Term life vs whole life: what the math actually says

If you have anyone financially dependent on you — a spouse, children, an aging parent — life insurance moves from optional to essential. The harder question is which kind, and the answer is almost always term, despite what most life insurance salespeople will tell you.

What term life is

Term life insurance pays a fixed death benefit if you die during the term — typically 10, 20, or 30 years — in exchange for a fixed annual premium. If you outlive the term, the policy ends. Nothing builds up. Nothing comes back.

It's the simplest possible insurance contract: cash if you die, nothing if you don't.

Premiums depend on age, health, smoking status, and the term length. A healthy 35-year-old non-smoker can typically get a $1 million, 20-year term policy for around $30-50 a month. The premium is locked in for the full term.

What whole life is

Whole life (sometimes "permanent" or "universal" life) covers you for your entire lifetime, with a death benefit guaranteed at any age. Premiums are much higher than term — typically 8-15× — and a portion goes into a "cash value" account that grows over time at a slow, contractually defined rate.

The cash value is the selling point. It's pitched as "insurance plus a savings account" or, more recently, as a way to build tax-advantaged wealth.

Why the math usually favors term

Compare $50/month term vs $500/month whole life for a 35-year-old. The whole-life buyer pays $450 more per month — but only a small share of that is going into the cash-value account.

If the same $450/month went into a low-cost index fund earning 7% real returns for 30 years, the final balance would be approximately $546,000. The cash value of a whole-life policy over the same period, at the typical 3-4% guaranteed growth, would be in the $200-280K range — and that's before considering the front-loaded surrender charges in the first decade.

This is the core of the "buy term and invest the difference" argument. You get equivalent or better insurance coverage for far less, and the savings goes into a vehicle (an index fund in a tax-advantaged account) with higher expected returns.

Where whole life can make sense

The honest answer: in a few narrow situations.

• Estate planning at high net worth. When you're over the federal estate-tax exemption ($13.6M+ in 2026) and need life insurance to fund estate taxes for heirs, the permanence matters and the policy is held inside an irrevocable life insurance trust.
• Lifelong dependents. A child with a disability who will need financial support indefinitely is a permanent need, not a term-bounded one.
• High earners who max every other tax-advantaged account. Whole life adds a small tax-advantaged shelter on top of maxed 401(k), IRA, HSA, and 529 contributions. The opportunity cost is real but smaller than for someone who hasn't.

For roughly 95% of households, none of these apply.

What "cash value" really costs

The cash-value account isn't free money. The slow growth rate is partly because the insurer is paying for the death benefit out of your premium, and partly because of administrative costs. In most policies, the first 1-2 years of cash-value contributions are entirely consumed by fees — the "surrender value" stays at zero until those costs are recovered.

If you cancel a whole-life policy in year 5 or 10, you'll typically recover far less than you paid in. The contract is designed to make exit expensive.

How much term to buy

A common rule: 10-12 times your annual income for the primary earner, or enough to replace your income through your kids' college years, whichever is higher.

Term length should match the period of dependency. If your youngest child will be 22 in 18 years, a 20-year term covers them through college. If you have a 30-year mortgage you'd want paid off in case of your death, a 30-year term matches.

The clean recommendation

For most readers: a 20- or 30-year level-term policy from a top-rated insurer, in an amount that protects your dependents through their financial vulnerability. Invest the premium savings in a tax-advantaged account. Revisit coverage every 5 years and after major life events.