TRANSACTION CODES
Freeze codes
Item/Credit Reference Numbers
Define Various Codes
IAT
100

TC 150

What is return filed and tax liability assessed

100

-L Freeze 

what is an Account selected for Audit freeze

100

 888

What is an Adjust Gross Income 

100

Source Code 2

What is We changed your [YYYYXX] account to correct your [RC].

100

The tool used to verify whom you're speaking with

What is the Disclosure tool 

200

TC 806

What is credit for withholding taxes/excess fica 

200

-Z Freeze

what is a criminal investigation freeze code

200

 886

What is Taxable Income

200

Hold code 

what does it mean when it is desired to prevent or delay the issuance of a refund and/or notice, such as when a particular adjustment action is cycled, or when a correction is being made to an account without the taxpayer’s knowledge.

200

This tool allows money to be moved from one account to another

What is the credit transfer tool

300

TC 290

What is an additional tax assessment

300

-A freeze 

What is a duplicate return freeze

300

764

what is an Earned Income Credit increase

300

Reason Code 036

What are tax credits

300

This tool allows you to research most codes found in IDRS

What is the CSI tool

400

TC 670

What is a subsequent payment

400

-G freeze 

what is a Math Error freeze

400

766

What is a substantiated credit increase

400

Source Code 1

What is As you requested, we changed your account for [YYYYXX] to correct your [RC].

400

This tool allows you to send a taxpayer a letter

What is the letter tool

500

TC 610

What is a payment with the return

500

N- freeze

What is a notice status account

500

256

What is a recovery Rebate Credit

500

Reason Code 051

What is federal income tax withheld

500

The tool used to assist with closing out a Tax Delinquent Return

What is FRM49

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