Life insurance is the financial safety net that protects your dependents if you die prematurely. Determining how much coverage you need requires analyzing what your income and financial resources currently provide and estimating what would be needed to maintain your family's standard of living without you. The sections below walk through the industry-standard DIME method for sizing coverage, the term-versus-permanent decision, and the factors that move premiums most.
Sizing Coverage with the DIME Method
The most widely used framework among US financial planners is the DIME method: Debt (excluding mortgage) + Income replacement + Mortgage + Education. Add up all outstanding non-mortgage debts (credit cards, auto loans, student loans, personal loans), calculate income replacement by multiplying annual income by the number of years you want to replace it (typically 10–20 years, adjusted for inflation in larger models), add the remaining mortgage balance so your survivors can stay in the home, and estimate future education costs for children at $30,000–$80,000 each depending on college tier. The sum gives you a solid coverage target. Then subtract existing life insurance coverage and liquid assets (checking, savings, non-retirement brokerage) to find the true gap. A useful quick check: 10–12× your annual income usually produces a similar number to a full DIME calculation for families with young children. For families with adult children and substantial retirement savings, the DIME number may actually be lower than the 10× rule of thumb because education and years-of-income-replacement both shrink.
Term vs Permanent Insurance
Term life insurance is almost always the correct product for pure income-replacement purposes, and for the large majority of buyers it is the only life insurance they need. A 20-year term policy with a $1 million death benefit typically costs $30–$60 per month for a healthy non-smoking 35-year-old, and the same policy for a 45-year-old runs $65–$110 per month. Term is pure protection with no savings component, which is why it is so inexpensive. Whole life and universal life combine insurance with a cash-value investment component, which makes them 5–15× more expensive for the same death benefit. They are typically appropriate only for specific estate-planning situations (when estate tax is a concern and the policy is held inside an irrevocable trust), business-succession funding for small-business owners, or families with a lifelong dependent like a child with severe disabilities who will never be financially independent. For everyone else, the textbook advice from fee-only financial planners is "buy term and invest the difference" — the premium savings invested in a low-cost index fund typically outperform the cash value growth of a whole-life policy over any 20+ year window.
What Moves Your Premium
Age is the single largest driver of life insurance premiums, and locking in a policy while young and healthy is the highest-ROI insurance decision most people can make. Rates roughly double every 10 years of age, so the same $1 million 20-year term that costs a 30-year-old about $30/month costs a 50-year-old about $120/month. Health class matters nearly as much: insurers typically use four main tiers (Preferred Plus, Preferred, Standard, Substandard) based on a medical exam, lab work, and family history, and Preferred Plus rates can be 30–40% lower than Standard. Smokers pay 2–3× non-smoker rates, and smoking declarations are checked against the lab panel every applicant completes — nicotine metabolites show up even in casual users. Gender affects rates by roughly 15–20% (women pay less because of longer life expectancy). Occupation and dangerous hobbies (private piloting, scuba, skydiving) add rated surcharges. Finally, your life-insurance needs are not static. They typically decline over time as the mortgage amortizes, children become financially independent, and retirement assets accumulate. Review coverage every 5 years or after major life events, and consider policy laddering so you can shed excess coverage as needs decrease without re-underwriting at older ages.