Seasonality: steering cash flow when activity yo-yos

Quick answer. Managing the cash flow of a seasonal business means mapping the monthly activity profile, building reserves during the high season and sizing a short-term facility on the maximum trough. The lag between collections and needs can reach 60 days from invoice date between businesses (Article L441-10 of the French Commercial Code).

A seaside restaurant, a toy shop, a landscaper, a ski school or a dental practice with a strong orthodontic component do not live their year in a straight line. Activity rises, peaks, then falls. The problem is not the annual revenue, which is often healthy, but the timing gap between when money leaves and when it comes in. That gap is what derails the cash flow of an otherwise profitable business.

At Hayot Expertise, a firm registered with the Île-de-France Order of Chartered Accountants, we regularly handle files where the income statement is sound but March or November cash turns red. Seasonality is not a fate: it can be steered, provided you think in monthly flows rather than annual averages.

The annual average lies. A business generating 60 % of its revenue over four months spends eight months drawing down reserves while paying charges that fall at a steady pace: rent, salaries, contributions, loan instalments.

On top of this activity lag comes a payment lag. Between businesses, the maximum contractual payment term is 60 days from the invoice issue date, or 45 days end of month by option (Article L441-10 of the Commercial Code). Absent any clause, the default term is 30 days. As a result, the cash peak comes after the activity peak, and the sharpest cash need often precedes the sales restart, when stock must be bought or seasonal staff hired.

The underestimated risk. The danger is not the trough itself, which is predictable, but the combination of the activity trough, fixed tax deadlines (VAT, corporate tax instalments, CFE) and the funding need for the next season. These three curves often overlap in the same month.

Here is the method we apply in cyclical-activity files. Each step feeds the next.

1. Map the monthly activity profile. Rebuild revenue month by month over two or three years to get the real curve, not an average.
2. Identify cash troughs and peaks. Shift the activity curve by the actual payment terms to locate the cash trough, which is not the activity trough.
3. Build reserves during the high season. Set aside, in good months, enough to ride out the low season and meet tax deadlines.
4. Size a short-term facility for the troughs. Calibrate the financing on the maximum measured trough, and negotiate it when the file is strong.
5. Track the gap to forecast every month. Compare actuals to the plan and correct early.
6. Smooth cash flow across the year. Spread what can be spread to reduce the gap between high and low.

The first building block is to build a 13-week cash flow forecast, which is then extended over twelve rolling months to capture the full cycle.

Map and locate the real trough#

The monthly map is the step many owners skip. Without it, you finance in a panic. With it, you know in advance that the low point will fall, say, in February, and by how much.

The table below illustrates, on a cautious anonymised case, the gap between the activity curve and the cash curve. The figures are management orders of magnitude, not reference values.

Our reading. The most dangerous month is almost never the quietest in activity. It is the month when you already have to pay for the next season while the previous one's collections have dried up.

Build reserves and size the financing#

Reserving requires discipline: in high season, the surplus creates an illusion of comfort. That is precisely the time to set aside corporate tax, VAT and CFE, which do not follow activity. Collected VAT is never available cash: it is a debt to be remitted at the deadline.

When the trough exceeds the reserve capacity, you turn to short-term financing. The following table compares the legitimate options.

Trade-off. Between a permanent overdraft and a dedicated line, we often steer towards a line sized on the real need: a structural overdraft is expensive and weakens the banking relationship, whereas a line negotiated upfront, file in hand, is easier to discuss. For this, it is best to prepare the bank financing meeting with a quantified forecast.

Track, smooth and invest the surplus#

Steering does not stop at the forecast. You must track the gap between budget and actuals every month and revise the plan. A trough deepening faster than expected is dealt with before the facility is used up.

Smoothing means reducing the amplitude: spreading supplier deadlines, billing some charges monthly, and temporarily investing the high-season surplus. For the portion that will not be needed before the next trough, you can invest the cash surplus in liquid instruments. As an indication, the Livret A rate is 1.5 % gross per year since 1 February 2026 (decree of 28 January 2026, period until 31 July 2026); beyond that date the rate is to be confirmed. For company cash, financial income is taxed in the corporate result, not to be confused with personal taxation.

Seasonality is not managed the same way across sectors.

• Retail and e-commerce. The need peaks before the sales peak, at the stock-purchase moment. Collected VAT and platform fees blur the margin reading. The roll-out of electronic invoicing, whose receipt becomes mandatory for all liable businesses on 1 September 2026, will also speed up the administrative pace.
• Seaside or mountain restaurants and hotels. Extreme concentration over a few months, a seasonal payroll to fund upfront, and annual fixed charges to carry off-season.
• Dental practice with strong orthodontics. Care is exempt from VAT (Article 261, 4-1° of the Tax Code), but orthodontics and aligners fall under the standard 20 % rate (BOI-TVA-CHAMP-30-10-20-10). Seasonal fitting at the start of the school year can then generate a lagged VAT liability. Our dedicated page on the financial management of a dental practice details these effects.
• Project-based services. Cash depends on billing milestones: a signing trough in summer is paid for in cash in the autumn.

Points of vigilance 2026. Watch the scissor effect between fixed tax deadlines and variable activity, negotiate your lines before the trough, and remember that late-payment penalties between businesses apply automatically the day after the due date, at 12.15 % in the first half of 2026 (ECB key rate plus 10 points), with a flat fee of 40 EUR per invoice (Article L441-10 of the Commercial Code). Beyond 30 June 2026, this rate is to be confirmed.

Recently, the head of an SME in the leisure sector approached us: profitable over the year, yet every winter he ended up in an unplanned overdraft, negotiated under pressure and at a high price. Rebuilding monthly revenue over three years showed that the low point fell systematically in February, when the summer-season collections were already spent and the equipment purchase for the next season landed in March.

The answer came in three moves: a reserve built in high season for tax deadlines, a short-term line sized on the measured trough and negotiated in June with a solid forecast, and monthly tracking of the gap to plan. The unplanned overdraft gave way to anticipated financing, less costly and discussed from a position of strength. This work is part of a forecast-balance-sheet engagement with your chartered accountant, beyond the mere presentation of accounts.

For structures with a complex cycle, an outsourced CFO to steer cash takes over monthly tracking and the banking relationship.