Most countries tax corporate profits twice: once when the company earns them, and again when shareholders receive dividends. Australia eliminated this double taxation in 1987 through the dividend imputation system — one of the most shareholder-friendly tax regimes in the world.
When an Australian company earns $1,000 profit and pays 30% corporate tax, it distributes the remaining $700 as a fully franked dividend. Attached is a $300 franking credit — a voucher confirming $300 of tax was already paid on your behalf. The ATO treats you as if you earned $1,000 pre-tax, charges you at your marginal rate, and credits the $300 already paid.
If your marginal rate is below 30%, the credit exceeds your tax — the ATO pays you the difference in cash. A retiree paying 0% tax on a $700 fully franked dividend receives the entire $300 credit as a refund, effectively turning a $700 payment into $1,000 in their pocket.
The grossed-up dividend formula: Franking credit = cash dividend × (corporate rate ÷ (1 − corporate rate)). At 30%: credit = cash × 3/7. For base-rate entities paying 25% tax: credit = cash × 1/3 (smaller credit, smaller grossed-up income).