
What is the difference between SDLs, T-Bills, and G-Secs?
By: Akriti Tomar | Date : Nov 29, 25
Government securities come in different forms, and each serves a specific purpose for investors. Here’s a clear comparison to help you understand how State Development Loans (SDLs), Treasury Bills (T-Bills), and Government Securities (G-Secs) differ from one another.
Quick Comparison
| Basis | Treasury Bills (T-Bills) | Government Securities (G-Secs) | State Development Loans (SDLs) |
| Maturity | Short-term securities with maturities of 91 days, 182 days, or 364 days | Long-term securities with maturities ranging from 5 years to 40 years | Long-term securities similar to G-Secs, usually 5 years and above |
| Interest (Coupon) | No periodic interest. Issued at a discount and redeemed at face value | Pays semi-annual interest to your linked bank account | Pays semi-annual interest to your linked bank account |
| Investment Value | Always issued at a discount and redeemed at full face value | Can be issued at discount, par, or premium | Can be issued at discount, par, or premium |
| Issuer | Central Government via RBI | Central Government via RBI | State Governments via RBI |
| Risk Level | Lowest risk (backed by Central Govt.) | Very low risk (sovereign guarantee) | Low risk (state-backed) |
In Simple Terms
- T-Bills = Short-term, no interest, safe, discount-based.
- G-Secs = Long-term, interest-paying, very low-risk.
- SDLs = Long-term, interest-paying, slightly higher yield than G-Secs because they are issued by state governments.
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