State development loans

When you buy a 10-year government bond through RBI Retail Direct, the auction screen shows two kinds of paper. One is issued by the central government. The other, usually offering a noticeably higher yield, is a state development loan, or SDL bond: money borrowed by a state like Maharashtra, Tamil Nadu, Karnataka or Gujarat. In the third week of September 2026, the weighted average cut-off on state bonds came in at 7.83%, about 0.71% above the 10-year central government bond.

Most retail investors I know ignore that gap for one of two opposite reasons. Half assume a state government bond is basically the same as a central government bond, so why bother. The other half hear “state government” and think of a broke municipal corporation that might not pay. Both pictures are wrong, and the market prices the truth somewhere in between.

What a state development loan actually is

States borrow for the same reason the centre does: their spending runs ahead of their tax collections. Every Tuesday, the RBI runs an auction where states raise money, typically Rs 15,000 to 20,000 crore in a single week across a dozen or more issuers. These bonds are called State Development Loans, dated securities, or state government securities. Same thing.

The mechanics are identical to a G-Sec. A fixed coupon paid half-yearly, a maturity date when the principal comes back, a listing on the exchange, and an RBI-managed auction where you can bid non-competitively through Retail Direct and get allotted at the weighted average price. The only difference is the borrower: a state government instead of the Government of India.

Why the extra yield exists

That 0.71% spread is not a credit rating in the usual sense. No Indian state has ever defaulted on an SDL. The RBI manages the borrowing programme, and the centre stands close enough behind states that the market treats default risk as close to zero.

The spread is mostly about liquidity and supply. G-Secs trade in huge size every day; you can exit a Rs 50 lakh position in minutes. SDL bonds trade thinly, and exiting early means accepting whatever price the few buyers offer. States have also been borrowing heavily, and heavy supply pushes the yield up. The spread has been wider than its old 0.25-0.50% range for a while now: it peaked near 0.85% in January 2026 and had eased to around 0.71% by September 2026, as demand improved.

So the extra 0.7% is a payment for two things: holding paper that is harder to sell mid-way, and absorbing a lot of state supply. If you plan to hold to maturity anyway, neither costs you anything, and the spread is close to free money.

What the headline yield hides

For SDLs, the interest is fully taxable at your slab rate, exactly like a G-Sec or an FD. There is no state-level tax break. At a 30% slab, a 7.83% SDL coupon is about 5.5% in hand. That still beats most FDs of the same tenure, but the comparison to make is after tax, not before.

How I think about buying them

If I want a 10-year locked return and I am sure I will not need the money mid-way, an SDL bought at auction through Retail Direct gives me roughly 0.7% a year more than the equivalent G-Sec for taking a risk that has never materialised. On Rs 10 lakh, that is Rs 7,000 extra a year, before tax, for reading one more line on the auction screen.

The one thing I would not do is buy an SDL in the secondary market for the yield and then expect to exit early. Thin trading means the exit price can eat a year of that extra spread in one bad week. Buy at auction, hold to maturity, and let the half-yearly coupons land. That is the entire trade.

Read: RBI Retail Direct

State bonds sit in an odd corner of the market: too illiquid for traders, too unfamiliar for most FD-minded savers. The 0.71% spread is the market’s standing offer to anyone willing to be neither.