A builder buys a derelict property for €75,000. He spends €25,000 on refurbishment (total cost €100,000). The fully refurbished property is sold for €150,000.
The builder spent 25% of his total costs on refurbishment. At the time of sale, he tells you this percentage. This is then applied to the sale price and results in a total claim for relief of €37,500 (€150,000 x 25%).
If the property is first used, after refurbishment, as your main residence before 1 January 2023, the relief is spread evenly over ten years. This results in a deduction of €3,750 per annum.
If you are unable to claim the full 10% relief in one year, you cannot carry forward the unused relief and it is lost.
If the property is first used, after refurbishment, as your main residence on, or after, 1 January 2023, the relief is spread over seven years. You can claim 15% of the qualifying costs each year for the first six years. You can claim the final 10% of the qualifying costs in the seventh year. This results in a deduction of €5,625 per annum for the first six years and €3,750 in the seventh year. If you are unable to claim the full relief in one year, you can carry it forward and claim it in another year. You must claim the relief carried forward within the ten-year period or it is lost.