under the 110% rule, 27.5% (1/4) must be paid each tax period
they are 3/31, 5/31,8/31 and 12/31
for withholding you can use actual for each period or 1/4 of the annual total.
for estimated tax payments, they must be paid on or before the due date for each period. thus 4/15, 6/15, 9/15, and 1/15 of following year.
the 110% rule only applies if your prior year adjusted gross income was over $150K ($75K if married filing separately) otherwise it's 100%
https://www.irs.gov/payments/underpayment-of-estimated-tax-by-individuals-penalty
this statement is not entirely correct
Your filed tax return shows you owe less than $1,000
in truth, only withholding is applied to your tax liability to determine if you owe this amount or less.
you can use the annualized income installment method. however here's something I found about whn S-corp income is deemed earned
Corporations: Under Secs.1366(a)(1) and 1377(a)(1), S corporation income or loss is passed through to shareholders on a daily basis. For estimated tax payment purposes, IRS Letter Ruling 8735014 states that S shareholders must take into account their pro rata share of the S corporation's actual taxable income for any S corporation year ending with or within their tax years to the extent that taxable income or loss was attributable to the months in the S corporation's tax year that ended on or before the due date of the payment period. The shareholder computes the amount of the S corporation's income or loss for a given period as if the S corporation's tax year ended on the last day of the payment period.
https://www.taxnotes.com/research/federal/irs-private-rulings/letter-rulings-technical-advice/indivi...
