Determine what a group company should pay for an intra-group guarantee: the borrower’s credit margin without the guarantee minus the margin at the guarantor’s rating, with the expected-loss cross-check as a binding floor — and a certified, reproducible report with the full methodology.
Chapter X of the OECD guidelines treats an explicit group guarantee as a service with a price: the borrower pays for the funding benefit the guarantee provides, not for the implicit support it already enjoys as a group member. That distinction almost always turns the discussion with the inspector into a calculation.
This tool computes that benefit as the difference between two margins for the same borrower — with and without the guarantee — and places an expected-loss cross-check beside it. The report shows both margins, the intermediate steps, the tool version and the dataset vintage, with a hash anyone can verify publicly.