The figures were released with just days left for people to take action if they want to make top-ups going back as far as April 2006.
The average online top-up payment made is £1,893 and the biggest weekly state pension increase made so far is £119.31, HMRC said.
More than half (57%) of the years topped up have been from 2017 onwards.
A deadline of April 5 has been set for people to check their NI record and fill any gaps stretching as far back as April 6 2006.
From April 6 2025, people will only be able to make voluntary NI contributions for the previous six tax years, in line with normal time limits.
However, people who are struggling to get through on helplines can complete a callback request form online to ask the Department for Work and Pensions (DWP) to discuss paying voluntary NI contributions.
As long as the request has been submitted by April 5, people will still be able to pay after the deadline has passed.
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A Government spokesperson said previously: “Our new online tool will mean that people are able to make top-up payments after the April 5 deadline, provided they complete the callback request form ahead of that date.
“This will enable us to ensure no one misses out, and to suitably manage demand as the deadline approaches.”
People can go to gov.uk/check-state-pension to see how much state pension they could get and if they could increase it.
Whether it is worth someone topping up will depend on individual circumstances.
In general, people need to build up 35 years of NI contributions to get the full new state pension.
Money Saving Expert Martin Lewis addressed the “last chance” for many to boost their state pension in his latest Martin Lewis Podcast with BBC Sounds.
Taking to X, formerly known as Twitter, the Money Saving Expert founder said: “If someone hasn’t checked this yet and is between the age of 40 and 73, without exaggeration it could be worth £10,000s, so check.
“If you miss it now the door shuts forever on April 5.”
