Had a large glass replacement company in my area that had been giving out kickbacks to truck fleet rental and lease locations for almost 4 years to inhance business opportunities At the end of each month they'd pay out a rebate check to service managers or rental managers. Guess what happened? IRS finally caught up with them and wanted to see 1099's for all these cash rebate checks written before they'd allow them to write it off as a company expense.
Needless to say, none of these managers or their companies were happy with this glass company requiring them to fill out these 1099's because that meant they had to go back 4 years to re-adjust earned income on their tax fillings.
Probably explains why my monthly donuts drops haven't had much effect getting into these accounts for the last 3 years which I don't consider a kickback sense I don't claim it on my taxes.
Gotta love it

Now I'm on a fair playing field with some of these big glass companies. Finally getting some of these once untouchable accounts.