How is this calculated?
Irish CGT applies at a flat 33% rate on most disposals — there are no income-stacking bands like the UK system. Each individual is entitled to an annual personal exemption of €1,270 on net chargeable gains. The exemption is not transferable to a spouse or civil partner.
When losses are in play, Revenue applies a statutory order: current-year losses are set off against current-year gains first, then the €1,270 exemption applies to any remaining net gain, and finally brought-forward losses from prior tax years are used last. This means current-year losses can “waste” the exemption — if they fully cancel out your gains, the €1,270 cannot be deferred to a future year.
Out of scope for this calculator: the 40% windfall rate on certain residential development land gains, pre-1974 cost-basis indexation, the 4-week share-matching rule against bed-and-breakfasting, Principal Private Residence Relief, Retirement Relief, Entrepreneur Relief, and the separate 41% exit tax regime governing investment funds and life-assurance bonds.