FICC GSD Margin Methodology
Clearing fund methodology and published reference haircut schedules for US Treasury positions.
Overview
The Fixed Income Clearing Corporation (FICC), a subsidiary of DTCC, operates the Government Securities Division (GSD) which clears and settles US Treasury securities. All ~167 GSD netting members are subject to a standardized clearing fund methodology that determines margin requirements.
The PrimeRisk FICC Margin Calculator estimates margin using published reference haircut schedules and independently validates results against a 3-day 99% CVaR engine.
FICC GSD Clearing Fund Methodology
Source: DTCC GSD Clearing Fund Methodology Overview v2.1 (November 2025)
VaR Model Parameters
| Parameter | Value |
|---|---|
| Method | Filtered Historical Simulation (sensitivity-based) |
| Confidence level | 99% |
| Liquidation/hedging period | 3 business days |
| Historical lookback | 10 years (~2,500 scenarios) |
| GFC stress stub | 18 months (Jan 2008 - Jun 2009), always included |
| Risk factors | Key rates, convexity, agency spread, implied inflation, volatility, time |
| Calculation frequency | Twice daily (noon and end-of-day) |
| Collection times | 2:45 PM (intraday), 9:30 AM next day (end-of-day) |
VaR Floor
Prevents margin from dropping too low even with highly diversified portfolios:
- VaR Floor Percentage Amount = Gross positions by product/maturity bucket x designated percentage
- The percentage is "no less than 10% of the historical minimum volatility of the benchmark index" for each group
- Minimum Margin Amount (MMA) uses Filtered Historical Simulation, scaling historical returns to current EWMA volatility
- Floor = max(VaR Floor Percentage, MMA)
Bid-Ask Spread Charge
Covers the cost of liquidating positions under stress. Six sub-asset groups:
| Group | Scope |
|---|---|
| 1 | Treasury under 5 years (excl. TIPS) |
| 2 | Treasury 5-10 years (excl. TIPS) |
| 3 | Treasury 10+ years (excl. TIPS) |
| 4 | Agency (all bonds) |
| 5 | TIPS (all) |
| 6 | MBS (all pools) |
Formula: Bid-Ask Charge = SUM(Gross MV per group x haircut rate per group)
Note: The specific basis-point rates for each group are not publicly disclosed.
Margin Liquidity Adjustment
Concentration surcharge for positions exceeding market depth thresholds, assessed across five Treasury tenor buckets:
| Bucket | Maturity |
|---|---|
| 1 | Under 1 year |
| 2 | 1-2 years |
| 3 | 2-5 years |
| 4 | 5-10 years |
| 5 | 10+ years |
Additional Margin Components
| Component | Description |
|---|---|
| Portfolio Differential | EWMA of historical VaR increases between collections (100+ day lookback, 1-3x multiplier) |
| Backtesting Charge | Assessed when 12-month trailing coverage below 99%; sized to 3rd-largest deficiency |
| Volatility Event Charge | 10-30% VaR multiplier for scheduled events (FOMC, NFP, elections) |
| Holiday Charge | Additional charge on business day before holidays |
| Excess Capital Premium | When VaR exceeds member's excess net capital |
| Collateral Premium | Greater of $1M or 25% of Required Fund Deposit |
| Special Charge | Discretionary, risk-based |
Minimum Clearing Fund
| Member Type | Minimum |
|---|---|
| Netting Member | $1,000,000 per Margin Portfolio |
| Repo Broker (Broker Accounts) | $5,000,000 per Margin Portfolio |
| Repo Broker (Dealer Accounts) | $1,000,000 per Margin Portfolio |
Clearing Fund Maintenance Fee
0.075-0.085% of average Required Fund Deposit (annualized, day-count 360).
Netting & Cross-Margining
- Intra-portfolio netting: Long and short positions in the same CUSIP net to a single position
- Margin Portfolio grouping: Accounts under the same legal entity and Permitted Margin Affiliates (over 50% common ownership) can be grouped
- CME Cross-Margining: Offsets between Treasury cash and futures; the more conservative (smaller) reduction of the two methodologies applies
- Dealer and Broker accounts cannot be combined
PrimeRisk Netting Benefit Model
The PrimeRisk calculator estimates a netting benefit for portfolios with both long and short Treasury positions. This reflects the reduced risk when positions partially offset each other.
Formula
| Step | Calculation |
|---|---|
| Smaller Side | min(Total Long MV, Total Short MV) |
| Netting Ratio | Smaller Side / Gross MV |
| Credit Factor | 60% (conservative proxy for intra-portfolio offset) |
| Netting Benefit | Gross Margin x Netting Ratio x 0.60 |
| Net Margin | Gross Margin - Netting Benefit (subject to minimum floor) |
Rationale
- A portfolio holding $10M long and $8M short Treasuries has significant directional offset â the net exposure is only $2M
- The netting ratio (min side / gross) measures how balanced the book is: 0% = fully directional, 50% = perfectly matched
- The 60% credit factor is a conservative estimate; FICC's actual intra-portfolio netting depends on CUSIP-level matching, maturity alignment, and correlation
- A minimum margin floor of $1,000,000 per portfolio prevents netting from reducing margin below a prudent level
Limitations
- This is an approximation. FICC's actual netting is CUSIP-level (same security nets to zero), not side-level
- Cross-maturity offsets depend on yield curve correlation, which varies by regime
- The 60% credit factor is a PrimeRisk modeling assumption, not a published FICC parameter
Intraday Monitoring
- Positions monitored every 15 minutes from 8:00 AM to 7:00 PM
- Intraday Supplemental Fund Deposit triggered when:
- Intraday VaR exceeds collected VaR by $1M+, AND
- Represents 100%+ increase, AND
- Backtesting coverage below target
- Mark-to-Market Charge: collected when MTM exposure exceeds $1M and 30% of VaR charge
Published Reference Haircut Schedules
Since no broker or FICC itself publishes the exact VaR-derived haircut rates per maturity bucket, we use the following publicly available reference schedules as proxies.
FICC GSD Clearing Fund Collateral Haircuts
Haircuts applied to Treasuries posted as clearing fund collateral:
| Security Type | Remaining Maturity | Haircut |
|---|---|---|
| Treasury (Bills/Notes/Bonds) | Under 1 year | 1.0% |
| 1-5 years | 2.5% | |
| 5-10 years | 5.0% | |
| 10-15 years | 6.5% | |
| Over 15 years | 8.0% | |
| TIPS | Under 1 year | 1.0% |
| 1-5 years | 2.5% | |
| 5-10 years | 5.0% | |
| 10-15 years | 8.0% | |
| Over 15 years | 11.0% | |
| STRIPS | Under 10 years | 5.0% |
| 10+ years | 18.0% |
Federal Reserve Discount Window
Source: Federal Reserve Collateral Valuation (July 2025)
| Duration Bucket | Haircut |
|---|---|
| 0-1 year | 1% |
| 1-3 years | 1% |
| 3-5 years | 2% |
| 5-10 years | 3% |
| 10+ years | 5% |
Treasury Repo Program
Source: TreasuryDirect Repo Program Margins
| Security Type | Margin | Effective Haircut |
|---|---|---|
| T-Bills | 101% | 1% |
| Notes/Bonds, 3yr and under | 101% | 1% |
| Notes/Bonds, 3yr to 10yr | 102% | 2% |
| Notes/Bonds, over 10yr | 103% | 3% |
OCC Collateral Haircuts
Source: OCC Acceptable Collateral & Haircuts
| Maturity | Haircut |
|---|---|
| Under 1 year | 1% |
| 1-5 years | 2.5% |
| 5-10 years | 5% |
| 10-15 years | 6.5% |
| Over 15 years | 8% |
Bilateral Repo Market Reality
While reference schedules suggest 1-8% haircuts, the actual bilateral repo market tells a different story.
Source: NY Fed; Haircuts in Treasury Repo (April 2025)
| Haircut Range | Outstanding ($B) | Share |
|---|---|---|
| Below -2% (negative) | $21.6B | ~2.7% |
| -2% to 0% | $40.6B | ~5.1% |
| 0% (zero) | $593.9B | ~74.0% |
| 0% to 2% | $108.9B | ~13.6% |
| Over 2% | $38.0B | ~4.7% |
~74% of bilateral Treasury repo trades carry zero haircut. This is a significant systemic risk concern. The Treasury Market Practices Group (TMPG) has recommended that all Treasury repo trades include prudent haircuts by June 2026.
Implications
- The reference haircut schedules represent the clearing-level / regulatory view of Treasury risk
- Actual broker-client repo financing may have much lower (often zero) haircuts
- The SEC's mandatory Treasury clearing rule (effective 2026-2027) will push more volume through FICC, where the 99% VaR methodology applies
- Broker-specific house margin adds to the FICC baseline, but the magnitude is unknown
Key Finding
No broker publicly discloses their client-facing FICC GSD haircut schedules or Treasury repo margin rates. All terms are:
- Bilaterally negotiated under GMRA/MRA documentation
- Embedded in each firm's Prime Brokerage Account Agreement
- Subject to the FICC GSD clearing fund methodology as a floor
This is fundamentally different from equity portfolio margin, where OCC TIMS provides a regulatory baseline that can be estimated. In fixed income:
- The FICC clearing-level VaR is standardized but the exact haircut rates by maturity are not published
- Client-facing haircuts are a separate, proprietary layer on top of FICC requirements
- The bilateral repo market frequently operates at zero haircut for Treasuries
FICC GSD Fee Schedule
Effective January 1, 2026. Source: FICC GSD Fee Schedule
| Fee | Amount |
|---|---|
| DVP Transaction (Dealer) | $0.04 per $1MM par |
| DVP Transaction (Broker) | $0.02 per $1MM par |
| End-of-Day Position Fee | $0.105 per $1MM par |
| Intraday Position Fee | $0.04 per $1MM par |
| GCF Trade Submission (Repo Brokers) | $0.025 per $1MM (min $1.25) |
| GCF Trade Submission (Others) | $0.070 per $1MM (min $2.50) |
| GCF Gross Position Carry (Brokers) | 0.0175 bps |
| GCF Gross Position Carry (Others) | 0.040 bps |
| GCF Net Position | 0.080 bps |
| Minimum Monthly Fee | $2,500 |
| Clearing Fund Maintenance | 0.075% of avg Required Fund Deposit |
PrimeRisk Implementation
The FICC Margin Calculator provides:
- Haircut-based margin using three preset schedules (FICC GSD, Fed Discount Window, Treasury Repo) with user-editable overrides
- 3-day 99% CVaR cross-check via the VaR/CVaR engine, providing independent validation
- Side-by-side comparison showing whether haircut margin or CVaR produces the higher requirement
- Random portfolio generator with DV01 targeting for scenario analysis
Module Structure
| File | Purpose |
|---|---|
src/app/api/margin/calculate/route.ts | Haircut margin + VaR API |
src/components/margin/MarginRateTable.tsx | Preset schedules + user-editable rates |
src/components/margin/MarginReportPanel.tsx | Results display with VaR comparison |
src/components/margin/MarginUploadClient.tsx | Upload, generate, and compute |
src/lib/var/ | VaR/CVaR engine |
Sources
- DTCC FICC GSD Clearing Fund Methodology v2.1 (Nov 2025); PDF
- FICC GSD Fee Schedule (Jan 2026); PDF
- SEC Filing SR-FICC-2025-019; Collateral-in-Lieu Service (2% haircut)
- Federal Reserve Discount Window Collateral Valuation (Jul 2025); FRB
- TreasuryDirect Repo Program Margins; Treasury.gov
- OCC Acceptable Collateral & Haircuts; OCC
- NY Fed; Haircuts in Treasury Repo (Apr 2025); NY Fed
- TMPG Best Practices; Treasury Repo Risk Management (May 2025); NY Fed
- Fed FEDS Notes; Proportionate Margining for Repo (Feb 2025); FRB
- FICC GSD Rulebook; DTCC