Does a CGT return cover my Self Assessment, or do I need to file both?

They're separate obligations, and both may be required. The 60-day CGT return is a standalone filing that must be done within 60 days of completion — it's not part of your annual Self Assessment return. If you already file Self Assessment, you'll also need to declare the gain on your annual return for the tax year the sale took place in, even though you've already reported it via the 60-day return. The tax itself is paid via the 60-day return; the Self Assessment entry reconciles it for the full year. It sounds like double admin, but we handle both as part of our service. If you need a CGT return plus a Self Assessment return for the same year, message us on live chat and we'll work out the best way to handle everything together.