If you have a second non-PAYE income from which you earned more than €5,000, then you are required by law to complete a tax return every year.
If you have rental income from which you earned more than €5,000, then you are required by law to complete a tax return every year.
Capital Gains Tax (CGT) is a tax charged on your capital gains (profit), made by selling assets you own. It needs to be paid by the person making the sale. The gain/profit (the difference between what you paid and what you sold it for) is considered taxable income.
If you plan to leave an inheritance for your loved ones, it may be liable to Inheritance Tax. Inheritance tax is the amount of tax that the recipient has to pay if what you leave them is valued over a certain thresholds or limits.