From a financial point of view: Assuming that your forward contract does not have any mismatch (for example, it will expire in March next year and the assets are identical whisky) or counterparty risk, your selling price has been locked at the strike price. From buying a forward contract to March tomorrow, the price changes in the spot market will not affect your income.

From an accounting point of view: the inventory value of whickey should be determined by your production cost or purchase cost. Impairment will only occur when your cost is higher than the sales price of the product. I'm not sure about the forward contract because I'm not sure if there is a deposit.