A lift installation contractor, constructed for this page like every figure in it, refinances its term loan and overdraft to a new bank. Its old bank has three guarantees outstanding for it: a US$1.2m performance bond to a hospital builder that expires in nine months, a US$0.5m retention bond that expires in twenty months, and an advance payment guarantee to an overseas buyer, denominated in euro and worth US$800,000 at today's rate. The old bank agrees to release its general security if the guarantees are cash-covered, at 100% for the dollar bonds and 110% for the euro guarantee. The ratios are the example's, not a market norm.
Performance bond 1,200,000 × 100% = 1,200,000
Retention bond 500,000 × 100% = 500,000
Advance payment 800,000 × 110% = 880,000
Cash cover, in US$ 2,580,000
Nine months later the performance bond expires with no demand made, and the old bank releases US$1.2m back to the contractor. Then the contractor delivers late, and the overseas buyer calls the advance payment guarantee in full. The euro has risen 7% against the dollar since the cover was set.
Cost to the bank of the call: 800,000 × 1.07 = 856,000
Cover held for it 880,000
Returned to the contractor 24,000
Had cover been 100%: 856,000 − 800,000 = 56,000 unsecured
The margin did its job. Without it the old bank would hold an unsecured claim of US$56,000 against a customer that banks elsewhere. The contractor, for its part, took US$2.58m out of its working capital at the start, a gap the new bank's facilities carried, in this example, before they funded any growth. Had the contractor held euro, cover in that currency would have matched the guarantee without a margin.