The ATO has published the General interest charge (GIC) and the Shortfall interest charge (SIC) rates for the fourth quarter of 2012-13.
The GIC annual rate for April - June 2013 is 9.95% while the GIC daily rate is 0.02726027%
The SIC annual rate for April - June 2013 is 5.95% while the SIC daily rate is 0.01630137%
For GIC rates, go here
For SIC rates, go here