•If a decision is wrong or no longer correct, it can be changed by a new decision – called either a ‘revision’ or a ‘supersession’.

•You can apply for a revision or a supersession, or the DWP, local authority or HM Revenue and Customs can carry one out because it wants to change your award.

•In some cases, you do not need to show any grounds for a revision, but you must ask for one within a set time limit. In other cases, you can ask for a revision at any time, but you must show there are specific grounds.

•The date on which a revision or a supersession takes effect determines the date from when you are paid arrears if you are entitled to more benefit, or the date from when you have been overpaid if you are entitled to less benefit.

•You can also challenge a decision by appealing to the First-tier Tribunal. Unless the benefit is housing benefit, you must apply for a mandatory reconsideration first and the decision maker considers whether to carry out a revision.