Managed migration is taking place for some tax credit claimants by geographical area. The government aims to have moved all Tax Credit claimants off Tax Credits by the end of 2024/25. A government guide gives more information. A small proportion of people don't claim Universal Credit when sent the migration notice, the government citing areas for improvement-
'there is confusion that Universal Credit is only for people ‘out of work’, rather than also being for those ‘in work’
there is a belief that they would be moved to Universal Credit automatically some individuals had recently renewed their tax credits so did not believe they would need to claim Universal Credit
there is a belief by some claimants that they are not able to make a claim to Universal Credit if they have capital over £16,000'
Remember- those on just ESA or ESA and Housing Benefit are not scheduled to enter managed migration until 2028.