Calculator
Enter targets, expenses, and offsets. Then calculate a coverage recommendation.
Example data
This example shows how inputs translate into a coverage estimate.
| Item | Example value |
|---|---|
| Desired annual income | $60,000 |
| Years of support | 20 |
| Other annual income | $10,000 |
| Inflation / Net return | 3% / 5% |
| Debts + final expenses | $57,000 |
| Education + other goals | $45,000 |
| Savings + existing coverage | $70,000 |
| Buffer | 10% |
| Estimated coverage outcome | Varies by assumptions |
Formula used
The calculator estimates a coverage amount that can fund an inflation-adjusted income stream and one-time needs, then subtracts offsets.
| 1) Income gap (grossed-up for taxes) | Gap = max(0, Target − Other) ÷ (1 − TaxRate) |
| 2) Present value of inflation-adjusted income | PV = P × (1 − ((1+g)/(1+r))^n) ÷ (r − g) |
| 3) Base need | Base = PV + Debts + Final + Education + OtherGoals |
| 4) Offsets | Offsets = Savings + ExistingCoverage (+ Retirement if selected) |
| 5) Recommended coverage | Recommended = max(0, Base − Offsets) × (1 + Buffer) |
How to use
- Enter the annual income your family would need.
- Add how many years the support should last.
- Include other income sources your family may receive.
- Set inflation and an expected net return assumption.
- Add debts, final expenses, and education goals.
- Subtract savings and current coverage offsets.
- Apply a small buffer, then calculate results.
- Export CSV or PDF to share and review.
Income replacement math in practical terms
Most families think in monthly bills, but coverage is usually purchased as one lump sum. This calculator converts an annual income target into a present-value estimate using your inflation and net return assumptions. When inflation is higher, future income needs grow faster, increasing the required lump sum. When net return is higher, the discounted cost of funding future income decreases.
How inflation and returns move the coverage target
Example: a $50,000 annual income gap for 20 years at 3% inflation and 5% net return produces a smaller present value than the same gap at 5% inflation and 4% return. The spread between return and inflation matters. If the two rates are close, the lump sum required rises sharply because growth in needs is not offset by growth in assets.
Separating income needs from one-time obligations
Income support covers ongoing living costs, while debts, final expenses, and education goals are immediate liabilities. Treating these separately improves clarity. A household may need 15 years of income support, yet still want a full mortgage payoff on day one. This tool adds one-time items directly to the income present value to build a complete base need.
Offsets that reduce required coverage
Existing savings and current coverage lower the gap you must insure. Retirement assets are optional because using them can disrupt long-term plans. Including retirement as an offset may reduce the coverage recommendation today, but increases reliance on market timing and withdrawal strategy later. Use the toggle only if the plan is to draw those funds for near-term support.
Using a buffer to handle uncertainty
Life changes rarely follow a clean forecast. A modest buffer, such as 5% to 15%, can help cover timing risk, healthcare surprises, or short-term income interruptions. A very large buffer can overstate coverage and increase premiums unnecessarily. Recalculate after major events like a new child, mortgage refinance, job change, or meaningful asset growth.
FAQs
1) What does “net investment return” mean?
It is the expected annual return after fees and taxes that you believe could be earned on invested proceeds.
2) Why does the calculator gross-up the income gap for taxes?
If payouts are taxable in your situation, you may need more gross income to deliver the same spendable amount.
3) Should I include retirement assets as an offset?
Only if your plan is to use those funds for income support. Otherwise, leaving them out avoids underestimating coverage.
4) Why is inflation included for income needs but not for debts?
Debts and final expenses are treated as today’s lump sums. Income support is modeled across future years, so inflation applies.
5) What if my return rate is lower than inflation?
The present value can rise because future needs grow faster than invested assets. Consider conservative inputs and a shorter support horizon.
6) How often should I update the estimate?
Review annually and whenever income, debts, dependents, or savings change. Small updates keep the coverage target realistic.