DAX Eurex Margin Requirements: Practical Breakdown

Margin requirements on DAX futures (FDAX and FDXM) on Eurex are calculated by Eurex's STARS-2 margin methodology, with broker-specific surcharges applied on top. For traders sizing positions or planning capital allocation, understanding the margin mechanics is essential. This guide breaks down how Eurex margin works, what affects requirements, and how to plan capital around DAX positions.

How Eurex margin works

Eurex Clearing uses a portfolio-margin methodology called STARS-2 (System for Theoretical Analysis and Numerical Simulations). The system simulates a range of market scenarios (price moves, volatility changes, time decay for options, etc.) and calculates the worst-case loss across scenarios. Initial margin is set to cover that worst-case scenario plus a buffer.

For futures, the principal driver is expected price volatility over a standard liquidation horizon (typically 1-2 days). Higher volatility regimes produce higher margin requirements.

Approximate FDAX margin

Margin requirements change over time and across volatility regimes. As approximate working numbers:

Initial margin

• FDAX: ~€10,000 to €15,000 per contract under normal volatility.
• FDXM: ~€2,000 to €3,000 per contract.

These figures can rise substantially during high-volatility regimes, Eurex may double margin requirements during periods of elevated index volatility.

Maintenance margin

Typically set at approximately 75-85% of initial margin. Once equity falls below maintenance, additional margin must be deposited or positions reduced.

Broker-specific surcharges

Most retail-focused brokers apply margin surcharges above the Eurex baseline:

• Interactive Brokers, typically applies modest surcharges, often 10-25% above Eurex baseline.
• Saxo Bank, surcharges vary; check the contract-specific margin schedule.
• Specialist futures brokers (where Eurex is offered), surcharges may be lower for active trading accounts.

Day-trading margin reductions

Some brokers offer day-trading margin reductions on FDAX and FDXM positions opened and closed within the same session. Reduced margin can be 25-50% of the overnight figure.

Day-trading margin is contingent on closing positions before session close. Failure to close triggers a margin call to bring the position to overnight margin levels, which often means forced liquidation if cash isn't available.

For active intraday traders, day-trading margin substantially improves capital efficiency. For position traders, only the overnight margin matters.

What affects margin requirements

1. Volatility regime

Higher realised and implied volatility on the underlying DAX index produces higher margin requirements. Regime shifts can prompt rapid margin escalation.

2. Position size tier

Some brokers and the exchange itself apply tier-based scaling, larger positions face proportionally higher margin per contract.

3. Account portfolio offsets

For accounts running offsetting positions (e.g., long FDAX + short DAX options), portfolio margin treatment can reduce net margin. Eligibility for portfolio margin requires opt-in and minimum account balance.

4. Broker-specific risk premium

Brokers may apply additional margin premiums based on their internal risk assessment of the client account or the contract.

Calculating capital required

For a trader planning to hold FDAX overnight at moderate position sizing:

Capital required = Position size × (Initial margin + Reserve buffer)

Reserve buffer should cover:

• Adverse intraday moves before margin call.
• Potential margin escalation during volatile regimes.
• Operational reserves for new positions.

A practical template: 2x initial margin as minimum capital allocation per FDAX contract.

For FDAX at €12,500 initial margin:

• Minimum capital allocation: €25,000 per contract.
• Reasonable working capital: €30,000-€50,000 per contract for active position management.

For FDXM at €2,500 initial margin:

• Minimum capital allocation: €5,000 per contract.
• Reasonable working capital: €6,000-€10,000 per contract.

Scenarios that increase margin

Elevated volatility regimes

When DAX implied volatility (V-DAX or VDAX-NEW index) rises, margin requirements typically rise within days. Multi-week stress regimes can push margin requirements 50-100% above baseline.

Geopolitical or macro stress

Major events (elections, ECB surprises, geopolitical inflection) may trigger immediate margin escalation as Eurex re-runs scenario analysis under updated assumptions.

Concentrated positions

Large positions in a single contract may face additional surcharges from the broker's risk management.

Approaching expiry

Some brokers increase margin on positions held into the final week before expiry, particularly if the trader hasn't initiated the roll.

Margin call mechanics

If account equity drops below maintenance margin:

1. Broker issues margin call notification.
2. Trader has limited time (often hours, not days) to deposit additional cash or reduce position.
3. If trader fails to act, broker liquidates positions to bring account back to maintenance level.

Forced liquidation by broker may not match trader's preferred exit price. Liquidation execution may face wider spreads in volatile regimes.

Avoiding forced liquidation

1. Hold significant cash buffer

Beyond minimum margin, hold 50-100% additional cash in the account as buffer.

2. Monitor margin ratio actively

Most brokers display margin ratio (current equity / maintenance margin requirement) in real time. A ratio approaching 1.5x or below warrants attention.

3. Pre-define position reduction triggers

If margin ratio drops below a defined threshold (e.g., 2.0x), reduce position rather than waiting for forced liquidation.

4. Diversify capital

Don't allocate 100% of account to a single position. The cash buffer enables both flexibility and absorption of adverse moves.

5. Be aware of overnight risk

Major events outside trading hours can produce gap moves that move from comfortable margin position to liquidation in seconds. Position sizing should account for overnight gap risk.

Comparison: FDAX vs FDXM capital requirements

| Position size | Capital required (working) | |---|---| | 1 FDAX contract | €25,000-€50,000 | | 1 FDXM contract | €5,000-€10,000 | | 5 FDXM contracts | €25,000-€50,000 |

5 FDXM contracts equal the notional and margin requirement of 1 FDAX contract. The choice between consolidated FDAX position and split FDXM position depends on operational preference and granular risk control needs.

Reading the margin schedule

Brokers publish margin schedules per contract on their websites. Key information to track:

• Initial margin (overnight), required to open/maintain overnight positions.
• Maintenance margin, minimum to avoid margin call.
• Day-trading margin, reduced margin for intraday-only positions.
• Surcharge amount, the broker's premium above exchange margin.
• Effective date, margin tables update periodically; verify current values.

Cross-account considerations

For accounts holding multiple positions (multiple instruments, multiple expiries), margin offsets may apply through:

• Portfolio margin, for eligible accounts holding multiple Eurex instruments.
• Cross-product offsets, limited but possible for highly-correlated instruments.

Confirm with broker which offsets apply to your specific account structure.

Related reading

• DAX futures on Eurex, parent overview.
• DAX vs Euro Stoxx correlation, pair trading the two indices.
• Index Derivatives pillar, the full landscape.