The DIME Method: A Back-of-Envelope Way to Size Life Insurance

Ask five people how much life insurance they need and you'll get five different answers, usually anchored to a marketing rule of thumb — "ten times your salary," someone's uncle once said — that has almost nothing to do with the shape of their actual household. The number that matters isn't a multiple of income. It's the sum of specific obligations that don't disappear just because the person who was covering them did. The DIME method is one way to build that sum from parts you can actually name, instead of a multiplier you can't defend.

What DIME stands for, and why the order matters

DIME is an acronym for four categories to size separately and then add together: Debt, Income replacement, Mortgage, and Education. The value isn't in the letters themselves — it's in the discipline of pricing out four distinct obligations instead of reaching for a single blended guess. Each category answers a different question about what a household would actually need to keep functioning, and treating them as one lump sum tends to hide the fact that some of these obligations are short and finite while others stretch for decades.

Say a household sits down and works through each letter with a pencil, rounding as they go — that's the whole exercise. It is not a substitute for a proper needs analysis, and it doesn't touch what the household already has in savings or existing coverage. It is a starting estimate, built to be corrected.

Debt: the balances that don't die with a mortality table

The D is for non-mortgage debt: car loans, credit card balances, personal loans, student loans that don't discharge on death (private loans, in many cases, do not). The logic here is simple — if income stops arriving, these balances don't pause, and a household that was already stretched thin servicing them monthly is in a much worse position trying to pay them off in a lump sum from a shrunken budget.

Imagine a household with an $18,000 car loan, $6,000 in credit card debt, and $12,000 remaining on a private student loan. That's $36,000 in obligations that have nothing to do with the roof over anyone's head — a category easy to undercount because none of it shows up on the mortgage statement.

Income replacement: the biggest, blurriest number in the formula

The I is the category that does the most work and invites the most disagreement, because it's really a proxy for "how many years does this household need help before it can stand on its own again." A common shorthand is some multiple of annual income — say, five to ten years' worth — but the honest version of this exercise asks a more specific question: how long until the surviving household's expenses drop (kids grow up, a mortgage gets paid off) or income rises (a spouse re-enters the workforce, a career advances) to the point that the gap closes on its own?

Take a hypothetical household earning $70,000 a year, with a plan to replace that income for eight years while a spouse completes a credential and re-enters full-time work. Eight times $70,000 is $560,000 — by far the largest single number in the DIME total, which is exactly why it deserves more scrutiny than a reflexive "ten times salary" answer. A household expecting a shorter bridge period, or one with two earners already, might reasonably use a smaller multiple.

Mortgage and education: the two line items people forget to size separately

The M is the payoff balance remaining on the mortgage — not the monthly payment, the balance — because DIME assumes the goal is to retire the debt outright rather than keep servicing it on a single income. A household with $240,000 left on its mortgage adds that figure directly.

The E is projected education costs for any children still years away from finishing school — again, an illustrative, self-chosen number rather than a quoted tuition figure, since actual costs vary enormously by the choices a family hasn't made yet. A household might pencil in $40,000 per child as a placeholder, acknowledging it could be higher or lower depending on the path each child takes.

Add the four pieces from this hypothetical household — $36,000 in debt, $560,000 in income replacement, $240,000 in mortgage payoff, and $80,000 in education for two children — and DIME lands at $916,000. That's the back-of-envelope figure, not a purchase order.

Where DIME breaks down

DIME's biggest limitation is that it only counts what's owed — it says nothing about what's already available to pay it. It ignores existing savings, investment accounts, existing coverage through an employer, and any survivor benefits a household might already be entitled to. Two households with an identical $916,000 DIME number could have wildly different actual needs if one has $300,000 in liquid savings and the other has none. Run the arithmetic, then subtract what's already on hand — that offset is often the difference between a number that looks alarming and one that's manageable.

DIME also treats every category as a fixed target, when in practice some of these numbers move over time — the mortgage balance shrinks every month, kids age out of the education line item, debt gets paid down. A DIME estimate calculated at 30 looks nothing like one calculated at 50, which is a good argument for treating this as a periodic exercise rather than a number set once and left alone.

The value of DIME isn't that it produces a precise, defensible figure — it's that it forces four separate conversations that a single "how much insurance do I need" guess tends to skip. Debt, income replacement, mortgage, and education are different kinds of obligations with different time horizons, and pricing them individually, even roughly, tells you more about your household's actual exposure than any marketing multiple ever will. Once you have that number, the harder and more useful question is: what have we already got that offsets it?