The West Virginia senator insisted that if the program is to continue into 2022, it must have a firm work requirement to try and deter recipients from using it as their sole means of income.
Manchin also wants the program only to be made available to families with an income of $60,000 or below, a huge reduction on the current earnings cap.
Such demands by Manchin would cripple one of President Biden's signature programs designed to help working families, but they will also cut the package's overall costs.
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Previously, Manchin claimed that he would not support any spending package higher than $1.5 trillion.
His demands, reported by Axios, are also set to infuriate the more progressive wing of the Democrat party.
West Virginia has leaned Republican since the 2000 presidential election, and supported GOP candidates in every run-off since then. Manchin is no doubt mindful of supporting any policy that could be construed as an example of profligate socialism by his state's burgeoning conservative population.
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President Biden's American Families Plan, part of his sweeping Build Back Better agenda, raised yearly child tax benefit to $3,000 per child aged 6 to 17, and $3,600 for children under the age of 6.
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Families eligible for the newly-boosted child tax credits began receiving the checks starting July 15, with the program set to run for the remainder of the 2021 tax year.
Ahead of that boost, the maximum annual child tax credit is $2,000, doubled from $1,000 by Donald Trump's Tax Cuts and Jobs Act.
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Under the Biden plan that went into effect in July, two parent families on a combined salary of up to $150,000 are eligible for the tax credit. Families with a single 'head of household' being paid up to $112,500 a year are also included. A head of household is an unmarried person who covers more than half their family's living costs, and lives with them for more than half of the year.
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Single parents on salaries of up to $75,000 also currently receive the credit.
Parents are receiving half the credit they are eligible for in 2021, and will be able to claim the rest back when completing this year's federal tax return.
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The Democrats' proposal does away with the minimum income requirement. A parent with two children younger than 6 and no reported annual income would be eligible to receive $7,200 from the federal government per year under Biden's plan.
Federal investments in US families have been a significant talking point for Democrats and Biden officials promoting the bill.
Biden's child tax credit boost resembles his temporary increases under the American Rescue Plan, which was passed to help the US through the COVID-19 pandemic.
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