老兄，你这个人思路很懒散。你有正常婚姻，head of household是给单亲父母的，你为什么要去用Head of Household？仅仅是因为你老婆没有ITIN，那么就去申请啊！因为你不去申请你就糊里糊涂用head of household，就是花精力把自己的财政混乱，IRS万一发现了也不认这个情，认为你错误了还要改正。
你思想方法就是懒人的，走正路稍微有点阻力你就像去抄近路走歪路，这辈子路还长，你这么下去怎么办？
如果ITIN来不及拿不到，等到四月份去申请一个extension of time，你就有六个月的时间准备。https://www.irs.gov/forms-pubs/extension-of-time-to-file-your-tax-return
但是，extention of time to file doesn't mean extension of time to pay your tax。如果你算好有钱要付，你还是要4/15前把钱交好。
你应该做的是：（1）apply for ITIN for everyone (2) fill out your tax return without ITIN, see if you owe tax or get refund (3) if you owe tax, pay it before 4/15 (4) file extension of time before 4/15 (5) file your tax return with ITIN before 10/15.
