If you're tempted to draw a dick and balls on your survey, be prepared for it to potentially invalidate your vote. If the Y/N answer isn't immediately obvious because of graffiti, then the ballot is invalid.
That's because all of the votes are processed by a machine.
There's also a dedicated phone line been set up to help answer any questions you have: 1800 572 113. Today, a Senate committee pushed the ABS for more info.
Here's what we learned: The ABS says some people will be entitled to a paperless option in the survey.
The result will be published by the ABS on November 15.
The results will have a few bits of information - like the gender and age breakdown, as well as how different state and federal electorates voted.
A silent elector is someone with a public profile, or someone with a well-founded risk of danger if they put their address on the public electoral roll.