Voluntary deductions are the amounts taken from your paycheck because you signed up for something, such as a 401(k), a health plan or life insurance. Unlike taxes and court-ordered garnishments, you choose them, and you can usually change them at open enrollment or after a qualifying life event.
They matter because they often make up the biggest gap between your salary and your deposit after taxes. Knowing which ones come out before tax and which come out after tax helps you read your stub and predict how a benefit choice will change your net pay.
Voluntary vs. Mandatory Deductions
Every pay stub mixes two kinds of deductions. Mandatory deductions are required by law or a court: federal income tax withholding, Social Security, Medicare, state and local income taxes where they apply, and any garnishment. You can influence some of them (your W-4 affects federal withholding), but you can't opt out.
Voluntary deductions are the ones you elect. Your employer needs your authorization to take them, which is why you fill out enrollment forms or click through a benefits portal. If you ever see a deduction you don't recognize, it should trace back to something you signed up for.
| Type | Examples | Can you stop it? |
|---|---|---|
| Mandatory | Federal income tax, Social Security, Medicare, state income tax, garnishments | No |
| Voluntary, pre-tax | Traditional 401(k), health, dental and vision premiums, HSA, FSA, commuter benefits | Yes, within plan rules |
| Voluntary, after-tax | Roth 401(k), supplemental life insurance, some disability coverage, union dues, charitable giving | Yes, within plan rules |
The Most Common Voluntary Deductions
Retirement contributions
A traditional 401(k), 403(b) or 457 contribution comes out before federal income tax, which lowers the income tax withheld from each check. It does not lower Social Security or Medicare. For 2026 you can defer up to $24,500, plus an $8,000 catch-up at age 50 or older, or $11,250 if you are 60 to 63. Roth 401(k) contributions count toward the same limit but come out after tax. Our guide to how a 401(k) affects take-home pay walks through the math.
Health, dental and vision premiums
Your share of employer health coverage is usually taken pre-tax through a cafeteria plan, which means it is skipped for federal income tax and for Social Security and Medicare. Dental and vision premiums are usually handled the same way.
HSA and FSA contributions
Health savings account contributions made through payroll are pre-tax. In 2026 the HSA limit is $4,400 for self-only coverage and $8,750 for family coverage, and you need a qualifying high-deductible health plan. Flexible spending accounts are also pre-tax but follow different rules; FSA vs. HSA compares them.
Insurance and other extras
Supplemental life insurance, accident and critical illness plans, legal plans and pet insurance usually come out after tax. Disability insurance can go either way depending on how your employer sets it up. Charitable payroll giving, union dues and employee stock purchase plans are also common after-tax items.
How Voluntary Deductions Change Your Net Pay
The key detail is timing. A pre-tax deduction is subtracted before taxes are figured, so each dollar costs you less than a dollar in take-home pay. An after-tax deduction comes out of money that has already been taxed, so each dollar reduces your deposit by a full dollar.
Here is an estimate for a single filer in Georgia earning $52,000 a year, paid biweekly (26 paychecks). The second column adds three voluntary deductions: a 6% traditional 401(k) contribution ($120), an $85 health premium taken pre-tax, and a $25 after-tax deduction for supplemental life insurance.
| Per paycheck | No voluntary deductions | With deductions |
|---|---|---|
| Gross pay | $2,000.00 | $2,000.00 |
| 401(k) (pre-tax) | $0.00 | $120.00 |
| Health premium (pre-tax) | $0.00 | $85.00 |
| Federal income tax | $156.15 | $131.55 |
| Social Security | $124.00 | $118.73 |
| Medicare | $29.00 | $27.77 |
| Georgia income tax | $79.85 | $69.21 |
| Life insurance (after-tax) | $0.00 | $25.00 |
| Net pay | $1,611.00 | $1,422.74 |
The three deductions total $230 per paycheck, but net pay drops by only $188.26. That's because total taxes fall by $41.74 per check, about $1,085 over the year. Notice that the 401(k) lowered federal and Georgia income tax but not Social Security or Medicare, while the health premium lowered all of them. The $25 life insurance premium saved nothing in tax.
The same deductions would save less tax in a state with no wage income tax, such as Florida, because there's no state withholding to reduce. You can compare with the Georgia paycheck calculator.
You can test your own mix of deductions in the paycheck calculator, which has fields for 401(k) percentage, health premiums, HSA contributions and after-tax deductions. Results are estimates; your employer's payroll system may round differently.
Reading Voluntary Deductions on Your Stub
Payroll providers label deductions in short codes, and they don't all use the same ones. You may see "401K" or "RTH401K," "MED PRE," "DEN," "VIS," "HSA EE," "SUPP LIFE," "STD" or "LTD" for short- and long-term disability, and "DUES." Your HR or payroll team can give you a code list if something isn't clear.
Most stubs list deductions in two places: a current-period amount and a year-to-date total. The YTD column is handy for checking that your 401(k) or HSA is on pace with your plan, and for spotting a deduction that started or stopped unexpectedly. Our guide on how to read your pay stub covers the rest of the layout.
Some stubs also show employer-paid amounts, such as the employer share of health premiums or a 401(k) match. These are informational. They aren't taken out of your pay.
Changing or Stopping a Voluntary Deduction
Retirement contributions are usually the easiest to change. Many plans let you adjust your 401(k) percentage at any time, with the change showing up in a paycheck or two.
Health, dental, vision and FSA elections made through a cafeteria plan are generally locked for the plan year. You can change them at open enrollment or within a limited window after a qualifying event such as marriage, a new child or losing other coverage. HSA contributions, on the other hand, can generally be changed during the year. The Section 125 cafeteria plan article explains why the rules differ.
For after-tax items like supplemental insurance or charitable giving, check the plan or program rules. When you stop a deduction, look at the next one or two stubs to confirm it's gone.
Frequently Asked Questions
Are voluntary deductions taken before or after taxes?
It depends on the deduction. Traditional retirement contributions, cafeteria-plan health premiums, HSA and FSA contributions are generally pre-tax, while Roth contributions, most supplemental insurance and charitable giving are after-tax.
Can my employer add a voluntary deduction without my permission?
A voluntary deduction requires your authorization, which is what makes it voluntary. If a deduction appears that you didn't sign up for, ask payroll for the enrollment record and check your state labor department's rules on wage deductions.
Do pre-tax deductions lower Social Security and Medicare?
Cafeteria-plan items like health premiums and HSA contributions usually do. Traditional 401(k) contributions do not; they still count as wages for Social Security and Medicare.
Does stopping a voluntary deduction raise my paycheck by the same amount?
Only for after-tax deductions. Stopping a pre-tax deduction raises your taxable wages too, so your net pay rises by less than the deduction amount.
Sources
- IRS Publication 15 (Circular E), Employer's Tax Guide
- IRS: 401(k) limit increases to $24,500 for 2026
- IRS Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans
Run the numbers for your state
Written and checked against IRS, Social Security Administration and state tax agency publications for the 2026 tax year. General information, not tax, legal or financial advice. Read our editorial policy, calculation methodology and sources.