In today’s Finshots, we give you an oversimplified breakdown of the Index of Industrial Production (IIP) and what to make of it.

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The Story

If someone casually asked you how India’s economy performed in FY26, the first thing that’ll probably come to mind is GDP or the total value of goods and services India produced that year and whether that number went up or down.

But GDP isn’t the only way to understand the economy.

In fact, most economists see GDP as a lagging indicator. Simply put, it tells you what has already happened because it relies on past data and is released only after a quarter has ended.

So if you wanted a sense of where the economy might be headed before the bigger numbers arrive, it would make more sense to look at a leading indicator or something that offers clues about future economic trends.

A couple of days ago, the government released one such indicator. We’re talking about the Index of Industrial Production (IIP).

Now, to be fair, IIP isn’t a perfect leading indicator either. The MoSPI (Ministry of Statistics and Programme Implementation) releases it every month, but with a 28-day lag. Which means the latest IIP data we have right now is for April 2026. And according to that, industrial production grew 4.9% compared to the previous month (March 2026).

Still, because it captures short-term changes in economic activity, IIP gives us an early peek into broader growth trends long before the government releases its national accounts. So calling it a leading indicator isn’t exactly a stretch.

But before we get into how IIP can help you understand the economy, we first need to understand what it actually is and how it works.

See, IIP is pretty much what the name suggests. It’s a monthly gauge of India’s industrial sector that tells us whether factory output, mining activity, and electricity generation are rising or falling in volume terms, compared to a reference or base year.

In simple terms, it tries to answer a straightforward question: Are we producing more goods and generating more power than before? That’s very different from indicators like inflation or nominal GDP, which tell you whether prices have gone up or down.

But how does IIP actually measure this?

Well, it starts with a large basket of industrial items spread across broad sectors like mining, manufacturing, electricity, and water supply. Every month, the MoSPI collects production data for these items to see how output is changing.

Now, not every item neatly fits into a one-month production cycle. Some take longer to produce. So in cases where the production period stretches beyond a month, the MoSPI uses value data for a few items instead.

Once that data comes in, the government compares current output with output from a reference year, known as the base year — which, right now, is 2022–23. This comparison gives us something called a “production relative”.

Each sector then gets a weight based on its importance. Right now for instance, manufacturing carries the heaviest weight at 76%.

Finally, the government multiplies the production relative by these weights and combines everything into one composite number. And that number is what we call the IIP.

If that felt too theoretical, let’s break this down with a simple example. Let’s imagine India’s industrial production depends on just two items: A and B.

The first thing the MoSPI would do is figure out how much of both items were produced. Let’s say item A recorded an output of 150 kg during the year, while item B clocked 1,200 litres.

Now, there’s an obvious problem here. You can’t really compare kilograms with litres. They’re completely different units.

So instead of comparing the numbers directly, the MoSPI compares each item’s output with its output in the base year — let’s assume FY23. Say A produced 100 kg back then, while B produced 1,000 litres.

This is where “production relative” comes in. Think of it as a way to standardise production numbers or simply 100 plus or minus the percentage increase or decrease in output.

So for item A, output has gone from 100 kg to 150 kg. That means its production relative becomes 150. For B, output has risen from 1,000 litres to 1,200 litres, so its production relative becomes 120.

But here’s the thing. Not every item matters equally to industrial production. So the next step is assigning weights based on importance. If item A is more important than B in the country’s industrial basket, it could get a weight of 60, while B gets 40.

Now the MoSPI multiplies these weights with the production relatives. For A, that gives you 9,000 (150 × 60). For B, it comes to 4,800 (120 × 40). Add them up and you get 13,800.

The final step is to divide this by the total weights, which is 100 in this case. And just like that, the final IIP comes to 138.

This simply tells you that industrial production is 38% higher than it was in FY23.

But if you noticed, the final number also depends heavily on the weights assigned to different items. In our example, A carried a bigger weight than B. Which means its increase had a much larger impact on pushing the IIP up than B’s smaller rise.

Now, the reason we’re talking about the IIP isn’t just because the government recently released the latest numbers. It also made a few important changes to how the IIP is calculated.

For starters, it has updated the base year from the decade-old 2011–12 to 2022–23. And that makes sense because industrial production today looks very different from what it did over ten years ago. Some items and sectors like magnetic strip cards and CCTV cameras may have emerged and become more important. Others, such as kerosene, fluorescent tubes, and sewing machines, may have become obsolete.

And as industries change, so does the importance of different sectors, which is why industry weights need a rethink too.

But perhaps the biggest change is how these weights will now work.

Remember how we said different sectors carry different weights in the IIP? Earlier, once these weights were fixed in the base year, they stayed unchanged for a decade or more until the next revision.

But industries don’t stand still for ten years. And that’s why the MoSPI has now adopted a more practical approach, where it can tweak sector weights every year as industries evolve.

“But why should I care about the IIP?”, you might wonder. After all, it has nothing to do with prices or how much you spend.

Here’s the thing though. IIP often moves before other economic indicators do, making it a bit like an early warning signal for the broader economy.

If you take one glance at the latest data, you’ll see that manufacturing and capital goods (things like machines, investment equipment, etc.) have been fairly strong. In fact, capital goods and infrastructure-related output grew by 9–11% year-on-year. That could signal more investments ahead and possibly more jobs too.

But the picture isn’t equally rosy everywhere. Consumer goods, for instance, have been weaker. Consumer non-durables such as everyday FMCG items grew by a measly 0.7% over the previous year. Which could suggest that households are still cautious about spending.

And that’s not all. This is exactly the kind of thing policymakers like the RBI keep a close eye on, which will ultimately trickle down to how you and I spend. Take the latest IIP data. Industrial growth picked up to 4.9% in April 2026 from 3.2% in March. Manufacturing growth came in at 6.2%, comfortably above the FY26 average of 4.9%. And capital goods have now clocked double-digit growth for four straight months.

This suggests that even if input costs rose because of the West Asia war, industries didn’t really cut output. Rather, they may have simply tweaked supply chains instead.

And that’s something the RBI will likely keep in mind while deciding interest rates this week. At least for now, IIP data doesn’t point to panic-driven rate hikes that could make borrowing more expensive for everyone. Unless of course inflation itself moves out of the RBI’s comfort zone.

Until then…

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