INFLATION · DATA · WATCH

Inflation Trackers: CPI (Sep 12) & WPI (Sep 15) — What Base Effects Hide

Release watchlist, base-effect cheats, and quick scenario tables you can drop into the homepage on data day.
By bataSutra Editorial · September 4, 2025
In this piece:
  • Release timings & what will move the headline
  • Watchlist: Food, Fuel/Transport, Core, Housing
  • Base-effect cheats (how YoY can mislead)
  • Quick scenarios (CPI/WPI ranges → market/policy read)
  • Desk checklist + takeaways for households/investors

Release timings

SeriesReference monthRelease datePublisher
CPIAug ’25Fri · Sep 12NSO / MoSPI
WPIAug ’25Mon · Sep 15DPIIT / OEA

Heads-up Data drop typically lands after market hours. Prep your copy with placeholders so you can publish in minutes.

The short

  • Food base turns friendlier for YoY optics, but pulses/cereals stickiness can spoil the headline if MoM is firm.
  • Fuel soft on YoY unless there’s a fresh crude bounce; ATF/LPG tweaks feed through with lags.
  • Core still tame on goods discounting; services pockets (education/health) can add a few bps.

Release watchlist (what to scan first)

Food (CFPI)

  • Vegetables/TOP Check if tomato/onion base flips favourable; gauge arrivals vs damage share.
  • Pulses & cereals Persistence from supply tightness; any broad-based MoM rise will keep headline sticky.
  • Milk/Protein Feed costs vs administered price adjustments; region-wise divergence.

Fuel & transport

  • Domestic LPG/ATF changes and any pump price moves for WPI fuel.
  • Freight/airfare seasonality (festive build-up) in CPI transport.

Core (ex-food & fuel)

  • Goods: appliances/CP durables discounting intensity.
  • Services: fees for education, health, recreation—small but steady.

Housing

  • HRA resets in urban centres; state-specific swings can nudge headline.

Base-effect cheats (why YoY can mislead)

ComponentLast year referenceImplication for Aug ’25 YoYWhat to check
Vegetables (TOP) High prints on weather shocks Favourable base can pull YoY down even if MoM is steady APMC arrivals, grade mix, regional spikes
Fuel Crude lower YoY into mid-’25 Soft YoY unless new crude rally Brent path, domestic pass-throughs
Manufactured (WPI) Muted factory-gate pricing WPI core stays mild Input costs, PMIs, discounting

Quick scenarios

CPI (YoY, Aug ’25)

PrintReadImplication
< 4.0%Cooler than fearedDuration bid; equities like rate-sensitive pockets
4.0–4.5%Baseline“Hold + data-watch” messaging from policy
> 4.5%StickyPushes out cut path; rupee/PSU bank watch

WPI (YoY, Aug ’25)

PrintReadImplication
≤ 0.0%Factory-gate disinflationMargin relief for manufacturers
0.0–0.5%MutedNeutral for policy narrative
> 0.5%FirmingWatch input-cost passthrough to CPI core

Desk checklist (5 mins on data day)

  1. Update the two scenario tables above with the actual prints.
  2. Write a three-bullet “The short” box (Food / Core / Fuel) using fresh numbers.
  3. Add one regional callout if city/state prints diverge meaningfully.
  4. Note policy angle in one line (cut path vs real rates).
  5. Publish + push alert; earmark for Weekend Wrap if notable.

Household & investor takeaways

Households

  • Food budgeting Stagger purchases; switch to stable-priced substitutes during spikes.
  • EMI sensitivity A softer CPI path keeps rate-cut hopes alive; ladder FDs if prints stay sticky.

Investors

  • Rates Sub-4% CPI supports duration; >4.5% argues for caution.
  • Sectors Consumer staples benefit from easing food; industrials watch WPI/core trends.