Losing your biggest customer: a cash flow survival plan

It usually arrives as a polite email. A new procurement manager, a restructure, a decision to bring the work in-house. Your biggest customer — maybe a quarter or a third of your revenue — is moving on.

The first reaction is often panic. The second, more useful one is a plan. Here’s how to steady the cash, make the hard decisions quickly and come out with a stronger business.

Days 1–7: secure the cash and see the real picture

Collect everything they owe

Before anything else, make sure every outstanding invoice is paid — including work in progress, retentions and final claims. A departing customer has less reason to prioritise you. Be polite, prompt and specific: invoice everything now, confirm the payment dates and follow up on the day. Our guide to chasing unpaid invoices has scripts if you need them.

Rebuild the forecast without them

Open your 13-week cash-flow forecaster or spreadsheet and remove their revenue from the date it stops — not the date you’d like it to stop. Keep their final payments in, in the weeks you expect them.

Now look at three numbers:

• the new lowest balance and the week it happens;
• the new weekly net burn, if costs now exceed receipts;
• your runway — cash divided by net burn. Our guide to cash burn rate explains the maths.

This is your decision window. It might be months. It might be weeks. Knowing which changes everything that follows.

It also helps to be honest with your team early. Staff usually sense when something has changed. A short, calm explanation of what’s happened, what you’re doing about it and what you need from them keeps good people from looking elsewhere at exactly the wrong moment. Many teams respond to a clear plan with extra effort, particularly when they can see the owner acting decisively rather than hoping the problem will go away on its own.

Days 7–30: make the cost decisions

The mistake most owners make is cutting too little, too slowly, hoping the revenue returns. Better to make clear decisions once.

Illustrative example. A fabrication workshop turning over $1.8m a year loses a customer worth $540,000 — 30% of revenue. With a 38% gross margin, that’s about $205,000 of gross profit gone. Fixed costs haven’t moved.

Action	Annual effect (illustrative)
Stop materials and subcontract spend tied to the lost work	Automatically falls with the revenue
Don’t renew a casual role created for that customer’s volume	about $58,000 saved
Pause a planned vehicle upgrade	$0 recurring, but conserves $45,000 of cash
Renegotiate a software and equipment lease bundle	about $9,000 saved
Increase prices modestly on remaining work	about $25,000 extra gross profit
Gap still to close through new revenue	about $113,000 of gross profit

The figures are illustrative. The point is to separate what you can fix quickly (costs, prices) from what takes time (new customers) — and to know the size of each.

If staffing changes are unavoidable, get advice on your obligations and handle them with care. Your remaining team is watching how you behave.

If your new forecast shows a gap between now and when replacement revenue realistically arrives, find out what funding could bridge it — there’s no credit check to enquire.

How do you protect the customers you still have?

They’re now a larger share of your business, so:

• call your next five largest customers personally — not to alarm them, but to check in, ask about their plans and look for extra work;
• keep service levels high; stretched teams can let standards slip;
• don’t discount out of fear. Discounts to win volume can deepen the hole — our piece on the true cost of discounts shows why.

How do you replace the revenue?

Replacement usually takes longer than you’d like, so work several channels at once:

• Existing customers first. Upselling or cross-selling to people who already trust you is the fastest route.
• Past customers and quotes that didn’t convert. Circumstances change; ask again.
• The lost customer’s competitors, who may value your now-available capacity and your experience in their sector.
• Referrals and partners — accountants, suppliers, complementary businesses.
• New sectors where your skills transfer.

Forecast replacement revenue conservatively — later than you hope and smaller at first — and update weekly as it firms up.

How much concentration is too much?

There’s no official limit, but many owners find that once a single customer passes about a fifth of revenue, the business starts bending around them: prices, terms and priorities follow that customer’s needs. A practical rule is to set your own ceiling and review it quarterly as part of the ten numbers every owner should know.

Ways to reduce concentration once you’re stable:

• set a target mix and track it quarterly;
• actively build a second and third major customer before you need them;
• use written contracts with notice periods for key customers;
• price large-customer work to reflect the risk and terms involved — our feature on winning a big customer explores this.

What will a lender want to know?

If you’re considering funding to bridge the gap, a lender will want to understand:

• what was lost, and when the revenue stops;
• what you’ve already done — costs cut, prices changed, new work won;
• your forecast, with the replacement revenue timeline;
• how repayments are covered in the meantime;
• what security is available.

A clear, honest plan with a forecast is far more persuasive than optimism. The owners who arrange funding successfully after a setback are usually the ones who moved fast and can show exactly what they’ve done.

What are the early warning signs a major customer is drifting?

Customers rarely leave without signals. Watch for:

• Order volumes easing for two or three months in a row, even slightly.
• Slower payments from a customer who used to pay like clockwork.
• New faces — a new procurement manager, owner or head office taking over decisions.
• Requests for quotes on work you already do, which may mean they’re testing the market.
• Shorter commitments — month-to-month instead of annual, or smaller purchase orders.
• Less contact — fewer calls, slower responses, meetings postponed.

When you notice two or more, act. Book a meeting, ask directly how the relationship is going and what they need next year, and look for ways to add value. At the same time, quietly update your forecast with a “what if they leave” scenario so you’re not starting from zero if they do. Our guide to payment terms also covers how to protect yourself when a large account starts paying slowly.

Finally, keep perspective. Losing a major account feels personal, especially after years of good service, but it’s usually a business decision made for reasons you can’t control. The businesses that recover best treat it as information: a prompt to review pricing, diversify, tighten systems and build a buffer. Many owners look back on the loss as the moment their business became more robust — less dependent, better priced and more deliberate about the customers it chose to chase.

Buying time to rebuild

Losing a major customer is survivable. Many businesses come out stronger — more diversified, better priced and more focused. What they need in between is time, and time costs cash.

We consider trading businesses for unsecured and cash-flow facilities typically from $5,000 to $500,000, and property-secured loans from $20,000 to $5,000,000. Past credit issues and ATO debt are looked at case by case. You can enquire without any credit check, we won’t pass your details to other lenders, and a real person will call to understand what’s happened and what you’re doing about it. Please be accurate on the form — your turnover before and after, what you need and why — so we can find the right fit on the first call.

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