quarterly estimated taxes are due 4/15, 6/15, 9/15 and 1/15 of the following year. should the date fall on a weekend or holiday you get until the next business day. you have to estimate you income and self-employment taxes for the year and pay 1/4 on each of those dates. there is also an annualization method where
income for each quarter is annualized taxes are computer and the the taxes are deannualized
for the 4/15 the income and expenses (including standard deduction are for 1/1 to 3/31
for 6/15 1/1 thru 5/31
for 915 1/1 thru 8/31
for 1/15 the entire year
if your asking how to compute these taxes. TT 2018 has an estimated tax section for 2019
there are also calculators available on the web but be careful. couldn't say if any are illegitimate, but if they ask for your SSN or other personal info avoid them
