OpenChainGraph Suite · ART-580 · Capital Markets · Broker-Dealer Reserve Formula

15c3-3a Note H Margin-Debit Computation

Recomputes whether a margin debit tied to a broker-dealer's customer U.S. Treasury positions delivered to a registered clearing agency qualifies for inclusion in the Rule 15c3-3 customer or PAB reserve formula under Note H to Exhibit A (Rule 15c3-3a). Note H permits that one debit line only once the clearing agency's rules satisfy several Commission-approved conditions and the margin itself comes from a permitted source. Each condition is checked here as its own declared boolean, cited to the specific Note H subsection it comes from, and the verdict is INCLUDABLE, NOT_INCLUDABLE or INDETERMINATE. Where INCLUDABLE, the debit is the smaller of the margin required and the margin actually on deposit. This is a narrow sibling to the shipped ART-396 15c3-3 reserve tool: it recomputes only the Note H sliver, never the full Items 1-14 formula, and never edits that tool.

Condition-by-condition, cited Sibling to ART-396, not a replacement Fixed-point money math Not legal or regulatory advice
Basis: Exchange Act Rule 15c3-3a Note H(b)(1)-(3) · SEC Treasury-clearing compliance dates: cash by 2026-12-31, repo by 2027-06-30
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
⚠ This is not legal or regulatory advice. It recomputes only the Note H margin-debit sliver, not the full Rule 15c3-3a reserve formula (Items 1-14, see ART-396 for that). Whether a clearing agency's rules and Commission notice actually satisfy Note H, and whether the declared facts are accurate, is for the broker-dealer's own compliance and financial-operations review. This page computes once when you press the button, stores nothing, runs on no schedule, and retains nothing.
Broker-dealer and clearing agency

The demo figures below are synthetic. They are not a copy of any real firm's reserve computation, and they are already loaded so you can press Run without entering anything of your own.

Note H clearing-agency conditions (each a declared boolean)
Margin source (Note H(b)(1))
Margin amounts
Note H conditions
Rejected inputs
Rationale
    Execution Hash (SHA-256)
    What this does not do

    It does not recompute Items 1-14 of the Rule 15c3-3a customer or PAB reserve formula, only the Note H margin-debit sliver (see ART-396 for the full formula). It does not verify a clearing agency's rulebook or a Commission notice against the Federal Register at run time; both are caller-declared facts. It is not legal or regulatory advice, and it makes no assertion about whether any clearing agency's actual rules satisfy Note H.

    Related

    Sibling to ART-396 15c3-3 Reserve Formula Computation, which recomputes the full Items 1-14 customer/PAB reserve formula. This tool is independent and narrower: it covers only the Note H margin-debit condition checks and amount, never the rest of the formula, and it never edits ART-396.

    

    



    
  
    
    
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    Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this exact tool, with this sample, and verify the artifact.
    
  
    Run the AINumbers MCP tool `compute_note_h_margin_debit`. Task: Recompute whether a margin debit related to a broker-dealer's customer transactions in U.S.
Call it with arguments: {"policy_parameters":{"broker_dealer_ref":"SYNTH-BD-001","computation_date_label":"2026-08-07 weekly reserve computation","currency":"USD","clearing_agency_name":"SYNTH-FICC-LIKE-CCA","clearing_agency_conditions":{"commission_notice_published":true,"commission_notice_dated":"2024-11-25","per_customer_gross_margin_calc":true,"cash_investment_short_term_treasuries_only":true,"special_clearing_account_designated":true,"excess_margin_return_system":true},"margin_source":"customer_cash","margin_required_minor_units":500000000,"margin_on_deposit_minor_units":650000000}}
Verify before trusting: call `verify_execution_hash` on mcp.ainumbers.co (https://mcp.ainumbers.co/mcp) with the parameter `claimed_hash` set to the returned `execution_hash`, passing the full artifact the run returned (the object containing `policy_parameters` + `output_payload` + `execution_hash`; equivalently `policy_parameters` + `output_payload` with `claimed_hash`), not the bare hash string.
Return the ledger link https://ledger.ainumbers.co/ so a human can re-verify without contacting us.
PII rule: All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Open the tool with the sample prefilled: https://ainumbers.co/chaingraph/art-580-15c3-3a-note-h-margin-debit.html#p=v1.H4sIAAAAAAAA_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