Cyfrifwch y Dreth Enillion Cyfalaf ar werthiant eiddo yn y DU, gan gynnwys rhyddhad Prif Breswylfa.
Rhowch brisiau prynu a gwerthu
Defnyddiwch y prisiau go iawn a dalwyd ac a dderbyniwyd, gan gynnwys unrhyw addasiadau ar gyfer rhan-gyfnewid.
Ychwanegwch gostau caniataol
Cynhwyswch gostau prynu (SDLT, ffioedd cyfreithiol, arolwg), costau gwerthu (asiant tai, ffioedd cyfreithiol), a chostau gwelliant go iawn (estyniadau, trosi lofftydd — nid trwsio).
Rhowch fanylion prif breswylfa os yw'n berthnasol
Os oedd yr eiddo erioed yn brif gartref i chi, rhowch y misoedd y buoch yn byw yno o'i gymharu â chyfanswm y misoedd o berchnogaeth. Mae 9 mis olaf y berchnogaeth bob amser yn ddi-dreth.
Adolygwch eich rhwymedigaeth CGT
Gweler eich enillion, rhyddhadau perthnasol, swm trethadwy, CGT sy'n ddyledus, ac a oes angen i chi riportio o fewn 60 diwrnod.
Selling a second home or buy-to-let in 2026/27 means Capital Gains Tax at 18% or 24% on the gain above your £3,000 annual exemption, reported and paid within 60 days of completion. Full worked examples.
Selling a rental property while tenants are still living there doesn't change the Capital Gains Tax calculation, but it does affect the sale process and the 60-day reporting deadline. What matters in 2026/27.
What happens after you submit your Self Assessment return — refunds, balancing payments, amendments, HMRC enquiries, the SA302 for mortgages, and the 5-year record-keeping rule
Disclaimer: All results are estimates for guidance only and do not constitute financial, tax or legal advice. Always consult a qualified professional.
