Get your taxes done using TurboTax

@CP01 She can change her W-4 to have more tax withheld -- she could even have a flat "extra" amount withheld from each paycheck if she wants to.

 

https://turbotax.intuit.com/tax-tools/calculators/w4/ https://www.irs.gov/individuals/tax-withholding-estimator

https://www.irs.gov/pub/irs-pdf/fw4.pdf

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