The Financially Optimal Decision Isn’t Always the Best Decision

When a client asks whether they should do A or B, we often turn to planning tools and a “spreadsheet” approach to determine which choice is financially optimal. That would be sufficient if all we wanted to do was maximize a number. But people do not make decisions based solely on financial optimization. We also have nonfinancial preferences, and those preferences can be quite strong.

In this post, I will share real experiences from behavioral finance experts in which the psychological benefit overruled the financially optimal choice. In other words, they knowingly left money on the table to pursue something they valued more. And if we really want to help clients make the best decision for themselves, we ought to be sure we are looking at both the financial and psychological tradeoffs.

Example: Do I Pay Off My Mortgage?

I was recently a guest on Daniel Crosby’s Standard Deviations podcast. During our conversation, Daniel mentioned that he paid off his mortgage years ago, even though interest rates were low.

From a strictly financial perspective, that decision may not have been optimal. If the mortgage rate was low and the money could have earned a higher return in the market, maintaining the mortgage might have produced greater long-term wealth.

But Daniel said paying it off was absolutely the right decision for him, and he has no regrets.

Morgan Housel has publicly shared that he does not have a mortgage. I also made the same decision years ago, paying off my mortgage even though I knew investing the money would likely produce a better financial outcome. And in all cases, given what the market has done in the past several years, we all left money on the table. But it wasn’t about that. In our cases, maximizing wealth was not our only objective.

That is an important distinction.

What Are We Actually Optimizing?

Traditional financial analysis begins with the numbers. In the case of a mortgage, an advisor might compare:

The mortgage interest rate
The expected return from investing the money
The tax consequences of either decision
The client’s liquidity needs
The effect on long-term financial projections
The risk of becoming house-rich and cash-poor

This analysis is necessary. A client should understand the financial cost of paying off a low-interest mortgage instead of investing the money.

But identifying the mathematically optimal choice is not the same as identifying the best choice for the client.

Financial optimization generally seeks to maximize measurable outcomes such as ending wealth, portfolio returns, tax efficiency, or lifetime income. Psychological optimization seeks to improve outcomes that are harder to place in a spreadsheet, including peace of mind, confidence, freedom, and the ability to remain committed to a plan.

Neither form of optimization should automatically take precedence. The advisor’s role is to help the client understand the tradeoff.

A client might reasonably accept a lower expected return in exchange for:

Fewer financial obligations
Less anxiety during periods of uncertainty
Greater monthly cash flow
More flexibility when changing careers or retiring
A stronger sense of financial independence
Less temptation to abandon an investment strategy during a downturn

Those benefits are real, even if financial planning software cannot assign them a precise value.

The Difference Between Expected and Experienced Returns

The argument for keeping a low-rate mortgage often assumes the client will invest the available money, leave it invested, and earn the projected return over many years.

That assumption may be reasonable, but it is not guaranteed.

The client might spend some of the money. They might become nervous during a bear market and sell. They might continually change strategies. Or they might hold the money in cash while waiting for a more attractive opportunity.

The expected return shown in a financial projection only matters if the client can remain committed long enough to experience it.

Suppose keeping a mortgage and investing the money has a higher expected return. If the debt causes the client persistent anxiety or makes them more reactive during market declines, the mathematically superior strategy could produce an inferior real-world result.

This is where psychological optimization can also support financial outcomes. A client who feels secure may be more patient, less reactive, and better able to tolerate uncertainty elsewhere in the plan.

The psychologically comfortable decision is not always financially inefficient. Sometimes it makes the rest of the plan more durable.

Psychological Comfort Is Not a Blank Check

This does not mean advisors should endorse every decision that makes a client feel better.

Fear can lead clients to hold too much cash, avoid necessary investment risk, claim Social Security prematurely, or sell during a market decline. Immediate emotional relief can come at an enormous long-term cost.

The goal is not to eliminate discomfort. Some degree of uncertainty is unavoidable when pursuing meaningful financial goals.

Instead, advisors should distinguish between a decision that provides lasting psychological value and one that merely offers temporary relief from anxiety.

Paying off a mortgage may create greater freedom for decades. Selling a diversified portfolio during a bear market may reduce anxiety for a few weeks while permanently damaging the plan. Both decisions can make someone feel better in the moment, but they are not psychologically or financially equivalent.

A useful question is:

Will this decision create lasting improvement in the client’s life, or is it primarily an attempt to escape a temporary emotion?

That question moves the discussion beyond what the client wants to do and toward why they want to do it.

The Value of Optionality

Eliminating a mortgage also changes how a client experiences future income.

Without a monthly mortgage payment, cash flow increases. That additional cash can be directed toward retirement accounts, taxable savings, charitable giving, family support, or experiences that might otherwise be postponed until retirement.

This is another form of optionality.

The household may be able to withstand a period of lower income. One spouse may be able to change careers. Retirement may become possible earlier. The client may feel more comfortable spending money on meaningful experiences because a major recurring obligation has disappeared.

The decision may reduce expected ending wealth while increasing flexibility throughout the client’s life.

That tradeoff cannot be evaluated solely by comparing a mortgage rate with an assumed market return.

Better Questions Lead to Better Decisions

When clients face decisions involving a tradeoff between financial and psychological optimization, advisors can expand the conversation with questions such as:

What would paying off this debt change for you?
How often do you think or worry about this obligation?
Would eliminating it change any decisions about work, retirement, or spending?
If you kept the mortgage and invested the money, how confident are you that you would remain invested?
How much liquidity would remain after paying it off?
What are you willing to give up financially in exchange for greater certainty?
Which decision are you more likely to regret?
Are you seeking lasting freedom or temporary emotional relief?

These questions do not replace financial analysis. They complete it.

The advisor should still calculate the cost, identify the risks, and explain the alternatives. But once the client understands the financial consequences, the decision should reflect what the money is ultimately supposed to accomplish.

Optimizing the Client’s Life

Financial planning is sometimes presented as a search for the single best answer. In reality, many decisions involve competing benefits.

More liquidity may mean less return. More certainty may mean less upside. Greater protection may mean higher costs. Enjoying money today may reduce the amount available in the future.

There is no formula that can decide how much peace of mind, freedom, or enjoyment should be worth to a particular client.

That is why behavioral guidance is such an important part of financial advice. Advisors do more than calculate which strategy is expected to produce the highest number. They help clients decide which tradeoffs will allow them to use their money well and remain committed to their plan.

Sometimes the best decision will be the one that maximizes wealth.

Other times, the client may knowingly accept a lower expected return in exchange for greater security, flexibility, or enjoyment.

The objective is not to maximize every possible dollar. It is to make informed financial decisions that support the life the client actually wants to live.