Abolition of Class 2 NI payments for the self-employed is a trick!
For people with very small business (like I had), it might seem like a saving. However, it also means that they won't be eligible for those years to count towards the state pension. I'm not sure of the actual figures now, but a few years ago, each extra year was worth something just over £4 a week in pension, so well over £200 a year.
So, if you don't have the minimum number of years for a full state pension, it might be worth paying voluntary Class 4 contributions, which are more expensive (and I'm not entirely sure it's possible).
The government tried doing the same thing a few years ago when Sunak was Chancellor, but abandoned the idea when it caused a backlash from very small business owners