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Did he signed a client service agreement or similar form? Generally such agreement spells out that you are only liable for penalty and interest but not for his tax liability. He can sue you for damages but owed taxes are not considered a damage since the taxpayer would owe the taxes anyway.
I found this on a CPA website: Taxes . In general, the tax that a taxpayer owes does not constitute a recoverable damage component. Thus, if a tax practitioner’s mistake results in an understatement of tax, he or she is generally not liable for the additional tax due, although the practitioner might be held responsible for payment of related interest and penalties'
There's no law that would state that he cannot sue you for the taxes owed but in most likelihood the judge will not hold you liable unless the taxpayer can prove your negligence or fraud, which would be difficult to proof if it was a honest mistake.