More than likely, the IRS will send you letter notifying you that you owe a penalty for filing late. You should respond to them in writing and ask that they waive the penalty because you were unaware of the earlier deadline for partnership returns. There is a good change they will waive the penalty. If you file on or before April 15 your penalty will increase from $210 per partner to $420 per partner. The penalty is $210 for each month or part of a month (for a maximum of 12 months) the failure continues, multiplied by the total number of persons who were partners in the partnership during any part of the partnership's tax year for which the return is due.
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