The period of a lease is 20 years. The rent for the first 10 years is €30,000 per year. For years 11 to 15, the rent is €40,000 per year and for years 15 to 20, it is €45,000 per year.
The total rent payable over the 20 years is €725,000.
The average annual rent is €36,250 (€725,000 ÷ 20).
You must pay Stamp Duty on €36,250 at the rate of 1%.