IRS / Tax Error Codes Directory

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46 codes

Code	Short label	Link
150	Return filed	View
152	Refund freeze notice	View
154	Tax return processing	View
290	Additional tax assessed	View
291	Reduced tax assessed	View
300	Additional tax assessed	View
301	Reduced tax	View
420	Examination initiated	View
424	Examination referral	View
570	Additional account action pending	View
571	Issue resolved	View
572	Refund hold released	View
576	Fraud hold	View
670	Payment received	View
706	Interest adjustment	View
720	Accrued interest	View
766	Credit to account	View
768	Earned income credit	View
780	Credit transferred	View
810	Refund freeze	View
811	Freeze released	View
820	Credit offset	View
846	Refund issued	View
898	Treasury offset	View
971	Notice issued	View
977	Return amended	View
Amended return processing	Revised return under review	View
CP05 notice	Refund under review notice	View
CP12 notice	Math error correction notice	View
CP14 notice	Balance due notice	View
CP21 notice	Amended return adjustment notice	View
CP24 notice	Refund offset notice	View
IRS account adjustment	Account balance modified	View
IRS audit code	Examination initiated indicator	View
IRS identity verification	Identity confirmation required	View
IRS processing delay	Extended processing time	View
IRS refund delayed	Refund not issued within expected timeframe	View
IRS transcript update	Account activity posted	View
Refund approved but not sent	Payment not yet transmitted	View
Refund freeze lifted	Refund hold removed	View
Refund offset	Refund applied to debt	View
Refund rejected	Refund not approved for issuance	View
Refund still processing	Processing status ongoing	View
Tax refund pending	Refund not yet issued	View
Tax return under review	Return in review status	View
Tax topic 152	Refund processing information	View