{"id":123743,"date":"2026-09-10T11:18:30","date_gmt":"2026-09-10T05:48:30","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=123743"},"modified":"2026-09-10T11:18:30","modified_gmt":"2026-09-10T05:48:30","slug":"india-gdp-revisions","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/india-gdp-revisions\/","title":{"rendered":"India GDP Revisions: Why Growth Numbers Keep Changing"},"content":{"rendered":"<h2><b>India GDP Revisions Latest News<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">India&#8217;s GDP numbers have once again sparked debate. The Ministry of Statistics and Programme Implementation (MoSPI) has revised past growth rates going as far back as 2023-24, with some revised upward and others downward.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The short answer for these changes is &#8220;using PPI for double deflation&#8221;.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This article explains, in simple terms, how GDP data is compiled, why it gets revised, and what changed in India&#8217;s methodology in 2026.<\/span><\/li>\n<\/ul>\n<h2><b>Why GDP Data Gets Revised Regularly<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Revisions to past GDP numbers, especially quarterly ones, are routine. This is because quarterly and annual estimates are built differently:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>Quarterly estimates<\/b><span style=\"font-weight: 400;\"> use a &#8220;benchmark-indicator approach&#8221;.\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"3\"><span style=\"font-weight: 400;\">Movement in quarterly GDP is guided by high-frequency indicators such as crop production, cement production, finished steel consumption and commercial vehicle sales.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>Annual estimates<\/b><span style=\"font-weight: 400;\"> are based on actual output data.\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"3\"><span style=\"font-weight: 400;\">As more actual data becomes available from company financial results and MoSPI surveys, quarterly estimates are revised.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This explains the large upward revision in growth for January-March 2026 (Q4 of FY26), from 7.8 per cent to 8.6 per cent.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">However, changes to older data happened mainly because MoSPI shifted to a new indicator, the <strong><a href=\"https:\/\/vajiramandravi.com\/current-affairs\/from-wpi-to-ppi-indias-next-step-in-inflation-measurement\/\" target=\"_blank\">Producer Price Index (PPI)<\/a><\/strong>, to convert nominal GDP into real GDP.<\/span><\/li>\n<\/ul>\n<h2><b>The 2026 Base Year Revision<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In February 2026, MoSPI released a new GDP series after changing the base year from 2011-12 to 2022-23.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Every economy revises its base year periodically to include new data sources, improve methodology and capture the economy more accurately.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">During this rebasing, MoSPI also overhauled how it <\/span><b>removes the effect of inflation<\/b><span style=\"font-weight: 400;\"> from nominal GDP to arrive at real GDP.<\/span><\/li>\n<\/ul>\n<h2><b>How GDP Is Calculated<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">GDP is the sum of <strong><a href=\"https:\/\/vajiramandravi.com\/current-affairs\/gross-value-added-gva\/\" target=\"_blank\">Gross Value Added (GVA)<\/a><\/strong> by each sector, plus indirect taxes collected by the government, minus subsidies.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">GVA is the difference between the value of what a sector produces (output) and the raw materials it uses (inputs).\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At current prices, this is called <\/span><b>nominal GVA<\/b><span style=\"font-weight: 400;\">. The difficulty arises in calculating real GVA, which requires removing inflation.<\/span><\/li>\n<\/ul>\n<h2><b>Single Deflation: The Old Method<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Under the old series, <\/span><span style=\"font-weight: 400;\">the value of inputs and outputs for each sector was deflated<\/span><span style=\"font-weight: 400;\"> by the same number, except for agriculture and mining and quarrying.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This deflator was either the Consumer Price Index (CPI), the Wholesale Price Index (WPI) or one of their sub-indices.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The real input value was then subtracted from the real output value to get real GVA. This is called single deflation.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Single deflation works well only <\/span><b>when input and output prices move at the same rate<\/b><span style=\"font-weight: 400;\">. When they diverge, it produces errors.<\/span><\/li>\n<\/ul>\n<h2><b>Double Deflation: The New Method<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In double deflation, <\/span><b>inputs are adjusted by input inflation and outputs by output inflation<\/b><span style=\"font-weight: 400;\">. This gives a more accurate real GVA.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">MoSPI adopted double deflation in the 2022-23 series after repeated criticism that single deflation was either underestimating or overestimating real growth.<\/span><\/li>\n<\/ul>\n<h3><b>Example Illustrating the Difference<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A sector uses Rs 100 of inputs to produce Rs 200 of output. Nominal GVA is Rs 100.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Next year, inputs and outputs both rise 20 per cent to Rs 120 and Rs 240. Nominal GVA is Rs 120, a growth of 20 per cent.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Assume input prices rose 5 per cent and output prices rose 2 per cent.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Single deflation (using a common 3 per cent deflator): Real GVA is Rs 116.5, growth is 16.5 per cent, deflator is 3 per cent.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Double deflation (5 per cent for inputs, 2 per cent for outputs): Real GVA is Rs 121, growth is 21 per cent, deflator is -0.8 per cent.<\/span><\/li>\n<\/ul>\n<h2><b>What Double Deflation Implies<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Two key points emerge:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">When input prices rise faster than output prices, single deflation underestimates real GVA growth.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">A negative implicit deflator ensures that when nominal growth is low because firms have not fully passed on higher costs to consumers, real growth is not wrongly penalised.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">This was the case in April-June 2026, when nominal growth was 10.3 per cent.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This also explains why the manufacturing deflator has been negative in six of the 13 quarters since April-June 2023.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The <\/span><b>manufacturing deflator moves inversely<\/b><span style=\"font-weight: 400;\"> with crude oil prices, a crucial input. When oil prices rise, the deflator falls.\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Economists note that a negative deflator signals strong pipeline price pressures.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">If firms have pricing power, these costs will be passed on later, raising nominal growth while real growth may soften.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><b>The Shift to PPI<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When the new GDP series first came out in February, inflation was removed from the numbers using the CPI (retail prices), the WPI (wholesale prices) and their sub-indices.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The latest revisions happened because MoSPI has now switched to the Producer Price Index (PPI).\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">The PPI captures the price a producer actually receives at the factory gate.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">It leaves out taxes and the margins added by traders and transporters.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">It is therefore a cleaner measure of what producers earn.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><b>Why does the choice of index matter so much?\u00a0<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Because each sector&#8217;s inputs and outputs must be adjusted using an index that reflects that sector&#8217;s own prices.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The old series failed to do this for services. In July-September 2025, the last quarter under the old series, the services sector&#8217;s inflation was shown as just 1.2 per cent.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This was far too low. The reason was that the WPI was used to adjust services GVA, but the WPI tracks only goods and has no services in it at all. The result was a distortion.\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">When commodity prices were soft, wholesale inflation was low.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Services GVA was then adjusted by a number much smaller than the real price rise in services.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">This made real services growth look higher than it actually was. When commodity prices shot up, the opposite happened, and services growth looked lower than it really was.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">With PPIs, MoSPI now has more than 300 separate deflators to work with, compared to about 180 in the old series.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In simple terms, more sectors and sub-sectors are now adjusted using their own correct price index, so GVA is being measured more accurately.<\/span><\/li>\n<\/ul>\n<h2><b>Remaining Limitations<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The new methodology does not mean India&#8217;s GDP numbers are perfect. The input PPI is still at a trial stage and exists only for manufacturing.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Greater clarity will come when MoSPI publishes its &#8220;Sources and Methods&#8221; document later this month, detailing the compilation, data sources and methodologies of the new series.<\/span><\/li>\n<\/ul>\n<p><b>Source:<\/b> <strong><a href=\"https:\/\/indianexpress.com\/article\/explained\/explained-economics\/why-gdp-data-revised-ppi-double-deflation-explained-10864088\/\" target=\"_blank\" rel=\"nofollow noopener\">IE<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>India\u2019s GDP data has changed. But what exactly changed\u2014and why? Understand PPI, double deflation and the new GDP methodology in simple terms.<\/p>\n","protected":false},"author":18,"featured_media":123755,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[10144,60,22,59],"class_list":["post-123743","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-mains-current-affairs","tag-india-gdp-revisions","tag-mains-articles","tag-upsc-current-affairs","tag-upsc-mains-current-affairs","no-featured-image-padding"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/123743","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=123743"}],"version-history":[{"count":4,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/123743\/revisions"}],"predecessor-version":[{"id":123764,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/123743\/revisions\/123764"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/123755"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=123743"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=123743"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=123743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}