Why am I being paid differently?

[WildflowerChild]

I work a normal office job, 9-5 with a set yearly wage but I’m paid differently each month

Sometimes it can be the difference of £100. Is that normal?

Sorry I know I sound stupid

Could it be number of weeks in each month?

No it's not normal, ask your payroll team for an explanation.

We get paid the 22nd of each month so potentially I’ve just worked more days?

How long has this been happening? Are you getting paid a different gross wage or net?

Is it a new job? It could be a change in tax code, or pension deductions from Auto Enrolment. The only way to know is to check your wage slip.

don't you get a payslip? is the gross changing or the net after tax. ie what number is changing each month.

Do you know the cut off date for wages? For example, if it's a week before then the pay period is 16th of one month to the 15th of pay month.

In December pay that was 20 working days (assuming Monday - Friday)
In February pay that was 22 working days

Or you could email HR and just ask.
In March pay that was 20 working days

May I suggest that asking your employer is likely to get the actual answer, all anyone here can do is guess

The normal way is to pay you 1/12 of your annual salary each month, with appropriate deductions for tax, NI, pension and student loan if relevant on a set date or last working day before that date and no messing about for number of days or weeks worked.

My salary is the same within a few pence each month, but obviously different employers may do it differently.

What does your payslip tell you?