Federal law requires you, as an employer, to withhold taxes from your employees’ paychecks. Each time you pay wages, you must withhold – or take out of your employees’ paychecks – certain amounts for federal income tax, social security tax, and Medicare tax. Under the withholding system, taxes withheld from your employees are credited to your employees in payment of their tax liabilities.
Who Must File Form 941?

Use Form 941 to report the following amounts.

Do not use the Form 941 to report backup withholding or income tax withholding on nonpayroll payments such as pensions, annuities, and gambling winnings. Report these types of withholding on Form 945, Annual Return of Withheld Federal Income Tax. you must file a return for each quarter.

If you sell or transfer your business, you and the new owner must each file a Form 941 for the quarter in which the transfer occurred. Report only the wages you paid.

Download IRS Form 941 from here

Download IRS form 941 instructions from here