The withholding agent shall, within five days, turn over the tax amount withheld each time to the state Treasury, and submit a report on the income tax withheld to the local tax authority.

扣缴义务人每次所扣的税款，应当于五日内缴入国库，并向当地税务机关报送扣缴所得税报告表。

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They set the price high and they withheld a certain amount of propane from the market, allegedly.

NPR: Marketplace Report: BP Sued for Propane Profiteering

You may also have to pay estimated tax if the amount of income tax being withheld from your salary, pension, or other income is not enough.

FORBES: Taxes From A To Z (2013): A Is For Annualized Income Installment Method