I think there is a balance to be struck between being the most tax efficient and achieving the desired goal of supporting the niece. They don't really go hand in hand.
If the niece has limited means and no real avenue to increase earnings and the OP is confident that this sum of money is not significant to their overall wealth and financial security then I think the best option is a cash gift to the niece.
If you gift €300k, she will receive €40k for Group B when the new thresholds apply. If you have a partner, you can both gift €3k now and €3k in January so another €12k tax free.
The remaining €248k will generate €82k in CAT.
From your €300k gift, your niece would have €218k to purchase a property. So allowing for costs associated with purchase she could probably buy up to €190-200k.
If you provide a loan now of €248k and a gift of €52k to use up CAT thresholds, she will be able to buy a better property but would still face a future CAT bill.
That would be messy if she cannot afford it and you are no longer around to protect her interests. She could try paying down the loan and you could also write off some of it over the years with the small gift exemption. But ultimately she would likely face a CAT bill that she can't afford.
I think the best solution is to take the hit of CAT now and buy a property net of that amount. You can probably save a bit of tax but ultimately you want to avoid a situation where she is in the house but can no longer live there due to a future CAT bill.
If the niece has limited means and no real avenue to increase earnings and the OP is confident that this sum of money is not significant to their overall wealth and financial security then I think the best option is a cash gift to the niece.
If you gift €300k, she will receive €40k for Group B when the new thresholds apply. If you have a partner, you can both gift €3k now and €3k in January so another €12k tax free.
The remaining €248k will generate €82k in CAT.
From your €300k gift, your niece would have €218k to purchase a property. So allowing for costs associated with purchase she could probably buy up to €190-200k.
If you provide a loan now of €248k and a gift of €52k to use up CAT thresholds, she will be able to buy a better property but would still face a future CAT bill.
That would be messy if she cannot afford it and you are no longer around to protect her interests. She could try paying down the loan and you could also write off some of it over the years with the small gift exemption. But ultimately she would likely face a CAT bill that she can't afford.
I think the best solution is to take the hit of CAT now and buy a property net of that amount. You can probably save a bit of tax but ultimately you want to avoid a situation where she is in the house but can no longer live there due to a future CAT bill.