Treasury Management for UK Scale-ups: A Series A to Series C Framework

UK scale-ups face a treasury problem that doesn’t fit the playbook from either a startup or a corporate: more cash than the founder-CFO model can manage informally, but not enough volume to justify a dedicated treasury team. Between Series A and Series C, most UK scale-ups go from £2m of foreign-currency annual flows to £20m, with the FX, banking and counterparty decisions becoming materially more important at each stage. Get the treasury function right and FX, working capital and banking become operational background. Get it wrong and treasury becomes a recurring source of board-level surprise. This guide explains the practical UK scale-up treasury framework in 2026, stage by stage.

For related Business FX content, see our companion guides on how to set an FX policy for your UK business, managing cash flow with foreign currency, multi-currency receiving accounts, and how to choose a currency broker.

The Short Answer

UK scale-up treasury management runs on five core functions, each scaling with stage:

1. Cash management — where cash sits, who can move it, what authorisation is required, and how the runway is monitored.
2. FX hedging — how foreign-currency exposure is identified, hedged, and reported, scaling from ad-hoc spot conversions to structured forward sales programmes.
3. Multi-currency banking — source-currency receiving, working-capital banking, and the relationship balance between specialist brokers and high-street banks.
4. Counterparty management — how the scale-up diversifies banking and FX counterparty risk as the cash balance grows beyond £85k FSCS protection.
5. Reporting and controls — the governance overlay that gives the board visibility without adding overhead disproportionate to scale.

The trigger for each function isn’t calendar age or headcount — it’s scale-up stage and underlying cash and FX volumes. The right time to upgrade each function is when its absence starts to surface as a recurring management issue.

Stage 1: Series A — £5m Raised, £1–3m Annual FX Flows

At Series A, most UK scale-ups have just received the largest single cash injection in their history. The treasury function is typically run by the founder-CEO and a part-time CFO or finance lead, with most decisions taken in a Slack thread and tools that worked at £500k of annual flow.

Five practical priorities at this stage:

• Pick a single primary banking relationship — typically a UK high-street bank or a challenger like Revolut Business or Monzo Business. The Series A capital sits here as runway. Counterparty diversification doesn’t need to be sophisticated yet.
• Set up source-currency receiving — the most expensive default at Series A is letting Stripe or your bank auto-convert all foreign-currency receipts. Configure source-currency settlement and hold EUR/USD balances for matching outflows. See our multi-currency receiving accounts guide.
• Open a specialist currency broker relationship — even at modest FX volumes, a specialist relationship beats bank conversion margins by 1.5–2% on every transaction. The onboarding takes 2–5 days and pays for itself within the first month.
• Document a basic FX policy — even a one-page policy covering the basics (when to convert, when to hedge, who can authorise) is materially better than no policy. See our FX policy framework.
• Establish a 13-week cash forecast — weekly updated, reviewed at every executive meeting. The Series A cash balance feels infinite until it isn’t; the forecast is the early warning.

The Series A treasury function should be operationally simple but documented. The complexity comes later; the discipline starts now.

Stage 2: Approaching Series B — £5–10m Annual FX Flows

By the time a UK scale-up is approaching Series B, foreign-currency flows are typically substantial enough that ad-hoc handling is starting to fail. The CFO is in post (full-time, sometimes with a finance manager), and treasury becomes one of several functions competing for finance-team attention.

Five upgrades at this stage:

• Formalise the FX hedging programme — move from ad-hoc spot conversions on net positions to structured forward contracts on confirmed exposures. Forward sales programmes covering 6–12 months ahead match the AR cadence for SaaS and B2B exporter businesses. See our forward contracts for UK businesses guide.
• Document hedge ratios per exposure type — the policy upgrade from “we hedge sometimes” to “we hedge X% of confirmed Y exposures with Z tenor.” The ratios become defensible at the next funding round when investors ask about FX risk management.
• Add a secondary banking relationship — counterparty concentration becomes a risk above £5m of cash balance. A second UK regulated banking relationship (typically the bank holding the FCA-authorised payment partner’s safeguarded client account, plus the primary bank) provides operational redundancy.
• Implement multi-currency accounting — Xero with multi-currency enabled, QuickBooks Multi-Currency, or Sage with the FX module. Bank feeds from primary bank, broker accounts, Stripe, and any platform-specific receiving accounts. Single source of truth for the cash and FX position.
• Quarterly treasury review at the executive level — 30–60 minute session reviewing cash position, FX exposure, hedge cover, and policy adherence. Documented decisions, action items.

Series B preparation typically surfaces the treasury function as a board-level question for the first time. The cleaner the framework at this point, the smoother the funding process.

Stage 3: Series B and Beyond — £10m+ Annual FX Flows

Post Series B, UK scale-ups typically have a CFO and at least one finance manager or financial controller. Treasury still isn’t a dedicated role but is a defined responsibility within the finance function. Cash balances post-funding can exceed £10–20m, making counterparty risk a real consideration.

Six upgrades at this stage:

• Formalised counterparty diversification — cash spread across at least two regulated UK banks plus the FCA-authorised payment partner safeguarded client account. Per-counterparty exposure limits documented.
• Treasury yield management — cash beyond operational working capital should be earning return rather than sitting in current accounts. UK money market funds, fixed-term notice deposits, and treasury bill ladders all play roles.
• Forward sales programme covering 50–70% of forecast 12-month FX revenue — layered hedging against the reasonably committed portion of forecast ARR. Reviewed monthly, rolled forward as new contracts are confirmed.
• Documented signing authorities matrix — who can authorise what payment value, who needs co-signing, what dual-authorisation is required for transfers above defined thresholds. Critical control as the team grows.
• Regular FX policy review — every 12–18 months, reviewed against realised volatility, business strategy and stage. Hedge ratios, instruments, counterparty limits all on the table.
• Board-level treasury reporting — cash position, runway, hedge cover, FX gain/loss attribution, counterparty exposure all reported as part of monthly board pack. Not a treasury report in isolation — integrated into the standard financial reporting.

By Series C, treasury has become a defined operational discipline rather than an emerging concern. The framework matures further but the core functions are largely in place.

A Practical UK Scale-up Treasury Stack

The typical setup for a UK scale-up at Series A through Series C:

Cambridge Currencies works exclusively with FCA-authorised payment partners (Currencycloud FRN 900199 and ScioPay FRN 927951), with all client funds fully safeguarded. See are currency brokers safe for the regulatory framework.

Counterparty Risk — The Stage-Up Question Most UK Scale-ups Get Wrong

UK FSCS deposit protection covers UK bank deposits up to £85,000 per banking authorisation. For a UK scale-up holding £5m+ of cash post-funding, the effective FSCS protection covers a fraction of the balance. The remainder is exposed to the credit of the bank.

Three patterns UK scale-ups use to manage this:

• Diversification across multiple regulated UK banks — splitting balances reduces per-counterparty exposure. Operational cost is the additional bank relationships to manage.
• Money market funds with overnight liquidity — typically AAA-rated, holding short-dated UK Treasury bills and high-quality bank deposits across many counterparties. Provides counterparty diversification with minimal operational overhead.
• FCA-authorised payment partner safeguarded accounts — client funds at specialist brokers operating through FCA-authorised payment partners are held in safeguarded segregated client accounts at regulated UK banks, ringfenced from the partner’s working capital. This is structurally different from FSCS protection but provides parallel cover.

For UK scale-ups with £5m+ of treasury cash, a combination of all three is typical. The exact mix depends on operational capability, yield priorities, and how the CFO weighs counterparty risk against operational simplicity.

Treasury Reporting for UK Scale-up Boards

The right treasury report at Series A to Series C scale isn’t a 30-page treasury management report. It’s a one-page snapshot integrated into the standard board pack covering five points:

• Cash position by currency and counterparty — GBP, EUR, USD balances, with the bank or broker account holding each.
• Runway — forecast cash through next funding event, sensitivity to a 10–20% revenue shortfall.
• FX hedge cover — percentage of forecast 6–12 month foreign-currency revenue under forward contracts, with the locked rate range.
• FX gain/loss attribution — monthly P&L impact of FX movements, separated from operating performance.
• Material exposures or events — anything outside normal range that the board should be aware of.

Anthony Bull, CEO of Cambridge Currencies, notes that the UK scale-ups with the cleanest treasury outcomes through Series A to Series C aren’t those with the most sophisticated treasury teams — they’re those who set up the basic discipline at Series A and upgraded it incrementally as scale demanded. Sophistication beats nothing; discipline beats sophistication.

Common Mistakes UK Scale-ups Make

Defaulting to the bank for FX. Most UK banks charge 2.5–4% on FX. At £5m of annual foreign-currency volume, that’s £125–£200k of annual cost vs a specialist broker. The savings compound through every subsequent funding round.

No counterparty diversification beyond £500k of cash. Single banking relationship is fine at £200k of cash. At £5m+, it’s an unmanaged operational risk.

Letting cash earn nothing. Series A money sitting in a current account at zero return is a real cost. UK money market fund yields plus fixed-term deposit yields routinely produce material returns on idle cash that go straight to extending runway.

Ad-hoc FX hedging. Hedging when it feels right (typically after an adverse move) is trading, not hedging. Document the policy and stick to it regardless of where rates have just been.

Postponing the FX policy until something goes wrong. The cost of writing a one-page FX policy at Series A is two hours; the cost of explaining a material FX hit to the board at Series B without a policy is materially larger.

Treasury reports nobody reads. Board pack treasury sections that run to many pages typically get ignored. One-page treasury snapshots in the standard finance section get attention.

Not upgrading the treasury function with each stage. Series A treasury that worked fine at Series A typically fails at Series B. The function should evolve as cash balances and FX volumes grow.

When to Bring in External Treasury Specialists

Three triggers where UK scale-ups typically engage external treasury support:

• Series B funding round preparation — investor due diligence on treasury practices is more rigorous at this stage. External specialist input shapes a defensible framework.
• Cash balance crosses £10m — treasury yield management and counterparty diversification at this scale benefit from specialist input that the in-house finance team typically doesn’t have.
• Material FX exposure becomes a board-level concern — first time the FX gain/loss line in the P&L attracts board scrutiny, the framework typically benefits from external review.

Cambridge Currencies works alongside CFOs and finance leads at UK scale-ups on the FX execution side of the treasury function. We’re not a treasury management consultancy, but we work with UK chartered accountants and treasury specialists who provide that broader function.

Frequently Asked Questions

When does a UK scale-up need a treasury function?

Practically, when foreign-currency flows exceed £1–3m a year or cash balances exceed £5m. At Series A, the treasury function is typically run by the founder-CEO and part-time CFO. By Series B, it becomes a defined responsibility within the finance team. By Series C, it’s a documented discipline. A dedicated treasury role typically only makes sense at Series D or beyond.

Should a UK scale-up use a high-street bank or a specialist currency broker?

Both, in different roles. UK high-street banks for primary banking, payroll, working capital. Specialist currency brokers for FX execution — the rate savings (typically 1.5–2% vs banks) compound at scale-up FX volumes. Most UK scale-ups run both relationships in parallel.

How much cash should a UK scale-up hold in money market funds?

Typically operational cash (3–6 months of forecast outflows) in primary banking accounts; the remainder split between fixed-term deposits, money market funds, and (at larger scales) treasury bill ladders. The exact mix depends on liquidity needs, counterparty diversification priorities, and yield environment.

What FX hedging do UK Series A scale-ups need?

At Series A with £1–3m of annual FX flows, basic forward contracts on confirmed foreign-currency revenue and a documented FX policy are the operational minimum. Forward sales programmes (layered cover over 6–12 months) become standard at Series B as foreign-currency volumes grow.

How do UK scale-ups manage cash counterparty risk?

Through diversification across multiple regulated UK banks, money market funds (AAA-rated with overnight liquidity), and FCA-authorised payment partner safeguarded client accounts. UK FSCS protection covers £85k per authorisation, so balances above that need diversification. Most UK scale-ups at £5m+ of cash use a combination of all three approaches.

When should UK scale-ups document an FX policy?

At Series A. Even a one-page policy covering when to convert, when to hedge, who can authorise, and reporting cadence is materially better than no policy. The policy formalises the discipline that compounds across subsequent stages.

What treasury reporting do UK scale-up boards need?

A one-page snapshot integrated into the standard board pack covering five points: cash position by currency and counterparty, runway, FX hedge cover, FX gain/loss attribution, and any material exposures. Long-form treasury reports at this scale typically don’t get read.

When should a UK scale-up engage external treasury specialists?

Three triggers: Series B funding round preparation (investor DD on treasury), cash balance crosses £10m (yield management and counterparty diversification benefit from specialist input), or material FX exposure becomes a board-level concern. Most scale-ups don’t need treasury consultancy at Series A.

Setting up or upgrading your UK scale-up treasury function and want to make sure your FX execution, multi-currency receiving and hedging programme are right for your stage? Speak to a Cambridge Currencies specialist by phone — we work with UK scale-ups from Series A through Series C, walking through the practical setup for source-currency receiving, forward sales programmes, and FX policy frameworks that scale with the business. 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, treasury or accounting guidance. UK scale-up treasury management depends on your business’s specific stage, sector, currency mix, and risk tolerance. Always seek independent professional guidance from qualified UK chartered accountants and treasury specialists for material decisions. Counterparty protection, money market fund characteristics, and yield environments change over time.