Australia                  4.50%                  4.50% 
                                  Europe                  3.00%                  3.00% 
                                  Canada                  3.00%                  3.00% 
===========================  ===========  =====================  ===================== 
 Foreign Exchange                GBP/AUD                   2.03                   2.01 
                                 GBP/CAD                   1.84                   1.78 
                                 GBP/EUR                   1.23                   1.16 
===========================  ===========  =====================  ===================== 
 Tax Rate                             UK                 20%(2)                 20%(2) 
                               Australia                    30%                    30% 
                                  Europe    Various (no change)    Various (no change) 
                                  Canada    Various (no change)    Various (no change) 
===========================  ===========  =====================  ===================== 
 

(1) The portfolio valuation assumes current deposit rates are achieved until 31 December 2017 before adjusting to the long term rates noted in the table above

(2) The corporation taxation rate will reduce to 20% from 1 April 2015.

Discount rates

The discount rate used for valuing each investment is based on the appropriate long-term Government Bond rate plus a risk premium. The risk premium takes into account risks and opportunities associated with each project (including location, phase of operation/construction etc).

The majority of the Company's portfolio (81.9%) is comprised of investments where the Company only holds the Risk Capital in the underlying projects. The remaining portfolio (18.1%) is comprised of investments where the Company holds both the Risk Capital and the senior debt. In order to provide investors with a greater level of transparency, the Company publishes both a Risk Capital weighted average discount rate and a portfolio weighted average discount rate across all investments including senior debt interests.

The current discount rates used by the Company are provided in the table below. These rates need to be considered against the assumptions and projections upon which the Company's anticipated cash flows are based.

The average blended discount rates need to be interpreted with care. In the Company's view they are relevant only in the context of the cash flows (and cash flow assumptions) they are applied to in calculating the fair value of investments. Comparison of discount rates across competitor investment portfolios or funds is only meaningful if there is a comparable level of confidence in the quality of forecast cash flows (and assumptions) the rates are applied to; the risk and return characteristics of different investment portfolios are understood; and the depth and quality of asset management employed to manage risk and deliver expected returns are identical across the compared portfolios.

 
                                                                               Movement 
                                                                            31 December 
                                                                                 2013 - 
                                     31 December   30 June   31 December    31 December 
 Metric                                     2014      2014          2013           2014 
 Weighted Average Government 
  Bond Rate (Nominal) - portfolio 
  basis - Risk Capital and 
  senior debt                              2.79%     3.38%         3.46%        (0.67%) 
==================================  ============  ========  ============  ============= 
 Weighted Average Project 
  Premium over Government Bond 
  Rate - Risk Capital and senior 
  debt (Nominal)                           4.69%     4.37%         4.26%          0.43% 
==================================  ============  ========  ============  ============= 
 Weighted Average Discount 
  rate 
  - Portfolio basis - Risk 
  Capital and senior debt                  7.48%     7.75%         7.72%        (0.24%) 
==================================  ============  ========  ============  ============= 
 Weighted Average Discount 
  rate 
  - Risk Capital only(1)                   7.90%     8.21%         8.20%        (0.30%) 
==================================  ============  ========  ============  ============= 
 NAV per share                            127.0p    124.8p        123.0p           4.0p 
==================================  ============  ========  ============  ============= 
 
   (1)   Risk Capital is equity and subordinated debt investments. 

The change in the weighted average discount rate in the period is principally due to substantial reductions in the average government bond rates. However, this was partly offset by an increase in the weighted average project premium which took into account (i) an increase in the project premium reflecting observable market based evidence which does not support the full reduction in government bond yields, especially in Europe which has seen some of the largest negative bond yield movements and (ii) assets moving out of the construction or defects liability phase and towards full operations.

Government bond rates

In the table above the Company has provided an analysis of the weighted average government bond rate used in calculating the discount rate. It should be noted that the nominal (i.e. non inflation linked) bond rate has been used in this calculation. The Company considers, however, that investors may also find a comparison with inflation adjusted government bond rates helpful. This is the case due to the significant level of inflation linkage inherent in the Company's anticipated cash flows.

Real (i.e. inflation adjusted) bond rates are included in the table below. Using these real rates on a weighted average basis leads to a 'real' portfolio rate of (0.05%) with the difference between the 'real' and 'nominal' rates reflecting in theory the implied rates of future expected inflation. In some countries this is higher than those currently being assumed to calculate the Company's estimate of NAV. This information is provided to enable investors to make approximate comparisons of the projected return of the Company with that available from government index linked bonds. It should be noted that any such comparison can only be estimated due in part to the fact that the Company's cash flows are not fully linked to inflation and the Company's cash flows already assume a core level of inflation as set out in the section headed Macroeconomic Assumptions on page 22.

 
                        31 December 2014     31 December 2013     Movement (2013 
                                                                       -2014) 
 Country                Nominal      Real     Nominal     Real   Nominal      Real 
 UK                       2.85%   (0.36%)       3.34%    0.01%   (0.49%)   (0.37%) 
====================  =========  ========  ==========  =======  ========  ======== 
 Australia                3.80%     1.41%       4.48%    1.91%   (0.68%)   (0.50%) 
====================  =========  ========  ==========  =======  ========  ======== 
 Europe(1)                2.17%     0.25%       3.39%    1.32%   (1.22%)   (1.07%) 
====================  =========  ========  ==========  =======  ========  ======== 
 Canada                   2.56%     0.57%       3.03%    0.96%   (0.47%)   (0.39%) 
====================  =========  ========  ==========  =======  ========  ======== 
 Portfolio weighted 
  average                 2.79%   (0.05%)       3.46%    0.53%   (0.67%)   (0.58%) 
====================  =========  ========  ==========  =======  ========  ======== 
 

(1) Includes Belgium, Germany, Ireland, and Italy. Note estimates only for Belgium and Ireland as no index linked bonds available.

Portfolio level assumptions underlying NAV calculation

The Company is aware that there are subtle differences in approach to the valuation of portfolios of investments among different infrastructure funds. To clarify the Company's position in this regard its key cash flow inputs and broad valuation principles include:

   >   That key macroeconomic variables (outlined in the section above) continue to be applicable 

> That the contracts under which payments are made to the Company and its subsidiaries remain on track and are not terminated before their contractual expiry date

> That where deductions are suffered under such contracts they are fully passed down to subcontractors

> That where possible lifecycle costs are not borne by the Company but are passed down to a third party such as a facilities management contractor

> That cash flows from and to the Company's subsidiaries and the infrastructure asset owning entities in which it has invested will be made and are received at the times anticipated

> That where assets are in construction they are either completed on time or any costs of delay are borne by the contractors not the Company

> That where the operating costs of the Company or the infrastructure asset owning entities in which it has invested are fixed by contract such contracts are performed, and where such costs are not fixed, that they remain within projected budgets

> That where the Company or the infrastructure asset owning entities in which it has invested owns the residual property value in an asset that the projected amount for this value is realised

> That where assets in which the Company invests are not GBP assets that foreign exchange rates remain consistent with current four year forward looking projections

Sensitivities for key macroeconomic assumptions and discount rates

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