Roughly calculation of number Im getting back of tax return?

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My fiance and I just bought a home this Aug 2006 and start payment right away. $1350/month including interest, property tax. My fiance gets even year to year from tax return. ( I mean everytime he files or claim a tax its either he gets only $50-75 bucks or owes. I would say he mostly dont get nothing every year. I get $800-1000 every year Now that we bought own this home and he makes more money than I do, Who will better benefits to claim it? (Mind this, it really doesn't matter who gets the money as we both share this returns) I just want to know the better benefits? We both files single as we are not married yet.