A W9 form is required for all option exercises, sale of shares, dividend payments or dividend reinvestments for US Citizens or US Resident aliens.

If a W9 form is not received prior to the sale of shares, a dividend payment or dividend reinvestment, the stockbroker can withhold an additional 28% tax on top of the standard tax rate to be compliant under the Foreign Account Tax Compliance Act (FATCA).

To avoid any additional tax being withheld, you should complete a W9 from online within your MyDiageoShares portal account.