You started on the 8th and the first check is not half a month’s salary. That is usually correct, and the reason is that there are two lawful ways to count the days you were there. They do not agree, nobody tells you which one your employer uses, and the difference can be over a hundred dollars on a single check.
How the number is built
Two steps, and only the second one is interesting.
First, a full period. Your salary divided by the number of pay periods in the year. On $65,000 paid twice a month that is $65,000 ÷ 24, or $2,708.33. Paid every two weeks it would be $65,000 ÷ 26, or $2,500, and the two are not the same number by design. Twice a month is twelve months of two checks; every two weeks is 26 checks, which is why two months each year hold three paydays.
Second, the share of that period you were actually on payroll. This is where it gets contentious.
The two ways payroll counts the days
Take September 2026, where the 1st falls on a Tuesday, and someone starting on the 8th in a period running the 1st to the 15th.
- Counting working days, the period holds 11 of them and they were there for 6. That is $2,708.33 × 6/11, or $1,477.27.
- Counting calendar days, the period holds 15 and they were there for 8. That is $2,708.33 × 8/15, or $1,444.44.
- Same salary, same start date, $32.83 apart.
Thirty-three dollars is not worth an argument. The gap is not always thirty-three dollars.
| Situation | Working days | Calendar days | Apart by |
|---|---|---|---|
| Start Sept 8, paid twice a month | $1,477.27 | $1,444.44 | $32.83 |
| Start Sept 21, paid twice a month | $1,969.70 | $1,805.56 | $164.14 |
| Start Sept 16, paid monthly | $2,708.33 | $2,708.33 | nothing |
| Start Wednesday of a weekly period | $750.00 | $892.86 | $142.86 |
Read the last two rows together. In the monthly case the two methods land on exactly the same figure, by coincidence of that month’s weekends. In the weekly case the calendar method pays more, which is the opposite of the row above it.
So there is no method that is quietly better for you. It turns on how weekday-heavy your slice is next to the period as a whole. A stretch ending on a Friday is dense with working days and the working-day count flatters it. A stretch ending on a Sunday carries two days the working-day count ignores entirely, and there the calendar method pays more: start on the Wednesday of a Monday-to-Sunday week and you are credited with 3 of the period’s 5 working days, but 5 of its 7 calendar days. This is worth knowing mainly so you can stop suspecting you were shortchanged. If the figure on your stub matches either column above, payroll did it properly.
Working out which one your employer used
You rarely find it written down. The offer letter gives an annual figure and the handbook covers leave, and neither mentions how a part-period is divided. The quickest route is to work backwards from the stub.
Put your dates into the calculator above. It shows both figures side by side whichever one you pick for the headline, so compare your gross to the pair. Matching one of them settles it, and the answer holds for your last check too. If it matches neither, it is worth asking payroll, because a third possibility is that they converted your salary to an hourly rate and paid you for hours instead, which is a different calculation again and more common for part-time and shift-based salaried roles.
Public holidays are left in on purpose
The calculator counts Monday to Friday and does not subtract public holidays. That is deliberate. Salaried employees are normally paid for holidays, so treating one as a non-working day would shrink the denominator and the numerator both, and would understate a check that in practice includes the day.
If your employer runs an unpaid-holiday policy, which is unusual on a salary, take those days off the count yourself.
The last check works the same way, plus whatever else lands
Leaving on the 20th is the same arithmetic from the other end: the share of the period up to and including your last day on payroll. Set your last day above and leave the first day at the start of the period.
What makes a final check confusing is that several different things usually arrive on it at once, and they are not withheld the same way.
- The prorated salary is ordinary wages, withheld exactly like any other paycheck.
- A PTO payout is supplemental pay and is withheld like a bonus. Whether you get one at all depends on your state and your handbook, which how much of a PTO payout you keep works through, along with what the balance is worth once withholding is taken off.
- Severance is supplemental too, and stacked on the same check it can push the whole thing to a withholding rate that looks alarming. Why a bonus gets taxed at 40% explains that one, and it is withholding rather than tax.
What to enter
- Your annual salary is the gross figure from the offer letter. This page works in gross; for what lands after withholding, the take-home pay calculator does it by state.
- How often you are paid sets the length of the period. Twice a month and monthly are pinned to the calendar, so any date inside the period works and the rest is filled in. Weekly and every two weeks are cycles, so the date needs to be the real first day of the period.
- First day of the pay period comes off your pay stub. If you are paid twice a month, it is the 1st or the 16th.
- Your first day and last day are the days you were on payroll. A date outside the period is treated as the edge of it, so a start date last month simply means you are paid for all of this one.
Prorated salary FAQ
Divide the annual salary by the number of pay periods in the year, then multiply by the share of the period you were on payroll. On $65,000 paid twice a month a full period is $2,708.33, and somebody there for 6 of the period's 11 working days gets $1,477.27.
Both are used and neither is wrong. Counting working days, Monday to Friday, is the more common convention for salaried staff. Counting calendar days is simpler and some employers use it. On the same salary and the same dates the two can be more than $150 apart on one check.
Usually yes. Most salaried employers pay public holidays, which is why this calculator counts them as working days rather than subtracting them. If your employer runs an unpaid-holiday policy, take those days off the count yourself.
The same way, from the other end: the share of the period up to and including your last day on payroll. Unused PTO may be added on top as a separate line, depending on your state and your employer's policy, and it is withheld differently from the salary part.
Usually one of three things, and often all three. The period was prorated because you started part way through it. Your employer pays in arrears, so the first check covers a shorter stretch than you think. And benefit deductions sometimes double up in the first month to catch up on a mid-month enrolment.