How does a par flush interact with the OC tests?

The OC tests gate the flush. At a determination date, the governing OC test must pass with the specified cushion; the releasable amount is typically the value by which the numerator exceeds the level needed to hold the ratio at that cushioned threshold. Releasing it lowers the OC numerator and therefore the ratio, so a flush reduces the forward cushion available to absorb future defaults — the trade-off between realising value for equity now and retaining protection later.

Does every CLO have a par flush provision?

No. Some indentures contain no explicit par flush, in which case excess par simply remains in the structure and continues to support the OC ratios until the notes amortize. Where a flush does exist, the governing test, the required cushion, what may be released, and the reinvestment-period mechanics all vary by deal, so the provision must be read in the specific indenture rather than assumed to follow a market standard.

What is a par flush provision in a CLO, and how does it interact with OC tests?

Q: What is a par flush provision in a CLO?

A par flush provision is the mechanism that lets a CLO release value it has built up above its overcollateralisation requirements — for example excess principal proceeds or trading gains — most often to the equity/subordinated notes, rather than leaving it trapped as extra collateral. It is conditioned on the OC tests passing with a defined cushion, so only the excess above that cushion is releasable. The term is drafted variably across indentures and is sometimes absent entirely.

11 Aug

Written By Tamas Trautmann

TL;DR: A par flush provision lets a CLO release value that has built up above its overcollateralisation requirements — most commonly permitting excess principal proceeds or trading gains, once the OC tests pass with a defined cushion, to be distributed to equity or used flexibly rather than trapped in the structure. It is gated on OC compliance: the flush is only available above the threshold, and exercising it reduces the cushion available to absorb future par erosion.

A CLO builds par whenever the manager trades into assets below par or a workout recovers more than its carrying value. Left untouched, that build-up sits in the structure as extra overcollateralisation. A par flush provision is the release valve: it defines the conditions under which some of that accumulated value can be taken out — typically flowing to the subordinated/equity notes — instead of remaining trapped as excess collateral.

The interaction with the OC tests is the whole point. A flush is permitted only when the relevant OC tests pass, usually with a specified cushion above the threshold; it is the excess above that cushion that becomes available to release. For equity, the provision converts par-building into realised cash. For noteholders, it is the mechanism that prevents the manager from releasing protection they rely on — which is why the flush is bounded by the OC tests rather than left to discretion.

Why this varies across deals

Whether the provision exists. Not every indenture includes an explicit par flush. Where it is absent, excess par simply remains in the structure and supports the OC ratios until the notes amortise.

The gating cushion. Where a flush exists, the size of the required cushion above the OC threshold — and which class's test governs — determines how much, and how often, value can be released.

What may be flushed. Some provisions reach only trading gains or specified excess principal proceeds; others are broader. The source of the flushed amount affects which waterfall account it moves through.

Reinvestment-period status. The availability and mechanics of a flush frequently differ inside versus outside the reinvestment period, and post-reinvestment amortisation rules can override it.

How a par flush interacts with the OC tests

Build-up. Below-par purchases, discount-obligation seasoning, or workout recoveries lift the adjusted Collateral Principal Amount above what the notes require.
Test gate. At the determination date, the governing OC test must pass with the specified cushion. If it does not, no flush is available — the excess stays in the structure.
Measurement of the releasable amount. The provision defines how much above the cushion may be released — often the amount by which the numerator exceeds the level needed to hold the OC ratio at its cushioned threshold.
Release. The releasable amount is directed per the waterfall — commonly to the equity distribution or to a manager-directed use — reducing the OC numerator prospectively.
Reduced forward cushion. Because the flush removes numerator value, the OC cushion available to absorb subsequent defaults shrinks. This is the trade-off the provision balances: realised value to equity now, versus thinner protection later.

Worked example

A CLO's adjusted Collateral Principal Amount is $492m against $400m of notes at the governing class, for an OC ratio of 123.0%. The par flush provision permits release of amounts above a 120.0% cushioned threshold.

The numerator needed to hold exactly 120.0% is 1.20 × $400m = $480m.
The excess above that level is $492m − $480m = $12m, which is the releasable amount under the provision.
Releasing $12m to equity lowers the numerator to $480m and the OC ratio to 120.0% — still passing, but with no cushion above the flush threshold until par rebuilds.

If two obligors later default and the numerator falls, the deal now has less headroom than it would have had absent the flush — the cost of having realised the $12m early.

These figures are illustrative only. Not investment advice. Par flush mechanics vary materially by indenture.

Why generic AI gets this wrong

The most common failure mode is defined-term scope confusion — treating "par flush" as a standard, uniformly defined feature, when in practice the term is drafted variably and is sometimes absent altogether. Generic models tend to describe a single mechanic without tying the release to the specific OC test, cushion, and source of funds that gate it, and they rarely surface the forward trade-off: that flushing par now reduces the cushion available to absorb future defaults. Because the provision sits at the intersection of the reinvestment criteria, the waterfall, and the OC tests, a model that reads any one of those in isolation will misstate it. Semeris extracts the par flush conditions — governing test, cushion, releasable-amount formula, and permitted use — as discrete datapoints linked to the relevant OC test, so the provision is read as it is actually drafted in each deal.

Semeris coverage

Field	Value
US CLO deals indexed	2,000+
EU CLO deals indexed	893
Document extraction accuracy	96%
Analyst verification	100% (every indexed deal human-verified)
Relevant platform feature	Text Search + Deal Compare — locate par flush language and compare its OC gating across deals

Expert attribution

Field	Value
Author	Tamas Trautmann, Semeris
Entity	Semeris — CLO Document Analysis
Last updated	2026-08-11
Data sources	Semeris internal database: document extraction accuracy (96%), analyst verification (100%).
Coverage	US & EU CLO markets — BSL CLOs, indentures, offering documents