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If you have any experience at all with India’s money markets, you have likely come across Treasury Bills (T-Bills): zero-coupon, short-term instruments auctioned weekly by the RBI. However, there may be another sibling you’ve never heard of: cash management bills, or CMBs. On paper, CMBs and T-Bills may look similar, but their functions vary. T-Bills fund the government’s regular borrowing program. CMBs exist purely to plug sudden, short-term cash flow gaps, and they show up only when the need arises, not on any fixed date. If you are a treasury or fund manager trying to place surplus cash or just someone trying to figure out the RBI auction notices, this article walks you through what CMBs are, how the RBI issues them, and where exactly they diverge from T-Bills.
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What Are Cash Management Bills?
The Government of India, working with the RBI, launched Cash Management Bills to address the short-term cash inflow and outflow gaps. The first CMB was issued on May 12, 2010 [1], and the government issues these bills as and when the need arises to bridge the cash outflow and revenue inflow gap.
Cash Management Bills are structurally designed like Treasury Bills: they are issued at a price less than their face value, and the buyer receives the difference as a return when the bill matures. They have two distinctive features:
- Tenure: CMBs are always issued for under 91 days and in practice have run anywhere from 7 days up to 84 days.
- Schedule: There’s no pre-set calendar for CMBs. The RBI puts out a press release announcing the auction just one day ahead of the sale, once the government’s need becomes clear.
CMBs can be thought of as the government’s “bond overdraft facility.” In situations where the center faces a temporary cash crunch (for example, cash outflows occur before government cash inflows such as from tax collection), a CMB is used to fill the gap.
Cash Management Bills: Use Cases and Real Examples
The COVID-19 period provides a great case in point. On May 28, 2020, when government finances were under pressure due to pandemic expenses, approximately ₹80,000 crore [2] was raised through the issuance of an 84-day CMB. The auction attracted strong demand: Bids worth ₹3.45 trillion were received for the CMB, over 4 times the value on offer, with the cut-off yield settled at 3.288%, marginally above the then-prevailing yield on 91-day Treasury Bills of 3.20% [3]. This illustrated how demand for short-term, safe, and liquid instruments might spike during uncertain times.
CMBs have also been used to absorb excess liquidity. Following demonetization in November 2016, the RBI auctioned 35-day CMBs worth ₹60,000 crore under the government’s Market Stabilization Scheme (MSS) to absorb the massive influx of deposits that occurred after the withdrawal of ₹500 and ₹1,000 notes. CMB issuance continued into 2017, with the RBI eventually issuing ₹10.115 lakh crore [4] of CMBs under MSS during FY2016–17.
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How the RBI Auctions CMBs
The auction process broadly mirrors T-Bill auctions, with a few notable differences:
- The RBI gives just one day’s notice, specifying the amount and tenure based on the government’s immediate requirement.
- Bidding happens electronically on the RBI’s E-Kuber platform using a multiple-price auction method, where participants quote the yield they’re willing to accept.
- Settlement is fast; funds move, and bills are credited the very next working day (T+1).
- The non-competitive bidding facility available to retail participants in T-Bill auctions does not extend to CMBs, which is a big part of why retail participation stays negligible.
- Banks have an added incentive to buy CMBs: they qualify as eligible securities for meeting Statutory Liquidity Ratio (SLR) requirements under the Banking Regulation Act, 1949, making them a convenient short-term parking solution that also satisfies a regulatory need.
A quick note on ticket size: sources aren’t entirely consistent here. Some institutional-facing platforms cite denominations of ₹1 crore and multiples thereof, in line with typical wholesale money-market conventions, while a few retail-oriented explainers mention a much lower minimum. In practice, this difference matters less than it seems: since CMBs have no non-competitive bidding window, retail investors can’t access them directly regardless of the quoted minimum; participation is effectively restricted to banks, primary dealers, mutual funds, and insurers.
CMBs vs Treasury Bills: The Key Differences
Here’s where the two instruments genuinely diverge, side by side:
| Feature | Cash Management Bills (CMBs) | Treasury Bills (T-Bills) |
| Purpose | Meet temporary government cash-flow mismatches | Meet the government’s regular short-term borrowing needs |
| Issuance schedule | Issued as and when required; no fixed auction calendar | Issued according to a pre-announced auction calendar |
| Tenure | Less than 91 days | 91, 182, and 364 days |
| Retail/Non-competitive bidding | Not available | Available to eligible retail investors; NCB portion capped at 5% of notified amount |
| Notified size | Depends on the government’s temporary cash requirement | Determined under the regular borrowing programme and auction calendar |
| Predictability | Lower — issued at short notice when required | Higher — follows a published auction calendar |
| Primary use case | Temporary cash-flow management | Routine short-term government borrowing |
For some context about current size, RBI’s regular T-Bill auctions for 2026 have been more or less stable; a ₹24,000 crore auction was held on July 29, 2026, for 91-day, 182-day, and 364-day bills, and then again for ₹24,000 crore on August 5, 2026. CMBs have no pattern whatsoever and show up out of necessity. This is exactly why noticing one in the RBI’s press releases is worth noting.
What This Means for Market Participants
For a treasury desk and liquid fund managers, the bottom line is this: T-Bills are something you organize around, creating a laddered position for a known time frame. CMBs are something you react to; they are a brief opportunity to deploy cash to earn a decent return or a signal that the RBI is trying to manage liquidity in the system. Tracking CMB issuance patterns may also help you understand the government’s cash position at any point in the fiscal year; frequent or large CMB auctions often coincide with tight government cash balances, tax payment cycles, or unusual liquidity conditions.
Frequently Asked Questions
CMBs are aimed at institutional participants, with sources citing denominations ranging from ₹1 crore multiples to lower amounts. Either way, retail investors can’t access them directly since there’s no non-competitive bidding window.
No. Unlike T-Bills, CMBs don’t have a non-competitive bidding facility, so the RBI Retail Direct scheme doesn’t apply to them.
No. Both carry the sovereign guarantee of the Government of India, making them equally low-risk from a credit standpoint. The difference lies in tenure and predictability, not safety.
Like T-Bills, CMBs are zero-coupon instruments issued at a discount to face value. Your return is the difference between the discounted purchase price and the face value received at maturity.
Because CMBs exist specifically to address unplanned, short-term cash needs. Advance notice would work against their purpose; the RBI typically announces them just one day before the auction.
Yes, CMBs are tradable in the secondary money market, similar to T-Bills, giving holders an exit route if they need liquidity before the bill matures.
Sources
- https://dea.gov.in/files/public_debt_management_documents/Status%20Paper%20on%20Government%20Debt%20for%20%202023-24.pdf
- https://www.rbi.org.in/Scripts/BS_PressReleaseDisplay.aspx?prid=49853
- https://www.business-standard.com/article/finance/rbi-issues-cash-management-bills-worth-rs-80-000-cr-after-good-response-120052801785_1.html
- https://ficci.in/public/storage/sector/Report/20339/RBI_Annual_Report-2016-17.pdf
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