Key facts
•Decisions on your tax credit entitlement can be changed by a revision by HM Revenue and Customs, provided certain grounds are met.
•If you think a decision is wrong, you can ask for it to be looked at again (reviewed). This is called a mandatory reconsideration.
•If you are unhappy with the outcome of a mandatory reconsideration, you can appeal to an independent tribunal – the First-tier Tribunal.
•There are strict time limits for carrying out a revision, applying for a mandatory reconsideration and appealing.