IRS notice decoder · Business accounts and employer notices
CP240: your employment tax return was changed to match W-2s and 1099-Rs
A CP240 says the IRS changed an employment tax return because it didn't match the W-2, 1099-R and similar forms filed. Pay or dispute by the date.
By the Carry Forward Learning team Reviewed by Hunter Nottingham, JD, CPA
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CheckedOct 19, 2026What a CP240 means
A CP240 says the IRS changed your employment tax return because it found differences between the return and the income and withholding reported on your Forms W-2 and 1099-R and similar wage and withholding forms. source 1
The usual cause is a mismatch between quarterly returns and year-end forms. We'd reconcile the year's Forms 941 against the W-3 totals before deciding whether the change is right.
The date that counts
Pay any balance by the date printed on the notice. If you disagree, the IRS page gives a set time from the date of the notice to contact it. source 1
Why people get one
- The totals on the employment tax return didn't match the W-2, 1099-R and similar forms for the year. source 1
First steps
- Read the notice for the period and the change. source 1
- Reconcile the employment tax returns with the W-2 and W-3 totals for the year.
- If the change is right, pay by the date on the notice or look at other ways to pay. source 1
- If you disagree, contact the IRS at the number on the notice, within the time its page gives. source 1
What not to do
- Don't pay without reconciling first; a mistake on the year-end forms can be the real problem.
- Don't pay through a link or phone number in an unexpected email or text. Use irs.gov, typed in yourself.
Keep reading
Questions
How can I find out which amounts didn't match?
The IRS says to call the number listed on your notice. source 1
Will there be a penalty if I can't pay in full?
There could be. The notice explains any penalty and how it was worked out. source 1
Sources
- IRS, Understanding your CP240 notice (external site) checked Oct 19, 2026
Every rule on this page comes from the IRS page in the list, read on the date shown. Your notice itself is the final word on its own dates and amounts.