What Insurance Do You Really Need?
Evidence Grade: Strong -- Based on actuarial science and expected value mathematics.
This article is for educational purposes only and is not investment, tax, or financial advice. Do your own research or consult a qualified professional before making financial decisions.
Roughly two-thirds of personal bankruptcies involve medical bills (Himmelstein et al., 2019). One uninsured hospital stay can wipe out a decade of savings. Insurance is not a line item to minimize. It is a hedge against the losses that would actually break your financial plan.
The useful question is not “what insurance can I buy?” but “which risks should I keep, and which should I transfer?”
Definition: Insurance as Risk Transfer
Insurance is a risk-transfer contract. You pay a predictable premium, and a larger institution agrees to absorb an unpredictable loss on your behalf. The insurer pools many risks, prices the average, and profits on the spread. You gain certainty; the insurer monetises your tail risk.
The one principle that replaces a hundred sales pitches: insure catastrophes, self-insure inconveniences.
- Catastrophe — medical emergency, long-term disability, house fire, death of a breadwinner, a liability judgment. Transfer these.
- Inconvenience — a cracked phone screen, a broken appliance, a cancelled flight. Keep these and pocket the premium.
If an event would financially ruin you, insure it. If it would merely annoy you, skip the coverage.
When This Applies
The framework matters most when your exposures shift. Revisit coverage at these moments:
- Starting a family. Dependents create catastrophic life, disability, and health exposures that did not exist before.
- Buying a home. Your largest asset needs protection, and lenders require it.
- Changing jobs. Employer-provided disability and life coverage usually disappears between roles, often mid-transition.
- Net worth crossing roughly $500,000. Lawsuits scale with what you can lose, so umbrella liability enters the picture.
- Approaching retirement. Term life may no longer be necessary once dependents are self-supporting, but long-term care risk rises.
Review once a year anyway. What counts as catastrophic changes as your life does.
The Expected Value Framework
Every insurance decision reduces to one comparison:
- Expected cost of the event = probability x financial impact
- Cost of coverage = annual premium x years you would hold it
Insurers price premiums to profit on average, which means you will usually pay more in premiums than you receive in claims. That is rational for them and rational for you, but only when the uncovered loss would be catastrophic. For small-loss events, the math almost always favours self-insurance.
The deductible is the lever that tunes this. Higher deductibles absorb more small losses in exchange for lower premiums. With a funded emergency fund behind you, raising a health plan deductible from $500 to $2,500 can save $1,000 or more per year, and you come out ahead on any year without a major claim.
Essential Coverage for Most Adults
| Type | Who Needs It | How Much |
|---|---|---|
| Health | Everyone | At minimum, a high-deductible plan to cap worst-case exposure |
| Disability (long-term) | Anyone relying on earned income | 60 to 70% income replacement, own-occupation if possible |
| Term Life | Anyone with dependents | 10 to 15x annual income, level term covering the dependent years |
| Renters or Home | Everyone | Replacement cost of belongings plus liability |
| Auto | Car owners | Liability well above state minimums, comprehensive if car is valuable |
| Umbrella | Net worth ~$500k+ | $1 to 2M above auto and home liability |
Disability insurance is the most under-bought coverage on this list. You are roughly three to four times more likely to become disabled than to die during your working years, yet most people carry life insurance and no long-term disability. Your ability to earn income is your largest financial asset for most of your career. Protect it before you protect anything it buys.
Term vs Whole Life Insurance
Whole life insurance bundles a death benefit with a tax-deferred cash-value account and charges accordingly. Term life is the death benefit alone, for a fixed number of years.
For most households, term wins on the math. Twenty- or thirty-year level term typically costs five to ten times less than whole life for the same death benefit, and it covers the window when dependents actually need the payout. Investing the premium difference in low-cost index funds usually outperforms the cash value growth inside a whole life policy, especially once fees and surrender charges are included.
Whole life earns its keep in a narrow set of cases: large estates facing estate tax, special-needs planning, or buy-sell agreements for business owners. Outside those, term is the default.
How to Lower Premiums Without Losing Protection
- Raise deductibles to the ceiling of your emergency fund. You are already self-insuring the small stuff, so stop paying an insurer to do it for you.
- Bundle auto and home with one carrier. Typical savings run 10 to 25%.
- Re-shop every one to two years. Insurers raise renewal rates on existing customers and discount new ones. Loyalty is not rewarded; quotes are.
- Pick term over whole life unless you are in one of the narrow cases above.
- Mind liability limits, not just premiums. Cheap liability coverage is expensive the one time it matters.
Insurance You Probably Do Not Need
- Extended warranties on electronics (retailer margins run 40 to 80%)
- Flight and trip insurance for short domestic trips
- Credit card protection plans and credit life insurance
- Rental car damage waivers when your auto policy already covers rentals
- Life insurance when no one depends on your income
- Disease-specific policies (cancer, critical illness) on top of solid health coverage
- Pet insurance for routine care (only consider it for catastrophic vet bills)
- Identity theft plans (free credit freezes do most of the work)
If a policy exists, someone has priced it to profit on average. For small losses, the math favours self-insurance every time.
Practical Steps
- Audit your current coverage. Most people carry gaps (disability, umbrella) and waste (warranties, credit insurance) simultaneously.
- Fund the emergency fund first. It is what lets you raise deductibles and drop the small-loss policies. See Build Emergency Fund.
- Run the expected-value check on every policy. Probability times impact versus annual premium. If the math fails, drop it.
- Review once a year and at every life transition. Coverage needs drift; policies do not update themselves.
- Read the policy before you need it. Know your deductibles, limits, and exclusions while you have time to change them.
Related
- Protocol: Build Emergency Fund (the cash buffer that lets you raise deductibles and self-insure smaller losses)
- Concept: Cash Flow Principle (premiums are a fixed line item; size them against real catastrophic risk, not fear)
- Concept: Human Capital (disability insurance protects the largest asset most adults will ever own)
- Concept: Smart Risks Without Ruin (insurance is one tool inside a broader ruin-avoidance framework)
- Domain: IV. Wealth (the broader wealth domain map)