Ann: AGM - Chair and Managing Director address to Shareholders, page-19

Like many rules, there are exemptions ,so best to DYOR. But a quote below may assist some who receive larger franking credits $'s.

"The 45 day rule The 45 day rule (sometimes called dividend stripping) requires shareholders to have held the shares ‘at risk’ for at least 45 days (plus the purchase day and sale day) in order to be eligible to claim franking credits in their tax returns. If you have held your share for less than 45 days then you cannot claim the franking credits in the dividends you have received. The rule is designed to prevent franking credits to be claimed by share traders who hold shares for a short period of time and then sell as soon as they qualify for a dividend. The rule applies to all individual taxpayers, entities and SMSF."