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US Treasury Clearing’s Rule shifts from regulation to implementation
22 Jul 2026
Three years after the US Securities Exchange Commission embraced mandatory central clearing for the majority of the US Treasury market, Tahlia Kraefft explores how firms have changed their approach from questioning the necessity of it to how they will effectively enforce it
Image: nateejindakum/stock.adobe.com
After many years of predominantly bilateral trading, the world’s deepest government securities market is readying itself for one of the largest structural changes in recent times. Compulsory central clearing of large parts of the US Treasury markets is reforming operational models across custodians, clearing banks, broker-dealers, and technology providers, with asset servicers becoming core facilitators of the move.
Since the US Securities Exchange Commission (SEC) first issued a proposal on 14 September 2022, to develop central clearing to the US Treasury Market, it has imposed dates for mandatory central clearing of transactions in US Treasuries for eligible cash transactions as of 31 December 2026, and 30 June 2027 for eligible repo transactions.
Enhancing market resilience against liquidity crises
The SEC’s US Treasury clearing mandate was introduced to strengthen the world’s largest government bond market against systematic shocks and contagion. From a disconnected, bilateral system which was fragile during major stress, the rule changes the system towards standardised, centrally cleared transactions. Despite being recognised as the deepest and most liquid bond market in the world, and despite US Treasuries being a safe-haven assets for investors, it has been susceptible to major disruptions such as volatility in March 2020. This showed that liquidity is elusive even in this bond market during a crisis and the US is not invulnerable to market disorder.
At the beginning of the Covid-19 pandemic, the intermediation abilities of conventional dealers were overcome by a steep market rush which led to Treasury prices drastically falling. The failure of any party to deliver securities or cash due to the opacity of bilateral trading systems had a flow on effect through the financial networks, leading to unusual Federal Reserve mediation.
The key objectives of the Rule include decreasing counterparty risk through a central counterparty (CCP) — mostly the Fixed Income Clearing Corporation (FICC) — who sits in between buyers and sellers. The corporation acts as the buyer to seller and vice versa, and if the initial participant defaults, the CCP’s mutualised default resources protect the wider market from contagion.
An Investment Company Institute spokesperson describes the Treasury Clearing Rule as incredibly significant due to it moving a mostly bilateral market to central clearing. “However, unlike prior clearing initiatives, the Treasury Repo Clearing Mandate does not have non-US equivalents and so there has not been the same level of globally aligned preparation. As the global implementation process begins in earnest, new impediments inevitably surface and approaches need to be adjusted.
The spokesperson says while central clearing can diminish risk and enhance market efficiency, it highlights a major structural change for a global market, requiring firms to establish new clearing arrangements and coordinate implementation across legal frameworks.
Gaël Delaunay, head of collateral management, Clearstream emphasises the size and importance of the US Treasury market, and notes the impact of the US regulation going far beyond the US, due to the function of the US Treasuries as both an investment asset and a source of collateral in funding markets globally.
Banks, asset managers, custodians, triparty agents and financing participants across international markets are also affected in addition to US market participants.
“Any transaction involving US treasuries that falls within the scope of the rule, whether outright or repo-related, must be reviewed through the lens of the clearing mandate. The core regulatory change is the requirement to centrally clear eligible US treasury cash and repo transactions.
Despite being straightforward in conception, implementation has shown to be more complicated in international financing markets where US treasuries are often used as one component of broader collateral pools rather than being the primary asset being financed, Delaunay notes:
“The reform is therefore not simply a clearing initiative. It has implications for trading models, collateral management practices, funding strategies, and post-trade operating models across the global securities financing ecosystem.”
The drive toward central clearing in US Treasury markets is depicted as a story of enhanced transparency, less counterparty risk, and more rigid controls, remarks Oliver Blower, CEO of VoxSmart. He says this is definitely a welcome development following the painful lessons of the 2008 financial crisis.
“However, there is a growing risk that the industry is mistaking structural reform for front office improvement. Clearing makes markets safer, but it does not necessarily make them smarter.
“Spend any time on a rates desk and this becomes obvious. A significant portion of trading activity, particularly in swaps, still relies on human communication. Prices are negotiated, instructions are given and trades are agreed through a mixture of voice calls, chat messages, and fragmented workflows. That has not changed as quickly as the market structure around it.”
“This matters because the biggest risks in rates trading today are often not counterparty defaults. They are execution errors, misunderstandings, and delays in booking trades.”
Market preparedness
Firms still require additional guidance before compliance can be fully implemented, according to an ICI spokesperson, with many components of the clearing mandate interrelated and contingent on each other.
The ICI spokesperson is calling for an extension to the compliance date to assist the industry.
They argue specific international legal uncertainties should be addressed to avoid compounding delays including documentation frameworks being settled, at which point onboarding processes can meaningfully commence.
“This onboarding must be largely complete before operational infrastructure can be built, tested, and integrated. Legal opinions cannot be finalised until each of the above stages has progressed to a sufficient degree of certainty. These tight sequencing constraints render compliance by the compliance date very challenging.”
The spokesperson argues extra SEC guidance will be required which the agency has indicated in the regulatory agenda that it is working on. The agency submitted a comment letter to the US regulatory body in May discussing some of these issues linked to an exemption for certain non-US transactions.
Clearstream’s Delaunay explains that in terms of implementation, market participants are currently predominantly prioritising operational readiness and client onboarding for cash-trades and single-ISIN repos: “Nonetheless, more complex transactions such as triparty repos containing mixed collateral baskets remain a point of attention.”
One of the principal challenges is identifying whether a transaction is principally intended to finance US Treasuries, and consequently sits within the scope of the clearing mandate, or if US Treasuries are purely being mobilised as eligible collateral within a wider financing transaction, Delaunay continues.
“This distinction is particularly relevant for triparty repo baskets and remains an area of ongoing industry dialogue with regulators.
Operating model decisions is another area of where the market is still developing, he notes. Despite central clearing becoming compulsory for eligible transactions, custody and clearing do not need to be delivered by the same institution.
“We continue to see some uncertainty among market participants regarding how clearing obligations should be implemented operationally, particularly where providers offer integrated custody and clearing solutions.”
Custodians evolving their operating models
For asset servicers, adapting to the new guidelines is equally an operational shift as it is a compliance task, as they are principally changing their operating models to support clients during the change. Global custodians are becoming more central to the Treasury clearing ecosystem, an ICI spokesperson notes: “Custodians are adapting by scaling sponsored clearing models, upgrading margin management capabilities, and enhancing trade-capture facilities to support the shift to central clearing.”
According to Delaunary, one of the largest misconceptions in the market is that mandatory treasury clearing obliges clients to consolidate custody and clearing with the same provider: “In reality, custody, settlement, collateral management and clearing remain distinct functions, and clients can continue to hold their US Treasuries with their existing custodian while meeting their clearing obligations through the clearing provider of their choice.
He says consequently the function of global custodians is not fundamentally altering: “What is changing is the need to ensure seamless connectivity between custody, collateral management and the emerging clearing ecosystem. Clients should not be required to move assets or fundamentally redesign their custody arrangements simply because a trade becomes subject to mandatory clearing. Existing custody and settlement infrastructures remain fully capable of supporting US treasury activity alongside the new clearing requirements.”
Delaunary says the rule is ultimately having a flow-through impact on commercial and operating model choices throughout the industry.
“Some providers offer integrated custody and clearing solutions and are using the regulatory change as an opportunity to expand their footprint. This has created uncertainty among some market participants regarding whether they should adopt a bundled model or continue to use specialised providers for custody, collateral management, and clearing.”
Firms are putting a lot of funds into new post-trade workflows, connectivity to clearing members, collateral optimisation and settlement processes.
“The focus is less on custody itself and more on ensuring that collateral can move efficiently between custodians, counterparties, and clearing venues without creating operational friction.”
Delaunary anticipates by and by market will continue to facilitate both models. Vertically integrated solutions will be prioritised by some participants, while others will remain favourable of open architecture and the flexibility to choose best-in-class providers for custody, collateral management, and clearing independently.
“The success of either approach will depend on how effectively firms can mobilise collateral and connect the various components of the post-trade value chain.”
Strategic opportunities and operational challenges
Delaunay comments that the obstacles and opportunities for firms vary majorly based on where firms are positioned within the market structure.
The immediate challenges for market participants active in Treasury trading and financing is implementation. He recommends firms appoint clearing providers, create new operational processes, review legal documentation, and determine whether to maintain separate custody and clearing relationships or adopt more integrated models.
“The introduction of mandatory clearing also comes with additional costs, both in terms of implementation and ongoing clearing fees. At the same time, once clearing arrangements are in place, firms may benefit from increased netting efficiencies, enhanced margin optimisation, and lower capital consumption.”
He says a trend he is seeing is clients revisiting their collateral and trading strategies, with some firms reviewing collateral schedules and evaluating whether US Treasuries should be removed from certain mixed-collateral triparty baskets to prevent bringing those transactions within the scope of the clearing mandate.
Delaunay notes although it is still early, it highlights that the rule is already shaping business decisions far beyond clearing itself.
The reforms present a significant commercial opportunity for central counterparties and clearing providers, with traditionally clearing providers having had to tout the benefits of voluntarily cleared Treasury activity.
“Going forward, clearing becomes the market standard for a much larger share of Treasury transactions. Given the size of the US treasury and repo markets, the addressable market for clearing providers expands considerably, shifting the competitive focus toward service quality, operating model efficiency, and client experience.”
The picture is somewhat different for custodians, with a challenge Delaunary has observed, being continued uncertainty among various market participants regarding the relationship between custody and clearing.
“While clients can continue to maintain custody arrangements independently from their clearing relationships, some providers are actively offering bundled solutions that combine both services.
This creates pressure on custodians to demonstrate the value of open architecture models and seamless connectivity to multiple clearing providers.
An ICI spokesperson notes: “The strategic opportunity is to use the mandate as a catalyst for post-trade modernisation. The operational challenge is that the mandate is not a single system change. It is a front-to-back operating model change.”
Blower, explains the largest risk in rates trading today are frequently not counterparty defaults but instead are execution errors, misunderstandings, and delays in booking trades.
“These are the daily realities of the flotsam and jetsam of treasury markets. If something goes wrong, the dispute that follows is not so much about clearing, more about communication. Who said what, when, and how it was interpreted.”
He says the process of solving this can take days or weeks in some cases, while in the meantime, the investment bank may already have absorbed the loss.
“These risks can easily outweigh the regulatory fines that dominate so much of the public discussion. Yet they remain underappreciated because they sit in the grey area between front office execution, and back office control.”
According to Blower, clearing does nothing to fix this, it ensures that once trade is properly agreed and booked, the counterparty risk is managed.
“But it does not ensure that the trade was correctly understood in the first place. Nor does it guarantee that it is booked in a timely manner.
“This is where the next phase of market infrastructure needs to focus. Not just on how trades are cleared, but on how they are communicated, executed, and controlled in real time.”
Conclusion
Although derived from post-crisis resilience, the lasting impact of the Treasury Clearing Rule, may be the wider modernisation of market infrastructure. In the months leading up to the regulatory deadlines, custody providers have the opportunity to reconceive their function in reinforcing the world’s most systemically crucial market.
Since the US Securities Exchange Commission (SEC) first issued a proposal on 14 September 2022, to develop central clearing to the US Treasury Market, it has imposed dates for mandatory central clearing of transactions in US Treasuries for eligible cash transactions as of 31 December 2026, and 30 June 2027 for eligible repo transactions.
Enhancing market resilience against liquidity crises
The SEC’s US Treasury clearing mandate was introduced to strengthen the world’s largest government bond market against systematic shocks and contagion. From a disconnected, bilateral system which was fragile during major stress, the rule changes the system towards standardised, centrally cleared transactions. Despite being recognised as the deepest and most liquid bond market in the world, and despite US Treasuries being a safe-haven assets for investors, it has been susceptible to major disruptions such as volatility in March 2020. This showed that liquidity is elusive even in this bond market during a crisis and the US is not invulnerable to market disorder.
At the beginning of the Covid-19 pandemic, the intermediation abilities of conventional dealers were overcome by a steep market rush which led to Treasury prices drastically falling. The failure of any party to deliver securities or cash due to the opacity of bilateral trading systems had a flow on effect through the financial networks, leading to unusual Federal Reserve mediation.
The key objectives of the Rule include decreasing counterparty risk through a central counterparty (CCP) — mostly the Fixed Income Clearing Corporation (FICC) — who sits in between buyers and sellers. The corporation acts as the buyer to seller and vice versa, and if the initial participant defaults, the CCP’s mutualised default resources protect the wider market from contagion.
An Investment Company Institute spokesperson describes the Treasury Clearing Rule as incredibly significant due to it moving a mostly bilateral market to central clearing. “However, unlike prior clearing initiatives, the Treasury Repo Clearing Mandate does not have non-US equivalents and so there has not been the same level of globally aligned preparation. As the global implementation process begins in earnest, new impediments inevitably surface and approaches need to be adjusted.
The spokesperson says while central clearing can diminish risk and enhance market efficiency, it highlights a major structural change for a global market, requiring firms to establish new clearing arrangements and coordinate implementation across legal frameworks.
Gaël Delaunay, head of collateral management, Clearstream emphasises the size and importance of the US Treasury market, and notes the impact of the US regulation going far beyond the US, due to the function of the US Treasuries as both an investment asset and a source of collateral in funding markets globally.
Banks, asset managers, custodians, triparty agents and financing participants across international markets are also affected in addition to US market participants.
“Any transaction involving US treasuries that falls within the scope of the rule, whether outright or repo-related, must be reviewed through the lens of the clearing mandate. The core regulatory change is the requirement to centrally clear eligible US treasury cash and repo transactions.
Despite being straightforward in conception, implementation has shown to be more complicated in international financing markets where US treasuries are often used as one component of broader collateral pools rather than being the primary asset being financed, Delaunay notes:
“The reform is therefore not simply a clearing initiative. It has implications for trading models, collateral management practices, funding strategies, and post-trade operating models across the global securities financing ecosystem.”
The drive toward central clearing in US Treasury markets is depicted as a story of enhanced transparency, less counterparty risk, and more rigid controls, remarks Oliver Blower, CEO of VoxSmart. He says this is definitely a welcome development following the painful lessons of the 2008 financial crisis.
“However, there is a growing risk that the industry is mistaking structural reform for front office improvement. Clearing makes markets safer, but it does not necessarily make them smarter.
“Spend any time on a rates desk and this becomes obvious. A significant portion of trading activity, particularly in swaps, still relies on human communication. Prices are negotiated, instructions are given and trades are agreed through a mixture of voice calls, chat messages, and fragmented workflows. That has not changed as quickly as the market structure around it.”
“This matters because the biggest risks in rates trading today are often not counterparty defaults. They are execution errors, misunderstandings, and delays in booking trades.”
Market preparedness
Firms still require additional guidance before compliance can be fully implemented, according to an ICI spokesperson, with many components of the clearing mandate interrelated and contingent on each other.
The ICI spokesperson is calling for an extension to the compliance date to assist the industry.
They argue specific international legal uncertainties should be addressed to avoid compounding delays including documentation frameworks being settled, at which point onboarding processes can meaningfully commence.
“This onboarding must be largely complete before operational infrastructure can be built, tested, and integrated. Legal opinions cannot be finalised until each of the above stages has progressed to a sufficient degree of certainty. These tight sequencing constraints render compliance by the compliance date very challenging.”
The spokesperson argues extra SEC guidance will be required which the agency has indicated in the regulatory agenda that it is working on. The agency submitted a comment letter to the US regulatory body in May discussing some of these issues linked to an exemption for certain non-US transactions.
Clearstream’s Delaunay explains that in terms of implementation, market participants are currently predominantly prioritising operational readiness and client onboarding for cash-trades and single-ISIN repos: “Nonetheless, more complex transactions such as triparty repos containing mixed collateral baskets remain a point of attention.”
One of the principal challenges is identifying whether a transaction is principally intended to finance US Treasuries, and consequently sits within the scope of the clearing mandate, or if US Treasuries are purely being mobilised as eligible collateral within a wider financing transaction, Delaunay continues.
“This distinction is particularly relevant for triparty repo baskets and remains an area of ongoing industry dialogue with regulators.
Operating model decisions is another area of where the market is still developing, he notes. Despite central clearing becoming compulsory for eligible transactions, custody and clearing do not need to be delivered by the same institution.
“We continue to see some uncertainty among market participants regarding how clearing obligations should be implemented operationally, particularly where providers offer integrated custody and clearing solutions.”
Custodians evolving their operating models
For asset servicers, adapting to the new guidelines is equally an operational shift as it is a compliance task, as they are principally changing their operating models to support clients during the change. Global custodians are becoming more central to the Treasury clearing ecosystem, an ICI spokesperson notes: “Custodians are adapting by scaling sponsored clearing models, upgrading margin management capabilities, and enhancing trade-capture facilities to support the shift to central clearing.”
According to Delaunary, one of the largest misconceptions in the market is that mandatory treasury clearing obliges clients to consolidate custody and clearing with the same provider: “In reality, custody, settlement, collateral management and clearing remain distinct functions, and clients can continue to hold their US Treasuries with their existing custodian while meeting their clearing obligations through the clearing provider of their choice.
He says consequently the function of global custodians is not fundamentally altering: “What is changing is the need to ensure seamless connectivity between custody, collateral management and the emerging clearing ecosystem. Clients should not be required to move assets or fundamentally redesign their custody arrangements simply because a trade becomes subject to mandatory clearing. Existing custody and settlement infrastructures remain fully capable of supporting US treasury activity alongside the new clearing requirements.”
Delaunary says the rule is ultimately having a flow-through impact on commercial and operating model choices throughout the industry.
“Some providers offer integrated custody and clearing solutions and are using the regulatory change as an opportunity to expand their footprint. This has created uncertainty among some market participants regarding whether they should adopt a bundled model or continue to use specialised providers for custody, collateral management, and clearing.”
Firms are putting a lot of funds into new post-trade workflows, connectivity to clearing members, collateral optimisation and settlement processes.
“The focus is less on custody itself and more on ensuring that collateral can move efficiently between custodians, counterparties, and clearing venues without creating operational friction.”
Delaunary anticipates by and by market will continue to facilitate both models. Vertically integrated solutions will be prioritised by some participants, while others will remain favourable of open architecture and the flexibility to choose best-in-class providers for custody, collateral management, and clearing independently.
“The success of either approach will depend on how effectively firms can mobilise collateral and connect the various components of the post-trade value chain.”
Strategic opportunities and operational challenges
Delaunay comments that the obstacles and opportunities for firms vary majorly based on where firms are positioned within the market structure.
The immediate challenges for market participants active in Treasury trading and financing is implementation. He recommends firms appoint clearing providers, create new operational processes, review legal documentation, and determine whether to maintain separate custody and clearing relationships or adopt more integrated models.
“The introduction of mandatory clearing also comes with additional costs, both in terms of implementation and ongoing clearing fees. At the same time, once clearing arrangements are in place, firms may benefit from increased netting efficiencies, enhanced margin optimisation, and lower capital consumption.”
He says a trend he is seeing is clients revisiting their collateral and trading strategies, with some firms reviewing collateral schedules and evaluating whether US Treasuries should be removed from certain mixed-collateral triparty baskets to prevent bringing those transactions within the scope of the clearing mandate.
Delaunay notes although it is still early, it highlights that the rule is already shaping business decisions far beyond clearing itself.
The reforms present a significant commercial opportunity for central counterparties and clearing providers, with traditionally clearing providers having had to tout the benefits of voluntarily cleared Treasury activity.
“Going forward, clearing becomes the market standard for a much larger share of Treasury transactions. Given the size of the US treasury and repo markets, the addressable market for clearing providers expands considerably, shifting the competitive focus toward service quality, operating model efficiency, and client experience.”
The picture is somewhat different for custodians, with a challenge Delaunary has observed, being continued uncertainty among various market participants regarding the relationship between custody and clearing.
“While clients can continue to maintain custody arrangements independently from their clearing relationships, some providers are actively offering bundled solutions that combine both services.
This creates pressure on custodians to demonstrate the value of open architecture models and seamless connectivity to multiple clearing providers.
An ICI spokesperson notes: “The strategic opportunity is to use the mandate as a catalyst for post-trade modernisation. The operational challenge is that the mandate is not a single system change. It is a front-to-back operating model change.”
Blower, explains the largest risk in rates trading today are frequently not counterparty defaults but instead are execution errors, misunderstandings, and delays in booking trades.
“These are the daily realities of the flotsam and jetsam of treasury markets. If something goes wrong, the dispute that follows is not so much about clearing, more about communication. Who said what, when, and how it was interpreted.”
He says the process of solving this can take days or weeks in some cases, while in the meantime, the investment bank may already have absorbed the loss.
“These risks can easily outweigh the regulatory fines that dominate so much of the public discussion. Yet they remain underappreciated because they sit in the grey area between front office execution, and back office control.”
According to Blower, clearing does nothing to fix this, it ensures that once trade is properly agreed and booked, the counterparty risk is managed.
“But it does not ensure that the trade was correctly understood in the first place. Nor does it guarantee that it is booked in a timely manner.
“This is where the next phase of market infrastructure needs to focus. Not just on how trades are cleared, but on how they are communicated, executed, and controlled in real time.”
Conclusion
Although derived from post-crisis resilience, the lasting impact of the Treasury Clearing Rule, may be the wider modernisation of market infrastructure. In the months leading up to the regulatory deadlines, custody providers have the opportunity to reconceive their function in reinforcing the world’s most systemically crucial market.
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