Sickness benefits are payments made to individuals who are unable to work, or whose capacity for work is reduced, due to illness or injury. In UK and Irish legal practice the term is descriptive rather than a single defined concept, and encompasses a range of statutory and contractual entitlements.In England and Wales, Scotland and Northern Ireland, key statutory sickness benefits include Statutory Sick Pay (SSP) under the Social Security Contributions and Benefits Acts, and contributory or means-tested benefits such as New Style Employment and Support Allowance and Universal Credit. In Ireland, core schemes include Illness Benefit and Disability Allowance under the Social Welfare Consolidation Acts.Sickness benefits may arise under social security law, employment law (for example, contractual sick pay schemes and collective agreements), insurance law (income protection policies) and personal injury/clinical negligence practice (where recoverable loss of earnings is offset by benefits received).For practitioners, accurate identification, quantification and treatment of sickness benefits is important for advising on employee rights, discrimination and reasonable adjustments, tax and National Insurance/PRSI implications, overpayments and recovery, and for applying offset and recoupment rules in litigation and settlement.