1. Income Tax Return (Form 1040) Filing Deadline
   
   

   • Due Date: April 15 (or the next business day if it falls on a weekend or holiday)

   • Extension: You can request an extension to October 15, but payment must still be made by April 15 to avoid penalties.

2. Estimated Tax Payments
   
   

   • Due Date: April 15, June 15, September 15, and January 15 of the following year (for the next quarter)

   • Purpose: Quarterly payments for self-employed individuals or those with significant income not subject to withholding.

3. IRA Contribution Deadline
   
   

   • Due Date: April 15 (or the next business day if it falls on a weekend or holiday)

   • Purpose: Last day to make contributions for the previous tax year.

4. Tax Filing for Non-Residents (Form 1040-NR)
   
   

   • Due Date: June 15 for U.S. citizens living abroad, or April 15 for non-resident aliens, unless they are self-employed, in which case the deadline is June 15.

Corporation Tax Returns (Form 1120)

• Due Date: April 15 (for calendar year taxpayers) or the 15th day of the 4th month after the end of the corporation's fiscal year.

S-Corporation Tax Returns (Form 1120-S)

• Due Date: March 15 (for calendar year taxpayers) or the 15th day of the 3rd month after the end of the S-Corp's fiscal year.

Partnership Tax Returns (Form 1065)

• Due Date: March 15 (for calendar year taxpayers) or the 15th day of the 3rd month after the end of the partnership's fiscal year.

Self-Employed Individuals (Schedule C with Form 1040)

• Due Date: Same as individual returns (April 15) or with extensions.

Estimated Tax Payments for Businesses and Self-Employed Individuals

• Due Date: April 15, June 15, September 15, and January 15 (next year)

• Purpose: Quarterly payments for income not subject to withholding, including self-employed income.

Employer's Federal Unemployment (FUTA) Tax (Form 940)

• Due Date: January 31 (for the previous year). If you deposited all your FUTA taxes on time, the due date is February 10.

Quarterly Payroll Tax Filing (Form 941)

• Due Dates:

  • 1st Quarter: April 30

  • 2nd Quarter: July 31

  • 3rd Quarter: October 31

  • 4th Quarter: January 31 (of the following year)

Small Business Payroll (Form 944)

• Due Date: January 31 (if annual filing is required for small businesses).

Estate and Trust Tax Returns (Form 1041)

• Due Date: April 15 (for calendar year filers), or the 15th day of the 4th month following the end of the fiscal year for fiscal year filers.