Minimum Capital Requirements for Market Risk

The first step in the calculation is to weight the positions in each time band by a factor designed to reflect the price sensitivity of those positions to assumed changes in interest rates. The weights for each time band are set out in Table 4. Zero-coupon bonds and deep-discount bonds (defined as bonds with a coupon of less than 3%) should be slotted according to the time bands set out in the second column of Table 4. Maturity method: time bands and weights Table 4 Coupon 3% or more Coupon less than 3% Risk weight Assumed changes in yield 1 month or less 1 month or less 0.00% 1.00 1 to 3 months 1 to 3 months 0.20% 1.00 3 to 6 months 3 to 6 months 0.40% 1.00 6 to 12 months 6 to 12 months 0.70% 1.00 1 to 2 years 1.0 to 1.9 years 1.25% 0.90 2 to 3 years 1.9 to 2.8 years 1.75% 0.80 3 to 4 years 2.8 to 3.6 years 2.25% 0.75 4 to 5 years 3.6 to 4.3 years 2.75% 0.75 5 to 7 years 4.3 to 5.7 years 3.25% 0.70 7 to 10 years 5.7 to 7.3 years 3.75% 0.65 10 to 15 years 7.3 to 9.3 years 4.50% 0.60 15 to 20 years 9.3 to 10.6 years 5.25% 0.60 Over 20 years 10.6 to 12 years 6.00% 0.60 12 to 20 years 8.00% 0.60 Over 20 years 12.50% 0.60 14.27 The next step in the calculation is to offset the weighted longs and shorts in each time band, resulting in a single short or long position for each band. Since, however, each band would include different instruments and different maturities, a 10% capital requirement to reflect basis risk and gap risk will be levied on the smaller of the offsetting positions, be it long or short. Thus, if the sum of the weighted longs in a time band is USD 100 million and the sum of the weighted shorts USD 90 million, the so-called vertical disallowance for that time band would be 10% of USD 90 million (ie USD 9 million). 14.28 The result of the above calculations is to produce two sets of weighted positions, the net long or short positions in each time band (USD 10 million long in the example above) and the vertical disallowances, which have no sign. (1) In addition, however, banks will be allowed to conduct two rounds of horizontal offsetting: (a) first between the net positions in each of three zones, where zone 1 is set as zero to one year, zone 2 is set as one year to four years, and zone 3 is set as four years and over (however, for coupons less than 3%, zone 2 is set as one year to 3.6 years and zone 3 is set as 3.6 years and over); and (b) subsequently between the net positions in the three different zones. (2) The offsetting will be subject to a scale of disallowances expressed as a fraction of the matched positions, as set out in Table 5. The weighted long and short positions in each of three zones may be offset, subject to the matched portion attracting a disallowance factor that is part of the capital requirement. The residual net position in each zone may be carried over and offset against opposite positions in other zones, subject to a second set of disallowance factors. Horizontal disallowances Table 5 Zones 59 Time band 57 Within the zone Between adjacent zones Between zones 1 and 3 Zone 1 0-1 month 1-3 months 3-6 months 6-12 months 40% 40% 100% Zone 2 1-2 years 2-3 years 3-4 years 4-5 years 30% 40% Zone 3 5-7 years 7-10 years 10-15 years 15-20 years Over 20 years 30%