My new husband and I are both seniors. We each own a home. Can we both deduct the real estate taxes on both homes on a joint return?

Yes. There is no limit on the number of personal-use properties for which you can fully deduct real estate taxes. There is no need to file separate returns, but if you choose to do so, then each can deduct his or her real estate taxes on the separate return for each spouse. If there is any mortgage interest, you can deduct it on a principal residence and one designated other personal-use residence (within the limits allowed for deducting mortgage interest).