We recommend that you do not list any account numbers as you may have to provide additional W-9 forms for accounts you do not include.
You can get one online for free here.
In case that you have been asked to carry out the wrong form, you should request the accurate one.
Most individuals can leave this blank.
Line 7 — Account number s This is an optional line where you can fill in any account numbers your employer may need.
This should be the tax classification of the person or entity name that is entered on line 1.