Вот как я рассчитал общую сумму:
DECLARE @Current_LeaseEndDate DATE = '01/31/2021' --3 Years
DECLARE @PercentIncrease FLOAT = .05
DECLARE @Principal FLOAT = 100
SELECT
YEAR(DATEADD(day, 1, CAST(@Current_LeaseEndDate AS VARCHAR(10))) + 1),
CASE WHEN YEAR(DATEADD(day, 1, CAST(@Current_LeaseEndDate AS VARCHAR(10))) + 1) >= YEAR(GETDATE())
THEN @Principal * POWER((1 + @PercentIncrease), YEAR(DATEADD(day, 1, CAST(@Current_LeaseEndDate AS VARCHAR(10))) + 1) - YEAR(GETDATE()))
END AS MEH