How can I fill out a W4 form to ensure maximum withholding from my paycheck?

To maximize withholding from your paycheck on a W4 form, you can choose to have additional money withheld by entering a specific dollar amount on line 4(c) or by selecting a lower number of allowances on line 5. This will result in more taxes being taken out of your paycheck, increasing your tax refund or reducing the amount you owe at tax time.