What is the best option I have while I leave Japan?

Hello all!

I’m planning on leaving Japan end of next month (Sep) for my 1-year MBA. I have a 50-50 chance of returning back to a better role at my current employer (would depend on what positions are available at that moment). Also, I recently renewed my residence and the new one expires 2028.

1. While I desire to hold my residence card, I do not want to pay residence tax. I’ve read somewhere that if I pay the residence tax for this year and do not have an address on Jan 1 of next year, I don’t have to pay any tax next year. Is this true and doable? If yes, can I notify at the airport that I will be returning between 1-2 years without having multiple entry visa?

2. I also want to keep my bank account open atleast for a year or two. Can I change my account address to my friend’s and use it from overseas? (Bank Account: MUFG)

3. I’ve been here for 5 years working, do you recommend to clear out my pension amount? Can I resume the pension in case I’ll be returning back after more than a year?

4. What are the processes I need to finish and do I have enough lead time to complete those?

Any other suggestions are welcome! Thank you very much!