Hello JA Customer,
In this day and age, most employers show every deduction that was taken from your paycheck on the check stub. This would include federal income taxes, state income taxes, FICA and Medicare taxes, health insurance deductions, 401k contributions, etc. But technically they are not required to show any of this information on the check stub.
Many employers use payroll companies such as ADP to process their payrolls or they have their own in-house payroll programs which automatically generate this information. But there are still a few smaller employers who manually calculate these deductions and simply write you a check for the net amount without showing a breakdown of the deductions.
If you find yourself in a situation where your employer does not provide all of this information on the check stub, you should ask them to give you a separate breakdown of what was deducted from your checks.
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Thank you JA Customer