“We looked at our account balances, and based on our back-of-the envelope thinking, it looks like we’re fine.” Amy said with not a small amount of pride.
“That’s great. Tell me how you came up with your results,” I responded.
“We added up all our accounts and figured with a 6% return we should be able to get by just fine in retirement.”
“That’s wonderful,” I replied. “So tell me, how are you going to guarantee 6% every single year?”
The question hung in the air like a rain-laden cloud. The storm was on the horizon, only Amy and Patrick didn’t know it. Clearly, this question was not one they had considered.
We humans tend to be great at simplifying even the most complex of problems; it’s a habit we fall into in order to have our problems make sense in our universe. In Amy and Patrick’s case, their desire to find a satisfying answer led them to make careless assumptions or omit important facts that significantly impact the outcome.
Many people engage in back-of-the-envelope thinking without taking some crucial steps and examine important facts. Here’s how:
When it comes to important life transitions like retirement, perspective, judgment and objectivity are vital to prevent mistakes that can lead to disaster. Before you rely on back-of-the-envelope planning, consider Amy and Patrick and their near disaster of arriving at conclusions based on incomplete information, lack of full knowledge and understanding and inappropriate assumptions.
To avoid going down this path yourself, try the following instead:
Leave the back of the envelope for your grocery list or to do’s, not for your financial planning. It’s too important.