ediverse

Type to search across standards, messages, tools and glossary.

ediverse Explore the platform

Spotlight PEPPOL BIS Billing 3.0 The EU e-invoicing mandate is here — France Sept 2026, Belgium Jan 2026, Germany 2025.

— 01

Foundations

— 02

Standards

— 03

Flagship messages

— 04

Tools

MT503 — Collateral Claim

The bilateral collateral margin call. When a counterparty's exposure exceeds the CSA (Credit Support Annex) contractual threshold, it claims margin from the other side using this message — the first brick of the MT503-508 suite dedicated to the collateral lifecycle.

Purpose

MT503 materialises a margin call: counterparty A (exposed party, typically the bank with credit exposure on B from OTC derivatives, repos or securities lending) claims a collateral amount from B (collateral giver) to bring net exposure back inside the window allowed by the bilateral agreement (CSA for ISDA derivatives, GMRA for repos, GMSLA for securities lending).

The calculation logic: current exposure (EXPN) minus collateral already covering (COVR) = margin to call (MARG). If MARG > MTAM (minimum transfer amount) and THRS (threshold) is exceeded, the call is issued. The counterparty replies with MT504 (proposal) carrying its own valuation, or disputes via narrative.

Sequence structure

  • GENL — General Information: identifiers, function (NEWM new, CANC cancel), date, operation type (COLA — Collateral, MARG — Margin Call).
  • COLLPRTY — Collateral Parties: BIC of both parties (PTYA exposed, PTYB giver) and CSA / Master Agreement identifier (SAFE).
  • DEALTRAN — Deal Transaction: dates, exposure and margin requested amounts.
  • ADDINFO — Additional Information: free narrative (instruction, regulatory context).

Block 4 tags

TagNameFormatUsage
:20C:Reference:4!c//16xSEME, PREV.
:23G:Function4!c[/4!c]NEWM, CANC, REVR (reversal).
:22F: / :22H:Indicators:4!c[/8c]/4!cCOLA//MARG (collateral margin call), COLA//OPEN (open collateral position).
:95P:Party:4!c//4!a2!a2!c[3!c]PTYA (party A — exposed), PTYB (party B — giver), PTYC (intermediate custodian).
:97A:Account:4!c//35xSAFE — CSA or Master Agreement identifier.
:98A:Date:4!c//8!nTRAD (valuation date), VALU (next valuation).
:19A:Amount:4!c//[N]3!a15dEXPN (exposure), COVR (cover), MARG (margin), THRS (threshold), MTAM (minimum transfer amount), INDM (independent amount).
:70E:Narrative10*35xADTX (additional text), free instruction.

Real-world example

Margin call BNP Paribas → Deutsche Bank under a bilateral CSA on a euro interest-rate swap. Net exposure of 250,000 EUR (mark-to-market on 14 May), collateral in place 180,000 EUR, margin requested 70,000 EUR (above the MTAM of 50,000 EUR):

text mt503-margin-call.txt 
{1:F01BNPAFRPPAXXX0000000000}{2:I503DEUTDEFFXXXXN}{3:{108:CC20260516001}}{4:
:16R:GENL
:20C::SEME//CC20260516001
:23G:NEWM
:98A::PREP//20260516
:22F::COLA//MARG
:16S:GENL
:16R:COLLPRTY
:95P::PTYA//BNPAFRPPXXX
:95P::PTYB//DEUTDEFFXXX
:97A::SAFE//CSA-2024-001
:16S:COLLPRTY
:16R:DEALTRAN
:98A::TRAD//20260514
:22H::COLA//MARG
:19A::EXPN//EUR250000,00
:19A::COVR//EUR180000,00
:19A::MARG//EUR70000,00
:19A::THRS//EUR0,00
:19A::MTAM//EUR50000,00
:16S:DEALTRAN
:16R:ADDINFO
:70E::ADTX//CSA MARGIN CALL 16MAY26 NEXT BUSINESS DAY SETTLEMENT
:16S:ADDINFO}
  • :22F::COLA//MARG — operation type: bilateral margin call.
  • :95P::PTYA// and :95P::PTYB// — exposed party (BNP) and giver (Deutsche).
  • :97A::SAFE//CSA-2024-001 — bilateral ISDA CSA identifier.
  • :19A::EXPN//EUR250000,00 — net mark-to-market exposure.
  • :19A::COVR//EUR180000,00 — collateral already in place.
  • :19A::MARG//EUR70000,00 — called amount (gap to cover).
  • :19A::MTAM//EUR50000,00 — CSA minimum transfer amount. MARG (70k) > MTAM (50k) → the call is legitimate.

Common pitfalls

  • MARG < MTAM — a call below the CSA minimum transfer amount is ignored by the giver. Always check MTAM before issuing the MT503.
  • EXPN < COVR — if coverage exceeds exposure, that's excess collateral: the giver must call the return via its own MT503, not the exposed party. Possible PTYA / PTYB inversion depending on the CSA.
  • Mixed currency — :19A: amounts must all be in the same currency (the CSA's termination currency). Mixing EUR and USD causes a reject or worse, a wrong coverage calculation.
  • Missing SAFE — without a CSA identifier via :97A::SAFE//, the giver does not know which agreement to attach the call to, especially if it has multiple bilateral CSAs with the same counterparty (one per derivative product).
  • Misinterpreted threshold — :19A::THRS// is a contractual threshold, not the amount to pay. Margin becomes callable only if EXPN exceeds THRS. Setting THRS to 0 is valid but must be documented.

ISO 20022 equivalent

  • colr.003 — Margin Call Request, direct ISO 20022 equivalent (colr family — Collateral Management).
  • colr.004 — Margin Call Response (MT504 Collateral Proposal equivalent).
  • colr.005 — Margin Call Dispute Notification (to dispute a call).
  • MT/MX collateral migration is not mandatory in 2026; some platforms (Calypso, Murex, IHS Markit triResolve) handle both formats natively.
  • MT504 — Collateral Proposal, the giver's reply with proposed collateral.
  • MT505 — Collateral Substitution, to substitute an underlying asset.
  • MT506 — Collateral and Exposure Statement, periodic statement.
  • MT507 — Collateral Status and Processing Advice, technical status.
  • ISO 20022: colr family — Collateral Management.