A Universal Credit sanction is a temporary reduction in your payment if the Department for Work and Pensions decides you did not follow a requirement in your claimant commitment, such as attending an appointment or taking agreed steps towards work. The length and amount depend on the requirement, your circumstances and any previous sanctions, and the decision should be explained in your journal or letter. If you have a good reason, contact your work coach promptly and ask for a mandatory reconsideration; you may also be able to apply for a hardship payment. Check the latest guidance on GOV.UK for current rules.