Box sets » Forecast evaluation report

Forecast evaluation report - December 2018

Rewriting history – output growth since 2010
Revisions to National Accounts data are a normal part of the Blue Book process, which reconciles the different measures of GDP and incorporates information from annual data sources. This box explored how the estimated path of real GDP growth since 2010 has evolved over time, focusing in particular on revisions to GDP growth in 2012.

Economy categories: Real GDP

Cross-cutting categories: Data revisions

G7 growth and investment since the EU referendum
The vote to leave the EU had caused in a a slowdown in real GDP growth in the UK, with the main driver being weak investment growth. This box compared UK growth and investment since the referendum to that in the other major advanced countries in the G7.

Economy categories: Real GDP

Cross-cutting categories: International comparisons

Impact of post-referendum rise in inflation on the public
One unforeseen economic development affecting our March 2016 forecast was the upside surprise in inflation in 2017-18 as a result of the fall in the exchange rate. This box described the effect of that surprise on receipts, spending and borrowing.
Why have onshore CT receipts performed so well since 2013-14?
In recent years, onshore corporation tax receipts have repeatedly surprised on the upside. This box described the drivers behind that strength, in particular the contribution from a rising effective tax rate despite cuts to the headline rates.

Fiscal categories: Corporation tax, Bank surcharge

Forecast evaluation report - October 2017

Blue Book 2017 and dividend income
In recent years there has been a significant increase in the number of people setting themselves up as single-director companies (‘incorporations’), implying an increase in the share of household income received as dividends. ONS estimates of households dividend income were revised significantly as part of Blue Book 2017, and better capture this rise in incorporations. This box discussed the implications of these revisions, which implied a much higher level of household disposable income and household saving than previous estimates.
Fiscal policy and growth
Over the past six years there has been a large discretionary fiscal tightening in the UK. This box set out estimates of the effect of fiscal policy changes on GDP growth, based on estimates of the consolidation produced by the Institute for Fiscal Studies (IFS) together with estimates of fiscal multipliers, which are drawn from the available empirical literature. The box also considered how changes in discretionary fiscal policy compared with our forecast errors for GDP growth.

Economy categories: Real GDP

Cross-cutting categories: Fiscal multipliers, External forecasts

Revisions to borrowing in 2016-17
Initial estimates of the deficit can be revised significantly over subsequent months as more reliable data become available. This box set out how our forecasts during 2016 and 2017 evolved and how the outturns for 2016-17 were revised over time.
The receipts-to-GDP ratio since 1986-87
Strong overall receipts growth in 2016-17 took receipts as a share of GDP to their highest since 1986-87. This box explored how the composition of the public sector’s income has changed over the three decades since receipts were last at the latest share of GDP.

Forecast evaluation report - October 2016

Stamp duty land tax (SDLT) is one of the more volatile sources of receipts. In our 2016 Forecast evaluation report, this box identified a number of reasons why forecasting SDLT receipts is challenging, including the concentration of receipts in a small proportion of expensive properties and the effects of significant policy changes.

Economy categories: Housing market, Property transactions

Fiscal categories: Receipts, Stamp duty land tax

Cross-cutting categories: Forecast process, Forestalling

External forecasters’ revisions to GDP growth and borrowing
Our 2016 Forecast evaluation report was published around four months after the EU referendum was held. Over that period forecasters had revised their real GDP growth and borrowing forecasts. This box summarised those revisions and the relationship between them. It illustrated the uncertainty that forecasters faced in trying to predict the impact of the referendum result and Brexit on the economy and public finances.

Economy categories: Real GDP

Fiscal categories: Public sector net borrowing

Cross-cutting categories: Forecast process, External forecasts

Forecast evaluation report - October 2015

We use a large number of fiscal forecasting models to generate our bottom-up forecasts of the public finances. This box outlined why models are essential forecasting tools, the various types of model used and how their performance is assessed.

Fiscal categories: Receipts, Environmental levies

Cross-cutting categories: Forecast process

Forecast evaluation report - October 2014

Rewriting history: Blue Book 2014
Revisions to National Accounts data are a normal part of the Blue Book process, which reconciles the different measures of GDP and incorporates information from annual data sources. The 2014 Blue Book contained particularly large changes because it was the first time that the National Accounts were published on an ESA10 accounting basis. This box set out some of the key changes in Blue Book 2014 and their impact on some of the key economy variables.

Economy categories: Nominal GDP, Economic data revisions

Cross-cutting categories: Data revisions, Blue Book

‘Computable general equilibrium’ (CGE) modelling is a tool for assessing the potential medium and long-term economic impact of policy changes. This box explored recent Government CGE studies of cuts to corporation tax and fuel duties alongside the potential impact of other recent tax rises and spending cuts.
This box explored the implications of the new 2010 European System of Accounts (ESA10) on our public finances forecast, ahead of its incorporation in our December 2014 EFO. Annex B of our March 2014 EFO explained these changes in more detail.
Effect of the additional rate of income tax on receipts
An additional rate of income tax of 50p for incomes over £150,000 was introduced in April 2010. Budget 2012 announced that this rate would be reduced to 45p from April 2013. This box explored how the incomes of those affected by this change evolved over this period - in particular the significance of forestalling and income shifting.

Fiscal categories: Receipts, Income tax

Cross-cutting categories: Forestalling

Forecast evaluation report - October 2013

Rewriting history: the 1990s recession and recovery
Revisions to National Accounts data are a normal part of the Blue Book process, which reconciles the different measures of GDP and incorporates information from annual data sources. This box explored how the estimated path of the 1990s recession and recovery evolved from estimates made in the 1992 Blue Book to estimates made in the 2013 Blue Book.

Economy categories: Economic data revisions, Real GDP

Cross-cutting categories: Data revisions, Blue Book

How has the story changed since last year?
In our 2012 Forecast Evaluation Report, we noted that nominal GDP had held up closer to our June 2010 forecast than real GDP, helping to explain why our fiscal forecasts out to 2011-12 had remained broadly on track. This box in our 2013 Forecast Evaluation Report discussed how this assessment changed in light of revisions to GDP data. While nominal GDP now appeared to be weaker than forecast, the relatively tax-rich components - such as nominal consumption and wages and salaries - held up relatively well.
To estimate the impact of a measure or package on the economy, we use a set of fiscal multipliers. This box outlines some recent research on the size of multipliers, how the multiplier varies during the economic cycle and how multipliers 'taper' over time.

Economy categories: GDP by expenditure, Government consumption

Fiscal categories: Structural deficit

Cross-cutting categories: Fiscal multipliers

The impact of forestalling on income tax receipts
An additional rate of income tax of 50p for incomes over £150,000 was introduced in April 2010. Budget 2012 announced that this rate would be reduced to 45p from April 2013. This box explored how incomes were shifted (forestalled) in response to these policy changes

Fiscal categories: Receipts, Income tax

Cross-cutting categories: Forestalling

Forecast evaluation report - October 2012

Rewriting history: the 1990s recession and recovery
Each year, the ONS publishes the National Accounts ‘Blue Book’. The revisions it contains are often a source of revisions to our subsequent forecasts. In this box, we illustrated the scope for history to be rewritten by exploring how the reported pattern of the recession and recovery of the early 1990s had evolved between the Blue Books published shortly after the recession and the most recent Blue Books available at the time.

Economy categories: Economic data revisions, Real GDP

Cross-cutting categories: Data revisions, Blue Book

Flow of funds
An alternative way to view the sectoral decomposition of the economy is to look at the financial balances of households, firms, government and the rest of the world. This box explored net lending by sector from 2008 to 2012, and how this compared with our June 2010 forecast

Economy categories: Sector net lending

Cross-cutting categories: Financial sector

International comparisons of productivity
The UK, the US and Germany all saw broadly similar falls in GDP over 2009, but their labour markets responded differently. This box discussed these differences and compared the behaviour of employment, hours and productivity over this period.
To estimate the impact of a measure or package on the economy, we use a set of fiscal multipliers. This box outlined some recent research on the size of multipliers and how the multiplier varies during the economic cycle.

Economy categories: GDP by expenditure, Government consumption

Cross-cutting categories: Fiscal multipliers

Forecast evaluation report - October 2011

Revisions to National Accounts data are a normal part of the Blue Book process, which reconciles the different measures of GDP and incorporates information from annual data sources. This box set out the key differences between the vintage of data used for the purposes of the October 2011 Forecast Evaluation Report and the data consistent with the 2011 Blue Book.