Filing the Tax Return and Paying the Tax Liability. Wright Corporation's taxable in-come for calendar years 2016, 2017, and 2018 was $120,000, $150,000, and $100,000, respectively. Its total tax liability for 2018 was $21,000. Wright estimates that its 2019 taxable income will be $600,000, on which it will owe federal income taxes of $126,000. Assume Wright earns its 2019 taxable income evenly throughout the year.

a. What are Wright's minimum quarterly estimated tax payments for 2019 to avoid an underpayment penalty?

b. When is Wright's 2019 tax return due?

c. When are any remaining taxes due? What amount of taxes are due when Wright files its return assuming it timely paid estimated tax payments equal to the amount deter-mined in Part a?

d. How would your answer to Part a change if Wright's tax liability for 2018 had been $168,000?