The “10x your salary” rule is easy to remember and frequently wrong, because it ignores how much you owe, how many years of income your family actually needs, and what you already have. A better approach adds up the obligations and subtracts the resources already in place. This guide walks through that calculation, shows where each input comes from, and covers the cases the formula handles badly.
Start with what the policy has to cover
The DIME method breaks the need into four parts:
- D — Debt: mortgage balance, car loans, student loans, credit card balances, and any co-signed obligations you would not want passed to family.
- I — Income: the annual income you would replace, multiplied by the number of years it must be replaced.
- M — Mortgage: sometimes counted separately from debt so the housing figure is not double-counted or missed; if your mortgage is already in “D,” do not add it again.
- E — Education: projected cost of schooling for each child, at today’s prices or inflated if you want to be conservative.
Then subtract what already exists: savings, investments, existing life cover (including employer group cover), and any survivor benefits.
A worked example
Take a household with a $240,000 mortgage, $25,000 in car and student loans, a $65,000 income they would want replaced for 15 years until the youngest child finishes school, and two children with an estimated $60,000 total education gap after savings.
- Debt: $240,000 + $25,000 = $265,000
- Income: $65,000 × 15 = $975,000
- Education: $60,000
- Gross need: $1,300,000
- Less existing savings and employer cover of, say, $150,000
- Shortfall: about $1,150,000
Note how far this is from “10× salary” — which would have suggested $650,000, leaving the family roughly half a million short. This is the single biggest weakness of the salary multiple: it scales with what you earn, not with what your family needs.
Run your own numbers with the Life Insurance Needs Calculator, or compare term structures with the Term Life Insurance Calculator.
Choosing the term length
Match the term to the obligation, not to a round number. If your youngest child is 4 and you want cover through university, that is roughly 18–20 years. If the mortgage has 25 years left and it is the dominant need, a 25- or 30-year term is the logical match. A 10-year policy is usually cheapest per year but leaves a gap if your obligations run longer, and renewing at that point means buying cover at an older, more expensive age — and possibly with a health screening you no longer pass.
A structure many people find efficient is laddering: two policies that expire at different times. A larger 20-year policy covers the years when children are fully dependent, and a smaller 30-year policy handles the mortgage and final expenses. As each layer expires, the premium drops without leaving a sudden hole.
Where the calculation misses
Inflation. Replacing $65,000 of income for 15 years in nominal terms underestimates the need, since the cost of everything rises. Either inflate the income figure or accept that the later years are under-covered.
One-earner households with unpaid work. If one parent provides childcare, the surviving family must now pay for that care, plus possibly lose income from reduced working hours. This is a real cost that the income-replacement line does not capture, and it routinely runs into five figures a year.
Business obligations and estates. Key-person cover, buy-sell agreements and potential estate tax exposure sit outside a family needs analysis entirely. If you own a business with a partner, this needs its own calculation.
Term versus whole life
Term insurance buys pure protection for a fixed period and costs far less per dollar of coverage; most households are better served by buying more term and investing the difference. Whole and universal life bundle a savings component, cost several times more for the same death benefit, and make sense mainly for estate planning, lifelong dependants, or when you have already maxed out tax-advantaged accounts. You can model the trade-off with the Term vs Whole Life Calculator.
What happens when the term ends
A term policy pays nothing if you outlive it, which surprises people who assumed the premiums were building something. That is the trade-off for the low cost: you were buying protection for a specific window, and when the window closes the cover stops.
Many policies include a conversion option that lets you exchange some or all of the term coverage for a permanent policy without a new medical exam, usually within a set window and before a certain age. This matters if your health changes during the term: converting locks in insurability at the rates you already qualified for, which can be the difference between having cover and being uninsurable later.
Automatic renewal is different and usually poor value. Many term policies renew annually after the initial term at steeply increasing rates, because you are now older and the risk is higher. If your policy has this feature, diarise the renewal date rather than letting it roll — and ideally arrange cover so that the term ends after your obligations do, making renewal unnecessary.
A practical habit is to re-run the needs calculation every few years, or after any major change — a new mortgage, a new child, a child leaving home, a jump in income, or paying off a loan. The right amount of cover falls as your dependants become independent and your savings grow, which is why a single large 30-year policy is not always better than a laddered structure that shrinks over time.
Key Takeaways
Size term life by adding debt + income replacement + education, then subtracting savings and existing cover — not by multiplying your salary. In the worked example the proper figure was roughly $1.15M against a $650,000 salary-rule estimate. Match the term length to your longest obligation, consider laddering two policies, and add explicit amounts for childcare and inflation, which the basic formula omits.