The IRS encourages everyone to use the Tax Withholding Estimator to perform a
quick “paycheck checkup.” The Estimator helps you identify your tax withholding
to make sure you have the right amount of tax withheld from your paycheck at work.

Where to file addresses for taxpayers: Federal.  

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Where to file addresses for taxpayers: New York State.

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Links to all 50 state's tax form websites.  * not all links are updated.