Maryland roth conversion

[catherinerust]

Turbotax shows an underpayment penalty under my Maryland tax return for my December roth ira conversion. Despite the fact that conversion tax payments are not due until the April 15th deadline, I paid the full tax amount to Maryland as a quarterly tax payment in december (MD did not process until january 4th).  Do state taxes treat tax due dates differently?  If not, is there a way I can remove this penalty from my MD tax return on Turbotax?  My federal return allowed me to not annualize my income on form 2210, but this did not seem to impact my state return.