HMRC Warns UK Taxpayers of Strict Deadlines and Penalties for Late Self-Assessment Returns Monday, December 29, 2025 hmrc taxreturns penalties selfassessment deadline scams taxfiling childbenefit taxamendments uktax HM Revenue & Customs (HMRC) has issued a stern warning to UK taxpayers about looming deadlines for submitting self-assessment tax returns. The final date to file your online tax return for this period is January 31, 2026. … Read More