It says:
IMMEDIATE ACTION REQUIRED: A review of your Indiana sales tax for the tax period July 31, 2015 shows you may own $555.18 including penalty and interest. YOU MUST TAKE ACTION IMMEDIATELY TO RESOLVE THIS TAX DEBT. You must pay the amount owned no later than January 4, 2016, or you may protest this tax assessment within 60 days (by the due date listed here and below). If you fail to do either, this tax debt will continue to accrue interest and could ultimately convert into a tax warrant for collection action.
the back of the paper says
YOU HAVE FAILED TO SUBMIT THE APPROPRIATE TAX FORM AND THEREFORE THIS NOTICE IS AN ESTIMATED AMOUNT DUE BASED UPON THE BEST INFORMATION AVAILABLE. IF YOU DO NOT OWE THIS FOR ANY OF THE REASONS LISTED, YOU MUST SUBMIT ONE OF THE FOLLOWING IN ORDER TO CLEAR THIS.
1. A COPY OF THE TAX RETURN AND THE FRONT AND BACK OF YOUR CANCELLED CHECK, IF PAID.
2. IF THERE WAS NO ACTIVITY THAT OCCURRED WITH YOUR BUSINESS, YOU ARE STILL REQUIRED TO FILE TAX RETURNS FOR THE PERIODS INDICATED
3. IF THE BUSINESS WAS CLOSED, THE RESPONSIBLE OFFICER OF THE CORPORATION, PARTNER, OR SOLE PROPRIETORSHIP MUST SUBMIT A COMPLETED INDIANA FORM BC-100.
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