You can only claim a roommate as a dependant if the roommate really is financially dependant on you. That would mean that you are providing more than half the room mate's financial support and no one else is claiming the room mate as a dependant.
Yes, you can claim a qualifying dependent.
You may never claim your spouse as a dependent. You may, however, claim a standard exemption for your spouse if she does not have to file and you are not filing jointly (and as long as no one else is claiming her as a dependent).
If the "dependent" brother is under 19 and is not a full time student then you can not claim him as a dependent and you can not claim Head of Household status. How old is this brother?
I would yes
If they aren't a qualified child or a qualified relative, as defined, you can't claim them.
Yes, you can claim a qualifying dependent.
Yes you can claim anyone as a dependent if there living under your roof.
You may never claim your spouse as a dependent. You may, however, claim a standard exemption for your spouse if she does not have to file and you are not filing jointly (and as long as no one else is claiming her as a dependent).
If the "dependent" brother is under 19 and is not a full time student then you can not claim him as a dependent and you can not claim Head of Household status. How old is this brother?
I would yes
You can claim them if you provided for the person the year you want to claim him or her.
If they aren't a qualified child or a qualified relative, as defined, you can't claim them.
No, you cannot claim single head of household unless someone you claim as a dependent lives in your home.
No
No, sorry. You can only claim someone related to you as a dependent.
No, medical expenses for a dependent can only be claimed by the person who is claiming him or her as a dependent.
You are not eligible to claim yourself as a dependent on your federal taxes -- ever. However, you are allowed to claim a personal exemption for yourself if and only if no one else can claim you as a dependent, whether or not they actually claim you.