If you get married before December 31, 2023 at midnight, then you won't be able to file as a single person. You will have to choose either Married Filing Jointly or Married Filing Separately. The IRS uses your marital status at the end of the year to determine your filing status, and it applies to the whole year. If it is a significant enough benefit to file single vs. married . . . get married in early January. But generally married filing jointly tax rates are preferable to filing as a single person, and if your spouse makes LESS money than you, it is likely to be advantageous to file together. One significant exception is if your spouse is qualifying for certain income -based tax credits (like the earned income credit) that would be eliminated if you filed together.
Your new spouse owning an LLC will affect your tax return - you will have to incorporate that as a part of your overall tax return. If your spouse files a Schedule C (as a single member LLC, this would be the default type of filing), you will add that Schedule C to your joint tax return. If your new spouse has elected to have their LLC file as a partnership or S-Corporation, you will have a K-1 to add to your return.
I'm not sure your question about financial aid - if you are asking if your spouse's income will be added for financial aid purposes, the answer is yes - when you fill out the FAFSA, your tax return will reflect both income amounts.
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