I recommend using the W-4 Calculator to help you determine how much you should withhold from your 2nd job. The calculator will ask you specific questions as it relates to your personal situation, prior year tax returns, and your expected pay to help you calculate the withholding amount. Make sure you mark that this is for a second job to ensure the most accurate withholding amount is calculated. You can do this in step 2 of the W-4 Form.
When you complete the calculator, you will be able to print out the W-4 form based upon your entries and provide that to each employer to ensure you have enough withheld from each paycheck going forward.
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