The core of the anecdote captures real industry adaptation to South Africa’s Health Promotion Levy (HPL, the “sugar tax”), but several details are overstated, inaccurate, or incomplete. The tax did prompt reformulation and packaging changes by Coca-Cola and others; behavioural and producer responses limited the pure revenue upside relative to a static no-response scenario; and the company expanded into exempt categories like juices. However, the primary policy intent was health-related rather than pure revenue-raising, the can-alloy claim does not hold up, Cappy is not a “no added sugars” zero-sugar product in the way implied, and actual collections were not negligible.
What the HPL is and what Treasury intended
The HPL took effect on 1 April 2018. It levies 2.1 cents (ZAR) per gram of sugar above a 4 g/100 ml threshold on sugar-sweetened beverages (SSBs). The first 4 g/100 ml is exempt specifically to incentivise reformulation. Pure fruit juices (and certain dairy drinks) are exempt.
National Treasury and the Department of Health framed it primarily as a health measure to reduce excessive sugar intake, obesity, and non-communicable diseases (NCDs) in a country with high obesity rates, especially among women. Revenue was an expected secondary benefit and was not ring-fenced for health promotion—it flows into the general fiscus. Pre-implementation modelling (including work linked to PRICELESS SA / Wits) projected both consumption declines and revenue (earlier proposals were higher, around a 20% effective rate, before industry lobbying scaled it back). Actual early collections exceeded some near-term forecasts: roughly R3.2 billion from local production in 2018/19 versus lower expectations in some budget documents, with cumulative revenue in the billions of rand over subsequent years (on the order of ~R2 billion annually in early periods and totals around R16 billion by the mid-2020s in some reports). The tax base eroded over time due to reformulation, pack-size changes, and shifts to untaxed products, and the rate has not been fully inflation-indexed due to ongoing industry and sugar-sector pressure.
In short, Treasury did collect meaningful revenue, but producer and consumer responses (exactly the kind of behavioural elasticity sin taxes are designed to produce) meant the gains were smaller than a naïve static projection would have suggested. That is a feature of a well-designed corrective tax, not purely a failure.
Coca-Cola’s documented responses
Coca-Cola (and the broader industry) did adapt quickly and substantially:
- Reformulation: Average sugar content across the portfolio was reduced significantly—reports cite ~26% reduction over roughly 2016–2018/19 periods, ahead of broader industry voluntary targets. Many products moved closer to or under the 4 g/100 ml threshold (or used blends with non-nutritive sweeteners). Classic Coke still sits well above the threshold in many formulations, but the portfolio average dropped. This was publicly acknowledged in the context of the tax and global sugar-reduction strategies.
- Pack-size reductions (“shrinkflation”): Around the announcement and implementation window, standard sizes were cut (e.g., 330 ml cans toward 300 ml, 500 ml “buddy” bottles to 440 ml, larger formats adjusted or discontinued). Smaller packs lower the absolute tax liability per unit and can support higher effective price-per-litre while enabling portion-control messaging. Prices did not always fall proportionally, which is classic shrinkflation. Later observations (including 2024 reporting) noted sugar-free variants also being resized to match sugary ones.
- Portfolio shift: Greater emphasis on no-/low-sugar variants (Zero, Light, etc.), preferential pricing or marketing for them in some cases, and expansion into exempt categories.
These moves are textbook responses to a sugar-content-based tax with a threshold. Smaller producers faced greater difficulty matching the reformulation and packaging agility of a global player like Coca-Cola.
The can-alloy claim
No credible evidence links a shift to a “cheaper tin alloy” specifically to the sugar tax. South African beverage cans underwent a major transition from tin-plated steel bodies (with aluminium ends) to aluminium cans years earlier—around 2013–2014—driven by global standardisation, lighter weight (lower transport energy and cost), recyclability/value of scrap, and packaging contracts (e.g., large Bevcan/Nampak deals with Coca-Cola). Aluminium is not a “tin alloy” in the sense implied; the older steel cans used tin plating. The timing does not match the 2016–2018 tax process.
Cappy
Cappy is a Coca-Cola Company fruit-juice / fruit-blend brand available in many markets. In South Africa it was launched or significantly expanded around 2018 (sources from 2020 refer to it having launched “two years ago” and becoming one of the top ready-to-drink juices). It is positioned as 100% fruit juice blends (or fruit-flavoured options in some variants). These are exempt from the HPL because they lack added sugars in the taxable sense—though they contain substantial natural sugars from fruit concentrates (typically ~11–14 g/100 ml depending on the flavour).
It is therefore not a “no added sugars” zero-calorie or artificially sweetened product in the Coca-Cola Zero sense. Expanding into juices fits Coca-Cola’s broader “total beverage company” strategy and the incentive created by the tax (shift volume to untaxed categories). It helps protect and grow overall beverage revenues, but it is not accurately described as a pure sugar-free tax dodge launched solely for that purpose.
Broader impacts and nuances
Multiple studies (using purchase data, household surveys, and manufacturer/importer returns) find the HPL reduced sugar from taxable SSBs substantially—on the order of 29–33% or more in various metrics within the first couple of years—with larger effects among lower-income groups in some analyses. Total sugar from all SSBs fell by less because of reformulation, shifts to non-taxable SSBs/juices, and residual consumption. Health gains (lower purchases of high-sugar drinks) occurred alongside revenue, though the lack of ring-fencing and limited subsequent rate increases have been criticised by public-health advocates. Industry has highlighted job and sugar-sector impacts; health researchers emphasise averted healthcare costs and the progressive nature of reduced consumption among poorer households.
In policy terms, this is a classic illustration of how corrective taxes work: they change relative prices, induce substitution and product reformulation, and generate revenue that is lower than a no-behaviour-change counterfactual precisely because the tax is succeeding in its behavioural goals. Coca-Cola’s rapid adaptation (formula, sizes, portfolio) is rational profit-maximising behaviour under the new rules. The alloy detail appears to be a conflation with an earlier packaging transition, and Cappy is better understood as an exempt juice play rather than a zero-sugar innovation.
The episode is a useful case study in the difference between static revenue projections and dynamic real-world outcomes under a well-targeted (if imperfectly indexed and non-earmarked) sin tax.
