Taxation Administration Act 1953

If, at the end of an *instalment quarter in an income year, you are a *quarterly payer who pays on the basis of GDP‑adjusted notional tax who is liable to pay an instalment for that quarter, the amount of your instalment for that quarter is:

unless paragraph (b) or (c) applies—the amount that the Commissioner works out under Subdivision 45‑L, and notifies to you, as the amount of the instalment; or

if you choose to work out the amount of the instalment on the basis of your estimate of your *benchmark tax for that income year, and you notify the Commissioner in accordance with subsection (2)—the amount worked out under Subdivision 45‑M; or

if paragraph (b) applied to your instalment for an earlier *instalment quarter in that income year—the amount that the Commissioner works out under Subdivision 45‑M, and notifies to you, as the amount of the instalment.

If the amount of the instalment is worked out under paragraph (1)(b) on the basis of your estimate of your *benchmark tax for the income year, you must notify the Commissioner in the *approved form, on or before the day when the instalment is due (disregarding subsection (3)), of the amount of that estimate.

If:

after the end of an *instalment quarter the Commissioner notifies you of an amount as the amount of your instalment for that quarter; and

the amount of your instalment for that quarter is not worked out under paragraph (1)(b);