You cannot attach documents in TurboTax- you will have to print and mail the abatement requests . There is no formal format, so you can write it on a blank sheet of paper.
Underpayment of estimated tax Sec. 6654 provides for an underpayment penalty if not enough estimated taxes are paid by individuals, estates, and trusts throughout the year. Sec. 6655 applies a similar penalty for corporations that fail to pay enough taxes throughout the year. The penalty may apply even if the IRS owes the taxpayer a refund. The penalty is calculated based on the amount of the underpayment, the period when the underpayment was due and underpaid, and the interest rate for underpayments that the IRS publishes quarterly. These penalties cannot be removed for reasonable cause. IRS penalties, abatements, and other relief