Why is old whisky expensive? Evaporation, time and scarcity explained
Why a 25- or 30-year-old whisky costs so much more than a 12: the angels' share, decades of storage, casks that never make it to bottling, and demand for old stock.
Old whisky costs more because there is less of it every year it waits. A cask loses spirit to evaporation, ties up warehouse space and money for decades, and may never reach the bottle at all. The casks that do survive meet a market that wants more old whisky than was laid down.
The angels’ share
Oak casks breathe. In a Scottish warehouse about 1% to 2% of a cask’s contents evaporates every year, the loss distillers call the angels’ share. It compounds: at those rates a cask has lost roughly a sixth to nearly a third of its spirit after 18 years, and between a quarter and almost half after 30. A distillery that fills a cask for a 30-year-old is filling it for far fewer bottles than the same cask would give at 12.
Climate changes the sums. In warmer countries such as India or Australia, evaporation can reach 12% a year, which is why whisky from those places matures fast and is rarely aged for long. Whiskipedia explains the angels’ share in detail.
Decades of storage
A cask laid down for a 25-year-old occupies warehouse space for a quarter of a century, needs insurance and inventory checks, and earns nothing until it is bottled. The distiller is also betting that people will still want the whisky in 25 years. Every year of age is a year of storage the price has to cover.
Not every cask makes it
Spirit is filled into the cask at around 63.5% ABV, and its strength drifts as it ages. Scotch whisky must be bottled at no less than 40% ABV, so a cask left long enough can fall below the legal minimum and can no longer be sold as Scotch. Others are judged over-oaked and are used for blending instead of being bottled on their own. So the number of casks old enough and good enough for a 30-year-old single malt is small from the start.
Old stock comes from leaner years
Today’s very old whiskies were distilled decades ago, when many distilleries made less whisky. In the early 1980s the industry cut production sharply and closed a number of distilleries. DCL, a forerunner of Diageo, closed eleven in a single wave, including Brora and Port Ellen; Whiskipedia covers the lost Diageo 11. Whisky from closed distilleries can’t be replaced at all, which is why it sits at the top of the market; see whisky from closed distilleries.
Demand for age statements
For much of the past three decades, demand for aged single malt grew faster than the stocks laid down for it. Producers have responded with more no-age-statement whisky, which lets them use younger stock, and by keeping their oldest casks for limited releases. Whiskipedia on no age statement whisky explains the trade-off. Japanese whisky shows the effect most clearly: Suntory withdrew Hakushu 12 and Hibiki 17 in 2018 because it did not have the aged stock to keep selling them.
What doesn’t explain it
Duty doesn’t. UK spirits duty is charged on the alcohol in the bottle, not on its age, so a 30-year-old pays the same duty as a 12-year-old at the same strength. Older bottlings often cost more in duty only because they are bottled at cask strength.
Compare current prices for 18 year old, 25 year old and 30 year old whisky, or see every cask strength bottling.
Questions
How much whisky evaporates each year in the cask?
Can a whisky be too old to be Scotch?
Does older whisky pay more duty?
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