Employment and Support Allowance (ESA) is for people who have an illness, health condition or disability that makes it difficult or impossible to work.
If the Department of Work and Pensions have decided you're not fit for work (i.e. you have limited capability for work), you will be put into either the "Support group" or the "work-related activity group".
You'll get up to £109.30 a week. You'll be in this group if the DWP decide that you're not well enough to work and not well enough to be helped to improve your chance of getting work in the future.
Work Related Activity Group (WRAG)
You'll get up to £102.15 a week. You'll be in this group if the DWP decide that you're not well enough to work but are well enough to be helped to improve your chances of getting work in the future.
Once you're assessed, the extra money you get should be backdated to the 14th week of your claim.
If you were getting a premium during the assessment phase as a carer or someone with a severe disability, this will continue.