line 5a Errors That Trigger IRS Notices
Most Line 5 problems come from a short list of errors.
The most frequent is entering a fully taxable pension on Line 5a when it should appear only on Line 5b. It does not change your tax, but the IRS computer sees a mismatch between the two lines and flags the return.
Forgetting the “Rollover” annotation next to Line 5b is another reliable way to get a letter. Without it, the IRS has no reason to accept a zero taxable amount against a nonzero Line 5a, and the system will propose tax on the full distribution.
Reporting an IRA distribution on Line 5 instead of Line 4, or the reverse, creates a mismatch between your return and the 1099-R data the IRS already holds. So does entering a Box 1 figure net of withholding. Line 5a always shows the gross distribution, never the check you deposited.