To adjust withholding on a full time job and a seasonal job W-2s, you need to treat the two jobs as a combined income source, even if one is temporary. if you don't adjust W-4 for your seasonal job, the IRS may underestimate your total income causing you to owe taxes and maybe penalties and interest for underpayment at the end of the year.
For the Full time job W-4:
1- use the IRS Tax Estimator
2 you need your most recent pay stubs from both jobs
3 info on any deductions like mortgage interest
4 check the box for multiple jobs
5 use multiple jobs worksheet to calculate an extra withholding amount
6- enter additional withholding amount suggested by the IRS estimator from the worksheet.
For the seasonal job:
1- Fill out the basic info such name SSN, Dependent etc..
2- in step 2 leave the box unchecked
3 don't claim dependents if you did on the first
4- add extra withholding, especially if this job has high pay in a short window
5- if your seasonal job doesn't withhold enough taxes, then you can add a flat amount to step 4 $100-$200 per paycheck depending on your total earning .
Please let me know if you would like further clarification.
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