If she forged the document, that is how it would be done without knowledge;
That is a criminal offense so there are 2 ways to recover:
1. filing a criminal complaint with the local police (forgery, identity theft); if convicted, the defendant is normally required to pay restitution to the victim (reimbursement for financial damages)
2. filing a civil suit for fraud and constructive trust; if proven, this will result in the award of monetary damages- and may include the award of attorney fees and costs.
This covers the innocent spouse doctrine but that would only apply if the forgery occurred during the marriage (while a decree was pending): https://www.irs.gov/irm/part25/irm_25-015-001.html
Meanwhile one can request copies of the amended documents from the IRS to determine what actually was amended, then if need be one can then ask the IRS to reinstate the original tax return and disregard the forged one.
Further questions? Please post here to continue the chat.
Satisfied? Kindly rate positively so I receive credit for assisting you.
(no additional charges are incurred).
Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.