How to use the payroll deduction per paycheck calculator
- Enter the amount and say whether it is a yearly total or a monthly amount.
- Choose your pay schedule and enter the first pay date of the year.
- Choose whether the deduction comes from every paycheck or only the first two each month.
- Read the amount per paycheck, the number of deductions and the table by month.
Formula
Yearly total = amount, or monthly amount x 12
Deductions = number of pay dates in the year that take the deduction
Per paycheck = yearly total / deductions, in whole cents
The leftover cents go one each to the first deductions so the total is exact
Pay dates: weekly or every two weeks counts 7 or 14 days from the first pay date; twice a month is the 15th and the last day; monthly is the last day.
A yearly amount and a monthly premium
A yearly deduction of $3,000.00 on an every-two-weeks schedule starting 2 January 2026 has 26 pay dates ending 18 December. $3,000.00 / 26 = $115.38 with 12 cents left over, so the first 12 paychecks take $115.39. January and July have three pay dates each.
A monthly premium of $320.00 comes to $3,840.00 a year. Taken only from the first two paychecks of each month, it falls on 24 of the 26 pay dates at $160.00 each, so the third paychecks in January and July are free of it. Weekly pay from 2 January 2026 has 52 pay dates and five in January, May, July and October.
Why the calendar matters
A yearly amount spread over pay dates depends on how many pay dates the year has. An every-two-weeks schedule has 26 pay dates in most years but 27 in a few, and the extra dates fall in the months with three. A monthly amount taken from two paychecks a month is paid over 24 pay dates, not 26, so each deduction is half the monthly amount, not the yearly amount divided by 26.
The first-pay-date field fixes the calendar. For weekly and every-two-weeks schedules it must be the first pay date that falls in the year, because later dates are counted from it. Semi-monthly and monthly schedules use the same dates every year, so only the year of the date matters.
Cents and what is not included
Amounts are paid in whole cents. When the yearly total does not divide evenly, the leftover cents are added one at a time to the first deductions so that the year's total is exact. The difference between paychecks is one cent.
The page does not calculate taxes, decide whether a deduction is before or after tax, or check any limit on how much may be withheld. For percent-based deductions see the net pay after deduction percent calculator; to see the months with an extra pay date use the extra paycheck months finder; and to compare schedules, the semi-monthly vs biweekly pay calculator. The paycheck split calculator divides a single paycheck among accounts.
Assumptions and limits
- The pay dates follow the schedule described, with no holiday or weekend adjustments.
- Semi-monthly pay is on the 15th and last day, and monthly pay on the last day of the month. Your employer's dates may differ.
- The yearly total is divided evenly across the deductions that fall in the calendar year of the first pay date.
- Taxes and limits are not modeled; the amounts are exactly what you enter.
Frequently asked questions
Why are there sometimes three paychecks in a month?
An every-two-weeks schedule pays every 14 days, which is 26 times in a year, but months have 28 to 31 days. Twice a year, a month starts early enough to hold three pay dates. Weekly pay has four months with five pay dates in most years.
What if my deduction is only taken from the first two paychecks of a month?
Choose "First two each month". The page then counts only those pay dates, so the deduction is spread over about 24 paychecks and the amount per paycheck is larger than if it were taken from every paycheck.
Why do some paychecks take one cent more?
A yearly total in cents rarely divides evenly by the number of paychecks. Giving the extra cents to the first few paychecks keeps the yearly total exact without a fraction of a cent.
Does the page know which date my employer pays on?
No. It uses the schedule and first pay date you enter. If your employer shifts pay dates for weekends or holidays, the counts per month can differ from what the page shows.