When a client qualifies for the Earned Income Credit based on Schedule C earned income, their tax preparer must: 1. Attach documentation of your income and expenses to the statement. 2. Prepare the return in a way that is disadvantageous to the customer. 3. Tell the client that the return will most likely be audited by the IRS. 4. Document the questions asked and the client's responses to the questions asked related to the income that is advantageous to the EIC