What is an examination of your tax return?
Ava Robinson
Published Mar 02, 2026
An examination of your return reveals tax due for which a notice of deficiency (90-day letter) will be issued. After you and the IRS discuss the issues, the notice is prepared and reviewed. After the review process, issuing the notice of deficiency is a ministerial act.
What does 420 examination of tax return mean?
A transaction code (TC) 420 means that the return was pulled for a potential audit. The return was reviewed, and may or may not have been assigned for audit (in person or through correspondence.). A TC 421 would indicate that the audit was closed.
When to advise a client of an erroneous tax return position?
The Treasury Department on behalf of the IRS in Circular 230, Regulations Governing Practice Before the Internal Revenue Service (31 C.F.R. Part 10), likewise has articulated standards governing situations in which tax practitioners discover an error in the previously filed tax return of a client.
How are tax returns selected for an examination?
The scope of the examination is generally limited to the items on the classification checklist. Individuals are selected for office examinations when the present issue requires more than verification of records. Business returns may be selected because of the complex issues involved.
What to do if a tax preparer makes a mistake?
If the tax preparer recognizes a mistake he or she has made and calls it to the client’s attention, persuading the client to submit an amended return could help ameliorate the problem.
How to prepare for an IRS tax audit?
The representative and each taxpayer should execute a Form 2848 Power of Attorney for the tax years in question in order to communicate with the IRS. The representative and the taxpayer should carefully go over the details of the tax returns and ancillary issues to define and prioritize the goals of the client.