If you ask most people how much life insurance they need, you'll hear a confident answer: "ten times your salary." It's the rule that shows up in every personal finance book, and it's almost always wrong. A 28-year-old software engineer with no kids and $30,000 in student loans does not need the same coverage as a 38-year-old parent of three with a $500,000 mortgage and a spouse who stays home. The 10x rule is a marketing shortcut, not a plan.
The right way to size life insurance is to actually sit down and ask what would happen financially to the people who depend on you if your income disappeared tomorrow. That calculation has a name—the DIME method—and once you understand it, you'll never go back to a multiplier rule.
Why the "10x income" rule fails real families
The 10x rule has two problems. First, it ignores your existing obligations—mortgage, debts, and the future cost of raising kids and putting them through school. Second, it ignores assets you already have—savings, retirement accounts, and existing insurance through work. A family with $400,000 in investments and a $200,000 mortgage needs very different coverage from a family with the same income but $0 in assets and a $600,000 mortgage.
The 10x rule also assumes your survivors will spend down the death benefit conservatively. If they invest it and withdraw 4% per year, $1,000,000 of coverage replaces about $40,000 of annual income forever. That sounds like a lot until you realize that replacing a $120,000 salary with $40,000 is a 67% pay cut for your family.
The DIME method: a real framework
DIME stands for Debt, Income, Mortgage, Education. It's a four-part calculation that captures what your family actually needs. Here's how each piece works.
D — Debt
Add up all debts that wouldn't be wiped out by your death. Student loans are forgiven at death for federal loans and most private loans, but credit cards, personal loans, car loans, and business debts your spouse co-signed are not. Include also any taxes owed. A typical household might have $15,000 in credit card debt, $25,000 on a car, and $10,000 in personal loans—totaling $50,000 in debt to be paid off.
I — Income replacement
This is the biggest piece. Estimate how many years of income your family would need and multiply by your after-tax annual income. For most parents with young children, that's 15–20 years—until the kids are through college and the surviving spouse has rebuilt their earning power. A common shortcut is to calculate the present value of your future earnings.
For example, if you earn $100,000 after tax, want to replace income for 20 years, and assume your survivors can earn 5% on the death benefit, the present value is roughly $1.25 million. That's the lump sum that, invested at 5%, would generate $100,000 per year for 20 years before running dry. Notice this is more than 10x income—a real income replacement calculation usually lands between 12x and 20x for parents of young kids.
M — Mortgage payoff
Pay off the mortgage so your family can stay in the house. Use the outstanding principal balance, not the original loan amount. A $500,000 mortgage with 25 years remaining might only have $420,000 outstanding—insure the $420,000.
E — Education
Estimate the future cost of putting each child through college. For a child born today, four years at an in-state public university will likely cost $130,000–$180,000 by the time they enroll; a private university could run $300,000–$450,000. Multiply per child and add it to your total.
Putting DIME together: a worked example
Let's size coverage for a real family. Meet the Patels: Aarav is 36, earns $140,000 as a project manager. His wife Priya is 34, stays home with their two kids (ages 4 and 6), and the household has these numbers:
- Debt: $18,000 in credit cards, $22,000 car loan, $10,000 personal loan = $50,000
- Income replacement: 18 years × $110,000 after-tax income, discounted at 4% = ~$1.4 million
- Mortgage: $380,000 outstanding on a $450,000 home
- Education: 2 kids × $150,000 each = $300,000
- Final expenses: $25,000 (funeral, probate, emergency buffer)
Total need: $50,000 + $1,400,000 + $380,000 + $300,000 + $25,000 = $2,155,000
Now subtract what they already have. Aarav has $210,000 in his 401(k), $50,000 in savings, and $210,000 of life insurance through work. That's $470,000 of existing assets. The gap is roughly $1.7 million—and that's how much individual life insurance Aarav should buy on Priya's behalf (and Priya, even as a stay-at-home parent, needs her own coverage to replace the $50,000–$70,000 per year it would cost to hire childcare, housekeeping, and tutoring if she died).
This is the power of DIME: the answer is not a multiple of income, it's the actual gap between what your family would need and what they'd have.
Term vs. whole life: pick term, almost always
Once you know how much coverage you need, the next decision is term or whole life. Term insurance pays out only if you die during a set period (10, 20, or 30 years) and is inexpensive—about $25–$60 per month for a healthy 35-year-old buying $1 million of 20-year term. Whole life covers you for your entire life, builds cash value, and costs 5–15x more for the same death benefit.
For 95% of families, term is the right answer. The reason is simple: you need the most coverage when your kids are young and your mortgage is large. By the time you're 60, the kids are grown, the mortgage is paid off, and your retirement accounts have grown to the point where you're self-insured. The "buy term and invest the difference" approach leaves most families far wealthier than buying whole life.
Whole life makes sense in narrow cases: high-net-worth individuals who want to fund a trust for estate tax liquidity, business owners funding buy-sell agreements, and parents of children with lifelong special needs. If you don't fit one of those profiles, term is almost certainly better.
How long should the term last?
Match the term to the date your dependents become financially independent. For new parents, that's typically 20–25 years—the time until the youngest child finishes college and the mortgage is paid down. A 30-year term gives extra buffer for late-in-life parents or those who refinance into a longer mortgage.
The layering trick
Instead of buying one big 30-year policy, consider layering. Buy a $1 million 20-year policy plus a $500,000 10-year policy. Total coverage starts at $1.5 million while the kids are young and your mortgage is large. In 10 years, when the smaller policy expires, you'll be at $1 million. In 20 years, both expire—but by then the mortgage is mostly paid, the kids are launched, and you may not need coverage at all. Layering can cut premiums by 20–30% versus a single 30-year policy.
What to subtract: existing assets
Once you've calculated gross need with DIME, subtract the resources your family would already have:
- Liquid savings and investments (brokerage, savings, CDs). Subtract 100%.
- Retirement accounts. Subtract 70–80%—taxes and penalties will reduce what's actually usable.
- Existing individual life insurance you already own.
- Employer life insurance. Subtract only 50%—you lose it if you change jobs, and you may change jobs before the term ends.
- Social Security survivor benefits. These can be substantial—up to $2,800/month per child and $2,800/month for a surviving spouse caring for minor children—but they end when the youngest child turns 16 and are reduced if the surviving spouse earns over the earnings cap.
Common mistakes to avoid
First, don't forget the stay-at-home spouse. Replacement childcare, housekeeping, and transportation cost $40,000–$70,000 per year—often more than the working spouse's after-tax income. A stay-at-home parent needs $300,000–$700,000 of coverage, not zero.
Second, don't count your home equity as a liquid asset. Yes, your family could sell the house, but forcing a grieving spouse to uproot the kids immediately is exactly what life insurance is designed to prevent. Count your home equity as zero for income replacement purposes.
Third, don't buy and forget. Re-run the DIME calculation every 5 years and after major life events: a new child, a home purchase, a divorce, a job change with significantly different income, or paying off the mortgage. Coverage needs almost always go down over time as assets grow and dependents launch.
Fourth, don't over-insure children. Child life insurance is sold on emotion, not math. The purpose of life insurance is to replace income—a child has none. A small final-expense policy ($10,000–$25,000) is reasonable; anything beyond that is better redirected into a 529 plan.
The practical checklist
- List every debt your family would still owe.
- Decide how many years of income to replace and discount to present value.
- Get your mortgage payoff statement and use the outstanding balance.
- Estimate $130,000–$300,000 per child for education depending on public or private college.
- Add $20,000–$30,000 for final expenses.
- Subtract liquid assets, 75% of retirement accounts, half of employer coverage, and estimated Social Security survivor benefits.
- The result is your coverage gap—buy term insurance to cover it.
- Match the term to when your kids are financially independent (usually 20 years).
- Layer policies of different lengths to save on premiums.
- Re-run the math every 5 years and after major life events.
To skip the spreadsheet work, try our Life Insurance Needs Calculator, which runs the DIME method for you and produces a coverage target in under two minutes. Once you have a number, get quotes from 4–6 highly rated term carriers—prices vary by 40–60% for identical coverage, and a 20-minute shopping exercise can save you thousands over the life of the policy.