If at least 2/3 of your gross income for the current or preceding tax year is from farming and you file your tax return and pay the entire tax due by March 1 of the following year, you generally do not need to make an estimated tax payment. If March 1 falls on a weekend or legal holiday, you have until the next business day to file and pay tax.
If you are a calendar year taxpayer and you do not choose to file your tax return by March 1st:
You will have only one estimated tax payment that is due by January 15th of the following tax year.
You will follow the General estimated tax rules except that you substitute 66-2/3% for the “90%” of the tax shown on your current year’s tax return.