Treasury Bills in India: Complete Guide for Short-Term Parking

Quick answer: Treasury Bills (T-Bills) are short-term, zero-coupon debt instruments issued by the Reserve Bank of India (RBI) on behalf of the Government of India. Available in three standard tenures—91 days, 182 days, and 364 days—they are issued at a discount to face value and redeemed at par (Rs. 100). The return comes entirely from the difference between the discounted purchase price and the redemption value. Backed by sovereign authority, T-Bills carry no credit risk premium and serve as the conventional risk-free benchmark for money markets. Retail investors can participate directly with a minimum allocation of Rs. 10,000 via RBI Retail Direct, stockbrokers, or Online Bond Platform Providers (OBPPs).

Suppose you have parked Rs. 5 lakh from an annual bonus, an asset sale, or business cash flow that you need to deploy in four months for an advance tax payment or property down payment. Leaving it in a standard savings bank account yields around 2.5% to 3.5% annually. Locking it into a short-term bank fixed deposit might involve premature withdrawal penalties or institutional counterparty exposure.

This is where Treasury Bills enter the picture. As money market instruments backed directly by the central government, T-Bills allow individuals and institutions to park surplus liquidity for defined horizons without taking on corporate credit risk. In this comprehensive guide, we unpack how T-Bills operate, how their discounting mechanism works, how their yields compare against traditional alternatives, and the exact process to buy them directly.

Key Takeaways

Issued by the RBI for the Government of India: T-Bills are sovereign debt instruments issued to finance short-term fiscal mismatches of the central government.
Standard tenures are 91, 182, and 364 days: Auctions take place weekly on Wednesdays through the RBI's electronic platform.
Issued at a discount, redeemed at par: T-Bills pay no periodic coupon interest; your gain is the spread between the discounted purchase price and the Rs. 100 face value.
Sovereign backing: Because the central government issues them, T-Bills carry the sovereign's credit profile and serve as a standard money market proxy for the risk-free rate.
Accessible retail minimums: Individual investors can bid with a minimum order size of Rs. 10,000 (and in multiples of Rs. 10,000 thereafter).
No TDS deducted: The RBI does not deduct tax at source on T-Bill gains, though all returns are taxed at your applicable income tax slab rate.
Multiple access routes: You can purchase new issues non-competitively through the RBI Retail Direct portal, stock exchanges (NSE/BSE), or selected secondary platforms.
Short-duration profile: With maturities under one year, T-Bills carry minimal sensitivity to broader interest rate cycles compared to long-dated government bonds.

What Are Treasury Bills and How Do They Work?

Treasury Bills, commonly abbreviated as T-Bills, are promissory notes issued by the Government of India under the statutory framework managed by the Reserve Bank of India. They represent short-term sovereign borrowing used to bridge temporary gaps between government revenues and expenditures.

Unlike regular dated government securities (G-Secs) or corporate bonds that pay periodic semi-annual interest, T-Bills are structured as zero-coupon instruments.

┌────────────────────────────────────────────────────────┐
│                   THE T-BILL MECHANISM                 │
│                                                        │
│  Purchase date:  You pay the discounted issue price    │
│                  (e.g. Rs. 98.30 per unit)             │
│                            │                           │
│                            ▼  Holding period: 91 days  │
│                                                        │
│  Maturity date:  Government redeems at full face value │
│                  (Rs. 100.00 per unit)                 │
│                            │                           │
│                            ▼                           │
│  Your return:    Rs. 1.70 per unit (100.00 − 98.30)    │
│                  Annualised implied yield: ~6.93%      │
└────────────────────────────────────────────────────────┘

When an investor acquires a T-Bill, no physical certificate is issued today; units are credited directly to your demat account or your Retail Direct Gilt (RDG) account. On the specified maturity date, the RBI automatically credits the full face value (Rs. 100 per unit) back into your linked primary bank account.

Why Does the Government Issue T-Bills?

Government tax collections—such as advance income tax, GST receipts, and direct corporate taxes—flow into the exchequer during specific calendar windows. However, government operational expenses, subsidies, and administrative costs run continuously.

To bridge this temporary liquidity timing gap without altering its long-term borrowing calendar, the central government issues short-term paper via weekly auctions conducted by the RBI. Note that state governments in India do not issue T-Bills; all State Development Loans (SDLs) are issued as dated securities.

Tenures, Auction Cycle, and Issuance Mechanism

The RBI issues Treasury Bills across three distinct tenures, each catering to different cash-management horizons:

Feature	91-Day T-Bill	182-Day T-Bill	364-Day T-Bill
Tenure	~3 months (91 days)	~6 months (182 days)	~12 months (364 days)
Auction Day	Every Wednesday	Every Wednesday	Every Wednesday
Settlement Day	Thursday (T+1 after auction)	Thursday (T+1 after auction)	Thursday (T+1 after auction)
Bidding Period (Retail)	Monday to Wednesday morning	Monday to Wednesday morning	Monday to Wednesday morning
Minimum Investment	Rs. 10,000	Rs. 10,000	Rs. 10,000
Interest Type	Zero-Coupon (Discounted)	Zero-Coupon (Discounted)	Zero-Coupon (Discounted)
Issuing Authority	Government of India (via RBI)	Government of India (via RBI)	Government of India (via RBI)

The Competitive vs Non-Competitive Bidding Process

T-Bill primary issuances use an electronic auction on the RBI's NDS-OM platform. The auction consists of two parallel segments:

Competitive Bidding (Institutional): Primary Dealers, scheduled commercial banks, mutual funds, and insurance companies submit specific price or yield bids. The RBI determines a cut-off price based on these bids.
Non-Competitive Bidding (Retail & Small Institutions): Individual retail investors do not need to forecast yields or bid a price. By entering a non-competitive bid through stock exchange platforms or RBI Retail Direct, retail participants are allocated units at the weighted average price or the cut-off price determined in the competitive auction. Up to 5% of the notified auction amount is reserved for non-competitive retail bidders.

How to Calculate T-Bill Yields

Because Treasury Bills do not carry an explicit coupon rate, evaluating their return requires converting the price discount into an annualised yield. To understand how this fits into broader debt calculations, see our primer on understanding bond yields.

The Implied Yield Formula

The annualised yield for a Treasury Bill is calculated using the standard money market formula:

Annualised yield (%) = [(F − P) ÷ P] × (365 ÷ D) × 100

Where:

Y = Annualised yield (in %)
F = Face value (Rs. 100)
P = Discounted purchase price (e.g. Rs. 98.25)
D = Tenure in days (91, 182, or 364)

Practical Calculation Example

Let us examine a real-world scenario involving a 182-day T-Bill:

Face value (F): Rs. 100
Cut-off price (P): Rs. 96.60
Tenure (D): 182 days
Total capital invested: Rs. 96,600 (for 1,000 units)

Let us compute the components:

Absolute return: Rs. 100 − Rs. 96.60 = Rs. 3.40 per unit
Holding-period return: (Rs. 3.40 ÷ Rs. 96.60) × 100 = 3.5197%
Annualised return: 3.5197% × (365 ÷ 182) = 7.058%

Upon redemption at day 182, the investor receives Rs. 1,00,000 directly in their linked bank account, realizing a pre-tax gain of Rs. 3,400 on an outlay of Rs. 96,600.

Treasury Bills vs Bank Fixed Deposits vs Liquid Funds

When parking short-term funds, retail investors commonly weigh T-Bills against institutional alternatives like short-tenure Bank Fixed Deposits and Liquid Mutual Funds. The table below illustrates the structural trade-offs between these instruments:

Parameter	Treasury Bills (T-Bills)	Bank Fixed Deposits (FDs)	Liquid Mutual Funds
Issuer / Backing	Government of India (Sovereign)	Commercial Bank (DICGC insured up to Rs. 5 lakh)	Portfolio of short-term debt & money market paper
Credit Profile	Carries no credit risk premium	Dependent on bank stability beyond Rs. 5 lakh	Subject to underlying corporate/bank issuer credit
Tenure Options	91, 182, 364 days	7 days to 10 years	Open-ended (holding horizon typically 1–90 days)
Pricing / Coupon	Discounted zero-coupon	Fixed interest rate	Market-linked Net Asset Value (NAV)
Premature Exit	Tradable on secondary market (subject to liquidity)	Allowed with penalty (typically 0.5%–1.0% cut in rate)	Redeemable on any business day (exit load applies first 7 days)
TDS Deduction	No TDS	10% TDS if annual interest exceeds Rs. 50,000 (Rs. 1,00,000 for seniors)	No TDS for domestic resident individuals
Minimum Ticket	Rs. 10,000	Rs. 1,000 (varies by bank)	Rs. 500 to Rs. 5,000
Tax Treatment	Slab rate (Income from Other Sources / STCG)	Slab rate (Income from Other Sources)	Slab rate (Specified Mutual Funds as STCG)

Key Trade-Off Insights

If an investor prioritises counterparty safety for amounts exceeding the Rs. 5 lakh DICGC deposit insurance limit, T-Bills eliminate institutional default exposure. For a detailed structural comparison of debt instruments, see our analysis on bonds vs fixed deposits.

Conversely, if an investor requires unpredictable, partial withdrawals on three days' notice, a liquid mutual fund or a sweep-in deposit offers operational flexibility that a fixed-tenure T-Bill does not provide without executing a secondary market trade.

Taxation of Treasury Bills in India

Understanding the tax implications of T-Bills ensures accurate post-tax yield comparisons.

Nature of Gains: Capital Gains vs Other Sources

Under the Indian Income-tax Act, 1961, the taxation of T-Bills has historically centered on the interpretation of the discount:

Held to Maturity: When held until maturity, the difference between the issue price and the redemption value (Rs. 100) is treated as short-term capital appreciation or income from other sources and is taxed at the investor's applicable marginal income tax slab rate.
Sold in the Secondary Market Before Maturity: If an investor sells a T-Bill on an exchange prior to maturity, any difference between the purchase price and sale price is classified as Short-Term Capital Gains (STCG), given that all T-Bill tenures are 364 days or fewer. STCG is added to your total income and taxed at your marginal slab rate.

For a broader perspective on debt taxation changes, refer to our guide on capital gains tax on bonds in India.

┌────────────────────────────────────────────────────────┐
│               TAX SUMMARY FOR T-BILLS                  │
│                                                        │
│  Holding period:        Always 364 days or fewer       │
│  Tax classification:    Short-term capital gain (STCG) │
│  Applicable tax rate:   Investor's marginal slab rate  │
│  TDS deduction:         Nil (0%)                       │
│  Advance tax liability: Investor must self-assess      │
└────────────────────────────────────────────────────────┘

No Tax Deducted at Source (TDS)

Unlike bank fixed deposits or corporate Non-Convertible Debentures (NCDs), the RBI does not deduct TDS when paying the maturity proceeds of T-Bills. While this enhances compounding during the investment period because the entire gross amount lands in your account, investors must account for the liability when calculating their quarterly advance tax obligations to avoid interest penalties under Sections 234B and 234C.

How to Invest in Treasury Bills: Step-by-Step

Retail investors in India have three primary avenues to purchase T-Bills:

                   CHANNELS TO BUY T-BILLS
                              │
        ┌─────────────────────┼─────────────────────┐
        ▼                     ▼                     ▼
RBI Retail Direct       Stockbrokers           Online Bond
 (no brokerage)       (Zerodha, Groww)     Platform Providers

Option 1: RBI Retail Direct Scheme (Direct Central Bank Account)

The RBI Retail Direct scheme provides a zero-fee route for individual retail investors to access primary government securities auctions.

Open an Account: Visit rbiretaildirect.org.in and complete the digital KYC process with your Aadhaar, PAN, and cancelled cheque to establish a Retail Direct Gilt (RDG) account.
Access the Primary Auction: Log into the portal on Monday or Tuesday when the weekly T-Bill auction window is active.
Select Tenure and Place Bid: Choose between the 91-day, 182-day, or 364-day issue. Enter the bid amount in multiples of Rs. 10,000.
Authorize Payment: Fund the bid via UPI or Net Banking (ASBA-style blocking).
Allotment and Settlement: Once the RBI finalises the auction cut-off on Wednesday, the allotment is confirmed, and units are credited to your RDG account on settlement day (Thursday). Excess funds (the discount amount) are unblocked or refunded to your primary bank account.

To learn more about setting up accounts across platforms, see our guide on how to invest in bonds.

Option 2: Through Stockbrokers (NSE goBID / BSE Direct)

Most leading retail brokerages (including Zerodha, Groww, Upstox, and ICICI Direct) provide integrated interfaces connected to the exchange non-competitive bidding windows:

Navigate to the "Govt Bonds / G-Sec" section of your broker's platform.
Select the active T-Bill auction before Wednesday morning.
Enter your bid amount (minimum Rs. 10,000). The broker blocks the full face value upfront.
Post-auction, units are credited directly to your regular CDSL/NSDL demat account, and the discount refund is credited back to your trading or bank account.

Option 3: Secondary Market Purchases via OBPPs

Investors who wish to purchase seasoned T-Bills with broken tenures (e.g., a 364-day bill that has 42 days left until maturity) can acquire them on the secondary market via SEBI-registered Online Bond Platform Providers or exchange order books.

Common Mistakes Treasury Bill Investors Make

Assuming T-Bills Pay Periodic Interest: Novice investors sometimes expect quarterly or semi-annual payouts. T-Bills are strictly zero-coupon instruments; all returns are realised only upon maturity when the full face value is paid.
Overlooking Secondary Market Liquidity Constraints for Retail Lots: While institutional secondary trading in sovereign paper exceeds tens of thousands of crores daily, retail-sized lots (under Rs. 25 lakh) on exchange order books can experience wider bid-ask spreads. If you foresee needing the funds before maturity, matching the exact maturity date upfront (e.g., picking a 91-day bill over a 364-day bill) is generally more cost-efficient than selling small lots early on the exchange.
Failing to Account for Advance Tax: Because T-Bills carry zero TDS at redemption, investors occasionally forget to factor the gains into their advance tax calculations, leading to unexpected statutory interest charges at year-end.
Neglecting the Opportunity Cost in Multi-Year Horizons: T-Bills are structured for short-term liquidity management. Utilizing rolling 91-day T-Bills for long-term goals (such as retirement portfolios 10 years out) introduces substantial reinvestment risk, as yields fluctuate with monetary policy cycles.

Frequently Asked Questions

What is the minimum and maximum amount one can invest in T-Bills?

The minimum investment in Treasury Bills is Rs. 10,000 (face value), and bids increase in multiples of Rs. 10,000 thereafter. Under the non-competitive bidding facility for retail investors, the maximum single bid per auction is capped at Rs. 2 crore (face value).

Can an investor exit a Treasury Bill before maturity?

Yes. T-Bills credited to a demat account can be sold on the secondary market via stock exchanges (NSE/BSE) through a registered broker or an OBPP. Alternatively, holders using RBI Retail Direct can trade on the NDS-OM secondary market platform. However, retail liquidity may vary, and selling prior to maturity subjects the trade to the prevailing market yield on that day.

Are Treasury Bills subject to credit rating requirements?

No. Treasury Bills are sovereign debt instruments issued directly by the central government and managed by the Reserve Bank of India. In the domestic currency debt market, sovereign paper does not carry or require a commercial credit rating because it represents the sovereign benchmark against which other debt is evaluated.

How do T-Bills differ from Cash Management Bills (CMBs)?

Both are short-term zero-coupon sovereign instruments issued at a discount. However, while T-Bills follow a fixed, predictable auction calendar across standard maturities (91, 182, and 364 days), Cash Management Bills (CMBs) are non-standard instruments issued on an ad-hoc basis for flexible durations (often under 91 days) to manage sudden, temporary cash requirements of the government.

Does a NRI have permission to invest in Indian Treasury Bills?

Yes. Non-Resident Indians (NRIs) can invest in Government of India Treasury Bills through the non-competitive bidding route using their NRE or NRO accounts, subject to Foreign Exchange Management Act (FEMA) guidelines and applicable depository procedures.

How is the purchase price determined for a retail bidder?

Retail participants submit non-competitive bids, meaning they do not specify a price. The purchase price is determined by the cut-off price established during the competitive auction among primary dealers and institutional participants. The investor pays this cut-off price, and any difference between the initial blocked application amount (usually face value) and the actual discounted price is refunded upon allotment.

The Bottom Line

Treasury Bills provide Indian investors with a transparent, sovereign-backed mechanism to park short-term capital across 91-day, 182-day, and 364-day horizons. By operating on a zero-coupon discount model, they eliminate periodic payout management while providing direct access to the domestic money market's risk-free benchmark.

Whether accessed through RBI Retail Direct, traditional brokerage accounts, or secondary bond platforms, T-Bills suit cash-parking strategies where capital stability and credit certainty outweigh the need for intraday liquidity. By aligning the chosen T-Bill tenure with your upcoming financial commitments, you can manage idle liquidity efficiently without taking on private corporate risk.

Disclaimer: This post is for educational purposes only. BondDekho is not a SEBI-registered investment adviser. Yields and risks mentioned are illustrative; consult a SEBI-registered adviser before making any investment decision.