To enter memberships:
Go to the Business tab.
Click Continue.
Select I'll choose what I work on.
Click Start or Update by Business Income and Expenses.
Click Edit by the business name.
Click Start or Update by Other Common Business Expenses.
Click Start by Other Miscellaneous Expenses.
Type in "Membership", and the amount.
It'll show up on your Schedule C as a Miscellaneous Expense on page 2.
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