Please outline what you would like to leave to your partner. Please note however that as you are not married or in a Civil partnership you will be deemed to be in the "Group C" threshold for Capital Acquisitions Tax, which means that you can only leave a maximum of €32,500 to your partner before they will be taxed at a rate of 33% on the balance above this.
Your spouse or civil partner has a legal right to half of your estate where you have no children. If you have children, your spouse or civil partner is entitled to one-third of your estate. Most people provide that 100% of their estate goes to their spouse, but each situation is different. There are no tax implications in leaving a gift to a spouse or Civil Partner.