What actually changed after Brexit, and what pre-Brexit expats keep — explained without the jargon.
The UK-EU Withdrawal Agreement protects the rights of British nationals who were already living in EU countries before the Brexit transition ended on 31 December 2020. If your residency was established before then and you've remained resident since, the Agreement protects your entitlement to certain UK benefits.
The key date: 31 December 2020. Established residency before then, and remained resident since, and the Withdrawal Agreement protects your entitlement. Moved after that date, and different rules apply.
If you were already resident in the EU before 31 December 2020, your entitlement to benefits like the State Pension, Attendance Allowance and Carer's Allowance remains exportable. Brexit didn't remove these rights for pre-Brexit movers — it left them in place.
If you moved after 31 December 2020, you're generally governed by the UK-EU Trade and Cooperation Agreement instead, which can mean different conditions apply to your benefit claims. It's worth getting specific advice for your situation.
For pre-Brexit expats, the bureaucracy has increased but the entitlements remain. The single most common mistake we see is people assuming — wrongly — that moving abroad, or Brexit itself, ended their UK benefit rights altogether.