Internal Revenue Service

https://www.irs.gov/

New York State Department of Taxation

https://www.tax.ny.gov/

New York City Department of Taxation

https://www1.nyc.gov/site/finance/taxes/taxes.page

New Jersey State Department of Taxation

http://www.state.nj.us/treasury/taxation/

Form W-9

https://www.irs.gov/pub/irs-pdf/fw9.pdf

Form W-4

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

1040-ES

https://www.irs.gov/pub/irs-pdf/f1040es.pdf

Form 8822 (Change of Business Address)

https://www.irs.gov/pub/irs-pdf/f8822.pdf