Why "Buy Term and Invest the Rest" Tells Only Half the Story

Andrew Weber is a senior director of Planning, Thought Leadership, and Research for Northwestern Mutual.

The advice sounds straightforward: Buy cheap term life insurance, invest the money you save on premiums, and let your portfolio do the heavy lifting. It's a popular framework—but it's also an incomplete one. The question isn't which option is better; it's what combination fits your life. For most people building a long-term financial plan, the "buy term and invest the rest" argument leaves out some meaningful considerations. Understanding what it misses can help you make a more informed decision about how life insurance fits into your overall plan.

What "buy term and invest the rest" actually means

You've probably heard the advice before—maybe from a friend, a podcast, or a quick internet search. Buy the cheapest life insurance you can find, put the premium savings into the market, and watch your wealth grow. It's a tidy argument: Keep insurance simple, maximize your investments, and don't pay for features you supposedly don't need.

The logic has a certain appeal. And for some people in some circumstances, it holds water. But for most people building a long-term financial plan, it leaves some important things out. Understanding what the comparison misses—and why—can help you make a more informed decision about the role of life insurance in your overall plan.

Where the argument has merit

To be fair: Term life insurance is a legitimate, cost-effective choice for covering specific needs during specific periods. The "buy term and invest the rest" approach may be a strong fit for people whose primary need is temporary income replacement, who have strong investing discipline, and who are comfortable relying on market-based assets for long-term growth.

No one is suggesting you skip investing. The question is whether replacing permanent life insurance entirely with a term-plus-investments approach gives you everything your plan may need. Whole life may be worth considering when permanent protection, guaranteed value, tax-advantaged access, or added portfolio stability are priorities. For many people, the best answer may include both.

What the comparison leaves out

The "buy term and invest the rest" strategy rests on a set of assumptions that sound reasonable in isolation but often don't survive contact with real life: that your need for coverage will end on schedule, that you'll invest consistently across decades, and that market-driven assets alone are sufficient for long-term financial security. Each of those assumptions deserves a closer look.

The planning gap that stat reflects is exactly where the "buy term and invest the rest" argument tends to break down. The strategy rests on assumptions that sound reasonable in isolation but often don't survive contact with real life.

Term insurance expires—permanent protection often doesn't

Term insurance is designed to cover a specific window of time, typically 10, 20, or 30 years. The assumption baked into the "buy term" approach is that your need for life insurance protection will disappear once that window closes—that your mortgage will be paid off, your kids will be grown, and your investments will have compounded enough to protect the people who depend on you. That's a reasonable scenario to plan for. It's also not guaranteed to happen on schedule.

Life doesn't follow a tidy timeline. Dependents change. Businesses get started. Estates need protection. Many people reach their 50s and 60s with ongoing needs that term insurance—which has already ended or become prohibitively expensive to renew—can no longer address. Whole life insurance, by design, provides lifetime coverage. The death benefit is there when you die, whether that's at 65 or 95.

Permanent insurance death benefit coverage can also help address needs that may become more important in retirement. When one spouse dies, the surviving spouse may see a reduction in Social Security or pension income while still needing to maintain much of the same standard of living. That shift can be compounded by higher tax rates as a single filer. Having some death benefit coverage in place can help provide resources to offset that income gap.

Cash value is not just a savings feature

One of the most misunderstood elements of whole life insurance is its cash value component. Cash value is not a savings account bolted onto an insurance policy. It's a guaranteed, tax-deferred asset that grows over time regardless of market conditions—something investments don't offer. Even diversified portfolios can lose value in down years. For example, in 2022, both stocks and bonds posted sharp losses, with the S&P 500 down nearly 20 percent and the Bloomberg U.S. Aggregate Bond Index down about 13 percent.¹ Whole life cash value, by contrast, is not tied to stock or bond market performance, meaning it won't decline during a market downturn. You can access cash value for a range of needs—a business opportunity, a child's education, a liquidity need in retirement, or simply as a stable foundation within a broader financial plan—that access is structured, typically through policy loans or withdrawals, and may affect the policy's death benefit and other values.

That stability is meaningful precisely because your investments don't offer it. The cash value of a whole life policy grows on a different track than your portfolio—which means the two can work together in ways that a term policy and investments simply cannot.

Investment discipline isn't a guarantee

"Invest the rest" works only if you actually invest the rest—consistently, across decades, without interruption. But in real life holding that line can be difficult. Market volatility leads to emotional decisions. Life expenses crowd out contributions. Time horizons shift. A whole life insurance policy, by contrast, builds value through a structured premium payment. It introduces a form of financial discipline that doesn't depend on your willingness to stay the course in a difficult market.

How whole life insurance fits a broader financial plan

Understanding the difference between term and whole life insurance is the first step toward knowing how to use each one effectively in your plan.

When you think about how whole life insurance works alongside your other financial tools, the picture changes. It's not an either/or choice between protection and growth. It's a question of how each asset in your plan contributes to the whole.

A safer asset that grows alongside your investments

Whole life insurance cash value can serve as a safer asset within a comprehensive financial plan—a stable counterpart to the market-driven assets in your portfolio. Because it's not correlated to the stock market, it can allow you flexibility in how you structure your other assets. You're not giving up growth potential; you're giving your growth-oriented assets more room to work.

Independent research supports this approach. Northwestern Mutual research examining historical periods of high interest rates found that strategies combining whole life insurance with investments consistently supported more retirement income or a larger legacy than investment-only approaches—even when whole life insurance was purchased during periods when other safer assets carried higher short-term rates. The research found that over a 65-year historical period, the average dividend interest rate on whole life insurance exceeded the average bond yield, contributing to better long-term outcomes for the combined strategy.²

A volatility buffer that can help in retirement

One of the most practical uses of whole life cash value is as a volatility buffer in retirement. If you're drawing down assets in retirement and the market drops sharply, you face a choice: Sell investments at depressed values, or find another source of funds to cover your expenses while you wait for a recovery. Whole life cash value gives you that other source. It doesn't decline with the market, so you can draw from it during downturns without locking in losses—a meaningful advantage when sequence-of-returns risk is a real concern.³

What role can term insurance play?

For many people—particularly in the early stages of building wealth, when cash flow is tight and death benefit need is highest—term insurance plays an important role by delivering the protection that's needed at a price that works. And most complete financial plans include both term and whole life insurance, using term coverage to address larger short-term protection needs while whole life builds long-term cash value and permanent protection.

The honest answer is that the right structure depends on your goals, your timeline, how you define financial security, and what trade-offs you're willing to make. There's no universal formula.

The right mix depends on your goals

The "buy term and invest the rest" framework offers a starting point for a conversation about life insurance. What it doesn't offer is a complete answer—because complete answers require context. Your income, your dependents, your risk tolerance, your time horizon, your desire for guaranteed growth versus market-driven returns: All of these factors shape what a well-designed plan looks like for you. Your Northwestern Mutual advisor can help you work through those variables and design a strategy—whether that means term coverage, whole life, or a combination of both—that fits your goals and your life.

Frequently asked questions

Is "buy term and invest the rest" a good strategy?

It can be a reasonable approach for some people, particularly those with short-term protection needs and strong investment discipline. But it rests on assumptions—that your need for coverage will end, that you'll invest consistently, and that market-driven assets alone are sufficient for long-term financial security—that don't apply to everyone. For many people, a plan that includes both term and permanent life insurance supports both protection and long-term planning needs.

What is cash value in whole life insurance, and how does it work?

Cash value is the portion of a whole life insurance policy that builds value over time as you pay your premiums. It grows on a guaranteed, tax-deferred basis and is not tied to stock market performance—meaning it won't decline when the market drops. You can access your cash value at any time for any reason, though doing so will reduce your death benefit. Over time, cash value can become a flexible financial resource within a broader plan.

Can you have both term and whole life insurance?

Yes. Many financial plans include a combination of term and whole life insurance. A common approach is to use term insurance to cover a large, specific death benefit need at a lower cost, while whole life insurance builds guaranteed cash value and permanent protection over the long term. Your financial advisor can help you find a mix that fits both your budget and your goals.

What happens to term life insurance when it expires?

When a term life insurance policy expires, coverage ends; no death benefit is paid unless you die during the term. Some term policies can be renewed or converted to permanent coverage, though costs may be higher. If your financial situation or protection needs have changed by the time your term ends, you may find yourself without coverage at a time when you still need it.

How does whole life insurance support retirement planning?

Whole life insurance can play several roles in retirement. The cash value you've accumulated over decades can serve as a tax-efficient source of funds, a volatility buffer during market downturns, and a stable asset that complements your investment portfolio. The death benefit also provides peace of mind and can support legacy goals regardless of when you pass away. Some policies may also offer the option to add a long-term care benefit rider, which can help you get a head start on offsetting potential long-term care risks. Working with your Northwestern Mutual advisor can help you understand how to incorporate these features most effectively into your retirement strategy.

¹ S&P Dow Jones Indices, SPIVA U.S. Year-End 2022; Morningstar, iShares Core U.S. Aggregate Bond ETF performance data.

² This reflects a historical research scenario, not a guarantee of future results. Individual outcomes will vary. The Dividend Interest Rate is not the rate of return on a policy and is only one factor used in determining the total dividend paid on a policy. The majority of the dividend payout is a result of our industry-leading persistency, favorable mortality costs, and diligent expense management. The dividend scale and the underlying dividend interest rates are reviewed annually and are subject to change. Future dividends are not guaranteed.

³ The primary purpose of permanent life insurance is to provide a death benefit. Accessing cash value through loans or withdrawals will reduce the policy's cash value and death benefit, may cause the policy to lapse, and may result in a taxable event.

This publication is not intended as legal or tax advice. Financial Representatives do not render tax advice. Consult with a tax professional for tax advice that is specific to your situation.

Certified Financial Planner Board of Standards Center for Financial Planning, Inc. owns and licenses the certification marks CFP^®, CERTIFIED FINANCIAL PLANNER^®, and CFP^® (with plaque design) in the United States to Certified Financial Planner Board of Standards, Inc., which authorizes individuals who successfully complete the organization's initial and ongoing certification requirements to use the certification marks.