Usually, you must first ask the Department for Work and Pensions (DWP) for a mandatory reconsideration, normally within one month of the decision date. You can request this through your Universal Credit journal or by contacting the DWP, explaining what you think is wrong and providing supporting evidence. If the decision is not changed, you can appeal to an independent tribunal, usually within one month of receiving the mandatory reconsideration notice. Check the latest process and deadlines on GOV.UK, and ask the DWP about late requests if you have missed the deadline.