I probably should have mentioned that the partner with the higher income does not have to be head of household, what counts is who pays the household expenses. So if the partner with higher income uses the money for savings or non-household expenses, then the partner with lower income might legitimately be the person who is head of household for tax purposes.
I also should mention that since you need to file 2 tax returns and have several combinations of status and dependents to test, you might want to buy turbotax on a CD or as a download to install on your own computer. It will probably be more cost effective than filing online, unless you qualify for free filing. Discounted copies are available for purchase or download from reputable retailers like Amazon, Staples, Best Buy, Costco, and others.
