Help! How to provide proof of income for the current year?

[Eric Lilly]

Hey Everyone,

I unexpectedly found myself diving into (what seems to be) a really solid deal, much sooner than I had expected. I'm worried that I have no chance of being approved for a loan considering my current situation. The property is listed at $120,000. Going for 4% or 5% down. I'm 21 years old. Unfortunately, before my current job, I wasn't making any kind of money that would put my debt-to-income ratio in a good spot. Since February I've been delivering for domino's with the sole purpose of aggressively saving for a duplex to house-hack. My Gross earnings so far this year have been $17,000. ($8,000 of which is reported tips) I know also work for DoorDash as well, so theres extra income there. I've managed to get my savings to $12,000. 

Anyway, I'm under the impression that lenders use your tax returns to verify your income. If they use my 2019 return, that would be very underwhelming. Is there anything I can do to apply this years income? I'm also under the impression that lenders typically want to see 2 years of income history. Is this a deal breaker? Am I screwed? Can I file my taxes early or quarterly to circumvent this? 

Would really, really appreciate any insight and advice, thanks all.

Edit: Also! The fact that the property will be producing income would aid in my debt-to-income ratio right? Is there a way I can account for that income to help get pre-approved? When would I do that, and would I need a copy of the current tenant's lease?