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Check the contract inputs
Name the option type, side, underlying, strike, expiry and units. For combinations, verify matching dates and quantity. Mark any exercise or settlement feature outside the supplied expiry model.
Reconcile each computational layer
| Layer | Question |
|---|---|
| Holder payoff | Correct subtraction and zero floor? |
| Position amount | Long/short sign and unit quantity? |
| Premium | Paid or received, on which date? |
| Simple profit | Is funding deliberately omitted? |
| Current parity | Compatible exercise/income conditions and KD? |
Test more than one region
Use below-strike, at-strike and above-strike values. Check premium-adjusted crossings and the algebra beyond a finite chart. For a replication, compare both package expressions in every relevant region.
Keep the result conditional
The calculation does not provide a current option valuation, forecast, margin amount or investment recommendation. The original scenarios and chart ranges are educational inputs. Current official errata should be checked when using curriculum diagrams or labels.