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Rules-Based Hedging: How UK Treasury Teams Set the Rules

November 6, 2026
Rules-Based Hedging: How UK Treasury Teams Set the Rules

Rules-based hedging means your company agrees in advance how much of each currency exposure to hedge, when to add cover and with which instruments, then follows those rules whatever the market is doing. It trades the hope of beating the market for predictable results and a decision trail that a board, auditor or lender can follow. This guide covers how the rules work, what a UK policy should contain, which numbers drive it and where the accounting fits.

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TL;DR

  • A rules-based program sets hedge ratios, layers, time horizons and approval limits up front, so hedging does not depend on a market view.
  • Most corporate programs are largely rules-based: a 2026 NeuGroup survey found only 13% of members run a fully discretionary approach.
  • The rules are only as good as your exposure forecast, so forecasting quality deserves as much attention as the hedge ratio.
  • UK companies should document the policy, tolerance and responsibilities, and check hedge accounting conditions under IFRS 9 or FRS 102 before they trade.

Table of Contents

What rules-based hedging means in practice

A rules-based approach answers four questions before any trade is placed: which exposures matter, how much risk you are willing to keep, which instruments are allowed and who can act. That is how one treasury advisory team describes a sound FX hedging policy: not a forecast of currency markets, but consistent decisions under uncertainty.

Lufthansa Group is a well-documented example. Its treasury describes hedging market and credit risk by rule instead of basing the strategy on market forecasts, with the aim of reducing variations and uncertainty and buying the business time to adjust when conditions change. The same article says the group uses five layers (eleven for major currencies) across a two-year horizon, with hedge levels falling the further out the cash flow sits and averaging 50% over the period.

The point of all this, as NeuGroup's head of research put it, is to take as much emotion out of hedging as possible. Fear after a sharp move and greed after a favorable one are what rules are built to remove.

The building blocks of a rule set

Most rules-based programs are built from the same few parts. What changes is the calibration for your business.

Building blockWhat the rule decidesTypical form
Exposure scopeWhich flows are in the programForecast receipts and payments above a size threshold, by currency
Hedge ratioHow much of each exposure is coveredA target percentage, or a band around it
LayeringWhen cover is addedFixed tranches at set intervals before the cash flow date
HorizonHow far ahead you hedgeOften 12 to 24 months, shorter for volatile forecasts
InstrumentsWhat you may tradeForwards, swaps, options, as the policy lists
GovernanceWho approves and who executesNamed roles, limits, escalation path
Review triggerWhen the rules are revisitedFixed calendar or a defined risk breach

Hedge ratios and bands

The simplest rule is a single target, such as hedge 60% of forecast USD costs. Many teams prefer a band. NeuGroup describes one member running a monthly program that layers hedges into a narrow band, covering 70% to 80% of a forecast exposure and adding roughly 15 more percentage points as the exposure date approaches.

The ratio that suits you depends on margin sensitivity, pricing power and how stable your forecasts are. For context, a January 2026 survey of UK corporates found that 78% of UK firms now hedge, with an average hedge ratio of 53% and an average hedge length of 5.52 months. Treat that as a reference point, not a target.

Layering over time

Layering spreads the entry rate across several dates, so no single day decides your budget rate. Lufthansa applies the same logic to specific risks: for aircraft investment, it hedges 50% on the contract date and the other 50% in five 10% layers starting 24 months before the cash flows arise. If you want a deeper look at how layers affect earnings volatility, our guide to a layered hedging strategy walks through the mechanics.

Aircraft investment hedge layers across time

A worked example

This is an illustration, not a recommendation for your company.

A UK manufacturer expects to pay US suppliers $12 million over the next 12 months, spread evenly. The treasury team adopts these rules:

  1. Hedge 50% of forecast dollar payments for months 1 to 6 and 30% for months 7 to 12.
  2. Add cover in three equal tranches, at 12, 9 and 6 months before each payment month.
  3. Use forwards only, with no single trade above an amount the finance director has approved.
  4. Review the forecast every month. If the forecast moves more than 10% for any month, the hedge ratio is rebalanced at the next scheduled tranche date, not on the day the news arrives.

Notice what the rules do not say: they never ask where sterling is heading. When the pound falls, the team does not scramble. When it rises, no one is tempted to wait. The program runs the same either way, and the results are easy to explain.

Rules versus discretion

Rules-based hedging is not an all-or-nothing choice. NeuGroup's 2026 survey found that although 73% of policies build in some flexibility, day-to-day hedging for most respondents is largely rules-based. The most common setup is limited discretion: a defined range around a target hedge ratio, or a strict baseline with opportunistic action reserved for levels the team considers attractive. Only 13% run fully discretionary programs, staffed by dedicated traders who can hedge anywhere from 0% to 100%.

For most mid-sized companies without a trading desk, that makes the rules-first model the practical default. It needs less specialist time, produces less variance between months, and gives you a clear answer when the board asks why you hedged what you hedged.

The design question is how much flexibility to keep. One treasury advisory team warns that a policy saying treasury may hedge as appropriate is too weak to be a policy at all, while a rigid one can force over-hedging when forecasts change. A strong policy sets disciplined ranges, evidence requirements and escalation, and keeps room for professional judgment.

Rules versus discretion

Building a policy a UK company can defend

HM Treasury's 2023 guidance on managing foreign exchange exposure is written for government departments, but its structure translates well to any UK finance team. It sets four steps:

  1. Identify: build a thorough view of forthcoming foreign currency payments and receipts, including size and timing.
  2. Measure: budget for those flows, size the risk to the budget and monitor it against your risk tolerance.
  3. Manage: if risk exceeds tolerance, reduce it in a value-for-money way.
  4. Report: report total FX exposures to the people who oversee the risk.

The same guidance says the policy document should cover:

  • the objectives of the policy;
  • accountabilities and responsibilities;
  • the FX risk the organization faces;
  • the process for identifying that risk;
  • how the risk is managed, including a defined tolerance;
  • management of associated risks such as counterparty credit risk;
  • budgeting and accounting.

That list makes a good skeleton for a corporate policy. Add your own approved instrument list, trade limits and the review calendar, and you have rules that can be audited.

The numbers that drive the rules

Exposure and Value at Risk

HM Treasury recommends calculating Value at Risk (VaR) to quantify what exchange rates could do to a budget or financial position. It defines VaR as the maximum likely loss on the amount at risk, over a given period, at a given confidence level, and uses a 1% exchange rate move as an illustrative scenario. VaR is a natural trigger for rules: for example, hedge more when VaR on the unhedged exposure exceeds a set share of budgeted margin. Our explainer on Value at Risk for currency risk covers the calculation, and we describe how the method works in hedging based on value at risk.

Cost of cover

Hedging has a price, and it has been climbing. The same January 2026 survey reports that the average cost of hedging rose by 66% in 2025, with 92% of firms seeing some increase and 17% seeing costs more than double. Your rules should therefore state the cost budget, and compare the cost of cover with the loss it prevents. That is easier when the rule set specifies instruments and tenors in advance.

The cost of not covering

Market data show what is at stake. A Q1 2026 corporate hedging monitor reported that 96% of corporates suffered losses from unhedged FX exposure during the quarter, though average losses from unhedged positions fell to under £1 million from more than £2 million per quarter in 2025.

Lufthansa's treasury team says a rule-based approach is very valuable for simplicity, transparency and softening market volatility. What is harder to achieve, they add, is a reliable cash flow forecast, especially when the underlying business is volatile.

That is the practical lesson. A perfect hedge ratio applied to a poor forecast leaves you over-hedged or under-hedged. Build the forecast process first: who owns it, how often it updates, how sales and purchasing feed it. If your team is still tightening that process, these cash flow forecasting methods are a useful starting point. Many teams also add a rule that only a portion of the forecast, the part with firm orders or contracts, qualifies for the higher hedge ratio, while uncertain forecast flows get a lower one.

UK accounting and regulatory points

Rules help the accounting too, because hedge accounting needs documented intent. The details depend on your reporting framework, so confirm them with your auditor.

IFRS 9

Under IFRS 9, as set out in the UK-adopted regulation, a relationship qualifies only if it has eligible instruments and hedged items, formal designation and documentation at inception (including your risk management objective and strategy), and it meets the effectiveness requirements, including an economic relationship between the hedged item and the instrument. The three relationship types are fair value hedges, cash flow hedges and hedges of a net investment in a foreign operation. A written, rules-based policy is the natural place to record that risk management strategy.

The IFRS Interpretations Committee's June 2019 update adds that hedge accounting can only be applied if it is consistent with the entity's risk management objective and strategy, which is another reason the policy and the accounting must match.

FRS 102

Under FRS 102, hedge accounting is optional: the ICAEW helpsheet says an entity may apply it if the qualifying conditions are met. PwC's UK GAAP manual notes that the FRS 102 model is broadly aligned with IFRS 9, including the economic relationship requirement, but is much shorter and has no detailed application guidance. It covers the same three relationship types.

Older effectiveness tests

If you still meet the older IAS 39 and FRS 26 rules in legacy documents, HMRC's Corporate Finance Manual explains that a hedge must be assessed as highly effective, with actual results within 80% to 125%, and that prospective assessment can use critical terms, past changes in fair values or cash flows, or a high statistical correlation.

Perspective

Most of the CFOs and finance directors we speak to do not struggle with the idea of hedging. They struggle with consistency. Rules are written once, then quietly overridden when a rate move makes someone nervous.

We built Corphedge so that the rules live where the numbers are. Currency positions, exposure tracking and Value at Risk analysis sit on one platform, and hedging strategies can be simulated before anything is executed. When your policy says hedge more if VaR crosses a threshold, you can see the threshold and the position side by side.

Our view is that SMEs deserve the same discipline large treasuries have, without the cost and complexity of institutional systems. A clear rule set, live data and automated notifications turn a policy document into a daily routine.

Bartas

Put your rules to work with Corphedge

If you are turning a hedging policy into a working routine, the Corphedge platform brings currency position tracking, hedging strategy simulation, VaR analysis, portfolio reporting and live market data together, with automated notifications and operational expert advice from our team. We are also expanding to Poland and Sweden, so groups with operations there can follow one approach across markets.

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For the team that needs the fundamentals first, our FX hedging course is a one-off €220 purchase, and you can see more on the Academy page. To see how the platform and expert advice fit your exposures, visit our features page.

FAQ

Is rules-based hedging the same as automated hedging?

Not necessarily. Rules-based means decisions follow pre-agreed criteria. Those rules can be carried out manually by a treasury team or supported by software that tracks exposure and flags when a trigger is hit. Governance still determines who approves trades and how exceptions are handled.

What hedge ratio should a UK company use?

There is no single correct figure. It depends on how sensitive your margins are to currency, how reliable your forecasts are and what cover costs. The January 2026 UK survey cited above shows an average of 53%, but your own tolerance and VaR analysis should set your number.

Can a rules-based policy still allow judgment?

Yes. NeuGroup found that 73% of policies build in some flexibility. The usual design is a band around a target ratio, or a strict baseline with limited, documented opportunistic action, so judgment is used inside defined limits.

Do I need hedge accounting to hedge?

No. You can hedge economically without applying hedge accounting. Under FRS 102 hedge accounting is optional, and under IFRS 9 it depends on meeting documentation and effectiveness conditions. Speak to your auditor before you trade if you want hedge accounting to apply.

Sources