Retired in 2025

I retired in September 2025 at full retirement age. I now live on a much reduced income consisting of a state pension and social security. However, Medicare is still deducting a hefty amount for IRMAA and part D. My primary home in AK is for sale (did not sell in 2025) and while I still claim AK residency, I've been living the past 90+ days in my second home in NE. I also am registering a new business LLC in NE as of this month. However, I still travel between AK and NE. I have multiple questions for 2025 and a couple for 2026.
2025: 1. will turbo tax automatically figure out taxable income that will now be layered due to social security benefits? 2. I primarily lived in AK in 2025 and all my W2 income was generated from there but because of social security, do I have to pay NE taxes? 3. can I claim moving expenses? 4. Are my IRMAA deductions able to be a tax credit? 
2026: If my primary house sells in 2026, I'll have to change primary residence (until I complete the construction or purchase of a new home in AK). 1. What are the consequences of changing primary residence to my taxes? 2. How do I find out how to calculate capital gains (I lived in my house 25+ years), especially if I invest proceeds into a new home? 3. Can capital gains also be reduced by dollar for dollar payoff of my second home? 4. How do I prepare for taxes in NE for 2026 (I do have an annual subscription with LegalZoom that's supposed to help but I've used turbo tax for many years) I don't expect to generate a lot of revenue as much of what I do is donated time mentoring and advising as a consultant.
Thank you for your assistance in advance.