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If you plan to file jointly for 2010, the estimated payments will be applied to your joint tax liability, even if your husband does not share in your home business. The nature of a joint return is the tax liability is also joint, even if only one spouse has income. Therefore, you should follow the instructions on the 1040V-- SS# XXXXX first on the return in box one, and the second SS# XXXXX box two. Fill out your names in box 4 the same as they are usually shown on your joint return.
Don't use your business name and EIN#, since as you are an LLC, you will be filing a Schedule C as a sole proprietor, and your business related income is added to your joint income---which is reported under SSNs. You would only use your business EIN if you were filing est. payments for a corporate return.
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