Upvote:3
The UK visit visa application asks about travel history for the previous 10 years. It does not specifically ask about overstaying in either the U.K. or any where else, however it does ask for the date(s) and length of visit for each country youβve travelled to during that 10 year period. Given the reason for the Australian visa refusal, which as you say you must disclose, UKVI will find out that you overstayed in the US. Whether it affects your application this time may depend on whether you were truthful about your travel dates to the US in your previous U.K. application(s). As others have said, advice from an immigration lawyer is highly advisable before you apply. Unless you have a compelling reason for wanting to visit the UK, I would seriously reconsider your travel plans.
Upvote:9
You are correct in that you need to tell the UK about your Australian visa refusal, and probably the reasons for it. the UK immigration will find out the reasons anyway from Australian immigration.
Whether you get a ban depends on whether you lied on the original application. If they asked about overstays and you didn't tell them about yours, that is deception, and is extremely likely to get you a ban. If they didn't then you may be OK.
These things are complicated. I strongly recommend you get the opinion of a UK immigration lawyer. Your future in the UK is on the line.
Just to note that even if you don't get a ban that does not mean your visa renewal will be approved. The UK now has new information about you that is not favourable, and they may decide that you are too high a risk.