The tax liability on a Form 941 return includes your employees' withheld federal income tax, social security tax, Medicare tax, and your share of social security and Medicare tax. If necessary, the IRS will assist you in completing blank coupons, which can be used to make a deposit if you do not have pre-printed Forms 8109. To avoid a penalty, it is important that deposits be made timely. If the deposit due date falls on a Saturday, Sunday, or legal holiday, the deposit will be due the next banking day. You must deposit the Form 941 taxes based on either a monthly or semi-weekly deposit schedule.
New employers are generally monthly depositors for at least the first year.
This is called the lookback period. For example, taxes for January must be deposited by February 15th. Failure to make required deposits electronically will result in a Failure Deposit Penalty. Employer's Tax Guide for deposit requirements.