Funding constraint · loss-budget calculation
6M Margin Requirements and Risk-Based Sizing
The opening equation is an integer decision: contracts = floor(risk budget ÷ stressed risk per contract). Margin is checked afterward as a separate funding constraint. If the calculation returns 0, a lower broker day-margin offer cannot turn the trade into a valid 6M size.
All results are whole contracts. Never round up.
Do not merge these questions
Performance Bond Funds the Position; It Does Not Define the Loss
The CFTC defines futures margin as money or collateral deposited to support performance, not partial payment for an asset. Initial margin is the amount required to open under the broker's rules; maintenance margin is the threshold that must remain in the account. Daily and intraday mark-to-market can create variation payments or a margin call.
Financing question
Can the account carry the position?
Use the current CME performance-bond record and the broker's current initial, maintenance, overnight, event, concentration and liquidation policies. These figures can change without waiting for an article update.
Risk question
What could the position lose?
Use the full 6M price exposure: $5 per outright tick per contract, multiplied by the actual adverse move and quantity, then include spread, slippage, fees and any liquidation shortfall.
Futures margin does not cap maximum loss. It is a conditional funding requirement that may be raised or withdrawn before the close, near a release or during volatility. A forced liquidation can fill beyond the intended stop and can leave the account owing more than the initial deposit.
Risk first
Convert Invalidation, Stress and Costs Into One Per-Contract Number
The verified CME Globex outright tick for 6M is 0.00001 USD per MXN, worth $5 on the 500,000 MXN contract. This page uses that input without repeating the full contract specification. Confirm it on the canonical 6M tick and contract guide before using any calculator.
((invalidation ticks + stress ticks) × $5) + round-trip costs=Stressed dollars per contractfloor(dollar risk budget ÷ stressed dollars per contract)=Risk-budget contract capRound down the risk budget calculation after the stop or invalidation distance, adverse-fill stress and explicit costs are included. Never round a fractional result up to create a trade.
Set a dollar budget
Choose the maximum planned loss allocation for this idea under the portfolio's rules. It is a governance input, not a percentage recommended by this article.
Locate invalidation
Define the price at which the reason for the trade no longer holds. Convert the entry-to-invalidation distance into 0.00001 ticks.
Add adverse execution stress
Reserve ticks for gap-through-stop, event repricing or thin-book execution. This is a scenario allowance, not a guarantee or loss ceiling.
Add explicit costs
Include expected round-trip commissions and exchange or broker fees per contract. Keep overlapping spread and slippage estimates from being counted twice.
A stop order controls instruction logic, not the eventual fill. When triggered, a stop commonly becomes a marketable order under the relevant order type. The fill depends on available bids or offers. Stress ticks should reflect a declared scenario and be reviewed against actual fills.
Decision aid
6M Risk-Budget Calculator
The default values reproduce the worked example below and are hypothetical. Replace them with a written plan. The tool uses a fixed verified $5 Globex outright tick; it does not fetch margin, market data or broker rules.
Arithmetic audit
A $1,000 Budget Allows Two Contracts Under This Hypothetical Plan
Assume a proposed entry and invalidation are 60 outright ticks apart. Add 20 ticks of adverse gap or fill stress and $40 of estimated round-trip costs per contract. No margin figure is needed to answer the first question.
| Line | Calculation | Result |
|---|---|---|
| Invalidation risk | 60 ticks × $5 | $300 per contract |
| Stress allowance | 20 ticks × $5 | $100 per contract |
| Explicit round-trip costs | Hypothetical commission and fees | $40 per contract |
| Stressed risk per contract | $300 + $100 + $40 | $440 |
| Risk-budget cap | floor($1,000 ÷ $440) | 2 contracts |
| Planned stressed risk | 2 × $440 | $880 |
| Unallocated budget | $1,000 - $880 | $120 |
Three contracts would carry $1,320 of modeled risk, exceeding the $1,000 input. If the live funding constraint or portfolio cap allows only one contract, final quantity is one. If either allows zero, final quantity is zero.
Model limits
A Stress Allowance Improves the Plan but Cannot Cap a Gap
The 20-tick input above is a scenario. It should be derived from relevant historical or live execution evidence, not chosen because it produces a preferred contract count. More severe moves remain possible.
| Additional stress | Stress dollars | Total per-contract model with 60-tick invalidation and $40 costs | Meaning |
|---|---|---|---|
| 0 ticks | $0 | $340 | Assumes no adverse movement beyond invalidation; fragile for execution planning |
| 10 ticks | $50 | $390 | Small adverse-fill allowance |
| 20 ticks | $100 | $440 | Worked scenario, not an empirical claim |
| 50 ticks | $250 | $590 | Larger shock assumption lowers permissible quantity |
| 100 ticks | $500 | $840 | Illustrates how gap sensitivity can dominate the original stop distance |
Increase caution or reject the trade when Banxico, Federal Reserve or high-impact data timing creates a discontinuous-price scenario the budget cannot absorb.
Use current spread and depth. A stop-sized quantity may still be too large for the executable book.
Account for closed or impaired liquidity in related cash markets, holiday hours and the inability to manage a gap continuously.
Then check financing
Live Margin Is a Multi-Layer Constraint
After risk-based quantity is known, open the current CME margin record and broker agreement. Do not copy an old article number: exchange performance bonds and house requirements are time-sensitive and can vary by account, position, portfolio and volatility state.
Exchange layer
Record current initial and maintenance requirements for the exact dated 6M contract and account classification. Note effective time and source.
FCM or broker layer
Check house add-ons, intraday concessions, overnight conversion time, event changes, concentration policy and liquidation rights.
Account layer
Subtract working-order reserves, existing positions, expected variation and a liquidity buffer. Do not allocate every available dollar to margin.
Portfolio layer
Assess correlated USD, MXN, rates and risk-sentiment exposures. A recognized margin offset is not proof that economic risk disappeared.
min(risk-budget cap, live funding cap, portfolio cap)=Final whole-contract quantityPre-order reconciliation
Seven Lines Must Agree Before Quantity Leaves Zero
- Tick source: the live order is a CME Globex 6M outright and $5 per tick matches 500,000 × 0.00001.
- Risk budget: a written dollar amount exists for this trade and is compatible with the total portfolio.
- Invalidation: the failure price comes from the thesis or setup, not from the amount of margin available.
- Costs and stress: spread, slippage, fees and a declared adverse-fill scenario are included without double-counting.
- Integer quantity: the formula is rounded down; a result below one means no 6M trade.
- Live funding: current exchange and broker requirements, overnight rules and liquidation rights are verified.
- Residual uncertainty: everyone reading the plan understands that stops, stress and margin do not establish maximum loss.
Sources, methods and editorial disclosure — reviewed August 13, 2026
- CME Rulebook Chapter 256: Mexican Peso/U.S. Dollar futures for the 500,000 MXN unit and 0.00001 Globex minimum increment.
- CME Mexican Peso futures margins for the live, time-sensitive exchange performance-bond check.
- CME LATAM FX futures FAQ for the statement that daily variation margin is in USD while collateral arrangements can differ through the FCM.
- CFTC futures glossary for initial margin, maintenance margin, margin call, mark-to-market and performance-bond definitions.
- CFTC explanation of futures markets and margin for daily mark-to-market, variation payments and the distinction between futures margin and a securities down payment.
- CFTC futures-market risk guidance for the warning that losses can exceed the initial amount deposited.
Sources and current links were reviewed August 13, 2026. The calculator and worked tables are transparent arithmetic, not margin quotes, trade recommendations, forecasts or historical results. The $5 tick is a current contract fact; the $1,000 budget, 60-tick invalidation, 20-tick stress and $40 cost are hypothetical inputs. No stress allowance guarantees a maximum loss. Live CME and broker requirements supersede this page.