Life insurance income replacement: model the household cash flow, not the salary
Income replacement is not automatically the insured person's gross pay multiplied by a fixed number of years. Start with the household spending that would continue, subtract dependable survivor income and benefits, and state how long the remaining gap should be funded.
A cash-flow model for deciding which part of earnings survivors would actually need and for how long.
Replace the gap, not the pay stub
Gross earnings pay taxes, retirement contributions, work costs and household spending. After a death, some items stop, some continue and others appear. Begin with the monthly amount survivors need for housing, food, transport, health care, care work and ordinary life. Then subtract dependable survivor earnings and benefits.
Keep uncertain income outside the base case. A survivor may return to work later, but child care or training may delay that plan. Public survivor benefits have eligibility rules. Use an official estimate or qualified adviser rather than entering a hoped-for amount.
Separate three phases instead of using one average
| Phase | Likely cash-flow issue | Evidence to use |
|---|---|---|
| Immediate transition | Leave from work, final costs, travel and urgent care changes | Emergency budget and employer benefits |
| Dependent years | Ongoing living costs, child care and education support | Current spending and dependent milestones |
| Later bridge | Smaller gap before retirement or asset independence | Retirement plan and projected survivor income |
Expenses that often move in opposite directions
Employment costs
Commuting, payroll tax and retirement contributions tied to the deceased earner may stop.
Care work
Child care, elder care, transport and household help can rise materially.
Housing
The mortgage may continue, be repaid or be replaced by a different housing plan.
Health coverage
Employer-sponsored coverage and survivor premiums may change after the death.
Education savings
A planned contribution can continue only if it is explicitly included in the model.
Do not turn an income bridge into an investment forecast by accident
Some models divide the desired annual income by an assumed investment return. That can make the coverage amount highly sensitive to one percentage. Returns, taxes, inflation, fees and withdrawal sequence are uncertain. Show the rate and run a lower-return case rather than presenting a single capitalized number as certain.
A simpler method multiplies the annual gap by a defined number of years, then adds or subtracts separate obligations and resources. It is less sophisticated but easier to audit. Complex retirement, trust or tax planning belongs with qualified professionals who can model the household's actual circumstances.
Build the file from household records
Use a typical year, then mark costs that are seasonal or expected to change.
- After-tax household spending
- Work costs that would stop
- Care and household work to replace
- Reliable survivor earnings
- Verified public and employer benefits
- Transition period and later support period
- Inflation or return assumption used
- Existing assets assigned to the bridge
Connect cash flow to amount and term
Use the income replacement scenario builder to compare phases. Then add one-time obligations in the coverage planner and align the support period with the term-length tool.
Questions about income replacement
Should taxes be included in income replacement?
Use after-tax household cash flow when practical, then document the assumption. Tax treatment and survivor circumstances can differ, so a professional may be needed for a personal plan.
Does a stay-at-home parent need income replacement?
The financial need may be the cost of replacing care, transportation, household management and other unpaid work rather than lost wages.
Sources and limits
Verify taxes, public benefits and investment assumptions for your household before relying on the result.