Can i use my best-guess to state my income?

I'm looking to sign up for Obamacare in California (Covered California). From what I've read, the tax credits for plans are based on projected income for the year. I'm in the situation that my wife is currently on a salary of $28,000, and I'm unemployed. I receive $250 a week from unemployment insurance; however, I only have $4000 remaining until my claim expires. Therefore, as it stands, our income for the year will be $32,000. Of course, I hope to have a well-paying job well before the end of the year, but nonetheless that is how it currently stands.

Therefore, am I able to put down $32,000 in the "income" field? I know things could change, but there's so many variables that it just seems easier to put it how it currently stands now. And to be honest, I'd prefer to pay the lower premium now, then make up the deficit (if there is one) at the end of the year.

As a sub-question, if I do put $32,000 and then I get a job next month, do I immediately have to contact the powers-that-be to report our income change? I'm not trying to be deceptive, I'd just prefer to wait a month or two before reporting an income change, so that I know that I'm "safe" in a job. And whichever way, it'll all come out of the wash the same way at the year end.

Any advice would be greatly appreciated!

Thanks.
Rob