Starting January 1, 2011, all PT-100 forms must be filed on-line Starting January 1, 2011, all existing BPP filers with the account closing period of December 31, 2010 or after MUST file online through SCBOS. Preprinted PT-100 returns will no longer be mailed.  SCBOS will be the required method for filing the PT-100 for businesses with an Account Closing Period of December 31, 2010 and thereafter. To file your form on-line click here   South Carolina Individual Income Tax returns TO CHECK THE STATUS OF YOUR SOUTH CAROLINA INDIVIDUAL INCOME TAX RETURN CLICK HERE