No one likes to deal with taxes, especially if you’re late in filing. So keep track of your eBay business transactions and know when the deadlines are to file your taxes. Note: Please check with your state government offices for due dates on sales taxes and license fees.

15th of every month: Prior month payroll tax deposit date (if you're on the monthly deposit system)
January 15: Estimated taxes due
January 31: Last day to distribute 1099s and W2s to people you paid during the prior year
January 31: Payroll reports for quarterly period ending 12/31 due
February 28: Last day to send the government copies of your 1099s and W2s
March 15: Calendar year corporation tax due
April 15: Deadline for Individual or Partnership Annual Tax return or deadline to file an extension
April 15: Estimated taxes due
April 30: Payroll reports for period ending 3/31 due
June 15: Estimated taxes due
July 31: Payroll reports for quarterly period ending 6/30 due
September 15: Estimated taxes due
October 31: Payroll reports for quarterly period ending 9/30 due

If the due date falls on a weekend or a federal holiday, the due date is the first business day after that date.