# Maximum Distributable Amount (MDA) & AT1 Coupon Caps Guide

> Calculate Basel RBC30 and EU CRD Article 141 Maximum Distributable Amount (MDA) quartiles (0%/20%/40%/60%), AT1/Tier 2 shortfalls, and dividend caps.

Canonical: https://finlexicon.org/wiki/maximum-distributable-amount-mda-cet1-stack-at1-coupon-stop
Last updated: 2026-11-14T22:44:58.920Z

**Publication:** FinLexicon Wiki
**Category:** Basel Iii Endgame Capital Ratios
**Published:** 2026-11-14T11:40:25.915Z
**Author:** Arthur Pendleton, CPA, JD (CPA, JD in International Banking & Basel Regulation)
**Reviewer:** Not recorded

## Answer-first summary

When a bank’s CET1 ratio falls inside its Combined Buffer Requirement (RBC30 / CRD Art. 141), automatic Maximum Distributable Amount quartiles cap common dividends, AT1 coupons, and variable bonuses.

## Key takeaways

- Excess Tier 2 capital can never fill an Additional Tier 1 shortfall; any AT1 or Tier 2 deficit diverts CET1 downward 1-for-1 and elevates the effective CET1 MDA trigger.
- Falling into the Combined Buffer Requirement restricts total payouts (dividends, buybacks, AT1 coupons, bonuses) to 60%, 40%, 20%, or 0% across four equal CBR quartiles.
- Under EU CRD Article 141, reporting zero or negative current-year profits while inside the CBR collapses the MDA dollar pool to zero even in the highest (60%) quartile.
- Within the MDA pool, banks possess legal discretion to prioritize paying ~$150M–$300M of annual AT1 coupons while cutting common dividends and bonuses to zero to protect wholesale funding access.

## Related financial entities

- **Basel III CET1 Capital Adequacy Standard** (BCBS-CET1) — license: International regulatory accord requiring Tier-1 common equity capital ratios, G-SIB surcharges, and liquidity buffers for banking institutions.
- **Total Loss-Absorbing Capacity (TLAC) & MREL Bail-In Debt Standard** (TLAC-MREL) — license: Total Loss-Absorbing Capacity (TLAC) & MREL Bail-In Debt Standard (TLAC-MREL) refers to an institutional financial benchmark and regulatory standard monitored by Financial Stability Board (FSB) (INTL), currently calibrated at 18.0% (Minimum RWA Ratio) as of October 2026.
- **U.S. G-SIB Surcharge Method 2 Systemic Capital Buffer** (GSIB-METHOD2) — license: U.S. G-SIB Surcharge Method 2 Systemic Capital Buffer (GSIB-METHOD2) refers to an institutional financial benchmark and regulatory standard monitored by Federal Reserve Board (US), currently calibrated at -40 bps (2026 Surcharge Cut) as of October 2026.

## Analysis

Hard-coded into Basel Framework chapter RBC30.4, EU Capital Requirements Directive Article 141, UK PRA Capital Buffers rules, and U.S. 12 CFR 217.11 ("Eligible Retained Income" payout limits), the **Maximum Distributable Amount (MDA)** acts as the automatic tripwire conserving Common Equity Tier 1 before a bank ever nears statutory insolvency. Breaching the top of the [Basel III CET1 Capital Adequacy Standard](/entity-index/basel-iii-cet1-standard) Combined Buffer Requirement immediately caps common dividends, share buybacks, [AT1 CoCo coupon payments](/wiki/at1-coco-contingent-convertible-writedown-vs-equity-triggers), and staff discretionary bonuses.

## How AT1 and Tier 2 Issuance Shortfalls Secretly Elevate the CET1 MDA Trigger

Investors frequently make the costly analytical error of summing only CET1 requirements (`4.5% Pillar 1 + CET1_P2R + CCB + G-SIB + CCyB`) when calculating a bank’s MDA trigger. Under Basel CAP10 and EU CRD Article 104a, Pillar 1 requires **1.50% AT1** and **2.00% Tier 2** (plus `18.75% AT1` and `25.00% Tier 2` shares of [ECB SREP Pillar 2R](/wiki/pillar-2r-vs-pillar-2g-srep-supervisory-capital-stacking)).

Whenever an institution under-issues AT1 or Tier 2 relative to those slices, **excess CET1 is automatically diverted downward to fill the Tier 1 and Total Capital shortfalls first**, rendering that CET1 unavailable to satisfy the Combined Buffer Requirement! Consequently, a 45 bps AT1 shortfall raises the effective CET1 MDA trigger point-for-point by +45 bps, as emphasized in our [Basel III Endgame & CET1 cornerstone guide](/wiki/bcbs-d424-basel-iii-endgame-cet1-output-floor-guide).

![Maximum Distributable Amount CET1 stack derivation including AT1 and Tier 2 bucket shortfall adjustments](/api/figure?type=flow&title=True%20Binding%20MDA%20Threshold%20%26%20Quartile%20Payout%20Engine&subtitle=Accounting%20for%20AT1%2FTier%202%20bucket%20shortfalls%20before%20measuring%20CBR%20quartiles&steps=1.%20Base%20CET1%20Floor%3A%3ASum%204.50%25%20Pillar%201%20CET1%20%2B%2056.25%25%20x%20P2R%20%28e.g.%20%2B1.125%25%20on%202%25%20P2R%29%7C2.%20AT1%2FT2%20Shortfall%3A%3AAdd%20max%280%2C%20Required_AT1%20-%20Actual_AT1%29%20%2B%20max%280%2C%20Req_T2%20-%20Actual_T2%29%7C3.%20Stack%20Full%20CBR%3A%3AAdd%202.50%25%20CCB%20%2B%20G-SIB%2FO-SII%20%2B%20Weighted%20CCyB%20%2B%20SyRB%20%3D%20True%20MDA%20Trigger%7C4.%20Quartile%20Factor%3A%3AMap%20remaining%20CET1%20into%200%25%2C%2020%25%2C%2040%25%2C%20or%2060%25%20x%20Distributable%20Earnings&metrics=Quartile%204%20%2875-100%25%29%3A%3A60%25%20Payout%3A%3A40%25%20Mandatory%20Retention%7CQuartile%203%20%2850-75%25%29%3A%3A40%25%20Payout%3A%3A60%25%20Mandatory%20Retention%7CQuartile%202%20%2825-50%25%29%3A%3A20%25%20Payout%3A%3A80%25%20Mandatory%20Retention%7CQuartile%201%20%280-25%25%29%3A%3A0%25%20Payout%3A%3AFull%20Dividend%20%26%20AT1%20Ban)

## The Four CBR Quartiles: 60%, 40%, 20%, and 0% Earnings Retention Multipliers

Once available buffer-eligible CET1 falls below the Combined Buffer Requirement (`CBR = 2.5% CCB + G-SIB/O-SII + CCyB + Systemic Risk Buffer`), the maximum fraction of annual/quarterly **distributable profits** that may be paid out across dividends, buybacks, AT1 coupons, and variable remuneration steps down across four equal quartiles of CBR:

- **4th (Top) Quartile (`75% < CET1_Buffer <= 100% of CBR`)**: Up to **60%** of earnings may be distributed (minimum 40% retained).
- **3rd Quartile (`50% < CET1_Buffer <= 75% of CBR`)**: Up to **40%** distributed (60% retained).
- **2nd Quartile (`25% < CET1_Buffer <= 50% of CBR`)**: Up to **20%** distributed (80% retained).
- **1st (Bottom) Quartile (`0% <= CET1_Buffer <= 25% of CBR`)**: **0%** distributed (100% of earnings retained; complete ban on dividends, buybacks, bonuses, and AT1 coupons!).

## Current-Year Net Loss Trap under EU CRD Art. 141 vs U.S. Four-Quarter Eligible Retained Income

Notice a critical transatlantic nuance when a bank reports a **negative net income** in a single stress year while sitting in the 4th (60% payout) quartile:

Under **EU CRD V Article 141**, MDA equals `(Interim + Year-End Unappropriated Profits Net of Tax) * Quartile_Factor`. Prior to CRD V clarifications allowing inclusion of interim/year-end profits not yet in CET1, if a Eurozone bank overseen by the [European Central Bank](/regulators/european-central-bank-160) suffers a current-year net loss (`Profit <= 0`) while inside its CBR, `MDA = 0 * 0.60 = EUR 0`—forcing an immediate 100% AT1 coupon skip even in the top quartile!

Under **U.S. 12 CFR 217.11**, the [Federal Reserve](/regulators/u-s-federal-reserve-system-156) revised **Eligible Retained Income (ERI)** in March 2020 to equal the **greater of** (a) four-quarter net income net of distributions, or (b) the **average of the preceding four quarters’ net income** (ignoring prior distributions), smoothing one-quarter stress losses for institutions like [Bank of America](/institutions/bofa) and [Ally Financial](/institutions/ally-financial).

| CET1 Buffer Position (% of CBR) | Basel / EU CRD Art. 141 MDA Factor | U.S. Part 217 ERI Payout Cap (SCB Stack) | Permitted AT1 Coupon Priority | Mandatory Supervisory Filing |
| --- | --- | --- | --- | --- |
| Above 100% of CBR (>MDA Trigger) | Unrestricted (100% Discretionary) | Unrestricted (subject to CCAR plan) | Paid in full ahead of common div. | Routine ICAAP / SREP reporting |
| Quartile 4: >75% to 100% of CBR | 60% of current-year net profits | 60% of 4-quarter avg ERI | Discretionary inside 60% MDA pool | Capital Conservation Plan (5 days) |
| Quartile 3: >50% to 75% of CBR | 40% of current-year net profits | 40% of 4-quarter avg ERI | Discretionary inside 40% MDA pool | Capital Conservation Plan (5 days) |
| Quartile 2: >25% to 50% of CBR | 20% of current-year net profits | 20% of 4-quarter avg ERI | Discretionary inside 20% MDA pool | Capital Conservation Plan (5 days) |
| Quartile 1: 0% to 25% of CBR | 0% (Zero Distributions Allowed) | 0% (Zero Distributions Allowed) | 100% Cancelled (Non-Cumulative) | Immediate remediation & P2R action |

## Parallel Leverage-MDA (L-MDA) and MREL-MDA (M-MDA) Stacks

Post-CRD V / CRR II, G-SIBs actually track **three simultaneous MDA stacks**: Risk-Based Capital MDA (`CET1 vs CBR`), **Leverage-Ratio MDA (`L-MDA`)** against the G-SIB Tier 1 leverage buffer, and **MREL-MDA (`M-MDA`)** under [EU BRRD II MREL hierarchy rules](/wiki/eu-brrd-mrel-internal-vs-external-spe-mpe-bail-in-hierarchy). Whichever stack leaves the smallest buffer headroom sets the binding distribution ceiling.

![True CET1 MDA threshold inflation caused by under-issuance of AT1 and Tier 2 capital tranches](/api/figure?type=bars&title=How%20AT1%20%26%20Tier%202%20Shortfalls%20Inflate%20Effective%20CET1%20MDA%20Triggers&subtitle=Eurozone%20Bank%20%28P2R%20%3D%202.00%25%2C%20CBR%20%3D%204.50%25%2C%20Nominal%20CET1%20MDA%20%3D%2010.125%25%29&steps=Full%20AT1%2FT2%20Filled%3A%3A1.875%25%20AT1%20%26%202.50%25%20T2%20fully%20issued%20-%3E%20MDA%20binds%20at%2010.13%25%20CET1%7C50%20bps%20AT1%20Shortfall%3A%3AOnly%201.375%25%20AT1%20issued%20-%3E%20CET1%20diverted%20to%20T1%20-%3E%20MDA%20rises%20to%2010.63%25%7CZero%20AT1%20Issued%3A%3A0%25%20AT1%20on%20balance%20sheet%20-%3E%20%2B187.5%20bps%20CET1%20diverted%20-%3E%20MDA%20hits%2012.00%25%7CZero%20AT1%20%26%20Zero%20T2%3A%3APure%20common-equity%20bank%20-%3E%20%2B437.5%20bps%20diverted%20-%3E%20MDA%20hits%2014.50%25%20CET1!&metrics=Optimal%20Nominal%20MDA%3A%3A10.13%25%3A%3A4.5%25%20%2B%201.125%25%20P2R%20%2B%204.5%25%20CBR%7CReq.%20AT1%20Bucket%3A%3A1.88%25%20RWA%3A%3A1.50%25%20P1%20%2B%200.375%25%20P2R%7CReq.%20Tier%202%20Bucket%3A%3A2.50%25%20RWA%3A%3A2.00%25%20P1%20%2B%200.500%25%20P2R%7CPure-CET1%20Penalty%3A%3A%2B438%20bps%3A%3A14.50%25%20Effective%20MDA)

## Management Capital Targets and Capital Conservation Plan Deadlines (5 Business Days)

Because equity and AT1 markets violently reprice any bank approaching MDA, boards at [BNP Paribas](/institutions/bnp-paribas), [ANZ Bank](/institutions/anz-bank), and [Bank of Ireland](/institutions/bank-of-ireland) maintain an internal **150 to 250 bps management buffer** above MDA; any actual breach mandates submitting a formal Capital Conservation Plan to supervisors within **5 business days** across the [Basel III Endgame & Capital Ratios topic hub](/topics/basel-iii-endgame-capital-ratios).

```formula
AT1_Shortfall = max( 0 , (0.015 + 0.1875 * P2R) - AT1_Ratio )
Tier2_Shortfall = max( 0 , (0.020 + 0.2500 * P2R) - Tier2_Ratio - max(0, AT1_Ratio - (0.015 + 0.1875 * P2R)) )
Effective_MDA_Pct = 0.045 + 0.5625 * P2R + AT1_Shortfall + Tier2_Shortfall + CBR_Pct
MDA_Dollar_Pool = max( 0 , Net_Distributable_Profit ) * Quartile_Factor( (CET1_Ratio - (Effective_MDA_Pct - CBR_Pct)) / CBR_Pct )

Worked Audit (RWA = EUR 200B, P2R = 2.00%, CBR = 4.00%, Actual AT1 = 1.40%, Actual T2 = 2.60%, CET1 = 11.40%, Annual Profit = EUR 1.80B):
 Required AT1 = 1.50% + 0.375% = 1.875% => AT1_Shortfall = 1.875% - 1.400% = +0.475% (Excess T2 cannot fill AT1!)
 Required T2 = 2.00% + 0.500% = 2.500% => Tier2_Shortfall = max(0, 2.50% - 2.60%) = 0.000%
 Hard Pre-CBR CET1 Needed = 4.50% + 1.125% + 0.475% = 6.100% | Effective_MDA_Pct = 6.100% + 4.000% = 10.100%
 Suppose Stress Drops CET1 to 8.900%: Buffer Remaining = 8.90% - 6.10% = 2.80% (= 70.0% of 4.00% CBR -> Quartile 3: 40% Factor)
 Maximum Allowed Combined Payout (AT1 Coupons + Dividends + Bonuses) = 0.40 * EUR 1.80B = EUR 720M!
```

## Frequently asked questions

### Can excess Additional Tier 1 capital cover a Tier 2 capital shortfall without hurting MDA?

Yes! Because Tier 1 capital is strictly higher quality than Tier 2 capital, excess AT1 above 1.50% + 18.75% * P2R flows down to satisfy Tier 2 requirements (2.00% + 25.00% * P2R), whereas excess Tier 2 can never flow upward to cover an AT1 shortfall.

### Are Tier 2 subordinated bond coupons restricted when a bank breaches its MDA threshold?

No. Tier 2 subordinated bonds carry mandatory contractual interest coupons (non-payment constitutes an Event of Default unless in formal resolution/PONV), so Tier 2 interest is an operating expense outside MDA restrictions.

### If a bank is in Quartile 3 (40% MDA), must it cut AT1 coupons by 60% alongside common dividends?

No. MDA caps the *aggregate dollar sum* of common dividends, buybacks, AT1 coupons, and variable bonuses at 40% of profits; because annual AT1 coupons typically consume only 5%–12% of normal bank net income, management almost always zeroes common dividends first to pay 100% of AT1 coupons.

### Does dipping below ECB Pillar 2 Guidance (P2G) trigger automatic MDA restrictions?

No. Pillar 2 Guidance sits *above* the Combined Buffer Requirement; dipping into P2G triggers confidential supervisory dialogue with the ECB Joint Supervisory Team, not automatic Article 141 MDA restrictions.


## Source URLs

- https://www.bis.org/basel_framework/chapter/RBC/30.htm
- https://www.bankingsupervision.europa.eu/banking/srep/html/p2r.en.html
- https://www.ecfr.gov/current/title-12/chapter-II/subchapter-A/part-217/subpart-B

## Citation

- APA: Arthur Pendleton, CPA, JD. (2026). Maximum Distributable Amount (MDA): CET1 Buffer Quartiles & AT1 Coupon Restrictions. FinLexicon Wiki. https://finlexicon.org/wiki/maximum-distributable-amount-mda-cet1-stack-at1-coupon-stop
- Canonical article: [Maximum Distributable Amount (MDA): CET1 Buffer Quartiles & AT1 Coupon Restrictions](https://finlexicon.org/wiki/maximum-distributable-amount-mda-cet1-stack-at1-coupon-stop)
- Site research index: [FinLexicon Wiki](https://finlexicon.org/llms-full.txt)