Tuesday, September 15th is a big tax deadline.
- 3rd quarter estimated payments for individuals are due;
- 3rd quarter estimated payments for corporations are due;
- Calendar year corporate returns on extension are due (both C Corporations and S Corporations);
- Partnership and LLC returns on extension are due; and
- Trust/Fiduciary returns on extension are due.
For estimated payments you need to either have paid electronically (using EFTPS and/or your state’s electronic payment system, if available) or postmarked by the 15th. There are a few states which give a few extra days for estimated payments. For example, Hawaii gives you until the 20th.
For corporate, partnership, and LLC returns, you need to either have your returns electronically filed or postmarked by the 15th.
Trust and fiduciary returns need to be postmarked by the 15th.
Finally, if you use the US mail spend the extra $5.10 on certified mail, return receipt requested. It’s the only method you have of proving you timely filed your return.