What the needs approach measures
The needs approach starts from the obligations your death would create and works down to a number. It has four parts, and each answers a different question.
Income replacement asks what your household spends that your paycheque currently funds. It is not your whole salary: your own food, clothing, commuting, retirement contributions and the taxes on your earnings all stop. Most analyses land between 60% and 80% of gross income, and the correct figure for you comes from your actual budget rather than from a rule.
Lump-sum obligations are the things that come due at once. A mortgage that would otherwise crush a single-income household. Consumer debt that does not die with you in most states. An education fund, which is a real cost with a hard deadline. Final expenses — funeral, unreimbursed medical bills, estate administration.
Offsets are what your family already has: savings, taxable investments, accessible retirement accounts, and every death benefit already in force including the group life your employer provides.
The gap is the difference, and it is the only output that turns into a purchase decision.
This is one of three standard methods, and it is the one that produces a defensible number for a household. The human life value method values your remaining lifetime earnings instead and is what underwriters use to justify a large face amount. The DIME method is a fast four-item screen. Where the needs approach differs from both is that it subtracts what already exists.
Why the income piece must be discounted
Twenty years of $60,000 is not $1.2 million, and treating it as though it were is the most common error in do-it-yourself coverage sizing. The payout arrives as a lump sum on day one, and the money that funds year twenty sits invested for nineteen years before it is spent. Discounting is how you account for that.
Two rates fight each other. The investment return makes the fund grow. Inflation makes each year's withdrawal larger than the last, because the family needs constant purchasing power rather than constant dollars. The clean way to handle both at once is the real rate from the Fisher relation:
r = (1 + d) ÷ (1 + f) − 1
At a 5% return with 2.5% inflation the real rate is 1.05 ÷ 1.025 − 1 = 2.439%, not the 2.5% you get by subtracting. The difference is small at these rates and grows at higher ones. Once you have the real rate you discount a level stream at it, and inflation is fully handled — that is the whole point of the substitution.
The annuity factor is written as an annuity due because the first withdrawal happens immediately. Multiplying the ordinary annuity factor by (1 + r) shifts every payment forward one period, which raises the present value by exactly one period of growth. At 5% and twenty years, the ordinary factor is 12.4622 and the due factor is 13.0853 — a 5% difference, or about $31,000 on a $50,000 draw.
What happens when the real rate is zero or negative. If you assume inflation matches or beats the investment return, the factor collapses to the number of years and the present value becomes the full undiscounted sum. That is the most conservative assumption this method can express, and it is a defensible one for a family that will hold the payout in cash.
Worked example: $85,000 of income, two children, a mortgage
You earn $85,000. Your household would need about 70% of that once your own consumption stops. You want the income to run twenty years, until the younger child finishes college. You assume a 5% return on a conservatively invested payout and 2.5% inflation. The mortgage is $240,000, other debts are $25,000, you want $120,000 set aside for education and $20,000 for final expenses. Your family has $60,000 in liquid savings and you carry $150,000 of group life at work.
- Annual draw. $85,000 × 70% = $59,500.
- Real rate. 1.05 ÷ 1.025 − 1 = 2.43902%.
- Ordinary annuity factor. (1 − 1.02439024−20) ÷ 0.02439024. 1.0243902420 = 1.6192305, so its reciprocal is 0.6175773, and (1 − 0.6175773) ÷ 0.02439024 = 15.679331.
- Annuity-due factor. 15.679331 × 1.02439024 = 16.061753.
- Present value of income. $59,500 × 16.061753 = $955,674.
- Lump sums. $240,000 + $25,000 + $120,000 + $20,000 = $405,000.
- Total need. $955,674 + $405,000 = $1,360,674.
- Offsets. $60,000 + $150,000 = $210,000.
- Gap. $1,360,674 − $210,000 = $1,150,674, which you would round to a $1.15 million or $1.2 million face amount.
Two sanity checks on that number. First, the undiscounted income stream would have been $59,500 × 20 = $1,190,000, so discounting removed $234,326 — that is 234,326 ÷ 1,190,000 = 19.7% of the raw sum, which is what a 2.439% real rate over twenty years does. Second, the gap is 1,150,674 ÷ 85,000 = 13.5 times gross income, which sits above the ten-times rule of thumb precisely because this household has a mortgage and an education target on top of income replacement. Rules of thumb do not know about your mortgage.
How to read the result
The gap is a face amount, not a budget. Round it up to a figure carriers quote — face amounts are written in $25,000 or $50,000 steps and there is often no price penalty for rounding up to the next band, because rate bands themselves step at $100,000, $250,000, $500,000 and $1 million. Crossing into a higher band can genuinely lower the cost per thousand.
A negative gap means over-insurance at these assumptions, and it deserves one check before you act on it. How much of your offset is group life? Employer coverage typically ends the day you leave, is rarely portable at the same price, and is almost never convertible on good terms. Coverage that exists only while you hold this job is not the same asset as an individual policy you own.
Test the answer against your two softest assumptions. The years of support and the real rate together move the income piece more than everything else combined. The reference table below shows what the support period alone is worth. If your decision flips between two support periods you consider equally plausible, buy the longer one — the marginal cost of years you turn out not to need is much smaller than the cost of a shortfall you cannot fix later, because your insurability can change and your need cannot be re-underwritten retroactively.
The suggested term length rounds your support period up to a term carriers sell. It is a starting point rather than an answer, because the need is not level across the period — the mortgage amortises and the children get older. Splitting the face amount across two or three staggered terms tracks that decline and costs less than one level policy; the term ladder calculator prices that structure directly.
Present value of $1 a year, by real rate and support period
| Real rate | 10 yr | 15 yr | 20 yr | 25 yr | 30 yr |
|---|---|---|---|---|---|
| 0.0% | 10.0000 | 15.0000 | 20.0000 | 25.0000 | 30.0000 |
| 1.0% | 9.5660 | 14.0037 | 18.2260 | 22.2434 | 26.0658 |
| 2.0% | 9.1622 | 13.1062 | 16.6785 | 19.9139 | 22.8444 |
| 2.5% | 8.9709 | 12.6909 | 15.9789 | 18.8850 | 21.4535 |
| 3.0% | 8.7861 | 12.2961 | 15.3238 | 17.9355 | 20.1885 |
| 4.0% | 8.4353 | 11.5631 | 14.1339 | 16.2470 | 17.9837 |
| 5.0% | 8.1078 | 10.8986 | 13.0853 | 14.7986 | 16.1411 |
Factors are [(1 − (1+r)^−N) ÷ r] × (1+r), the same expression the calculator evaluates. The 0% row is N by definition.
Mistakes that distort the answer
- Double-counting the mortgage. Either pay it off as a lump sum or keep replacing the income that services it — not both. Counting it twice on the default figures adds a quarter of a million dollars of face amount you do not need.
- Replacing 100% of income. Your own consumption, commuting costs, work clothing, payroll taxes and retirement contributions all stop. Replacing gross income buys coverage for spending that will not happen.
- Counting group life as permanent. It ends when the job does, and it usually ends at exactly the moment a mid-career health event has made individual cover expensive.
- Forgetting the non-earning spouse. Childcare, transport and household management have a market price, and a surviving earner has to buy them. Run the analysis a second time with that person's replacement cost as the income figure.
- Ignoring survivor benefits. Social Security pays a surviving-child and surviving-parent benefit that can materially reduce the income need for a household with young children. Look up your family's actual figure on your Social Security statement and reduce the replacement percentage accordingly.
- Assuming an equity return on money a grieving family will hold. The payout is usually parked conservatively for at least a year. A real rate above 5% is an assumption doing a great deal of work in your favour.
Life insurance proceeds and tax
A death benefit paid to a named beneficiary is generally excluded from the recipient's gross income under section 101(a) of the Internal Revenue Code, so the figures here need no gross-up for income tax on the proceeds. Two qualifications matter. Interest paid on the proceeds — if the beneficiary chooses a settlement option rather than a lump sum — is taxable. And the death benefit is included in your estate for estate tax purposes if you held incidents of ownership in the policy, which is the reason large policies are often owned by an irrevocable trust rather than by the insured. Neither point changes the sizing arithmetic; both change who should own the policy.
Where this method fits, and when to use a different one
Use the needs approach when there is a household to protect. It is the method that produces a number you can defend line by line to the person who would have to live on it, and it is the one financial planners work from.
Use human life value when the question is what your earning capacity is worth. Underwriters apply it to test whether a requested face amount is justified, and courts use a version of it in wrongful-death matters. It ignores existing assets entirely, so it usually gives a larger number, and it is the right frame when the issue is the economic loss rather than the household budget. The human life value calculator works it in full.
Use DIME as a screen. Debt, income, mortgage, education added together takes two minutes and gets you within range. It does not discount the income stream, so it overstates the income piece, and it does not subtract assets, so it overstates the total. As a check that the careful analysis has not gone badly wrong in either direction, it is useful.
Once you have a face amount, the remaining questions are product and structure: level term against a ladder, term against permanent coverage, and whether any cash value component is earning its cost — which is what the cash value return calculator measures. Size first, then choose the product. Doing it the other way round is how people end up with a policy that fits a premium budget rather than a family.