The Court held that where the EPA substitutes its own estimate of waste under s 50X of the Environment Protection Act 1970 (Vic) and issues a notice requiring payment of additional landfill levy, interest under s 50XB(2) accrues from 30 days after the s 50X(4) notice is given — not from the earlier dates on which quarterly levy payments would have been due under s 50SB(3) had the licensee correctly reported the waste. The 'required payment' in s 50XB(2) is a general term that refers to whichever payment obligation is engaged by the relevant statutory provision, and a debt does not fall due until the amount is ascertained. The Court further held that the EPA has no power under the EP Act to extend statutory time limits for payment by a licensee, so purported extensions of time by the EPA did not alter the statutory due date.
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