W-9 Form:

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

1040 Form: 

https://www.irs.gov/pub/irs-pdf/f1040.pdf

W-4 Form:

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

1040-ES Form: 

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

4506-T Form: 

https://www.irs.gov/pub/irs-pdf/f4506t.pdf

941 Form: 

https://www.irs.gov/pub/irs-pdf/f941.pdf

W-2 Form: 

https://www.irs.gov/pub/irs-pdf/fw2.pdf

9465 Form: 

https://www.irs.gov/pub/irs-pdf/i9465.pdf

SS-4 Form: 

https://www.irs.gov/pub/irs-pdf/fss4.pdf

W-7 Form: 

https://www.irs.gov/pub/irs-pdf/fw7.pdf 

For more information visit: https://www.irs.gov/forms-instructions