$120K Salary, $425K Mortgage, Three Kids: How the DIME Method Calculates a $1.9M Life Insurance Need
You have three kids, a $425K mortgage, and a $120K salary. How much life insurance do you actually need?
If you asked five different insurance agents this question, you'd get five different answers — and probably five different products pitched. That's not because the math is hard. It's because most of the people answering the question have a financial incentive to answer it a certain way.
The math itself isn't opaque. It's called the DIME method — Debt, Income, Mortgage, Education — and it's the same framework fee-only planners use because it doesn't care what you buy afterward. It just tells you the number. Let's run it for a specific family so you can see exactly how the pieces stack, and then you can swap in your own numbers.
The family: $120K salary, $425K mortgage, three kids under 10
Here's our example household:
- Primary earner income: $120,000/year
- Mortgage balance: $425,000
- Other debt: $20,000 auto loan + $10,000 credit cards = $30,000
- Final expenses (funeral, estate settlement, medical bills): $15,000
- Kids: three, ages 1, 4, and 7 — youngest needs support for roughly 20 more years
- Existing coverage: a $180,000 group policy through the employer (1.5x salary, standard default)
Now let's build the number D-I-M-E component by component.
D — Debt and final expenses
This is the easy part: add up everything that isn't the mortgage, plus what it costs to bury someone and settle an estate.
$30,000 (auto + credit cards) + $15,000 (final expenses) = $45,000
M — Mortgage payoff
Whatever's left on the mortgage, in full. No partial credit for "well, someone could refinance."
$425,000
E — Education
Three kids, each needing roughly $110,000 for a four-year in-state degree by the time they enroll (this accounts for tuition inflation running ahead of general inflation — a real number, not a guess, and one every parent should sanity-check against their own state's projected costs).
3 × $110,000 = $330,000
I — Income replacement (the part everyone gets wrong)
This is where most online calculators either oversimplify ("10x your salary!") or overcomplicate into something unusable. Here's the honest version.
The surviving spouse doesn't need to replace 100% of the deceased's income — one person's share of household expenses (food, gas, personal spending) disappears too. Most planners use 70–75% of gross income as the replacement target. We'll use 75%.
$120,000 × 0.75 = $90,000/year needed
Now, that $90,000 doesn't need to sit in cash — it gets invested and drawn down over the 20 years until the youngest child is financially independent. So we calculate the present value of a 20-year income stream, assuming the invested death benefit earns a conservative 5% real return:
PV = payment × [1 − (1 + r)⁻ⁿ] / r PV = $90,000 × [1 − (1.05)⁻²⁰] / 0.05 PV = $90,000 × 12.46 PV ≈ $1,121,580
That 5% assumption matters more than most people realize. The recent Weekend Reading roundup from Kitces flagged that financial planning clients are increasingly anxious about rising costs, with healthcare expenses topping the list. If you discount at an optimistic 7% instead of 5% to make the number smaller and the premium cheaper, you're betting your family's healthcare and living costs won't outpace your assumptions for two decades. That's not a bet most fee-only planners recommend making with your family's only safety net.
Adding it up
| Component | Amount |
|---|---|
| D — Debt & final expenses | $45,000 |
| I — Income replacement (PV, 20 yrs @ 5%) | $1,121,580 |
| M — Mortgage payoff | $425,000 |
| E — Education (3 kids) | $330,000 |
| DIME total need | $1,921,580 |
Round it and you get $1.9 million — not the $500K "round number" an agent might suggest, and not the $1M "everyone buys $1M" default either. It's specific to this family's debt, income, and dependents.
This is the kind of analysis Morivex runs for you — so you don't have to build the spreadsheet yourself.
The gap nobody checks: employer coverage vs. actual need
This family has a $180,000 group life policy through work — standard 1.5x salary coverage, the kind almost every employer defaults to. Here's what that actually covers against the $1.92M need:
| Amount | |
|---|---|
| DIME-calculated need | $1,921,580 |
| Employer group coverage | $180,000 |
| Coverage gap | $1,741,580 |
That's not a rounding error. That's a family that believes it has "life insurance through work" while carrying 91% of its actual need uncovered. This is one of the most common blind spots in coverage planning — employer policies create a false sense of adequacy precisely because they're automatic and require no decision-making. If you've never run your own DIME number, there's a good chance you're sitting on a version of this same gap. Similar math shows up in families with different incomes and debt levels — see this $95K salary, $380K mortgage breakdown and this $105K salary, $360K mortgage comparison for how the numbers shift with different inputs.
Your coverage need isn't static — it declines every year
Here's the question that trips up most people once they've bought a policy and stopped thinking about it: do you need $1.9M in coverage when your kids are 25 as much as when they're 1?
No. And this is where a flat, one-size-fits-all policy stops matching reality. Run the same DIME calculation for this family 10 years from now, when the youngest is 11:
- Mortgage principal paid down: roughly $340,000 remaining (was $425,000)
- Income replacement years remaining: 10, not 20 → PV factor drops from 12.46 to 7.72 → I component falls to about $694,800
- Education: two of three kids may already be through college, cutting that component substantially
- Debt: likely lower as the auto loan and credit cards get paid off
The recalculated need at year 10 could easily be under $1.1M — nearly 45% lower than today's $1.9M. Buying a single flat $1.9M policy for 30 years means you're paying level premiums on coverage you'll be meaningfully over-insured for by year 15. This is exactly the logic behind laddering — buying several term policies of different lengths (say, a 10-year, a 20-year, and a 30-year policy) that expire as your need shrinks, instead of one large policy sized for year one and held flat for three decades. One worked example shows three laddered term policies saving a similar family over $11,000 versus a single policy over 30 years, for the same peace of mind in the early years.
You can model this for your specific situation at Morivex — plugging in your own income, mortgage balance, and kids' ages instead of trying to eyeball a declining curve.
Term vs. whole life: does the product choice change the number?
The DIME calculation tells you how much coverage you need. It says nothing about which product delivers it — and that's a separate decision with its own math. For this family's $1.9M need, term life priced for a healthy 35-year-old runs a fraction of the premium a comparable amount of whole life would cost, because whole life bundles in a savings/cash-value component that term doesn't. If you're trying to reconcile "I need $1.9M in coverage" with "whole life premiums feel unaffordable at that amount," a detailed $1M term vs. whole life vs. universal life comparison over 30 years walks through where each product actually earns its cost — and where it doesn't.
Why the carrier behind the policy matters more than people assume
There's a detail that gets skipped in most coverage conversations: you're not just buying a number, you're buying a multi-decade promise from a company to pay that number out to your family long after you're gone. The health of the insurance industry actually matters here. A.M. Best recently reported that U.S. mutual property/casualty insurers doubled their net income in 2025, to about $42.6 billion, with underwriting income swinging from a $7.2 billion loss in 2024 to a $14.8 billion gain in 2025 — a meaningful strengthening of the sector's claims-paying capacity industrywide. That's encouraging context, but it's not a substitute for checking the specific carrier's own AM Best rating before you sign. A financially strong industry average doesn't guarantee every individual company behind your policy is equally solid three decades from now. If you're weighing carrier strength alongside underwriting speed and cost, this breakdown of how AM Best ratings factor into the buying decision is worth a look before you commit.
The number that matters is yours, not this family's
$1.9 million is what the math produces for this specific family — this income, this mortgage, these three kids, this discount rate assumption. Change any one input and the number moves meaningfully: a $90K salary instead of $120K, a $350K mortgage instead of $425K, two kids instead of three — every variable shifts the DIME total, sometimes by hundreds of thousands of dollars.
That's exactly why generic online calculators that spit out "10x your salary" fail families. They skip the debt, they skip education costs, they skip the present-value discounting on income replacement, and they definitely don't account for the fact that your need shrinks every year your mortgage gets smaller and your kids get older.
Run your own numbers — your actual mortgage balance, your actual income, your actual kids' ages — at Morivex. It takes the same DIME framework used here and builds the calculation around your household instead of a hypothetical one. If it's been more than a year since you checked, or if you've never checked at all, this is the moment to do it — before another year passes with a $1.7 million-sized gap between what you have and what your family actually needs.
Sources
- AM Best: US Mutual Insurers Doubled Net Income in 2025 — Insurance Journal
- This Tahoe Hotel Got a Glow-Up, but Missed a Few Spots — NerdWallet
- National Coffee Day: Where to Find Free Coffee and Deals on Sept. 29 — NerdWallet
- Weekend Reading For Financial Planners (September 26–27) — Kitces Nerd's Eye View
- Minnesota Settles Over Fraudulent Claims for Child Nutrition Funds — Insurance Journal