Income Tax (Dividends, Interest and Royalties Withholding Tax) Act 1974

What this law does, mechanically

• Establishes a small stand‑alone statute that links into the existing income tax system (the Income Tax Assessment Act 1936). The Act defines the Assessment Act (s 4) and instructs that the Assessment Act be read together with this Act (s 5).
• Imposes income tax on the particular category of income that is dealt with by section 128B of the Assessment Act. The tax applies to that income "to the extent that" it is payable under section 128B (s 6).
• Fixes three headline rates that apply depending on which subparagraph of section 128B governs the income: 30% where subsection 128B(4) applies; 10% where subsection 128B(5) applies; and 30% where subsection 128B(5A) applies (s 7).
• Comes into force on Royal Assent (s 2) and may be cited by its short title (s 1).

Who is affected and who decides

• The legal incidence is on income that falls within the scope of section 128B of the Assessment Act; that is the class of income that this Act taxes (s 6). The Assessment Act — incorporated by reference (s 5) — contains the detailed rules that determine which payments are caught and who is liable or required to withhold.
• Parliament fixes the tax rates in this Act (s 7). Administrative application (assessment, collection and enforcement) is exercised under the procedures and powers of the incorporated Assessment Act (s 5 and s 6).

Why it matters and how it changes behaviour (mechanisms and trade‑offs)

• It creates a definitive tax charge on the income described by section 128B of the Assessment Act (s 6) and prescribes different statutory rates for different sub‑categories of that income (s 7). Those differing rates create a direct financial incentive to have income fall into the lower‑rated category (128B(5) at 10%) rather than the higher‑rated categories (128B(4) or 128B(5A) at 30%). The Act itself does not define those categories; that determination is made by section 128B in the Assessment Act (s 4, s 5, s 6).