If you are claiming 50/50 for income then you need to claim 50/50 for the expenses also.
For more information please see our TurboTax FAQs:
When Married Couples Run Businesses Together
Completing Your Return if You Co-Own a Small Business with Your Spouse
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Thanks @TurboTaxGinette! I understand that we need to split the expenses, but it seems that TurboTax automatically splits our 50/50 income, so I'm wondering if we need to divide our total expense costs by two and physically enter those amounts in each of our relevant sections OR if the system will work out that we are dividing the expense costs between us so entering the total amount in my section (which is then replicated in my partner's) is the way to go. Hope this is making sense and thanks for your help.