Our forecasts of income and expenditure allow us to produce a forecast of sector net lending – the balance of saving and capital spending for each sector. This provides a useful diagnostic on the coherence of the economic forecast. We also construct a forecast of the household balance sheet – the stock of households’ financial assets and liabilities – that is consistent with our forecast of households’ net lending.

  • Household saving ratio

    The household saving ratio forecast is determined by forecasting its three components: household disposable income, the net pension equity adjustment and household consumption. The household saving ratio is defined in the National Accounts as being equal to:

    Household saving ratio

    Our forecasts for nominal household consumption and household disposable income are described in the relevant sections of this guide.

    The net pension equity adjustment represents the amount added to or subtracted from the net equity held by households in their pensions. It is equal to contributions to funded pension schemes by employers (both imputed and actual) and employees, less pension benefits paid out. Employers’ pension contributions are generally assumed to grow in line with wages and salaries, plus any adjustment for the effect of policies, including auto-enrolment. Our forecast for employee pension contributions is determined by the gilt rate and closing pension liabilities, consistent with the measurement of this variable in the National Accounts. Again, we will make any adjustment necessary for the effect of policies, including auto-enrolment. Payments of pension benefits are generally assumed to grow in line with the size of the relevant age group of the population, plus inflation.

    While the household saving ratio forecast is mechanically derived from the forecasts of its individual components, it provides a useful diagnostic on the household income and spending forecasts as a whole. The resulting profile of the saving ratio can therefore be used to inform our judgements about household consumption and household disposable income. In doing so we typically also consider a measure of the saving ratio that excludes the pension equity adjustment from the numerator and denominator, on the basis that this component may be less visible to households (especially the imputed elements) and therefore perhaps less relevant to their consumption decisions.

    Once we have a forecast for household saving, we can then derive a forecast for household net lending by taking household saving (which is equal to the numerator in the saving ratio) and subtracting household gross capital formation (which is made up largely of nominal household investment, and is determined by our forecasts for real residential investment, house prices and the consumption deflator).

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  • Sector net lending

    In the National Accounts framework underpinning our economic forecast, the income and expenditure of the different sectors imply a path for each sector’s net lending or borrowing from others. These must sum to zero – for each pound borrowed, there must be a pound lent. (In practice, the National Accounts include small statistical discrepancies in order for the various measures to sum to zero. We typically hold these constant through the forecast at their latest quarterly value.)

    Once we have determined our forecasts for expenditure and income for each sector, this gives a forecast for net lending. Taking each sector in turn:

    • the rest of world sector’s net lending position is largely determined by the current account balance;
    • the public sector net lending position is taken directly from our forecast of the public finances; and
    • the corporate sector net lending position reflects corporate profits and investment. It is derived by residual in our forecast to ensure that the sector net lending positions sum to zero across the economy as a whole. This is consistent with the treatment of this sector in the National Accounts: corporate profits, for example, are largely determined as the residual between whole economy nominal income and all other elements of income. But it is important to note that even though the net lending position of the corporate sector is derived by residual, it is consistent with our forecast for corporate profits and corporate expenditure (such as business investment) as these elements are components of aggregate expenditure and aggregate income.

    While our sectoral net lending forecasts are the arithmetic consequence of judgements and assumptions elsewhere in the forecast, they do not necessarily mark the end of the forecast process. The profile of each sector’s net lending provides an important overall diagnostic on the coherence of the economic forecast. This can prompt adjustments to the judgements we make about each sector’s income and expenditure in subsequent rounds of the forecast.

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  • Household balance sheet

    The flow of funds constraint

    Our forecast of the household sector balance sheet includes forecasts of assets and liabilities. The balance sheet forecast is ‘stock-flow consistent’: that is, households’ acquisition of assets and liabilities are consistent with their aggregate flows of income and saving. The change in the stock of assets or liabilities then reflects both households’ net acquisition of the relevant asset or liability and, where relevant, revaluation effects.

    The household balance sheet is subject to the flow-of-funds constraint as set out in the National Accounts:

    Household balance sheet

    Our forecast for household net lending is the starting point for forecasting for the household saving and household investment. The assets forecast is split into four elements: deposits, equity, pensions and insurance, and ‘other’ assets. The liabilities forecast is split into secured (i.e. mortgage) debt and unsecured debt. Our general approach is to forecast each of these elements separately. In order to ensure consistency between the stock and flow position of households’ financial accounts, one of these elements must be derived by residual. ‘Other assets’ performs this role.

    Household liabilities

    • our forecast for secured (mortgage) debt is based on an assumed path for borrowing for house purchases, less net repayments and write-offs. Borrowing for house purchases is projected on the basis of our forecasts for house prices, property transactions and an assumption about the loan-to-overall-value ratio (a whole economy equivalent of the familiar loan-to-value ratio in individual house purchases). Net repayments and write-offs are projected on the basis of historical trends. Further details of this methodology can be found in Box 3.3 of our November 2016 Economic and fiscal outlook; and
    • the accumulation of unsecured debt is projected based on its relationship with a number of other variables in the forecast, including consumption, unemployment and property transactions. The forecast also includes an assumption about write-offs, which are assumed to remain at a constant proportion of the stock.

    Household assets

    • our forecast for household deposits is informed a number of factors, such as the outlook for secured debt, prospects for household consumption and credit conditions;
    • changes in the value of households’ stock of equity assets will reflect both households’ acquisition of equity and revaluations as equity prices fluctuate. The net acquisition of equity assets is projected in line with households’ net lending position. Revaluation effects are based on our forecasts for domestic and world equity prices;
    • our forecast for the stock of pension and insurance assets is determined by the accumulation of those assets and by revaluation effects. The accumulation of pension assets reflects our forecast for the net flow of pension saving, taken from the net pension equity adjustment in the household saving ratio. The accumulation of insurance assets is forecast on the basis of past trends and the rate of insurance premium tax. Revaluation effects are calculated using our forecast for domestic and world equity prices; and
    • ‘other’ assets, such as households’ debt securities, are treated as the residual element to ensure consistency between the stock and flow positions of the household financial accounts, and to ensure that the ‘flow of funds’ constraint holds. The forecast of other assets is therefore linked to our forecasts for household net lending and all other elements of the balance sheet. As such, our forecast for other assets acts as an important diagnostic on the household account as a whole.

    The difference between the value of households’ assets and liabilities gives a value for their financial net worth. Household net worth is equal to financial net worth plus the value of households’ physical assets (i.e. housing). Our forecast for the latter is derived from our forecasts of the housing stock and house prices.

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