Hello, and I apologize in advance that my post might be a little bit chaotic, but I'm just at the beginning of my journey.
I came to the US for graduate school, as the research group I was working with already during my Bachelor's is US-based. Two years in, I met my future husband. We plan to get married in January '24. I have around 1 - 1.5 years left to finish my degree, and then I can apply for up to 3 years of OPT as I'm doing PhD in a STEM field.
However, although I wouldn't be too worried about finding a job anywhere in the US after I get my degree, finding it around the city we currently live in might be more challenging - and we are bound here for the next couple of years because of my partner's child. Therefore I feel it would be beneficial to apply for AOS as soon as we're married (also, to the best of my understanding, traveling with F1 status while I'm married to a US citizen might be tricky). We plan to fill out and send the forms (I-130, I-864, and I-485) ourselves, as the money is rather tight.
So far, I have a few questions:
First, about the sponsorship. My partner himself makes only slightly above the guidance for the 3 people's household, but I do have my own income as I work at the university. Can I add myself as a co-sponsor (or should we somehow file the sponsorship jointly)?
The other question is about taxes. I understand, that later on for the removing condition filling out taxes jointly seems like the best bet... But as I will still be a non-resident alien next spring, and my country has a tax treaty signed with the US that I'm still using (which in my case just means that $2k of my yearly income is not taxable at all), I wonder if we shouldn't wait with filing jointly a year longer. I have no idea what financial benefits might come from filling jointly, and I'm pretty sure I would have to do some back pay on the treaty, which I'd prefer to avoid.
Last but not least - how do I find a doctor's office that would do the medical exam required for AOS? I assume the office must be somehow approved by immigration, and I'm completely lost on this step. Can I do the medical before getting married to save time, or is it frowned upon?
Thank you for all your replies!