How Much Life Insurance Do You Actually Need?

Nearly every life insurance calculator opens with the same shortcut: take your salary and multiply it by ten. It is a comfortable number because it requires no thought, and it is wrong for most people who use it, in both directions.

Consider two households earning the same $80,000. One has a $300,000 mortgage, a four-year-old and a partner working part time. The other has no mortgage, adult children and a partner earning the same salary. The 10x rule hands both of them $800,000. The first family is underinsured and the second is paying premiums for a payout nobody needs, because the rule only looks at income, and income is the input that tells you the least.

What the shortcuts actually measure

There are three common ways to size a policy, and they differ mainly in how much of your real situation they are willing to look at.

Method	How it works	Where it breaks
Multiple of income	Annual salary multiplied by a fixed figure, usually 10 to 12	Ignores debt, ignores a second income, and ignores whether anyone still depends on you
DIME	Add Debt, Income replacement, Mortgage and Education, then insure the total	Better, but double counts the mortgage if it is already inside your debt figure and ignores assets you already hold
Capital needs analysis	Total everything your death would cost the household, subtract everything already in place, insure the gap	Takes half an hour and requires honest numbers, which is why calculators avoid it

Only the third produces a number specific to you, and the arithmetic is addition and subtraction, not modelling.

Build the number from what actually stops

Work through five lines. Write down real figures rather than approximations, because the whole point is to avoid guessing.

One: debts that would not disappear. Mortgage balance, car finance, credit cards, personal loans, any business debt you have personally guaranteed. Student loan treatment varies: US federal student loans are discharged on death, private loans frequently are not, so check yours.

Two: the income gap, not the income. This is where most people overshoot. You are not replacing your entire salary, only the part of it the household would still need. Subtract what you personally consume, subtract taxes you would no longer pay, and subtract what a surviving partner earns or would earn. Multiply the remaining annual gap by the years it needs to last, usually until the youngest child finishes education or the surviving partner reaches pension age, whichever is longer.

Three: costs that only appear because you are gone. Childcare is the big one. A partner who was sharing school runs and sick days now has to buy that coverage or cut their hours, and either choice costs money. Add funeral and estate administration costs, which run into four figures in all three countries.

Four: education. If putting children through university or college is part of the plan, put a figure on it. It is the large future cost people reliably remember and then forget to insure.

Five: what already exists. Savings, investments outside locked retirement accounts, employer group life, any existing policy, and the state benefits below. Subtract the lot.

Whatever is left over is what you actually need to buy.

A worked example

Sam is 38, earns $78,000, and has a partner earning $42,000 and two children aged four and seven.

Line	Amount
Mortgage balance	$240,000
Car loan and credit cards	$18,000
Funeral and estate costs	$12,000
Income gap: $40,000 a year for 14 years, discounted for investment growth	$500,000
Education fund for two children	$80,000
Total need	$850,000
Less employer group life (1x salary)	-$78,000
Less accessible savings and investments	-$45,000
Gap to insure	$727,000

Sam buys $750,000 of 20-year term, rounding up to the next standard band because the price difference is small and the term runs past the younger child's twenty-second birthday.

Two details are worth pulling out. The income gap is $40,000 a year, not Sam's $78,000 salary, because the partner keeps earning and Sam is no longer spending. And $500,000 is lower than fourteen years multiplied by $40,000, which is $560,000, because a lump sum invested conservatively earns something while it is drawn down. Those two adjustments are the difference between a realistic number and a frightening one.

Notice what is missing: any deduction for survivor benefits. Those shrink the annual gap rather than the lump sum, and their size depends heavily on where you live.

What the state already pays, and how wildly it varies

This is the section most articles skip, and it is the single biggest reason the same family needs different amounts of cover in different countries.

United States. Social Security survivor benefits are substantial and ongoing, which materially reduces the income replacement line. A surviving spouse at full retirement age can receive 100 percent of the deceased worker's benefit, and one aged 60 up to full retirement age between 71.5 and 99 percent. Children generally receive 75 percent. Crucially, a family maximum applies, typically 150 to 180 percent of the worker's full benefit, so a large family does not simply multiply up. There is also a one-time lump sum death payment of $255, more historical curiosity than help. Check your own figures in your my Social Security account, because the amount depends on your earnings record. On tax, IRS guidance is that proceeds paid to a beneficiary because of the insured person's death are generally not includable in gross income, though interest paid on top is taxable.

United Kingdom. The safety net is far thinner. Bereavement Support Payment pays a one-off £3,500 plus 18 monthly payments of £350 at the higher rate, which applies if you were pregnant or receiving Child Benefit when your partner died. The lower rate is £2,500 plus 18 monthly payments of £100. That is time-limited support, not income replacement, so UK households need to insure a larger share of the gap themselves. The bigger planning point is Inheritance Tax: the nil rate band is £325,000, the standard rate above it is 40 percent, and passing a home to children or grandchildren can lift the threshold to £500,000. Anything left to a spouse or civil partner is exempt. A payout that lands inside your estate can push it over the line and be taxed at 40 percent, which is why UK policies are so often written in trust, so the money goes straight to the beneficiaries outside the estate.

Canada. The CPP death benefit is a one-time lump sum of $2,500, topped up to $5,000 for deaths on or after 1 January 2025 where the contributor never drew a CPP or QPP retirement or disability pension and left no surviving spouse eligible for a survivor's pension. Either way it covers part of a funeral, not a mortgage. The ongoing CPP survivor's pension and children's benefit help more, but depend on contribution history. Canada has no estate or inheritance tax, so the payout is not taxed, but there is a deemed disposition of capital property at death and RRSP or RRIF balances are generally brought into income on the final return unless they roll to a spouse. For families holding a cottage, rental property or a business, that final tax bill is often the reason permanent cover gets bought at all.

The right number changes, so plan for that

Your need peaks in your thirties or early forties, when the mortgage is largest and the children are youngest, then declines as the balance falls and the children approach independence.

Two sensible responses. Buy a level term policy sized to the peak and accept that it is generous later, which is simplest and often cheap enough not to matter. Or ladder it: two or three policies with different end dates, so cover steps down as your need does. A $750,000 requirement might become a $250,000 30-year policy plus a $500,000 15-year policy, the second expiring around the time the younger child leaves education. Laddering costs less overall but you have to track the expiry dates.

Whichever shape you choose, the product decision sits downstream of the amount. If you are still weighing the type of policy rather than the size, our guide to term vs whole life insurance covers that trade-off.

Four mistakes that quietly break the number

Insuring only the earner. A household with one salary and one stay-at-home parent has two insurable people, because the unpaid work has a market price the survivor will have to pay.

Treating group cover as the plan. Employer life insurance is usually one to four times salary and it ends when the job does. Own the core of your cover personally.

Assuming the surviving partner keeps working exactly as before. In practice, hours drop for a year or more. Build that into the income gap rather than pretending it away.

Never revisiting it. A new mortgage, a new child, a divorce or a paid-off house each change the answer. Re-run the five lines every few years, and check the beneficiary designation while you are there. A policy paying out to an ex-spouse because nobody updated a form is the most avoidable failure in the whole system.

The bottom line

Do not buy a multiple, buy a gap. Total the debts that survive you, the years of income your household actually needs replaced, the childcare and education costs, and the cost of dying, then subtract the savings, the employer cover and the state support you can realistically count on. What is left is the policy. It takes about half an hour, and it is the difference between a number that means something and one from a calculator that never asked how many children you have.