What causes IRS lock-in letter?
James Craig
Published Mar 05, 2026
If we determine an employee does not have enough withholding, we’ll send you a lock-in letter stating the maximum number of withholding allowances permitted for the employee. You must withhold tax as indicated in the lock-in letter by the date specified unless we notify you otherwise.
Can IRS change my withholdings?
What happens if the IRS determines that I do not have adequate withholding? We can tell your employer to withhold federal income tax at an increased rate. We do this by issuing a “lock-in letter.” At that point, your employer must disregard any Form W-4 that decreases the amount of your withholding.
How do you calculate withholding allowances?
Compare the adjusted wage amount to the appropriate wage bracket table in IRS Publication 15-T, and record it as the tentative withholding amount. Divide the amount specified in Step 3 of your employee’s Form W-4 by your annual number of pay periods. Subtract this amount from the tentative withholding amount.
How is the IRS Withholding compliance program created?
Withholding Compliance Program. This program was created to help increase the effectiveness of IRS actions on under withheld tax compliance cases. The Withholding Compliance Program analyzes wages and tax information on past W-2s to determine if individual taxpayers have had their taxes correctly withheld.
Is the IRS Withholding letter 2800c still being issued?
The IRS Payroll News Issue 2020-03 (March 4, 2020) notes that “until the redesigned Letters 2800C and 2808C are cleared for publishing, the IRS Withholding Compliance Unit will continue to issue the Withholding Compliance Lock-in Letters using the old allowance withholding method and employers should follow the letters as directed.”
Can a employer decrease withholding rate without IRS approval?
An employer may not decrease the withholding rate without IRS approval. Electronic Form W-4 systems that permit employees to submit or change Forms W-4 online must be capable of blocking changes from employees for whom a lock-in letter has been received. IRS Letters 2800C and 2808C are being redesigned to include the new lock-in instructions.
Is there a change in the IRS Withholding requirement?
A9: There is no change in the requirement that employees have adequate income tax withholding. The IRS Tax Withholding Estimator is available to help employees determine the proper amount of federal income tax withholding.