Where to find my w4

A W-4 is the Employee's Withholding Certificate that you give to your employer so that your employer can withhold the correct federal income tax from your pay.

IRS Form W-4 - https://www.irs.gov/pub/irs-pdf/fw4.pdf

IRS website for the tax withholding estimator - https://www.irs.gov/individuals/tax-withholding-estimator

However, if you were referring to the Form W-2 that you receive from your employer which shows your total income received, federal tax withheld plus Social Security and Medicate taxes withheld then that form will be provided by the employer no later than January 31, 2021 for tax year 2020.

A W-4 is the form you give to your employer to tell the employer how much tax to withhold from your paychecks.  It only goes to the employer--it does not go to the IRS.  If you need to change the amount of tax you are having withheld then you ask the employer to let you fill out a different W-4.

Does that help---or are you really asking about something else?