(1) In section 31(1) and (2) of the Taxation Administration Act 1997 , for "informs the taxpayer that an investigation relating to the taxpayer is to be carried out" substitute "commences an investigation into a known or suspected tax default by the taxpayer".
(2) After section 31(2) of the Taxation Administration Act 1997 insert —
"(3) Sub-section (1) or (2) (as the case requires) does not apply in respect of information disclosed by a taxpayer if—
(a) the information is disclosed after the Commissioner has issued an assessment in respect of the known or suspected tax default; and
(b) the tax default involved the failure to lodge a return; and
(c) the taxpayer was required to include the information in the return.".
(3) In section 32(1) of the Taxation Administration Act 1997 , for "has informed the taxpayer that an investigation is to be carried out" substitute "commences an investigation into a known or suspected tax default by the taxpayer".