https://ttlc.intuit.com/community/get-started-in-community/discussion/turbo-tax-error-message/01/3806326#M16064 <P>I am running Turbo Taz Deluxe for Desktop (Win 11) 2025.&nbsp; I have enter all of my Federal data.&nbsp; Now when opening Turbo Tax I get the following error message:</P><P>&nbsp;</P><P>System.Runtime.Serializaton.SerializationException:...</P><P>&nbsp;</P><P>When at the point of reviewing my Federal forms, TT again checks for software updates, gets the same error message, and It won't go any further.&nbsp; I have seen this error posted from others, but have not seen a solution.</P><P>&nbsp;</P><P>PaulNad</P> Sat, 28 Feb 2026 00:01:07 GMT PaulNad 2026-02-28T00:01:07Z https://ttlc.intuit.com/community/get-started-in-community/discussion/turbo-tax-error-message/01/3806326#M16064 <P>I am running Turbo Taz Deluxe for Desktop (Win 11) 2025.&nbsp; I have enter all of my Federal data.&nbsp; Now when opening Turbo Tax I get the following error message:</P><P>&nbsp;</P><P>System.Runtime.Serializaton.SerializationException:...</P><P>&nbsp;</P><P>When at the point of reviewing my Federal forms, TT again checks for software updates, gets the same error message, and It won't go any further.&nbsp; I have seen this error posted from others, but have not seen a solution.</P><P>&nbsp;</P><P>PaulNad</P> Sat, 28 Feb 2026 00:01:07 GMT https://ttlc.intuit.com/community/get-started-in-community/discussion/turbo-tax-error-message/01/3806326#M16064 PaulNad 2026-02-28T00:01:07Z https://ttlc.intuit.com/community/get-started-in-community/discussion/re-turbo-tax-error-message/01/3806514#M16065 <P>I followed the link suggested, asked the question there and found another forum entry with the same question.&nbsp; I followed the steps details and it seems to have fixed the issue.</P> Sat, 28 Feb 2026 01:41:51 GMT https://ttlc.intuit.com/community/get-started-in-community/discussion/re-turbo-tax-error-message/01/3806514#M16065 PaulNad 2026-02-28T01:41:51Z