The insurance industry runs on a simple business model: sell people protection against risks the buyer overestimates, and let the underlying maths quietly favor the insurer. Every year, insurance companies pay out less than they collect, that's the whole business. On average, you lose. In exchange, you get protection against the specific scenarios that would financially destroy you.
That is the correct frame for every insurance decision. Insure catastrophic. Self-fund minor.
What you actually need
Health insurance. Mandatory or near-universal across most developed countries, and correctly so. A serious medical event can generate five- and six-figure costs even in systems with strong public healthcare. If you have any choice, make sure your coverage caps meaningful scenarios (surgery, hospital stays, chronic conditions) rather than optimising for tiny copays on GP visits.
Home insurance (if you own). A house burning down is the archetypal uninsurable-if-uninsured loss. Cheap and non-negotiable if you own the property.
Renter's / contents insurance (if you have valuables). Often $5: $15 a month. Covers theft, water damage, damage to a neighbor's property, and, in many policies, personal liability. If you own more than $5,000 of stuff or ever host guests in your apartment, worth it.
Car insurance. Third-party liability is mandatory almost everywhere and catastrophic without: injuring someone in an accident can produce claims into the hundreds of thousands. Full/collision coverage becomes optional once your car's value drops below roughly $5,000, at that point, the annual premium starts approaching the car's actual worth.
Life insurance (only if others depend on your income). If your death would financially derail your partner or children, term life insurance is one of the cheapest peace-of-mind purchases in personal finance. Term, not whole life. If nobody depends on your income, you don't need it, full stop.
Disability / income protection (often overlooked). The most under-purchased useful insurance. You are statistically far more likely to lose your income to disability than to die during your working years. If you're a freelancer or your employer doesn't provide it, worth serious consideration.
What you probably don't need
Extended warranties on appliances and electronics. The single most profitable product line at most electronics retailers. If the toaster breaks in year 3, you can afford another toaster. Insurers know this, that's exactly why the margin on extended warranties is enormous.
Phone insurance. Almost never mathematically justified. Premium plus deductible plus service fees typically exceed the depreciated value of the phone within 18 months. Exception: if a broken phone would trigger a genuine financial crisis, buy a cheaper phone instead.
Rental car insurance at the counter. Your existing car insurance and many credit cards already cover it. Read the disclosure once, save $25 a day forever.
Travel insurance for a $400 weekend trip. The math rarely works. Travel insurance makes sense for large, non-refundable trips (long-haul, expensive tours), not short domestic breaks.
ID theft protection. Overwhelmingly a marketing product. Freezing your credit is free in most jurisdictions and more effective than any subscription monitoring service. Real ID theft is resolved by the bank, not by the app.
Cancer-specific / disease-specific policies. Almost never worth it. Your general health insurance should cover the treatment. These add-ons pay out under narrow conditions and are priced against your fear, not the actuarial risk.
Whole life / investment-linked life insurance. Insurance and investing bundled together, usually with high fees on both sides. Almost always beaten by "buy cheap term life + invest the difference."
The deductible lever
For every insurance policy you keep, the deductible (what you pay before the insurer pays) is a lever most people ignore. Doubling your deductible often cuts your premium by 20-30%. If you have an emergency fund, you can absorb the higher deductible easily, and keep the annual saving.
Concretely: a home insurance policy with a $250 deductible costing $500/year vs the same policy with a $1,000 deductible costing $350/year. If you don't claim in most years, the higher deductible saves you $150 every year you don't claim, usually many years in a row.
Auto-renewal is the enemy
Insurers rely on inertia. Loyalty is punished in most markets: the customer who never shops around ends up paying materially more than a new customer for identical coverage. Once a year, spend 30 minutes comparing quotes for whatever policies you have. Switching often saves 10-30%. Do it on the same date every year so it doesn't slip.
The mental shift
Every policy you cancel is a monthly bill removed from your baseline, which improves your Freedom Days without cutting anything from your actual life. The $35/month extended-warranty bundle on your appliances is $420/year, which is roughly a week of essentials for the average household. Sold as protection, it's actually runway shrinkage.
You don't need to be under-insured. You need to be correctly insured. That usually means fewer, bigger, cheaper-per-dollar-of-coverage policies, and the emergency fund to self-insure everything else.