Somewhere on your pay stub there may be a small line adding a few dollars to your taxable wages for life insurance you never bought, never chose, and will never receive a penny from while you are alive.
It is not an error. It is imputed income, and once you understand the concept you will start noticing it in several places on your stub. It also carries a quirk that catches people at filing time: part of it is withheld against and part of it is not.
Quick answer
Imputed income is the taxable value of a non-cash benefit your employer provides. The most common example is group term life insurance above $50,000 of coverage. The first $50,000 is tax free, and the value of anything above it becomes taxable wages calculated from an IRS table based on your age.
No money changes hands. The amount simply gets added to your wages so it can be taxed.
Where the $50,000 comes from
Section 79 of the tax code excludes the first $50,000 of group term life coverage provided under a policy carried directly or indirectly by an employer. Below that figure there are no tax consequences at all.
Above it, the value of the excess coverage has to be included in income. Crucially, the taxable value is not what your employer actually pays for the policy. The IRS mandates a standard table, so two employees with identical coverage are taxed identically regardless of how good or bad a deal their employer negotiated.
The table, and the arithmetic
Uniform Premium Table I gives a monthly cost per $1,000 of excess coverage, banded in five year age brackets. The rates have been unchanged since 1999.
| Age | Cost per $1,000 per month | Age | Cost per $1,000 per month |
|---|---|---|---|
| Under 25 | $0.05 | 50 to 54 | $0.23 |
| 25 to 29 | $0.06 | 55 to 59 | $0.43 |
| 30 to 34 | $0.08 | 60 to 64 | $0.66 |
| 35 to 39 | $0.09 | 65 to 69 | $1.27 |
| 40 to 44 | $0.10 | 70 and over | $2.06 |
| 45 to 49 | $0.15 |
The calculation is: take your total coverage, subtract $50,000, divide by 1,000, multiply by your age rate, multiply by the number of months.
An employee aged 57 with $200,000 of employer-paid coverage has $150,000 of excess. That is 150 units at $0.43 a month, or $64.50 a month, giving $774 of imputed income for the year.
Notice what happens as you get older. The same coverage that cost a 35 year old $135 a year in imputed income costs the 57 year old $774, and someone at 68 would face $2,286. Nothing about the benefit changed. The table did. This is the reason the line on your stub grows over a career without anyone telling you why.
The withholding split that trips people up
Here is the part worth knowing, because it behaves unlike almost anything else on your stub.
| Tax | Applies? | Withheld from your pay? |
|---|---|---|
| Social Security and Medicare | Yes | Yes, and your employer pays a matching share |
| Federal income tax | Yes, it is taxable income | Generally not |
| Federal unemployment tax | No | Not applicable |
Read the middle row twice. The imputed amount lands in Box 1 of your W-2 as taxable wages, so income tax is owed on it, but income tax is generally not withheld against it during the year. The gap is small for most people, since $774 of extra income at a 22% rate is around $170. But it is a shortfall, and it sits alongside every other small shortfall in the same return.
There is a timing problem too. Employers only have to run this calculation once a year. Those that leave it to December can land the entire year’s imputed income and its FICA on a single December paycheck, which is a poor month to discover a smaller net deposit. Employers who spread it across the year avoid that, and there is nothing you can do about which approach yours takes except know to expect it.
Where it appears on your W-2
The imputed amount is included in Box 1, Box 3 and Box 5, and reported separately in Box 12 under code C. If you want to check what your employer charged you for the year, code C is the figure.
Two further codes matter to people who have left. When coverage continues for a former employee or retiree, there is no paycheck to withhold FICA from, so the uncollected Social Security tax is reported under code M and uncollected Medicare tax under code N. Those amounts are settled on your Form 1040, which surprises retirees who assumed their tax affairs with a former employer were finished.
Two traps worth knowing
Spouse and dependent coverage. Employer-paid life cover on a spouse or child is excluded as a de minimis benefit only if the face amount does not exceed $2,000. Go over that and the full cost becomes taxable, not merely the excess above $2,000, and income tax withholding does apply. The cliff behaves quite differently from the $50,000 threshold on your own coverage, so a small increase in a spouse’s coverage can produce a disproportionate result.
Plans that favour key employees. If a plan discriminates in favour of owners, officers or highly compensated employees, those key employees lose the $50,000 exclusion entirely and are taxed on the greater of the Table I cost or the actual cost. This is an employer design issue rather than something an individual controls, but it explains why an executive’s imputed income line can look wildly different from a colleague’s.
A third situation, called a straddle, arises where employees pay for coverage and the pricing means some pay more and some less than the Table I cost. That can pull employee-paid coverage into the imputation rules even though the employer contributes nothing.
The other imputed income on your stub
Once you know the concept, several other lines make sense. Personal use of a company vehicle, gym memberships, employer-provided housing beyond narrow exceptions, health coverage for a domestic partner who is not a tax dependent, and gift cards or cash equivalents of any value all create imputed income.
The pattern is consistent: if your employer gives you something of value that is not cash and no specific exclusion applies, the value becomes taxable wages. Genuinely small non-cash items like occasional coffee or an award mug fall under a de minimis exception. Cash and gift cards never do, regardless of amount.
What to do about it
- Find the line on your stub and check it against the table for your age band and coverage level.
- Remember your birthday moves you into a new bracket at 5 year intervals, and the jumps get steep after 50.
- If your employer offers supplemental coverage above the basic amount, weigh whether you need it, since declining excess coverage removes the imputed income with it.
- If you are near a shortfall at filing, this is one of the small items contributing to it, and the fix is the same as always, which is Step 4(c) on your W-4. See The W-4 Problem.
- Check Box 12 code C on your W-2 against your own calculation, and codes M and N if you have left an employer whose coverage continues.
None of this is a reason to decline life insurance you need. The tax on the benefit is a fraction of the value of the benefit. It is simply worth understanding a line that otherwise looks like a payroll mistake. For the rest of the stub, see How to Read Your Pay Stub and Gross vs Net Pay.
Sources and notes
The $50,000 exclusion, the requirement to value excess coverage using the IRS Premium Table, and the application of Social Security and Medicare taxes follow IRC section 79 and IRS guidance on group-term life insurance. Table I rates follow Treasury regulations effective July 1, 1999. W-2 reporting under codes C, M and N follows the 2026 General Instructions for Forms W-2 and W-3. The $2,000 de minimis threshold for spouse and dependent coverage and the key employee rules follow IRS Publication 15-B.
Whether an employer withholds federal income tax on imputed income is generally at the employer’s option, so practice varies. Plan design, discrimination testing, and the treatment of employee-paid coverage differ between employers. This article is for general educational purposes only and should not be treated as personal tax, benefits, insurance, or financial advice.
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