Why most municipal SWM tariffs collapse on day 91
August 5, 2026 · Cities Practice
A pattern from Phnom Penh, Bhubaneswar and Pokhara: tariff models survive their political launch but fail their first quarterly cost reconciliation.
The tariff gets approved. The press release goes out. And ninety days later, the finance team is quietly asking why collections are 40% below the model. It is almost never fraud, and it is almost never political interference. It is almost always one of three things.
1. The model assumed 100% billing coverage
No city bills every household in month one. Ever. Models that don’t build in a ramp-up curve for billing coverage set collections targets that are structurally impossible to hit, which then get blamed on “willingness to pay” instead of billing infrastructure.
2. Exemptions were negotiated after the model was locked
Every tariff reform picks up exemptions on its way through council approval — slum households, religious institutions, a category of small shops. If the revenue model isn’t rebuilt after each concession, the gap between projected and actual revenue is baked in before day one.
3. Nobody owns the reconciliation
The tariff model lives with the consultant. The billing system lives with IT. The collections data lives with the revenue department. Unless one function owns quarterly reconciliation across all three, drift is invisible until it’s a crisis.
None of this is exotic. It is unglamorous plumbing work — and it is the difference between a tariff reform that sticks and one that quietly gets rolled back eighteen months later.