You could file without Form 3800 and then file an amended return, or you can wait until the form is available.
If you are a qualifying farmer, you have to file and pay any tax due by March 1 to avoid an underpayment of tax penalty. If you don't file and pay by March 1, then you may be subject to an underpayment penalty; however, the April 18th filing deadline is still applicable and your return will not be late unless you fail to file your return, or an extension by that due date.
The penalty for underpayment of estimated tax equals the amount of the underpayment for the period of underpayment multiplied by the applicable underpayment rate, which is three percentage points above the federal short-term interest rate. IRC § 6621(a)(2). IRS determines this rate every quarter, but the rate that applies to a calendar-year qualifying farmer’s underpayment is the rate for the first quarter of the year following the tax year under which the tax liability arose. Because the federal short term interest rate for quarter one of 2021 was zero, the penalty rate for the first quarter of 2021 is three percent.
For example, lets say you owe $14,000 in tax and don't pay until April 18:
$14,000 (estimated tax liability) x 90/365 (days delinquent / days in the year) x .03 (underpayment rate) = $104.
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