The Auditor-General has announced she will not be investigating Pansy Wong's travel expenses.
The MP for Botany on Tuesday morning announced her retirement from Parliament, sparking a by-election to be held in March next year.
The move follows her resignation from the Cabinet in November over her husband's misuse of the MPs' international travel perk.
Auditor-General Lyn Provost says she has actively considered whether to carry out an inquiry in Mrs Wong's travel expenses.
However, she says clarifying the rules and administration for spending by MPs and ministers will do more public good than mounting another inquiry.
Earlier on Tuesday, the Office of the Auditor-General released a report which found that system for providing support to government ministers has significant problems.