How can you calculate the deductions on a paycheck ?

Answer 1

Go to the following website, www.paycheckcity.com. It can do that. But just to let you know, social security is 6.2% of your paycheck, and medicare is 1.45% of your paycheck.

Answer 2

Your federal tax withholding is based on how you fill out your W-4. You can go to www.irs.gov and find the tables that will show exactly how much will be held out according to how often you are paid and how much.
The you will pay social security at a rate of .062 on your gross wages up to a certain point and .0145 for medicare.
Those are your standard deductions and anything else you will need to find out from your employer.
Your employer pays an equal amount of social security and medicare as well as state and federal unemployement insurance. The state rate is based on previous claims and the federal rate depends on whether you have paid promptly in the past.
All deductions stop when you reach certain levels of wages.

Answer 3

Federal tax withholding calculations
Federal income tax withholdings were calculated by:

Multiplying taxable gross wages by the number of pay periods per year to compute your annual wage.
Subtracting the value of allowances allowed (for 2007, this is $3,400 multiplied by withholding allowances claimed).
Determining your annual tax by using the tables below (single and married rates, respectively).
Dividing the amount of tax by the number of pay periods per year to arrive at the amount of federal withholding tax to be deducted per pay period.

Medicare is calculated as the gross earnings times 1.45%.

Social Sercurity is calculated as your gross earnings times 6.2%