Get your taxes done using TurboTax

If you mailed in the return you were supposed to sign the form 1040 so sign it and return the paper copy as the IRS is requesting.    The form 8879 is only used by paid tax pros when they efile a return to capture your ink signature to keep in their files.. it is not used by the Turbotax program.      Did you mail in the 8879 form by accident ?   Did you use turbotax to complete a DIY return or did you use a paid tax pro ?