Missing these tax deadlines could result in additional charges from tax authorities in the form of penalties and interest fees.
Date Tax
12/15/2011 Monthly 941 EFTPS payment for November
12/15/2011 Colorado withholding tax for November if paid monthly
12/20/2011 Monthly sales tax report for November
12/31/2011 Monthly OPT tax report for November
1/15/2012 Final 2011 estimated tax payment
1/15/2012 Colorado withholding tax for December if paid monthly
1/20/2012 Monthly sales tax report for December
1/20/2012 Quarterly sales tax report for 4th quarter
1/31/2012 Monthly OPT tax report for December
1/31/2012 4th quarter OPT tax report if not filed monthly
1/31/2012 4th quarter 941 tax payment if under $2500
1/31/2012 4th quarter 941 payroll report
1/31/2012 2011 annual 940 payroll report
1/31/2012 W2′s and 1099′s due to recipients
1/31/2012 4th quarter Colorado Unemployment report
1/31/2012 4th quarter Colorado withholding if paid quarterly
2/15/2012 941 EFTPS payment for January
2/15/2012 Colorado withholding tax for January if paid monthly
2/20/2012 Monthly sales tax report for January
2/28/2012 Government copies of W2′s & 1099′s
2/28/2012 Monthly OPT tax report for January
3/15/2012 Corporate tax returns or extensions
3/15/2012 941 EFTPS payment for February
3/15/2012 Colorado withholding tax for February if paid monthly
3/20/2012 Monthly sales tax report
3/31/2012 Monthly OPT tax report for February
4/15/2012 Individual and Partnership tax returns or extensions
4/15/2012 941 EFTPS payment for March
4/15/2012 Colorado withholding tax for March if paid monthly