The Citizen's Advice Bureau says it isn't a surprise that MSD incorrectly processed 1-in-4 benefit entitlements.
The Ministry of Social Development's revealed its accuracy has slipped over the past few years, largely due to system and resource challenges.
CAB Deputy Chief Executive Andrew Hubbard says the stat stacks up with inconsistencies it's hearing from clients.
He told Mike Hosking it creates stress for those who have been overpaid and are facing debt they shouldn't be held responsible for.
Hubbard says mostly it's to do with a change in circumstance, like they've been a week late or it's taken MSD time to catch up with the change they've told them about.
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