The Government is to rush through legislation to retrospectively fix a measure that has meant for the past 17 years it has underpaid many beneficiaries by one day.
The legislation is to go through Parliament under urgency today and will also mean any one who has not already applied for the extra day's benefit will immediately lose the chance as soon as the bill passes.
It follows the discovery last year that since a 1998 law change Work and Income had wrongly been starting benefit payments the day after a stand-down period ended instead of the day it ended.
The Government's fix will change the wording of the law to clarify payments will begin the day after the stand-down period. It will apply retrospectively to 1998, effectively post-validating what is likely to be thousands of underpayments.
Only those who had lodged a review before the law passes would have that review processed. However, there would be a seven-week review period for those whose benefits started after the Social Security Appeal Authority identified the issue in a ruling in May 2014. It was not until September this year that Work and Income started paying the day the stand down ended to ensure it was complying with the law until that law could be changed.