South Africa's wine cellars are carrying a heavy load. For cellar managers and co-op directors from Stellenbosch to Swartland, this is not an abstract macro problem — it shows up in every full tank, every delayed bulk sale, and every conversation about next year's intake price.

How Big Is the Overhang?

The numbers are stark. According to Yvette van der Merwe, CEO of SA Wine Industry Information and Systems (SAWIS) and president of the International Organisation of Vine and Wine (OIV), South African wine stock levels are estimated to have increased from 470 million litres the previous year to 598 million litres — levels similar to those last seen during the COVID-19 pandemic [1]. During 2020 and 2021, the industry struggled to work through 621 million litres and 611 million litres respectively [1].

Van der Merwe noted that industry benchmarks typically suggest stock levels equivalent to about six months of sales, although this varies by segment [1]. Current levels exceed that range, placing pressure on pricing and storage capacity. Her own framing was blunt: "I don't want to use the word surplus, but the current stock level is perhaps 220 million litres too much." [1]

The 2026 harvest — estimated at 1.37 million tonnes, a moderate increase on 2025 after several smaller vintages — has added to the pressure [2]. South Africa Wine said high wine stocks and softer demand in parts of the local and international markets were putting pressure on sections of the value chain after the larger 2026 crop [2]. About 60% of South African wine is consumed locally, meaning export channels must absorb a significant share of any increase in production [2].

Export data underlines the difficulty. Export value fell 4.7% to R9.8 billion in 2025, while volumes dropped 13.8% to 264 million litres [2]. Bulk wine — which typically earns lower margins — fell by almost a fifth [2]. The United Kingdom remained the largest market, flat at $145 million, while exports to the United States declined 28% to $28 million after US tariffs took effect in August 2025 [2].

The Real Cost of Carrying Stock

There is a temptation to treat full tanks as a waiting game — hold the wine, hope prices recover, and move it when the moment is right. But holding stock is not free. Every litre in a vessel ties up working capital, occupies tank space that could be used for the incoming vintage, and accumulates the cost of monitoring, temperature control, top-ups, and potential quality losses over time.

Van der Merwe was direct on this point at a Vinpro regional information day in Stellenbosch: "Yes, we can see the high stock levels through for the next two to four years, but there is a cost involved in storing that stock." The question is whether that cost is being calculated at the parcel and vessel level — or whether it is simply absorbed into overheads and forgotten until a cash-flow crisis forces a decision [1].

Cellars in regions like Paarl and Constantia, where land and infrastructure costs are higher, face a more acute version of this pressure than producers in lower-cost areas like the Swartland. But the structural challenge is the same everywhere: stock that sits idle is not neutral. It is a drag on the business that compounds with every passing month.

Slow Correction or Fast? Understanding the Price Risk

Van der Merwe framed the industry's choice clearly: work through the surplus gradually over several seasons, or opt for faster correction. "This is a question every role player should ask themselves. Your business model differs from your neighbour's, it differs between regions, and this is where you must make that decision," she said.

Previous modelling from the Bureau for Food and Agricultural Policy (BFAP) illustrates the stakes. However, if stock levels increase to around 450 million litres, bulk wine prices could decline by as much as 20% [1]. Current stock levels are now estimated at almost 600 million litres in total — meaning the industry is well inside the danger zone of that more severe scenario [1].

Van der Merwe acknowledged the reality: "The direction of travel depends on how quickly we address the imbalance." For individual cellars, this translates into a concrete planning question: at what point does a discounted bulk sale today cost less than the ongoing carrying cost plus the risk of a severe price decline if the system does not correct?

Early vineyard conditions point to good production potential for 2027, with healthy vine reserves, adequate water, and promising fruitfulness noted by South Africa Wine [2].

Tank-Level Visibility by Cultivar and Vintage

One of the most common gaps in cellar risk management is the absence of real-time, tank-level inventory visibility organised by cultivar and vintage year.

A cellar in Stellenbosch carrying, say, two seasons of Chenin Blanc in different vessels faces very different quality and pricing trajectories for each lot. Blending decisions, bottling schedules, and bulk offers to the market all depend on knowing exactly what is in each tank, at what stage, and at what cost of production. The same applies to W.O. (Wine of Origin) compliance records, which must be maintained accurately for each lot throughout its life in the cellar.

At the SAWIPB affiliates breakfast in Paarl, Kachne Ross from South Africa Wine emphasised that the industry's key issues include dealing with surpluses, how to sell wine, how to access markets, and what impacts the industry [3]. Collaboration and shared best practices were identified as essential. But collaboration starts with each cellar having its own house in order — knowing its stock position precisely before it can engage meaningfully with co-operative bulk arrangements or market development initiatives.

South Africa's area under production has declined from a peak of about 102,000 ha in 2006 to roughly 86,500 ha today [1]. Despite this, production has remained relatively stable thanks to improved plant material and production practices [1]. Van der Merwe put the question plainly: "The question we have to ask ourselves now is whether we actually need 86,500 ha." Decisions about cultivar mix, vineyard removal, and intake volume will shape cost structures for years to come [1].

Planning Your Way Through the Adjustment

Rico Basson, chief executive of South Africa Wine, said a successful harvest should not be judged on volume alone [2]. The industry needs to focus on value, market development, and long-term profitability. Decisions on water, vineyard management, and cultivar choice would be critical.

Van der Merwe urged producers to treat the current period as a structural adjustment rather than a cyclical downturn: "The direction we take now will determine whether we stabilise the system or continue carrying structural imbalances for years to come." For individual cellars and co-ops, that means building a planning process that links vineyard-level decisions to cellar capacity, bulk sales targets, and cash-flow modelling — and revisiting that plan as 2027 unfolds [1].

The IPW (Integrated Production of Wine) framework and the W.O. system already require detailed lot and origin records. The same data infrastructure that supports compliance can, with the right tools, support the kind of tank-level inventory visibility and cost tracking that makes stock management decisions defensible rather than intuitive.

Cepaos supports this workflow — from tracking fermentation and vessel movements through to inventory of dry goods and costing per product — so that cellars can see exactly what each litre is costing them to hold, and plan bulk sales and intake volumes with the numbers in front of them.

Managing through a 598-million-litre overhang is not comfortable, but it is manageable for cellars that treat it as a planning problem rather than a waiting problem. If you want to see how Cepaos can help your cellar stay on top of tank-level inventory, holding costs, and 2027 intake planning, visit us here.

Sources

High stock levels, weak demand put SA wine industry under pressure — Farmer's Weekly SA, published 22 May 2026. https://www.farmersweekly.co.za/agri-news/south-africa/high-stock-levels-weak-demand-put-sa-wine-industry-under-pressure/
Early Vineyard Conditions Point to a Strong 2027 Wine Harvest — Business explainer, published 21 October 2026. https://businessexplainer.co.za/agriculture/2026/10/21/early-vineyard-conditions-point-to-a-strong-2027-wine-harvest/
Wine industry leaders call for collaboration and skills development — Food For Mzansi, published 03 November 2026. https://www.foodformzansi.co.za/wine-industry-leaders-call-for-collaboration-and-skills-development/