What does IRS compliance mean?
James Craig
Published Mar 28, 2026
A compliance check is a review of information forms that the IRS requires taxpayer to file or maintain; for example, 940s, 941s, W-2s, 1099s, or W-4s. During a compliance check, the IRS may ask taxpayers whether they understand or have questions about the filing requirements for these forms.
How long does a tax compliance check take?
The HMRC Compliance Check Letter Certain information will be requested and this could be one of the following: accounts and calculations, company tax return and/or PAYE records and returns. The timescale is typically 40 days from the date of issue of the information notice.
Is a compliance check an investigation?
Although an HMRC compliance check might sound relatively informal, it is a formal tax investigation by another name. It is more serious than an enquiry into a tax return submitted by a taxpayer and HMRC will have cause to suspect tax has been underpaid before initiating a compliance check.
Do you have to withhold based on lock in letter?
However, if the revised Form W-4 results in less withholding, the employer must withhold based on the lock-in letter. The employee may contact the IRS to request a modification to the lock-in letter.
When does the IRS issue a lock in letter?
Background. The IRS reviews W-2 information to determine whether there has been serious underwithholding. If so, the IRS may issue a lock-in letter (Letter 2800C) to an employer, specifying the withholding rate and maximum number of withholding allowances to use for the employee (see Payroll Guide ¶4010).
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.