I know Azoogle Ads can't "pay you" until you submit your W9 form, but will they still credit your account if you make any conversions "before" you do that?
Are you sure about that or are you just guessing? I emailed my affiliate manager about this but he never responded. The only answer he gave me was that they couldn't payout until the W9 was received. But that doesn't answer whether or not your get credit for anything before they get the W9.
Well, I remember that when my account was opened I started making conversions and having a balance before I sent in my tax forms...
Yes, you always get credit for your leads. You simply do not get paid until after you submit your w9.