Uncleared Margin Rules (UMR) Explained

The Uncleared Margin Rules (UMR) require counterparties to non-centrally-cleared derivatives, such as many bilateral interest rate swaps and FX derivatives, to exchange collateral (margin) against the risk those positions carry. UMR was developed as part of the G20's post-2008 derivatives market reforms and has been phased in globally over multiple years, extending margin requirements to a progressively wider set of market participants.

Why UMR exists

Before the 2008 financial crisis, a large share of the derivatives market was traded bilaterally over the counter, with many positions carrying little or no collateral to cover the risk that one party could fail to perform on the trade. When major counterparties such as Lehman Brothers and AIG ran into severe difficulty, the scale of uncollateralised derivatives exposure in the system became a significant source of contagion risk. In response, G20 leaders agreed a package of derivatives market reforms, including a push toward central clearing for standardised derivatives (covered in our guide to CCP clearing) and, for derivatives that remain outside central clearing, a requirement to post both initial and variation margin to reduce counterparty credit risk in the bilateral market.

Initial margin versus variation margin

UMR covers two distinct types of margin. Variation margin covers the day-to-day change in a derivative's mark-to-market value, and was required for a broad range of counterparties relatively early in the implementation timeline. Initial margin is a separate, forward-looking buffer calculated to cover the potential future exposure that could arise if a counterparty defaulted and the position had to be closed out over several days in stressed market conditions, similar in concept to the initial margin posted at a centrally cleared venue, but calculated and exchanged bilaterally between the two counterparties rather than through a central counterparty.

The phased implementation by counterparty size

Rather than applying to the entire market at once, UMR's initial margin requirement was phased in over several years, starting with the largest derivatives dealers and progressively capturing smaller market participants as their average aggregate notional amount of non-cleared derivatives crossed successively lower thresholds. This phased approach, often referred to by its implementation "phases," was designed to give the market's infrastructure, including custodians and collateral management systems, time to scale up to handle the operational complexity of bilateral initial margin exchange before extending the requirement to thousands of smaller buy-side firms in the later phases.

Operational complexity for smaller firms

Unlike variation margin, which most derivatives users were already accustomed to exchanging in some form, initial margin under UMR requires counterparties to use a standardised margin calculation methodology, agree legal documentation for segregated custody of the posted collateral, and establish operational workflows for daily margin calls, all of which represented a significant new operational burden, particularly for smaller asset managers and pension funds caught in the later implementation phases. Many smaller firms in these later phases found that their trading volumes, once properly calculated under the standardised methodology, kept them below the threshold requiring them to actually post initial margin, though they still needed to perform the calculation each year to confirm their exempt status.

FAQ

Does UMR apply to all derivatives?

No — it applies specifically to non-centrally-cleared derivatives. Derivatives that are centrally cleared through a CCP are instead subject to that CCP's own margin requirements.

Who calculates initial margin under UMR?

Both counterparties typically calculate initial margin independently using an industry-standard methodology, most commonly ISDA's Standard Initial Margin Model (SIMM), and reconcile any differences in their calculations.

Is UMR the same requirement in every jurisdiction?

The core framework follows the same G20-agreed principles globally, but implementation details and timelines have varied somewhat between major jurisdictions, including the US, EU, and UK.

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Custody and segregation requirements

A defining feature of UMR's initial margin requirement, distinguishing it from ordinary bilateral collateral arrangements, is that posted initial margin must be held with a third-party custodian in a segregated account, rather than held directly by the receiving counterparty. This segregation is designed to ensure that if the counterparty receiving the margin were to fail, the posting party's collateral would not simply become an unsecured claim in that counterparty's insolvency, but would instead be protected and returnable through the custodial arrangement. Setting up these segregated custody arrangements, including negotiating tri-party or third-party custodian agreements and account control documentation, was one of the more time-consuming operational workstreams firms faced when preparing for their UMR implementation phase, since it typically required coordination between legal, operations, and the custodian itself well ahead of the firm's compliance date.

Impact on derivatives market structure

By making non-cleared derivatives more operationally and financially costly relative to centrally cleared alternatives, UMR has reinforced the broader post-crisis trend of pushing standardised derivatives toward central clearing wherever possible, since centrally cleared trades avoid much of the bilateral margin and custody complexity UMR introduces. For the remaining pool of genuinely bespoke or non-standard derivatives that cannot be centrally cleared, UMR ensures a consistent baseline level of collateralisation across the market, reducing the kind of uncollateralised bilateral exposure that contributed to counterparty contagion risk during the 2008 crisis.