The "Multiple jobs or spouse works" section of the W4 is for taxpayers who work multiple jobs or are married filing jointly and both are employed. To be accurate, both spouses should fill out a W4 for each job - even that summer one you are starting soon.
The form lists three ways you can complete this section:
- The most accurate option is using an online estimator like TurboTax’s W-4 withholding calculator.
- You can also use a worksheet to calculate this information.
- Or, you can check the box for step 2(c) for both jobs if there are only two jobs total and the earnings are fairly similar.
Yes, your "income bracket" does determine how much is taken out of your pay for withholding. To be accurate, you would need to all income on your W4 - which would include your summer job and your spouse's income.
If you make a change in the middle of the year, it's wise to fill out a new form at the beginning of the next year. The adjustments made may result in incorrect results if enacted for a full tax year rather than just part of a year. For a more detailed explanation see this link: Form W4 and Take-Home Pay
Yes, it would be very smart to check the IRS calculator quarterly to make sure you are withholding enough. You can always make additional payments directly to the IRS if your current withholding amounts are not enough based on your spouse's variable income plan. Make a Payment.
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