The ATO has published the General interest charge (GIC) and the Shortfall interest charge (SIC) rates for the third quarter of 2012-13.
The GIC annual rate for January - March 2013 is 10.24% while the GIC daily rate is 0.02805479%
The SIC annual rate for January - March 2013 is 6.24 % while the SIC daily rate is 0.01709589%
For GIC rates, go here
For SIC rates, go here