 Required net paycheck
 This is the net paycheck you would like to have after any paycheck deductions.
 Pay period
 This is how often you are paid. Your selections are: Weekly (52 paychecks per year), Every other week (26 paychecks per year), Twice a month (24 paychecks per year), Monthly (12 paychecks per year), and Annually (one paycheck per year).
 Number of allowances
 When your Federal income tax withholdings are calculated, you are allowed to claim allowances to reduce the amount of the Federal income tax withholding. In 2010, each allowance you claim is equal to $3,650 of income that you expect to have in deductions when you file your annual tax return. The number of allowances you should claim depends largely on the number of dependents you have and your itemized deductions. This calculator allows from 0 to 99 allowances.
 401(k)/403(b) plan withholding
 This is the percent of your gross income you put into a taxable deferred retirement account such as a 401(k) or 403(b). While increasing your retirement account savings does lower your take home pay, it also lowers your Federal income tax withholdings. The impact on your paycheck might be less than you think. While your plan may not have a deferral percentage limit, this calculator limits deferrals to 80% to account for FICA (Social Security and Medicare) taxes. Please note that your 401(k) or 403(b) plan contributions may be limited to less than 80% of your income. Check with your plan administrator for details. For 2010 there has been no change to the maximum contribution to a 401(k) or 403(b) which is $16,500 per year for individuals under 50 and $22,000 for individuals 50 or older.
 State and Local Taxes
 This is the percentage that will be deducted for state and local taxes. We take your gross pay, minus $3,650 per allowance, times this percentage to calculate your estimated state and local taxes. Please note, this calculator can only estimate your state and local withholdings.
 Posttax deductions
 Enter any payroll deductions made by your employer that are made with after tax income.
 Posttax reimbursements
 Enter any reimbursements made by your employer that are after tax.
 FICA OASDI
 FICA Old Age Survivors and Disability Insurance. FICA OASDI is calculated as your gross earnings times 6.2%. Please note that this calculator does not make any assumptions as to the total FICA OASDI paid for the current year. For 2010, incomes over $106,800 that have already had the maximum FICA OASDI amount of $6621.60 withheld will not have additional FICA OASDI withholdings.
 FICA Medicare
 FICA Medicare is calculated as the gross earnings times 1.45%. Unlike FICA OASDI there is no annual limit to FICA Medicare deductions.
 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 2010, this is $3,650 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.
Single Withholding Rates*
Annual taxable income between these amounts 
Annual withholding 
Withhold additional % of income over this amount 
$0.00 
$6,050.00 
$0.00 

$6,050.00 
$10,425.00 
$0.000 
plus 10% of income over $6,050.00 
$10,425.00 
$36,050.00 
$437.50 
plus 15% of income over $10,425.00 
$36,050.00 
$67,700.00 
$4,281.25 
plus 25% of income over $36,050.00 
$67,700.00 
$84,450.00 
$12,193.75 
plus 27% of income over $67,700.00 
$84,450.00 
$87,700.00 
$16,716.25 
plus 30% of income over $84,450.00 
$87,700.00 
$173,900.00 
$17,691.25 
plus 28% of income over $87,700.00 
$173,900.00 
$375,700.00 
$41,827.25 
plus 33% of income over $173,900.00 
$375,700.00 
(no limit) 
$108,421.25 
plus 35% of income over $375,700.00 

Married Withholding Rates*
Annual taxable income between these amounts 
Annual withholding 
Withhold additional % of income over this amount 
$0.00 
$13,750.00 
$0.00 

$13,750.00 
$24,500.00 
$0.00 
plus 10% of income over $13,750.00 
$24,500.00 
$75,750.00 
$1,075.00 
plus 15% of income over $24,500.00 
$75,750.00 
$94,050.00 
$8,762.50 
plus 25% of income over $75,750.00 
$94,050.00 
$124,050.00 
$13,337.50 
plus 27% of income over $94,050.00 
$124,050.00 
$145,050.00 
$21,437.50 
plus 25% of income over $124,050.00 
$145,050.00 
$217,000.00 
$26,687.50 
plus 28% of income over $145,050.00 
$217,000.00 
$381,400.00 
$46,883.50 
plus 33% of income over $217,000.00 
$381,400.00 
(no limit) 
101,085.50 
plus 35% of income over $381,400.00 

