Managing Liquidity Through a Funding Gap: Practical Tools for Bridge Periods

Calculating True Liquidity: Available vs Committed vs Restricted Cash

The most common and most consequential financial management error during a bridge period is confusing total cash with available cash. A company reporting £3m of cash on its balance sheet may have substantially less available for operational use. The distinction between available, committed, and restricted cash is critical and must be understood before any other liquidity management decision can be made correctly.

Available cash is the cash that can be accessed immediately and used for operational purposes. It is the balance in the company's operating accounts, less any minimum cash balances required by lenders (typically a covenant in any venture debt or banking facility), less any operational float that must be maintained to process daily payments without a shortfall.

Committed cash is cash that is earmarked for a specific future payment that cannot be avoided or deferred. Committed cash includes: payroll and associated NIC and pension contributions due in the next 30 days, rent and lease obligations due in the next quarter, existing vendor contracts that carry minimum take-or-pay commitments, any tax liabilities (VAT, PAYE, and corporation tax instalments) that are due and cannot be deferred, and drawdown obligations on any committed facilities. Committed cash is not available for reallocation without a contractual breach or a negotiation.

Restricted cash is cash that is legally unavailable for general operational use. For regulated firms, this includes ring-fenced client money (which is not the firm's cash at all), backing pool assets held for e-money redemption, any cash held as security for a credit facility or letter of credit, and any escrow balances held for a specific purpose (for example, cash held in escrow from a customer advance pending delivery milestones).

A practical illustration: a company with a gross cash balance of £3m may have £500,000 in restricted client money, £800,000 in committed payroll and rent for the next two months, and a £200,000 minimum cash covenant in its venture debt facility. True available cash is £3m minus £500k minus £800k minus £200k, giving £1.5m. The simple calculation of 15 months of runway at £200,000 per month becomes 7.5 months. This difference can be fatal if not understood early enough.

The 13-Week Cash Flow Model as Primary Liquidity Tool

The 13-week cash flow forecast is the gold standard liquidity management tool during a bridge period. It provides daily visibility of receipts and payments, identifies the low-cash weeks before they arrive, and gives the CFO the information needed to make informed decisions about timing of payments, acceleration of collections, and drawdowns on any available facilities.

The 13-week model is built from specific, identifiable cash flow items, not from monthly P&L projections divided by four. The key categories are:

• Receipts: Named customer receipts with expected receipt date, recurring subscription receipts based on debit run dates, and any other identified inflows. Each receipt should be tracked as an individual line item during a bridge period, not aggregated into a weekly total.
• Payroll and people costs: Specific payroll run date, PAYE payment date (19th of each month for electronic payment), pension contribution payment date, and any bonus or commission payments that are committed.
• Rent and fixed costs: Specific payment dates for rent (often quarterly in advance for UK commercial leases), insurance, software subscriptions, and other fixed costs that are not adjustable in the short term.
• Variable costs: Payment terms-adjusted timing of accounts payable, where each creditor's payment date is specifically identified. During a bridge period, the CFO typically extends payment terms on every payable where this is commercially viable without triggering a service suspension.
• Tax payments: VAT payment date (typically the 7th of the second month after the quarter end for online filers), PAYE dates, and any corporation tax instalment payments.

The minimum cash balance is a critical parameter in the 13-week model. During a bridge period, the CFO should define a minimum operating cash balance below which the business would face operational difficulty: the inability to make payroll, to pay a critical supplier, or to trigger a covenant breach. This minimum balance should be shown as a red line on the cash flow chart, making it visually clear to the board when the model suggests the cash position will approach that threshold.

Levers to Extend Runway Without Distress

Before reaching for emergency bridge financing, the CFO should systematically work through the operational levers that can extend runway without creating legal or reputational risk. These levers can collectively add 2 to 4 months of runway in a well-managed bridge period:

Headcount freeze vs reduction. A headcount freeze (stopping new hiring) is a low-cost, low-risk first step that can save £20,000 to £50,000 per month in a Series A company with open roles, with no redundancy cost and minimal operational impact. A headcount reduction (making people redundant) saves more cash but carries statutory redundancy costs, notice period costs, and the management time and morale impact of a redundancy process. The break-even point for a redundancy versus a freeze depends on the notice period, statutory redundancy entitlement, and time to next funding: as a rough rule of thumb, a redundancy for a role with a 3-month notice period breaks even at approximately 5 months. If the bridge period is expected to be less than 5 months, a freeze is almost always preferable.

Working capital improvements. Two specific working capital actions are available to most businesses in a bridge period:

• Accelerating receivables: Contact all customers with outstanding invoices and offer a small early payment discount (1 to 2 per cent) for payment within 5 business days. For a company with £300,000 of outstanding trade receivables with standard 30 to 60 day payment terms, accelerating collection by 3 weeks can bring £150,000 to £200,000 of cash forward. The cost of the discount (£1,500 to £3,000) is trivial relative to the liquidity benefit.
• Extending payables: Contact non-critical suppliers and negotiate a 30-day payment extension. Most suppliers will agree to a one-time extension if asked early and given a credible explanation. Do not simply stop paying without communication: a creditor who does not hear from you will escalate to legal action faster than one who has been kept informed.

Revenue acceleration through pricing or prepayment incentives. Offer annual prepayment discounts to monthly-paying customers: a 10 to 15 per cent discount for payment of the next 12 months upfront. This brings forward a significant cash receipt at a manageable margin cost, and reduces future monthly churn risk. For a SaaS company with 50 monthly-paying customers at £2,000 per month, converting 20 per cent to annual at a 12 per cent discount generates approximately £211,000 of immediate cash at a cost of approximately £25,000 in forgone revenue.

Capital expenditure deferrals. Any discretionary capex should be deferred until after the bridge period. Equipment leases can often be delayed by 1 to 3 months with a simple request to the vendor.

Bridge Financing Options

Where operational levers are insufficient to close the liquidity gap, bridge financing is required. The main options available to UK growth companies in 2025 are as follows:

Communicating Early with the Board and Investors

The single most important principle in liquidity management is early communication. Investors who are surprised by a liquidity crisis are investors who feel that they have been misled or that the CFO failed to identify a foreseeable problem. Investors who are told early, with a clear analysis of the situation and a credible plan, are investors who can and generally will help.

The early warning principle should be operationalised as a specific trigger: the CFO notifies investors and the board proactively when the runway model shows less than 9 months of available runway (not at 3 months, which is already a crisis). That notification should include: the current cash position and available liquidity (distinguishing available, committed, and restricted cash), the current burn rate and the actions being taken to reduce it, the updated fundraising timeline and probability assessment, and the specific ask or next steps from the board.

The CFO communication should be factual, calm, and solution-oriented. The goal is not to alarm but to inform and to engage board support at a point where that support is still materially helpful. A board that receives a calm, well-prepared liquidity briefing at 9 months of runway can help accelerate the fundraising process, provide a bridge from existing investors on reasonable terms, and introduce the company to new investors with a warm recommendation. A board that receives the same information at 3 months of runway has far fewer options and far less goodwill to draw on.

Decision Framework and Timeline

The following framework sets out the decision sequence that should govern liquidity management from 12 months of runway through to financial stability:

1. Month 0 (12 months runway): Complete the true liquidity calculation. Build the 13-week model. Identify all available operational levers. Begin the fundraising process.
2. Month 1: Implement headcount freeze. Begin collection acceleration and payables extension negotiations. Notify lead investors proactively with the liquidity update and fundraising plan.
3. Month 3 (9 months runway): Formal board liquidity review. Confirm fundraising timeline and probability. Assess whether any bridge financing is needed to span the gap, and if so, initiate discussions with existing investors on convertible note terms.
4. Month 6 (6 months runway): If fundraising is not progressing to plan: engage formal advisers for the bridge, consider all structural options, and implement meaningful cost reduction if not already done.
5. Month 9 (3 months runway): If fundraising has not closed: this is a crisis. Engage insolvency practitioners for advice on directors' duties. Explore asset sales, trade sale, or orderly wind-down as options alongside any remaining financing possibilities.

Key Takeaways

• True liquidity is available cash, not total cash. Restricted cash (client money, backing pool, escrow) and committed cash (payroll, rent, tax liabilities, covenanted minimums) must be excluded from any runway calculation.
• The 13-week cash flow model is the primary liquidity management tool during a bridge period. It should be updated weekly, should identify receipts and payments as specific named items, and should show the minimum cash balance as a visual red line.
• Operational runway extension levers should be used before bridge financing: headcount freeze (saves £20,000 to £50,000 per month with no redundancy cost), receivables acceleration (30-day early payment discount), payables extension (30-day extension from non-critical suppliers), and annual prepayment incentives for monthly subscribers.
• Bridge financing options in order of cost and accessibility: existing investor convertible note (fastest and cheapest if investors are supportive), venture debt drawdown (fastest if covenant tests are met), revenue-based financing (available in 2 to 3 weeks for MRR businesses), and asset-based lending (for receivables-rich companies).
• The early warning principle: notify the board and lead investors proactively at 9 months of runway. Do not wait until 3 months. Investors who are informed early can help; investors who are surprised cannot.
• Payroll must be met on time, every time. It is the non-negotiable priority in a bridge period. Every other payment can be deferred, renegotiated, or disputed. Payroll cannot.
• The companies that survive bridge periods are those that started the liquidity management process 6 months before they needed to. Early identification, early communication, and early action are the only reliable approach.