Cross-border M&A is the one situation where currency options genuinely earn their premium for UK acquirers — because the underlying exposure (the deal closing) is itself uncertain, and locking a forward contract at signing creates new problems if the deal collapses. The discipline is to match the hedging instrument to the deal stage: option premium during the conditional period (LOI to signing), forward contract from signing to close, spot conversion at completion. UK acquirers who get this right deliver acquisitions at the budgeted GBP cost; those who default to a single instrument across the whole deal cycle either pay too much in premium or take asymmetric risk if the deal falls over. This guide explains how UK businesses should think about FX on cross-border acquisitions in 2026.
For related Business FX content, see our companion guides on forward contract vs currency option, currency clauses in commercial contracts, repatriating profits from overseas subsidiaries, and treasury management for UK scale-ups.
The Short Answer
UK acquirers in cross-border M&A face FX exposure across four deal stages, each with a different appropriate hedging tool:
- LOI to signing (conditional period) — the deal might not happen. Currency option provides protection against adverse rate moves while preserving upside if the deal collapses or terms change. The option premium is the cost of bidding fairly without taking blind currency risk.
- Signing to closing (firm but not yet settled) — the deal is now contractually committed. Forward contract locks the rate at zero ongoing premium cost. The optionality of an option no longer earns its premium.
- Closing (completion) — spot conversion of the agreed consideration. Already hedged via the forward booked at signing.
- Post-closing (deferred consideration, earn-outs) — ongoing exposure to future foreign-currency payments. Forward sales programme covering the deferred payment schedule.
The framework matters more than any single instrument. UK acquirers who default to spot conversion at completion typically lose 2–3% of deal value to bank margins; those who lock a forward at LOI take asymmetric risk on deal collapse; those who buy options across the entire deal cycle overpay on premium. Match the instrument to the stage.
Why Cross-Border M&A FX Is Different
Three structural features make M&A FX distinctive vs routine commercial hedging.
1. The Underlying Exposure Is Conditional
Until the deal signs, there is no contractual obligation to pay the consideration. The buyer might walk away in due diligence, the seller might accept a competing bid, regulatory approval might be denied, financing might fall through. Locking a forward contract for the full consideration at LOI creates a speculative position if any of these happen.
2. The Amount and Timing Can Move
Even after LOI, the consideration can change — due diligence findings often produce price adjustments, working capital and net debt true-ups affect the final number, and closing dates routinely slip. A forward booked for an exact amount and date assumes a precision that M&A timelines rarely deliver.
3. Deferred Consideration Creates Long-Tail Exposure
Most cross-border deals include some deferred element — deferred consideration paid 12–24 months after closing, earn-outs paid over 2–5 years contingent on performance, escrow releases tied to specific conditions. Each of these is a separate FX exposure with its own appropriate hedging treatment.
The combination of conditional exposure, variable amount, and long-tail commitments means a single forward contract booked at LOI rarely fits. The right structure layers different instruments across the deal lifecycle.
A Worked Example: £50m Acquisition of a German Target
To make the framework concrete, consider a UK acquirer agreeing to buy a German target for €58m total consideration:
- €45m payable at completion (cash consideration).
- €8m deferred consideration payable 18 months post-completion.
- €5m earn-out payable in two annual tranches based on performance.
The deal timeline: LOI signed 1 March, due diligence and SPA negotiation through May, signing target 30 June, completion target 30 September.
Stage 1: LOI to Signing (1 March to 30 June)
The deal is conditional. The buyer’s budget assumed GBP/EUR 1.18 (giving a sterling cost of approximately £38.1m for the upfront €45m). The 4-month conditional period creates rate risk, but locking a forward creates collapse risk if DD findings sink the deal or the seller accepts a competing bid.
Appropriate tool: currency option on the upfront €45m, struck at GBP/EUR 1.18, expiring at the signing target date. Premium typically 1–1.5% of notional (£380k–£570k). If the deal completes, the option is exercised or replaced by a forward at signing. If the deal collapses, the option expires worthless but the buyer hasn’t taken speculative GBP/EUR exposure on a non-existent obligation.
Stage 2: Signing to Closing (30 June to 30 September)
The deal is now contractually committed (subject to closing conditions, but the buyer’s walk-away rights are now narrow). The optionality of the option no longer earns its premium.
Appropriate tool: 90-day forward contract on the upfront €45m at the rate prevailing at signing. The option from Stage 1 either rolls into the forward (if the broker supports this) or is closed out and replaced. The forward locks the GBP cost from signing to closing.
Stage 3: Closing (30 September)
The forward contract settles. The €45m is paid to the seller in EUR; the buyer pays the locked GBP equivalent. No additional FX execution decision required.
Stage 4: Post-Closing (Deferred Consideration and Earn-Outs)
The €8m deferred consideration falls due 18 months post-completion (around April 2028). Two earn-out tranches at €2.5m each fall due in 2028 and 2029, contingent on target performance.
Appropriate tool: forward sales programme covering the deferred payment schedule. The deferred consideration is firm (subject only to working capital adjustments), so a forward at signing locks the rate. Earn-outs are conditional on performance, so they’re typically left unhedged or hedged via shorter-tenor instruments closer to the assessment dates.
The total programme: option in Stage 1, forward in Stage 2, deferred-consideration forwards from signing covering 2028, with earn-outs reviewed quarterly as performance becomes more visible.
Specific Instruments by Deal Stage
LOI to Signing — Currency Options
Vanilla European-style currency options provide rate protection without binding commitment. The option premium is the cost of insurance against adverse rate moves during the conditional period. The premium is sunk cost if the deal collapses or rates move favourably, but the structure aligns with the conditional nature of the exposure.
Some advisers recommend collar structures (buy a call option, sell an offsetting put option to fund the premium) to reduce the upfront cost. Collars cap upside if rates move favourably but reduce or eliminate the premium. They suit larger deals where the upfront premium would be material relative to deal economics.
Currency options aren’t universally available through specialist currency brokers — they’re typically offered by bank corporate divisions and specialist treasury platforms. UK acquirers often need to engage their bank’s corporate FX desk for the option leg, with the forward leg potentially executed through a specialist broker post-signing.
Signing to Closing — Forward Contracts
Standard forward contract matched to the closing date. Tenor typically 30–90 days, depending on closing condition timeline. Premium typically minimal on G10 pairs at this tenor.
The forward contract should match the closing payment exactly — same currency pair, same amount, same date. If the closing date slips, the forward can be rolled forward (with an adjustment to reflect the rate at the original closing date), or closed out and replaced with a new forward to the revised date.
Closing — Settlement
The forward contract settles. The buyer pays the locked GBP equivalent; the seller receives the agreed EUR amount (or other currency). No additional decision required, but the operational mechanics matter — settlement timing, beneficiary verification, and SWIFT routing all need to align with the closing schedule.
Post-Closing — Forward Sales Programme
For deferred consideration and longer-tail commitments, a forward sales programme covering the schedule. Each deferred payment is matched by a forward booked at signing or closing (whichever is operationally cleaner).
Earn-outs warrant special treatment because the underlying amount is uncertain — the earn-out payment depends on target performance against agreed metrics. Common approaches:
- Hedge the minimum guaranteed earn-out (if any) via forward, leave the variable upside unhedged or option-protected.
- Hedge a percentage of the maximum earn-out (e.g. 50%) reflecting the probability-weighted expected outcome.
- Defer hedging until performance against earn-out criteria becomes clearer (typically 6–12 months before payment).
Currency Considerations in the Sale and Purchase Agreement
Five SPA-level points UK acquirers should ensure are addressed properly.
1. Consideration Currency
Which currency is the consideration denominated in? The acquirer’s default is to pay in their own currency (GBP), pushing the FX risk to the seller. The seller’s default is the opposite. Most cross-border deals settle in the target’s functional currency.
2. Working Capital and Net Debt Adjustments
Most SPAs adjust the consideration based on closing-date working capital and net debt vs reference levels. These adjustments are typically calculated and paid in the target’s functional currency. The FX exposure on the adjustment is usually small relative to the headline consideration but should still be considered.
3. Deferred Consideration Mechanics
How is deferred consideration calculated? In which currency is it paid? What rate is used if there’s a rate-adjustment mechanism? An adjustment mechanism using a defined published reference rate (e.g. ECB daily rate on the payment date) is materially better than vague “prevailing market rate” language. See our currency clauses in commercial contracts guide.
4. Earn-Out Calculations
If the earn-out depends on target P&L (revenue, EBITDA, etc.), and the target reports in foreign currency, what rate translates the foreign-currency P&L to the earn-out calculation? Year-end rate? Average rate? Each method produces different earn-out outcomes. Specify in the SPA.
5. Escrow and Indemnity Mechanics
Escrow funds held against indemnity claims are typically denominated in the consideration currency. If a claim is paid out, what rate is used? If the escrow is held for 12+ months, the FX risk on the held balance is typically borne by the buyer as a foregone yield consideration.
When to Engage FX Specialists in the Deal Process
Three points in the typical UK cross-border M&A timeline where dedicated FX input adds the most value.
1. At Initial Deal Modelling (Pre-LOI)
The acquirer’s deal model is built at a specific GBP/foreign-currency rate. Stress-testing the model at +/-5% and +/-10% rate movements identifies the deal’s sensitivity to FX. This shapes whether hedging is needed at all (most cross-border deals over £5m it is), what scale of premium might be justified, and how the consideration structure interacts with FX risk.
2. At LOI (Beginning of the Conditional Period)
The option-leg execution decision. Which broker or bank provides the option, at what premium, with what flexibility around amount and timing. The option premium and structure should be agreed before the LOI is signed so the deal economics include the hedging cost.
3. At Signing
The transition from option to forward. Either rolling the existing option position into a forward through the same counterparty, or closing the option and booking a new forward through a specialist broker (often at a tighter rate). Decision should be made before signing so the forward is in place from day one of the firm period.
Anthony Bull, CEO of Cambridge Currencies, notes that UK acquirers who treat M&A FX as a deal-stage discipline rather than a single execution event typically deliver cross-border acquisitions at or near the original GBP-cost forecast. The discipline is in matching the instrument to the certainty of the underlying obligation, not in the sophistication of any single tool.
Common Mistakes UK Acquirers Make on Cross-Border M&A FX
Defaulting to spot conversion at completion. The most expensive option, especially through the acquirer’s primary bank. A 3% bank margin on £50m of consideration is £1.5m — typically larger than the entire FX hedging cost over the deal cycle.
Locking a forward at LOI. Creates speculative GBP/foreign-currency exposure if the deal collapses. The forward must be unwound at potentially adverse rates, with the loss falling on a deal that no longer exists.
Using options across the entire deal cycle. Premium accumulates. Once the deal is firm at signing, the optionality no longer earns its premium — forward contracts are cheaper for committed exposures.
Ignoring deferred consideration FX. Deferred payments 12–24+ months post-closing are real exposures. Hedging them at signing or closing locks the GBP cost.
Vague rate language in the SPA. “Prevailing market rate” for any FX-sensitive calculation in the SPA generates disputes. Specify the published reference rate, source, observation time, and dispute resolution mechanism.
Not stress-testing the deal model for FX. A deal that works at GBP/EUR 1.20 may not work at 1.10. The sensitivity should be quantified before LOI, not discovered at completion.
Using only the acquirer’s primary bank. Banks are well-suited to options and can provide forward contracts, but their margins on the forward leg are typically materially wider than specialist brokers. Multi-counterparty execution often delivers the best total cost.
No clear governance on hedging decisions. Who authorises the option premium spend? Who approves the forward booking at signing? Without documented authority, decisions delay or default to the easiest path. Document the authority matrix as part of deal preparation.
Frequently Asked Questions
How do UK acquirers manage FX on cross-border M&A?
By matching the hedging instrument to the deal stage: currency options during the conditional period from LOI to signing, forward contracts from signing to closing, spot settlement at completion (already hedged via the forward), and forward sales programmes for deferred consideration and earn-outs post-closing.
Should UK acquirers hedge the consideration at LOI?
Typically no, with a forward contract — the deal is conditional, and a forward creates speculative exposure if the deal collapses. A currency option provides rate protection during the conditional period while preserving the ability to walk away. The option premium is the cost of bidding fairly without taking blind FX risk on a non-existent obligation.
When should the option transition to a forward contract?
At signing, when the deal becomes contractually committed. At that point, the optionality of an option no longer earns its premium — the underlying obligation is firm, and forward contracts are cheaper for committed exposures. The transition typically happens within the first few days post-signing.
How is deferred consideration hedged?
Through forward contracts matched to the deferred payment schedule, typically booked at signing or closing. Each deferred payment is a separate forward, with tenor matching the payment date. For earn-outs (where the amount is contingent on performance), partial hedging or deferred hedging closer to the assessment date is more common.
What FX margin should a UK acquirer expect on a cross-border deal?
UK high-street banks typically charge 1–2% margin on large M&A transactions (better than retail rates due to scale, but still wide). Specialist currency brokers typically charge 0.2–0.5% on equivalent volumes. On a £50m completion payment, the difference is £300k–£900k. Multi-counterparty execution often combines bank options with specialist forwards.
Should the SPA specify FX mechanics?
Yes for any FX-sensitive calculation — working capital adjustments, net debt true-ups, deferred consideration, earn-out P&L translation, escrow mechanics. Specify the published reference rate (e.g. ECB daily rate, Bloomberg WM/Refinitiv 4pm London fix), observation time, and dispute resolution. Vague “prevailing market rate” language generates disputes.
What about FX on earn-outs where target performance is uncertain?
Earn-outs are difficult to hedge precisely because the amount is contingent. Common approaches: hedge the minimum guaranteed component via forward, hedge a probability-weighted percentage of the maximum (e.g. 50%) via forward sales programme, or defer hedging until performance against criteria becomes clearer (typically 6–12 months before payment).
When should a UK acquirer engage external FX specialists in the deal process?
Three points: at initial deal modelling (pre-LOI) for sensitivity testing, at LOI for option-leg execution, and at signing for the transition from option to forward. Engaging too late — only at completion — typically results in defaulting to spot conversion through the primary bank at the worst available rate.
Working through a cross-border acquisition and want to make sure your FX hedging structure matches the deal stages properly? Speak to a Cambridge Currencies specialist by phone — we work alongside UK CFOs, corporate development teams and M&A advisers on the FX execution side of cross-border deals, walking through the option-to-forward transition at signing, deferred consideration hedging programmes, and the operational mechanics of large completion payments. Request a free quote today. All transfers are completed by phone with a dedicated specialist. We work exclusively with FCA-authorised payment partners.
This guide is for informational purposes only and does not constitute financial, legal or M&A advice. Cross-border acquisition FX management depends on specific deal structure, jurisdiction, consideration mechanics, and the parties’ commercial position. Always seek independent professional guidance from qualified UK corporate lawyers, chartered accountants, M&A advisers and treasury specialists for material transaction decisions. Currency options carry their own risks including premium loss; forward contracts have deposit and break-cost considerations.
