Rate Cut Reversal: GST Reform and Long-Term Bond Supply Keep Yields on Edge

India’s bond market is sending a clear message: yields are rising, and rate cut hopes are fading. A combination of fiscal concerns triggered by proposed Goods and Services Tax (GST) reforms and increased supply of long-duration government securities has pushed benchmark yields to multi-month highs. The steepening of the yield curve reflects deeper anxieties about government borrowing, inflation control, and investor appetite for long-term debt.

Here’s a comprehensive look at the forces driving this shift and what it means for markets, policymakers, and investors.

Key highlights from the bond market

- The benchmark 10-year government bond yield surged 10 basis points to 6.50 percent, its sharpest single-day rise since October 2023  
- The 30-year G-Sec yield climbed to 7.23 percent, widening the spread between 10-year and 30-year bonds to a near four-year high  
- The steepening yield curve signals growing fiscal concerns and supply pressure from long-tenure bonds  
- The GST rate cut proposal is estimated to cause a revenue loss of Rs 1.8 trillion over 12 months, or 0.5 percent of GDP  
- S&P’s sovereign rating upgrade to BBB was overshadowed by market fears of fiscal slippage  

GST reform: a fiscal balancing act

Prime Minister Narendra Modi’s Independence Day announcement of a GST overhaul has sparked both optimism and caution. The proposed shift to a simplified two-tier structure of 5 percent and 18 percent, with a 40 percent slab for sin goods, aims to streamline taxation and reduce consumer inflation. However, the revenue implications are significant.

According to IDFC First Bank, the Centre’s net revenue loss is projected at 0.15 percent of GDP, while states may bear a heavier burden of 0.36 percent. This imbalance has raised concerns about increased borrowing by state governments, especially in the second half of the fiscal year.

The GST Council is expected to take up the proposal in its September or October meeting. Until then, uncertainty around implementation and fiscal impact will continue to weigh on bond markets.

Supply pressure at the longer end

The surge in long-duration bond yields is not just about GST. The government’s borrowing calendar indicates a heavier concentration of issuances at the longer end of the curve. This has led to a supply glut, with investors demanding higher yields to absorb the increased volume.

The spread between 10-year and 30-year bonds touched 82 basis points in mid-August, reflecting the market’s discomfort with long-term fiscal risks. Traders and fund managers are recalibrating their portfolios, favoring shorter tenures and inflation-protected instruments.

Muted impact of S&P rating upgrade

India’s long-awaited upgrade by S&P Global Ratings to BBB from BBB- was expected to boost investor sentiment and lower borrowing costs. However, the timing of the GST announcement diluted its impact. Gains from the rating upgrade were wiped out within a day, as bond yields reversed course.

S&P cited strong macro fundamentals, policy continuity, and fiscal discipline as reasons for the upgrade. Yet, the bond market’s reaction suggests that investors remain skeptical about the government’s ability to balance growth with fiscal prudence.

Rupee and equity market reactions

While bond markets turned cautious, the rupee appreciated by 21 paise to settle at 87.35 per dollar, tracking gains in equities. The Sensex rose 0.84 percent, buoyed by expectations of lower inflation and consumer-friendly tax reforms. However, analysts warn that equity optimism may be short-lived if fiscal slippage becomes evident.

What to watch next

- GST Council’s decision on rate rationalisation in September or October  
- Government’s borrowing schedule for the second half of FY26  
- RBI’s stance on inflation and rate cuts in its next monetary policy review  
- Investor appetite for long-duration bonds amid rising yields  

The current bond market dynamics reflect a tug-of-war between reform-driven optimism and fiscal caution. As India navigates its GST overhaul and borrowing needs, yields are likely to remain elevated, especially at the longer end of the curve.

Sources: Business Standard, Financial Express, Economic Times, Union Bank of India Research, Indian Express, Moneycontrol