Why your Joburg bill jumped when an actual reading arrived

If you were billed estimates for months and then got a very large bill, the cause may be a "catch-up". The City finally read your meter and billed the difference in one go. Because water and electricity are priced in bands, billing several months of use in a single month can cost more than the same use spread over the months it happened. This guide shows the maths in rands, and is honest about what you can and cannot claim.

General information, not legal advice.

What happens in a catch-up

1. For some months the City bills estimates, based on your average over the previous 12 months (clause 9.3 of the Credit Control and Debt Collection Policy).
2. An actual reading is obtained.
3. The account is adjusted. The policy says: "As soon as an actual reading is obtained, the account will be adjusted accordingly."

If your real use was higher than the estimates, the adjustment adds the extra use. If it was lower, the account should be adjusted down. Ask whether the credit is refunded (clause 25.1 lets you apply for a refund of a credit balance) or left on the account. Either way, how that adjustment is priced matters.

Why banding makes it worse

Johannesburg prices water in bands. Each kilolitre (kl) in a month is charged at the rate of the band it falls in. These are the 2026/27 conventional-meter rates from the City's approved tariffs brochure:

The brochure prints no start date, so months before 1 July 2026 may be priced at the 2025/26 rates.

The brochure doesn't state the method, but its two deemed-consumption figures are consistent with each kilolitre being priced at its own band's rate: 10 kl is R134.28, which is 4 × R33.57 (the first 6 kl are free), and 20 kl is R555.13, which is R134.28 + 5 × R35.04 + 5 × R49.13. Its bands are headed "per month".

If that's how each month is priced, the same total use costs more when it all lands in one month.

Worked example: 3 months at 15 kl a month

Say you really used 15 kl in each of three months, 45 kl in total.

Spread over three months (15 kl each month)

Per month:

• 0 to 6 kl: free = R0.00
• 4 kl (6 to 10) × R33.57 = R134.28
• 5 kl (10 to 15) × R35.04 = R175.20
• Month total = R309.48

Three months: 3 × R309.48 = R928.44.

Billed as low estimates, then the remainder on one bill (5 kl, 5 kl, 35 kl)

A typical pattern: the meter isn't read for two months, you're billed estimates of 5 kl each month, and then an actual reading shows 45 kl used in total, so the remaining 35 kl lands on the third bill.

• Months 1 and 2: 5 kl each, inside the free 6 kl = R0.00 each
• Month 3, 35 kl:
  • 0 to 6 kl: free = R0.00
  • 4 kl (6 to 10) × R33.57 = R134.28
  • 5 kl (10 to 15) × R35.04 = R175.20
  • 5 kl (15 to 20) × R49.13 = R245.65
  • 10 kl (20 to 30) × R67.91 = R679.10
  • 5 kl (30 to 35) × R74.26 = R371.30
  • Month total = R1,605.53
• Three bills together = R1,605.53

Difference: R1,605.53 − R928.44 = R677.09

The same 45 kl costs R677.09 more when the remainder lands on one bill. Two things cause that. First, the third bill prices 20 kl in the R49.13 to R74.26 bands, where the spread bills never go above R35.04. Second, the low estimates use only 10 kl of the free allowance in the first two months, so 2 kl of free water is lost.

We haven't found a published rule on how the City prices a single bill that covers more than one month of use. If yours does, ask the City to show the months covered and the bands applied.

This is an example, not a quote. It uses only the water volume rates. Your bill also has other charges, and the brochure does not say whether these rates are before VAT, so check your own bill. Electricity may work the same way, but we have not confirmed City Power's credit-meter tariff, so we haven't worked an example.

What you can and cannot claim

Be precise here, because it affects how you ask.

• What the policy says. Clause 9.3 says the account "will be adjusted accordingly". It does not say the catch-up must be spread over the months the estimates covered. It also does not say it may be billed in one month.
• What that means. We found no clause in the policy that says how a catch-up is billed, so we wouldn't call billing it in one month a breach.
• What is a fair request. You can ask the City to recalculate the catch-up as if the use had been billed in the months it happened. The example above shows why that is reasonable. Treat this as a request, not a proven error.
• A possible write-off. Clause 17.1 gives the City "the discretion to write off debt if it is deemed irrecoverable", and clause 17.1.17 lists, as one ground, "numerous interim (estimated) readings for metered services that are irreconcilable and there is reason to believe that such estimates exceed actual consumption". Write-offs go to the City's Debt Write-off Committee or a designated official. It is a possible route, not a right: ask the City about it in writing.
• What is a provable error. If the actual reading is wrong, the meter is faulty, the estimates did not follow the 12-month average, or the arithmetic is wrong, those are errors you can show. See estimated readings.

Section 95 of the Municipal Systems Act says a municipality must, within its financial and administrative capacity, ensure that people "receive regular and accurate accounts that indicate the basis for calculating the amounts due", and provide accessible ways to query them (section 95). Asking how the catch-up was calculated is within that.

What to do

1. Get the readings. List each estimated and actual reading with dates, and your own meter photos if you have them.
2. Check the actual reading against your meter, and check it is plausible against your history.
3. Ask for the calculation. Ask the City to show the months covered, the quantity billed in each, and the bands applied.
4. Query it with a reference number (clause 16.1) and ask for a spread recalculation.
5. Keep paying. Clause 10.9 says "the customer must pay and remains liable for the payment of estimates charged to the account." While a query is open, clause 16.3 says it "must be accompanied by payment of, at least, the total amount outstanding on the account", and that where only part of the account is disputed, payment "shall be based on average monthly previous charges before the query/dispute arises". The two sentences don't fit together, so ask the City in writing what amount it expects. If you pay less than the total outstanding, the City may charge interest on the difference: see interest on a disputed bill. Escalate in writing if needed: see how to dispute a Joburg bill.

SALGA says residents who believe a bill is wrong should formally dispute it in writing, with supporting documents, rather than simply stop paying (EWN, 9 September 2026).

Sources

• City of Johannesburg Credit Control and Debt Collection Policy, clauses 9.3, 10.9, 16, 17.1.17 and 25.1
• Joburg approved tariffs 2026/27, water tariffs, conventional meters
• Municipal Systems Act 32 of 2000, s95
• EWN: SALGA warns against settling incorrect municipal bills, 9 September 2026

Want us to check your bill? Overbilled checks your last 3–12 months against the City's published 2026/27 tariffs and its Credit Control Policy, and lists anything it couldn't check. Check my bill