Understanding Payroll Deductions
Payroll deductions come in two kinds: mandatory ones set by law, and voluntary ones your employees choose. The mandatory side is not negotiable; the voluntary side is where most errors, and most complaints, happen.
The two kinds
Mandatory deductions are federal income tax withholding, FICA taxes, state and sometimes local income tax, and court-ordered items such as garnishments and child support. Voluntary deductions are everything the employee elects: health premiums, retirement contributions, life insurance, union dues.
| Type | Examples | Employee consent needed? |
|---|---|---|
| Statutory | Federal and state income tax, FICA | No |
| Court ordered | Garnishments, child support | No |
| Voluntary | Health premiums, 401(k), life cover | Yes, documented at enrollment |
Where it goes wrong
Pre-tax versus post-tax confusion. Health premiums are usually pre-tax; retirement contributions may be either. Getting the treatment wrong changes taxable wages and the W-2.
Garnishment priority. Federal law sets a ceiling on disposable earnings, and states layer their own rules. When two orders arrive, priority is not obvious and getting it wrong creates liability to the creditor.
Recouping overpayments. Clawing back an overpayment from a final cheque is restricted in several states; some require written consent.
The check worth running
Once a year, sample one payslip per deduction type and trace it to authorization and remittance. A PEO runs this machinery daily; see PEO versus payroll service if you would rather hand it off.
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Frequently asked
Are health insurance deductions pre-tax?
Usually yes under a Section 125 cafeteria plan, which lowers taxable wages. Roth contributions are the common exception, taken post-tax.
Can an employer deduct for damaged equipment?
Rarely without written authorization, and some states prohibit it outright when it cuts below minimum wage for the workweek.
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