How to Use the Deductible Trade-off Calculator

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What this calculator actually helps you understand

The Deductible Trade-off calculator exists for investors who want to pick optimal insurance deductible. It turns that decision into a repeatable checklist instead of a guess. It works best when claim probability known. Rather than promising outperformance, it helps you surface the trade-offs described as “Show expected value vs cash-flow risk.”

Inputs explained (with realistic examples)

Starting amount: How much you already have earmarked for the goal (exclude money committed elsewhere).
Contribution or payment: What you plan to add (or pay) each period. Use realistic cash-flow numbers, not aspirational ones.
Return, rate, or inflation assumption: A planning input to compare scenarios. Treat it as a range, not a forecast.
Time horizon: How long the money stays invested or the loan remains outstanding.

Outputs: how to read the results

Projected value or cash need: What the inputs imply for your savings goal or cost comparison.
What it does not do: Guarantee returns or outcomes. It simply applies the assumption "Claim probability known" to your inputs.

Common mistakes people make

Confusing per-incident vs annual.
Treating the output as a forecast instead of a scenario.
Ignoring fees, taxes, or behavior changes that sit outside the model.

When this calculator is genuinely useful

When you need a calm way to pick optimal insurance deductible without hand-waving.
When you want to communicate the rationale behind deductible trade-off decisions to a partner, advisor, or investment committee.
When you need to compare multiple scenarios quickly (best/middle/worst).

When this calculator can mislead you

When the core assumption (“Claim probability known”) clearly does not hold in your situation.
When inputs are based on optimistic guesses rather than verifiable numbers.
When behavioral factors (sticking with contributions, honoring stops, etc.) matter more than the math.

How this fits into a broader financial decision

Deductible Trade-off is one slice of the decision. Pair it with qualitative checks: liquidity needs, tax context, counterparties, and diversification. Link it with companion calculators (for example: Show expected value vs cash-flow risk) so readers see how today’s choice affects the rest of the plan.

Use the calculator

👉 Try the calculator here

Rules

Do not treat any scenario as personalized advice.
Stay conservative with inputs and double-check assumptions before acting.
Avoid country-specific tax or regulatory claims unless you verify them yourself.

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