You usually need to ask the Department for Work and Pensions (DWP) for a mandatory reconsideration before appealing, normally within one month of the decision. Explain which part you disagree with and provide any supporting evidence; you can request this through your Universal Credit journal, in writing or by phone. If the DWP does not change the decision, you can appeal to an independent tribunal through HM Courts and Tribunals Service (HMCTS). Check the latest process and time limits on GOV.UK, and consider getting advice from a benefits adviser if your case is complicated.