US Immigration from Poland

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!

So my wife has her green card now, since getting married as part of the K1 process. The only thing we don t have yet is an I-131, it s the last of the three forms to be approved (work authorization, AOS and travel authorization).

So can we take a trip to Canada without the I-131 given we have a green card in hand? I tried some searching on the topic but didn t see anything.

thanks!

Hello there! My fiance applied for the K-1 visa on February 10th this year. We forgot to add the dates on the submitted pictures for evidence, will this be a problem in the future? We didn't send in any other evidence besides the pictures and I was also wondering if it's possible to send more evidence to the UCIS without a RFE?

Hello! I am a US citizen petitioning for my husband and our daughter. I moved to Poland with my mom when I was 14. Since then I have been only visiting my father in the States every summer so I do not have a domicle in the US. My question is - will I have to leave my family here in Poland and travel to the States alone to establish domicle? Or is writing a letter in wich I state that I have intent to establish domicle enough? Thank You in advance for any advice.

Hi, I got engaged to a us citizen while being on a2 visa. Is it possible to get married on a2 visa, resign from work and to apply for adjustment of status?

If not then can I start the k1 visa application while still being in the USA on a2?