Since there are many potential sources of income that may affect tax withholdings, it's best to use a W-4 calculator, like this one: https://turbotax.intuit.com/tax-tools/calculators/w4/
To best use the calculator, you will want to have paycheck stubs from all employers plus information regarding any other sources of income (interest, investments, etc.). Your prior year return can also be useful in identifying other sources of income that may need to be considered when calculating appropriate withholdings.
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