If you want to make your money last for 30 years, count on withdrawing no more than 4% of its initial value each year, adjusted for inflation. You should begin your retirement by withdrawing $4,000 a year for each $100,000 you start with. If inflation is running at 2% a year, you would withdraw $4,080 the next year, $4,162 the following year, and so on.

The 4% figure comes as a shock to many people, who assume that they can count on their portfolio for 10% or more in the way of annual payouts. To read more about the reasoning behind the smaller figure, refer to The 4% Solution below.

Balance the present and the future

Here’s where individual preferences become important. While a 4% withdrawal rate gives a well-balanced portfolio an excellent chance of surviving 30 years, it’s very much a pessimist’s strategy. Chances are that things will turn out better than the worst case. If they do, you stand a good chance of leaving behind a tidy fortune. Your heirs will no doubt like this arrangement and if you want to leave them a big bequest, that’s fine — but it’s probably not the optimal deal for you. In fact, if you apply the 4% withdrawal figure to your entire portfolio, you’re probably erring on the side of caution and living on less than you could in retirement.

A better idea is to treat the must-have and nice-to-have portions of your portfolio in different ways. When it comes to your must-have portion, play it safe and count on a 4% annual withdrawal rate. If you calculate, for instance, that you’re going to need to generate $16,000 a year on top of CPP and OAS to provide you with the necessities of your life, you should accumulate at least $400,000 in RRSP savings or the equivalent in corporate pension plans. That $400,000 should be able to fund an inflation-adjusted withdrawal rate of $16,000 for as long as you live.

If you don’t want to worry about the ups and downs of a portfolio, you can use some of your must-have savings to purchase an annuity that will provide you with a guaranteed payout for the rest of your life. Be sure to compare annuities from different companies to get the best possible deal. Look at all the different options available — some annuities pay your heirs a lump sum if you die early; some are inflation-protected; some cover both you and your spouse. Seek the advice of a good fee-only financial planner before buying. Put particular emphasis on making sure that the insurance company that offers the annuity is as financially sound as possible. (Look for at least an AA rating from a rating firm such as A.M. Best. To learn more about these ratings, go to Ambest.com.) You may even want to split the annuity portion of your musthave money between two or more companies to ensure no single disaster can swallow up your savings.

Once you’ve built a fortress around the must-have component of your portfolio, you can treat the nice-to-have portion with more freedom. You can and should plan to run through a chunk of your nice-to-have budget in the early years of retirement, when you’re going to be most active. By the time you turn 75, your appetite for travel and other luxuries is likely to diminish and by the time you hit 85, many of your discretionary expenses will have dropped away completely. If your nice-to-have money is running low at that point, so be it — you will have extracted maximum value from your nice-to-have money when you were still healthy enough to enjoy it, while protecting your future by ensuring that your must-have needs are well covered. That’s the retirement we all want and it’s well within your reach.

The 4% Solution: More on making your money last

William Bengen, a financial planner in California, is the author of a long, but easy-to-understand explanation of how different withdrawal rates can affect your retirement. Originally published in the Journal of Financial Planning, “Determining withdrawal rates using historical data” is a classic in its field. His key finding? A 4% withdrawal rate is the most a truly long-term investor should consider. If you’re looking for a shorter take on the same subject, go to Scottburns.com and check out the “The Spender’s Portfolio and Portfolio Survival” section. The examples used are from the U.S., but the same math applies to Canada.