Thousands of people - mainly consisting of women in their 60s and 70s - may have been underpaid a collective sum of £1billion through a substantial state pension error. The issue is thought to largely affect stay-at-home mums who made a claim for Child Benefit before May, 2000.
Should they have made a claim without giving their National Insurance number, their credits may not have been transferred to the system in the correct fashion. This in-turn could mean that those people were wrongly underpaid their Government pension for years.
A person's state pension entitlement is based on their NI record, and you need in the region of 35 qualifying years in contributions to get the full new state pension. It's 30 years for the full basic state pension.