Final answer:
The maximum investment income to qualify for the Earned Income Credit for the tax year 2021 is $3,650. It is important to check the most recent figures for the specific tax year in question.
Step-by-step explanation:
The maximum amount of investment income that Lewis and Oneida can have to qualify for the Earned Income Credit (EIC) depends on the tax year in question. However, the information given in the question does not provide the details required to answer this specifically for Lewis and Oneida, including the tax year they are filing for. Since this is likely a general question about the limits for qualifying for the EIC, we can give a general guideline. For the tax year 2021, the investment income limit is $3,650. Please note that the amounts change from year to year, and taxpayers should consult the most recent figures when preparing their taxes or when planning for the next year.