Taxes for married couples in Germany (Munich)

Hi everyone!

I have a question regarding taxes in Germany that's going to be a big decider on if my spouse and I can move out there.

I've been offered a salaried job in Munich so I will be a full-time employee, and my spouse will be freelancing, earning roughly half of what I earn or a bit less.

I can't figure out what tax bracket we would fall into. Bracket III seems best for me as I'd pay less tax on my salary, but are you able to just choose which bracket you want to be in, or are there criteria that get you assigned to different tax brackets that you have no say in? If I had to go into tax brackets IV or V, then I don't think we could afford to live there and so I'd have to decline the job.

Any help would be really appreciated, thank you!