What it means
When planning for the future, businesses and pension funds rely on average life expectancies to calculate how much money they need to set aside. Longevity risk happens when medical advances and healthier lifestyles mean people beat those averages and live well into their eighties, nineties, or beyond.
If you have promised a fixed income to retiring staff, living longer than anticipated creates a funding shortfall. For a company managing its own defined benefit pension scheme, this means the original pot of money runs dry before the final beneficiary passes away, forcing the business to inject extra cash.
This risk matters because it directly threatens cash flow and long term solvency. While living a long life is wonderful for individuals, it creates a massive mathematical challenge for financial planners.
If a pension scheme assumes members will draw funds for an average of fifteen years, but they actually draw funds for twenty-five years, the resulting ten-year gap represents a major liability. Companies can no longer treat employee retirement promises as a static, one-off cost.
Instead, they must constantly monitor changing demographic trends. In practice, companies manage longevity risk through several strategies.
Some choose to buy insurance policies known as longevity swaps, where they pay a fixed fee to an insurer in exchange for the insurer covering any costs if retirees live longer than predicted. Others purchase bulk annuities, essentially handing the entire pension obligation over to a specialised life insurance company for a lump sum.
SMEs without formal pensions still face a related version of this risk through founder retirement planning, ensuring personal savings do not run out prematurely. Imagine baking a pie for a dinner party, assuming guests will eat one slice each and leave at nine.
If your guests stay until midnight and keep asking for second helpings, you run out of food. Longevity risk is simply running out of financial pie because people stayed longer than expected.
In practice
Real-world examples
Example 1
A founder, Sarah, sets aside $450,000 for retirement and plans to spend $30,000 a year until age 80, which is 15 years. She lives to 95, so she needs 30 years x $30,000 = $900,000 in total. Ignoring investment growth for simplicity, she is short by $450,000 and must cut her spending or rely on family.
Example 2
A manufacturing SME runs a legacy pension plan for sixty retired staff, each paid $10,000 a year. Thanks to better healthcare, retirees live four years longer than predicted. That adds 60 x 4 x $10,000 = $2,400,000 of obligations the scheme did not plan for.
Example 3
A local retail cooperative promises lifelong health benefits to retired managers. As medical costs and lifespans rise together, the cooperative pays out 20% more in claims than budgeted. On a $500,000 budget that is a $100,000 overspend every year.
Think of it
Imagine baking a pie for a dinner party, assuming guests will eat one slice each and leave at nine. If your guests stay until midnight and keep asking for second helpings, you run out of food. Longevity risk is simply running out of financial pie because people stayed longer than expected.
Formula
Calculation
Longevity Risk Exposure = (Actual Average Lifespan - Projected Lifespan) x Annual Payout per Person x Number of Beneficiaries
Worked example: 100 retirees live 5 years longer than projected, and each receives $10,000 per year. Longevity Risk Exposure = 5 years x $10,000 x 100 = $5,000,000 in unexpected costs. That is $50,000 of extra cost for each retiree.
This simple version ignores investment returns and discounting, so a real actuary would adjust the figure. It does show why even a small change in assumed lifespan matters: adding just one year to the same group costs 1 x $10,000 x 100 = $1,000,000.Case study
Seen in the real world
This is a fictional, illustrative scenario. Oakwood Logistics, a mid-sized transport firm, maintained a traditional pension scheme for its long-serving drivers. When the company's actuarial review took place in 2023, the trustees discovered a startling trend. Thanks to improved local healthcare, retired drivers were living to an average age of 88, whereas previous models assumed 82. This six-year extension meant Oakwood needed to fund six extra years of annual stipends for its 200 retirees.
At $12,000 per person annually, the unexpected longevity risk added 200 x $12,000 x 6 = $14,400,000 in unfunded liabilities to the company balance sheet. To solve the problem, Oakwood approached a major insurance provider to execute a buy-in transaction, transferring the pension liabilities and the associated longevity risk to the insurer in exchange for a substantial one-off premium. The deal removed the uncertainty from the balance sheet and protected Oakwood from future demographic surprises. The trustees also agreed to refresh their life expectancy assumptions at every review, instead of every few years, so that any future drift would be visible early.
Watch out
Common mistakes
- Assuming historical life expectancy tables will remain completely unchanged over decades.
- Failing to separate investment risk from longevity risk within pension planning.
- Treating the cost of retired employee benefits as a fixed expense rather than a variable liability.
Questions
People also ask
Why is living longer a risk for businesses?
It is a financial risk only if the business has promised fixed payouts or pensions for the duration of a person's life, requiring more funds than initially calculated.
Can small businesses be affected by longevity risk?
Yes, particularly if they sponsor legacy pension schemes or if business owners rely solely on personal savings that must last through an uncertain retirement window.
How do companies protect themselves against this risk?
Companies often use financial tools like longevity swaps or annuity buy-outs to transfer the risk of longer lifespans to specialised insurance companies.