There is no lead individual on a tax return. Someone's name has to be first, but that doesn't mean anything beyond that. On a joint return, you each can have your own businesses, W2s, contributions, penalties, etc.
A business on a 1040 return must be either yours. In the initial screens, it asks which taxpayer had the business. The business isn't assumed to he his, and it couldn't be reported as both of yours.
Also, expenses to become something are not deductible as business expenses. For instance, you cannot deduct schooling to become a CPA or a realtor as a business expense. If you went to an eligible college or university, you can consider these education expenses, however.
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