Posted in News Should I buy extra NI years to increase my state pension before the 5 April deadline? March 4, 2025 As long as you get a payment or callback request in by 5 April. you can buy missing years going back to 2006/07. After that you can only go back six years. https://www.dailymail.co.uk/money/pensions/article-14459809/How-buy-extra-NI-years-increase-state-pension.html?ns_mchannel=rss&ns_campaign=1490&ito=1490