Sequence of Returns Risk Simulator

What is sequence of returns risk and why it matters in retirement

Sequence of returns risk is one of the most misunderstood and underappreciated dangers in retirement planning. It refers to the risk that the order in which investment returns occur - not just their long-run average - can make or break a retirement income strategy. Two portfolios with identical average annual returns over 20 years can produce radically different outcomes for a retiree if one portfolio experiences its bad years at the start of retirement and the other experiences them at the end. This simulator makes that contrast visible by letting you compare how early bad years, late bad years, and steady average returns affect your portfolio balance over 20 years of withdrawals.

During the accumulation phase - when you are building wealth before retirement - sequence of returns risk matters relatively little. If markets fall in year 5 of a 30-year savings journey, you still have 25 years to recover, and your regular contributions actually buy more units at lower prices. But in the decumulation phase - when you are drawing down the portfolio to fund living expenses - the dynamic flips. Poor early returns force you to sell assets at depressed prices to fund withdrawals. Those sold assets can never recover in your portfolio. The remaining balance is smaller, grows more slowly, and the combination of ongoing withdrawals and subpar returns can deplete the portfolio far earlier than averages would predict.

This simulator illustrates the problem with a 20-year model. In the "early bad years" scenario, returns are -10% in years 1 through 5, then your specified average return for the remaining 15 years. In the "late bad years" scenario, returns are at your specified average for years 1 through 15, then -10% in years 16 through 20. The "average returns only" scenario applies your specified return consistently every year. The long-run average return is approximately the same across all three scenarios, yet the portfolio balances can differ dramatically - sometimes by hundreds of thousands.

Why early bad years are so damaging to retirement portfolios

The mathematics of why early bad returns are so damaging comes down to the interaction between withdrawal amounts and a shrinking base. When your portfolio drops 10% in year one, you still need to withdraw your annual living expenses. Those withdrawals now represent a larger percentage of a smaller portfolio. As a result, in year two, growth has to work harder just to keep up - and if year two is also bad, the compounding effect of withdrawals on a depleted portfolio accelerates the depletion. This is sometimes called the "death spiral" in extreme cases: each withdrawal depletes a progressively smaller pool, leaving less and less to recover during eventual good years.

Late bad years are comparatively less damaging because by years 16 to 20, you have already drawn down the portfolio considerably. The absolute dollar loss from a 10% drop on a smaller remaining balance is smaller than the same percentage drop on the full original portfolio. More importantly, the portfolio has had 15 good years to grow and compound before the bad years hit, building a buffer. Retirees who survive to the late stage with a reasonable balance are generally in a stronger position to weather late volatility than they are to survive the same volatility at the beginning.

This asymmetry has practical implications for how you should structure your retirement portfolio. Most financial advisers recommend holding a larger defensive allocation - cash, short-term bonds, stable income assets - in the early years of retirement specifically to reduce sequence risk. The idea is to avoid having to sell equities at a loss in early retirement by funding withdrawals from the defensive portion while equities recover. This is the core logic behind bucket strategies, glide path de-risking, and the common advice to reduce equity exposure as you approach retirement.

Strategies to manage sequence of returns risk

Several practical strategies exist to manage this risk. The simplest is to maintain a cash or short-term bond reserve covering 1 to 3 years of living expenses. If markets fall significantly in early retirement, you draw from this reserve rather than selling equities. This gives the equity portfolio time to recover without being forced to lock in losses.

Dynamic withdrawal strategies offer another solution. Rather than withdrawing a fixed dollar amount each year, you adjust withdrawals based on portfolio performance. In good years, you take a bit more. In bad years, you cut discretionary spending and reduce withdrawals. This flexibility can significantly extend portfolio longevity because you avoid the worst damage of selling at the bottom.

A partial annuity strategy - converting a portion of your portfolio to a guaranteed income stream - can also reduce sequence risk by covering baseline living expenses regardless of market performance. With basic needs funded by guaranteed income, you can afford to leave the remaining portfolio invested in higher-growth assets without the pressure of mandatory large withdrawals during downturns.

This simulator is educational and illustrative. It uses simplified return scenarios to demonstrate the concept of sequence risk, not to predict real market behaviour. Real returns are random, not neatly packaged into "early bad" or "late bad" sequences. For a personalised retirement income plan that accounts for your complete financial picture, risk tolerance, and tax situation, consult a qualified financial planner.