How much life insurance do you actually need? The DIME method gives a needs based answer: add up your Debt, Income replacement, Mortgage balance and children’s Education costs. It replaces guesswork and vague rules of thumb with four concrete buckets you can calculate in an afternoon. This guide walks through each letter with a worked hypothetical example. Educational content, not financial advice.
What the DIME method is
DIME is a formula for estimating the life insurance death benefit your family would need if you died tomorrow. Each letter is a category of financial need your survivors would face: D for debts other than the mortgage, I for the income you would no longer earn, M for the mortgage balance, and E for future education expenses. Add the four, subtract existing life insurance and liquid savings earmarked for the family, and you have a defensible coverage target.
Its strength is that it is needs based rather than income multiple based. A renter with no kids and no debt gets a small number; a mortgaged parent of three gets a large one, as it should be. Its weakness is that it is still an estimate, and the assumptions inside each letter deserve scrutiny, which we will get to.
D, Add up your debts (excluding the mortgage)
List every debt except the mortgage: car loans, student loans, credit card balances, personal loans. The mortgage gets its own letter because it is usually the largest single obligation and deserves separate treatment. Be honest here, include the store card you keep meaning to pay off. These are bills your family would either need to clear or keep servicing without your income.
I, Replace your income for the years it matters
Multiply your annual gross income by the number of years your family would depend on it, often until the youngest child finishes education or becomes independent. Some planners suggest 10 to 15 years as a starting frame; choose the horizon that fits your family’s ages. This is the biggest bucket for most earners, which is correct: lost earning power is the core risk life insurance exists to cover. If a spouse also earns, you may insure each income separately rather than doubling one policy.
M, Pay off the mortgage
Take the current mortgage balance, the payoff figure, not the original loan amount. Covering it lets your survivors stay in the home without the largest monthly bill. If you rent, this letter is zero, which is one reason renters’ DIME totals run lower. If you expect to downsize or the mortgage will be gone before the kids are grown, you can adjust, but most people keep the full balance for simplicity and safety margin.
E, Fund the kids’ education
Estimate future education costs per child. Use a realistic figure for the type of schooling you would want funded, the numbers below use a hypothetical $120,000 per child for illustration only; your target may be far higher or lower depending on public versus private plans and your country. Multiply by the number of children. This bucket is about preserving options your income would otherwise have paid for over time.
Putting DIME together: a worked hypothetical example
Meet a hypothetical two earner household insuring the higher earner. All figures are invented for illustration:
- D, Debts: car loan $12,000 + credit cards $6,000 = $18,000
- I, Income: $85,000 × 12 years = $1,020,000
- M, Mortgage: remaining balance $240,000
- E, Education: 2 children × $120,000 = $240,000
- DIME total: $18,000 + $1,020,000 + $240,000 + $240,000 = $1,518,000
Then subtract what is already in place: say $250,000 of employer group coverage and $50,000 in savings reserved for the family. The gap, about $1.2 million is the additional coverage to shop for. Round to the nearest sensible policy size and revisit the math after major life events. To run your own numbers, try an insurance needs calculator in our free tools hub.
What DIME misses
DIME is a starting point, not a complete plan. It does not value a stay at home parent’s unpaid labour, childcare, household management, which would cost real money to replace. It ignores inflation quietly eroding the income bucket over a decade plus horizon. It does not account for a surviving spouse’s own retirement shortfall, final expenses, or the fact that existing assets beyond the subtracted savings also offset need. And it says nothing about policy type: DIME estimates an amount, while the term versus permanent decision is separate (term usually matches DIME’s temporary need, kids grow up, mortgages amortise).
DIME vs the 10x income rule of thumb
The popular “10 times your income” shortcut would give our hypothetical earner $850,000, roughly $650,000 less than the DIME result. Rules of thumb are fast but blind to mortgages, kid counts and debts. DIME takes an hour and reflects your actual life. Use 10x as a sanity check, not a verdict; if the two disagree wildly, trust the one built from your real obligations.
A second worked example: a single parent with one child
The example in the sections above covers a two earner household. Now run the same method for a different shape of family, because DIME rewards honesty about your own numbers rather than copying someone else’s. Imagine a single parent earning $72,000 a year, with one child aged six, a mortgage, and a mix of smaller debts. Every figure here is hypothetical and chosen so you can follow the arithmetic yourself.
Start with D. The debts, excluding the mortgage, are a student loan of $15,000, a car loan of $7,000, and credit card balances of $2,000. Added together, that is $15,000 + $7,000 + $2,000 = $24,000. Notice how modest this bucket looks next to the others. That is normal: for most parents, debts are not the main reason to carry cover, lost income is.
Next, I. Because there is no second income in this household, the parent chooses a longer horizon: 15 years, until the child is 21 and through the most expensive years of education and early independence. The maths is $72,000 × 15 = $1,080,000. Compare that with the two earner example above, where 12 years was enough because a surviving partner would keep earning. The horizon is a judgement call, not a formula, and it is the single biggest lever in the whole calculation. Shortening it to 10 years would cut this bucket to $720,000 and the total by $360,000, which shows why picking the horizon carelessly matters more than rounding any other number.
M is the current mortgage payoff balance, $310,000 higher than in the first example, because this family bought more recently and has paid less of the balance down. If you are not sure what your own balance would buy you in monthly terms after a payoff, running the loan through a mortgage calculator helps you see the payment that would disappear, which is the real point of this bucket: a home the child can stay in, without the largest bill in the budget.
E is one child at a hypothetical $150,000 for education, so $150,000. The total is $24,000 + $1,080,000 + $310,000 + $150,000 = $1,564,000. Subtract what already exists, say $100,000 of employer group cover and $20,000 of savings genuinely set aside for the family, and the gap is $1,564,000 − $120,000 = $1,444,000, which most people would round to a $1.45 million policy. One parent, one child, and a total slightly higher than the two earner family above: the longer income horizon and the bigger mortgage outweigh having one fewer child to educate.
Three households compared side by side
Putting the examples together makes the pattern clearer than any single calculation. The renter in the last row is a third hypothetical case: an earner on $60,000 with $9,000 of debts, no mortgage, no children, and a 10 year income horizon chosen to support a younger sibling and a parent. The totals differ by nearly a million dollars, yet all three used exactly the same method.
| Household (hypothetical) | D, Debts | I, Income | M, Mortgage | E, Education | DIME total |
|---|---|---|---|---|---|
| Two earner couple, two children (example above) | $18,000 | $1,020,000 | $240,000 | $240,000 | $1,518,000 |
| Single parent, one child, 15 year horizon | $24,000 | $1,080,000 | $310,000 | $150,000 | $1,564,000 |
| Renter, no children, 10 year horizon | $9,000 | $600,000 | $0 | $0 | $609,000 |
Two lessons fall out of the table. First, income replacement dominates every total, so arguments about the exact education figure rarely change the answer much. Second, the method scales down as gracefully as it scales up: the renter is not told to buy a million dollars of cover by a formula designed for parents, because two of the four buckets are legitimately zero.
Common mistakes to avoid
- Counting the mortgage twice. If the mortgage sits inside your D list and again in M, you have inflated the total by the largest number in it. Keep consumer debts in D and the mortgage only in M.
- Using gross debts but net income, or the other way round. Pick one basis and stay consistent. The examples above use gross income throughout, which is the simpler and more conservative choice.
- Forgetting that debts shrink. A car loan with eight payments left does not need the same treatment as a fresh five year loan. If you are actively clearing balances, re run the D bucket after each payoff, a debt payoff calculator shows how quickly the bucket, and therefore the cover you need, can fall.
- Subtracting savings that are not really available. Retirement accounts you cannot touch without penalties, and money already promised to a house deposit, should not be deducted from the gap as if they were cash in hand.
- Insuring only the higher earner. A partner who earns less, or who does the unpaid childcare and housework, still has an economic value that would cost money to replace. Run a separate, smaller DIME for them instead of skipping them entirely.
- Setting the number once and never revisiting it. A payoff, a birth, a raise, or a child finishing school all move the total. A DIME figure from five years ago describes a household that may no longer exist.
A final habit worth copying from both examples: write the four numbers down, with the date, rather than keeping only the total. When something changes, you can update the one bucket that moved instead of starting again, and you can see, year by year, the cover you need gently falling as the mortgage amortises, the debts clear, and the children get older. That falling need is exactly what DIME is designed to show, and it is why a needs based figure beats a round number guess for almost every family.
Frequently asked questions
Why is the mortgage separate from other debts in DIME?
Because it is typically the largest single obligation and the one most tied to keeping the family’s housing stable. Separating it keeps the “D” bucket honest about consumer and auto debts rather than letting the mortgage swallow them.
Should both spouses carry coverage under DIME?
Usually yes, sized to each person’s economic contribution, including a stay at home parent’s replaceable labour. Run DIME separately for each spouse rather than insuring only the higher earner.
Does DIME tell me term or whole life?
No, DIME estimates how much, not what type. Because the needs it measures (childhood years, mortgage term) are temporary, term life insurance commonly fits; permanent policies solve different problems like estate liquidity.
How often should I recalculate DIME?
After every major life event: a birth, a home purchase or payoff, a big raise, a divorce, or a child finishing education. A quick annual review keeps the coverage aligned with the shrinking mortgage and growing savings.
Does DIME work for a single person with no kids?
In modified form. Income replacement and education drop out if nobody depends on you; the relevant needs become debts someone else might inherit, final expenses, and any support you provide to parents or others.