The mechanics
How does payroll withholding work for part-year employees?
Federal withholding tables in IRS Publication 15-T are designed for employees who work all year. The system takes your pay for a single period (weekly, biweekly, or semi-monthly), annualizes it, applies the federal tax brackets to the annual figure, and divides the annual tax by the number of pay periods to determine withholding per paycheck.
This method is accurate when your pay is consistent across all pay periods. For seasonal workers, it systematically over-withholds because:
- Each paycheck is treated as if you earn that amount every period all year
- The projected annual income pushes you into a higher bracket than your actual income warrants
- The standard deduction is spread across all 52 (or 26, or 24) pay periods, so the per-period deduction is small — but if you only work 10 periods, you are only getting 10/52 of the deduction applied to withholding
How can you reduce over-withholding on a seasonal job?
You have several options to keep more money in your paycheck instead of waiting for a refund:
Option 1: Use the IRS Withholding Estimator
The IRS Tax Withholding Estimator (irs.gov) accounts for part-year work. Enter your expected total annual income from all jobs and it will calculate the right W-4 settings. Submit the revised W-4 to your seasonal employer.
Option 2: Claim exempt on W-4 (if eligible)
If you had no federal income tax liability last year and expect none this year, you can write “Exempt” on Form W-4 line 4(c) and your employer will withhold zero federal income tax. This is common for students whose only income is a short summer job below the standard deduction. Be careful: if you end up owing tax, you may face an underpayment penalty.
Option 3: Adjust W-4 Step 4(b)
If you cannot claim exempt but want to reduce withholding, enter an additional deduction amount on W-4 Step 4(b). For example, if you expect to work only 3 months at $4,000/month ($12,000 total), and the standard deduction covers most of that, an extra deduction amount can reduce withholding significantly. The IRS Withholding Estimator calculates the right number.
What if you have both a seasonal job and a regular job?
If you work a full-time job year-round and take a seasonal job on the side, the seasonal employer withholds as if that job were your only income. Combined with your regular job’s withholding, you may end up either over-withheld (common for lower earners) or under-withheld (if the combined income pushes you into a higher bracket and neither employer accounts for the other).
To handle this, use the IRS Withholding Estimator with both jobs entered. The estimator will tell you how to adjust the W-4 at one or both employers. You can also use the second job tax calculator to see the marginal impact. Alternatively, requesting a flat dollar amount of extra withholding on W-4 Step 4(c) at your seasonal job can prevent a year-end surprise.
Worked example: college student summer internship
A college student earns $18/hour for 40 hours/week during a 12-week summer internship. No other income for the year.
| Item | Amount |
|---|---|
| Weekly gross | $720 |
| Total gross (12 weeks) | $8,640 |
| Payroll projected annual | $37,440 (=$720 × 52) |
| Federal withholding (annualized method) | ~$50/week × 12 = $600 |
| FICA withheld (7.65%) | $661 |
| Actual federal tax owed (below standard deduction) | $0 |
| Refund at filing | $600 |
If the student had claimed exempt on the W-4 (eligible because they had no tax liability the prior year and expect none this year), the $600 would have stayed in their paycheck. The FICA $661 is not refundable.
Illustrative example using approximate 2026 rates. Use the tax refund estimator for your situation.
Do seasonal workers need to file a tax return?
Filing is generally required if your gross income exceeds the standard deduction for your filing status. Even if it does not, you should file if any federal income tax was withheld — that is the only way to get the over-withholding refunded. Filing is free through IRS Free File for eligible taxpayers (income below the threshold) or through Form 1040-EZ equivalent procedures.
Important: many states also over-withhold on seasonal work using similar annualized methods. Filing your state return recovers that over-withholding too. Check your part-time vs full-time calculator and state take-home calculator for estimates.
Questions
Seasonal job tax FAQ
Why is so much tax withheld from my seasonal job?
Payroll systems annualize each paycheck. If you earn $1,000 per week, the system projects $52,000 per year and withholds at the brackets for that income, even if you only work 12 weeks and will actually earn $12,000 total. At $12,000, you may owe little or no federal income tax, so most of the withholding comes back as a refund.
Do seasonal workers get a tax refund?
Very often, yes. Because withholding is calculated as if you work all year, part-year workers typically have more tax withheld than they actually owe. Filing a tax return is the only way to get the over-withholding back. Even if you are not required to file, you should file to claim your refund.
How can I reduce over-withholding on a seasonal job?
You can use the IRS Tax Withholding Estimator at irs.gov to calculate adjusted withholding, then submit a revised W-4 to your employer. Claiming additional deductions or using the extra deductions line on W-4 Step 4(b) can reduce each paycheck's withholding to better match your actual annual liability.
Do I owe FICA on seasonal work?
Yes. There is no exemption from Social Security (6.2%) or Medicare (1.45%) taxes for seasonal work. FICA is calculated on each dollar of wages regardless of how many weeks you work. Unlike income tax, FICA withholding is accurate per paycheck and generally does not result in over-withholding.
What if my seasonal job is my only income for the year?
If your total annual income from all sources falls below the standard deduction (check the current year's amount at irs.gov), you may owe zero federal income tax. In that case, every dollar of federal income tax withheld from your seasonal paychecks will be refunded when you file. FICA taxes, however, are not refundable through your tax return.
- Sources: IRS Publication 15-T (Withholding Tables, 2026) · IRS Form W-4 instructions · IRS Tax Withholding Estimator.
- 🔄 Last updated July 31, 2026 · Tax year 2026
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