I have a different answer.
Regarding taxes, IRS pub 559 states specifically that you are personally responsible for any additional taxes due.
However, there is a process for requesting discharge. Use form 5495
See this, (directly from Pub. 559)
As the personal representative for the decedent's estate, you are responsible for any additional taxes that may be due. You can request prompt assessment
of any of the decedent's taxes (other than federal estate taxes
) for any years for which the statutory period for assessment is open. This applies even though the returns were filed before the decedent's death.
Failure to report income. If you or the decedent failed to report substantial amounts of gross income (more than 25% of the gross income reported on the return) or filed a false or fraudulent return, your request for prompt assessment will not shorten the period during which the IRS may assess the additional tax. However, such a request may relieve you of personal liability for the tax if you did not have knowledge of the unpaid tax.
Request for discharge from personal liability for tax. An executor can make a request for discharge from personal liability for a decedent's income, gift, and estate taxes. The request must be made after the returns for those taxes are filed. To make the request, file Form 5495. For this purpose, an executor is an executor or administrator that is appointed, qualified, and acting within the United States.
Within 9 months after receipt of the request, the IRS will notify the executor of the amount of taxes due. If this amount is paid, the executor will be discharged from personal liability for any future deficiencies. If the IRS has not notified the executor, he or she will be discharged from personal liability at the end of the 9-month period.