Blood Pressure Medications, Calcium Channel Blockers --Magnesium may increase the likelihood of negative side effects (such as dizziness, nausea, and fluid retention) from calcium channel blockers (particularly nifedipine or Procardia) in pregnant women.
If you form a corporate entity for your small business, regardless of whether it's taxed as a C or S corporation, a tax return must be filed with the Internal Revenue Service on its due date each year. Corporate tax returns are always due on the 15th day of the third month following the close of the tax year. The actual day that the tax return filing deadline falls on, however, isn't the same for every corporation.
April 18, 2017 1  â. Deadline for filing a 2016 personal, or calendar year estates/trusts tax returns or extension. 2  Deadline for filing a C-Corp in a calender year. 3  Due date for first installment of 2017 estimated tax payments.