Growth Costs Cash: Why Full Order Books Can Become Tight

The paradox of full order books

It is one of the most unpleasant experiences for an owner: orders have never been better, the team is working flat out, and yet the money in the account barely covers the next payroll. In the article seven growth brakes, this is the seventh brake: liquidity lagging behind growth. Its early signal is simple: the order backlog rises while the account balance falls.

This piece asks: why can growth put a healthy business into payment difficulties, and how large is the funding need it triggers? To answer it, we first clarify the terms liquidity and cash conversion cycle, then look at findings on working capital and the causes of insolvencies, and finally set out a calculation for your own business and the most important levers.

An order is only a success once the money is in the account.

Terms: liquidity, profit, and the cash conversion cycle

Liquidity is the ability to make payments when they fall due. It is not the same as profit. Profit arises when a service has been delivered and invoiced. Liquidity arises only when the customer pays. In between, there can be weeks or months in which the business has already paid for materials, wages, and third-party services.

The cash conversion cycle measures this gap in days. It has three components: how long do materials sit in inventory or work sit in unfinished orders? How long after the invoice does the customer pay? And how long may the business take to pay its suppliers? The first two components lengthen the gap, the third shortens it.

For the calculation we need a third concept, the share of direct costs in revenue. It is the counterpart to the contribution margin ratio: at a 35 percent contribution margin ratio, the business must pre-finance 65 percent of revenue before the customer pays.

The mental model: growth as pre-financing

The mental model of this analysis is simple and is nevertheless often overlooked. Every euro of additional monthly revenue must be pre-financed for the length of the cash conversion cycle, in the amount of the direct costs. As long as revenue stays the same, this amount is constant and goes unnoticed. If revenue grows, the amount to be pre-financed grows with it, immediately, while the additional profit arrives only later.

English-language literature calls the situation in which a company grows faster than its financial strength allows overtrading. The term describes not a flaw in the business model but a flaw in speed. A business with good margins can fail because of it if it does not combine growth with a funding plan.

If the example business grows by 40 percent, to 140,000 euros of monthly revenue, it needs about 45,000 euros in addition, permanently tied up in materials, work, and open invoices. This money must come from reserves, profits, or loans before the higher profit arrives in the account. The calculation is simplified: it does not include investment in vehicles or staff, seasonal fluctuations, or bad debts. In reality the need is therefore usually higher.

What studies show about working capital and profitability

Yazdanfar and Öhman (2014) analyzed data from 13,797 Swedish small and mid-sized companies in four industries for the years 2008 to 2011. The cash conversion cycle had a clear effect on profitability: companies with a shorter cycle were more profitable. Size, age, and industry also played a role. The authors conclude that companies can increase profitability through better management of inventory, receivables, and payables, and point out themselves that the results are based on four industries in one country.

Jaworski and Czerwonka (2022) reached a similar result for 326 companies listed on the Warsaw Stock Exchange over the years 1998 to 2016: there was a linear negative relationship between the cash conversion cycle and profitability. The studies measure associations, not causes. It may also be that profitable companies can afford shorter payment terms because they negotiate from strength. The direction of the finding is the same in both datasets, though.

When it gets tight: what insolvency data show

A recent study of the construction industry in Australia shows how dangerous liquidity shortfalls are for small businesses. Jayawardana, Wijeratne, Vrcelj, Weththasinghe, and Sandanayake (2026) combined a review of the research literature with ten years of data from the Australian corporate regulator. Micro and small businesses accounted for more than 90 percent of reported insolvencies in the industry. In 2024, construction accounted for almost a quarter of all company insolvencies in the country.

Among the reported causes, inadequate cash flow at about 16 to 20 percent, poor strategic management at about 12 to 18 percent, and weak financial controls at about 11 to 15 percent regularly ranked highest over the decade. In more than half of the cases, warning signs such as unpaid statutory obligations and deteriorating working capital appeared beforehand. The authors stress that construction firms work with tight margins, complex contracts, and long payment chains. That is exactly why the industry is a good illustration for businesses that pre-finance projects.

Two readings: growth as solution or as cause

A common reading says: liquidity problems can be solved through growth. More orders bring more revenue, more revenue brings more money. Over a longer period that is true if the orders have a sufficient contribution margin. In the short term the opposite holds: every additional order initially lengthens pre-financing.

The second reading says: growth is the cause of the shortfalls and should therefore be slowed. That also falls short. A business that does not grow out of fear of liquidity shortfalls forgoes contribution margins that would make it stronger in the long run. I consider a third view correct: growth is a funding task. If you calculate and plan it in advance, you can grow without getting into a squeeze.

The levers: how to narrow the gap

The cash conversion cycle has three components, and each can be addressed. Even a few days make a difference: if the example business with 140,000 euros of monthly revenue shortens its cash conversion cycle from 52 to 40 days, about 36,000 euros are freed at 65 percent direct costs.

1. Agree down payments

   For larger orders, a down payment when the order is placed and progress payments by stage or milestone. This shortens the gap most.

2. Invoice quickly and completely

   Invoice on the day of acceptance, with all the documentation the customer needs for approval. Every day between service and invoice lengthens the gap.

3. Follow up receivables

   Overdue invoices are chased according to a fixed process. How to do this is analyzed in the article late payment and receivables management.

4. Limit inventory and work in progress

   Order materials per job where possible and finish started jobs before starting new ones.

5. Use supplier terms

   Make full use of agreed payment terms without straining the relationship. Early-payment discounts are usually still worthwhile when cash is available.

Another lever lies in the business model. Recurring services invoiced in advance shorten the gap or even reverse it. How to build such contracts is described in the guide building recurring revenue. Where payment terms are used as a sales argument against competitors, for example in exports, the rule is: a payment term is a loan to the customer. The article export and sales describes a study according to which generous payment terms open doors but can cost profitability and survival chances in the long run.

Transfer: growth with a funding plan

The same sequence applies to every growth step: first calculate the additional funding need, then settle the financing, then grow. This applies to a new region as much as to a new service or a large order. With a regional expansion, vehicles, staff, and marketing are added and paid for before new customers pay; the guide expanding into a new region therefore describes checkpoints before each step. How the interest rate environment affects the financing of investments is analyzed in the article interest rates and investment.

• The business’s cash conversion cycle is known and calculated quarterly.
• The additional funding need is calculated before every growth step.
• There is a 13-week liquidity forecast that is updated weekly.
• Larger quotes include a down payment and progress payments.
• How a growth spurt would be financed has been discussed with the bank before it happens.

The limits of this analysis lie in the data. The studies cited come from Sweden, Poland, and Australia and partly concern listed companies. German insolvency statistics do not report causes in the same form. The mechanism of pre-financing, however, is independent of the country.

Conclusion: why full order books become tight

Why can growth put a healthy business into payment difficulties? Because every additional euro of revenue must be pre-financed for the length of the cash conversion cycle, while the additional profit arrives only later. How large the need is can be calculated with three figures: additional monthly revenue, cash conversion cycle, and share of direct costs. Research shows an association between a shorter cash conversion cycle and higher profitability, and insolvency data show how often small businesses fail precisely on cash flow.

1. This week: Calculate your business’s cash conversion cycle from inventory period, receivables period, and supplier terms.
2. Next week: Calculate the additional funding need that growth of 20 and of 40 percent would trigger.
3. In a month: Set up a 13-week liquidity forecast and add down payments to your quote template.

Full order books are a good sign. They are just not an account balance.