When comparing himself to Willie Nelson, Hank mentions Nelson's troubles with the IRS, then how he himself spent quite a bit of time filling out his tax return, and finishes off with a grumble about the IRS 1040EZ form. However, Hank would not file a 1040EZ for several reasons:
1] There is no mortgage interest deduction, assuming Hank and Peggy's mortgage is large enough to qualify.
2] There is no allowance for the educator expense deduction which Peggy might be entitled to if (among other things) she worked 900 hours in a school year.
3] You cannot claim a dependant such as Bobby, or possibly Luanne.