Married Filing separately to reduce capital gains tax on investments

[DebLH]

I retired from freelance work this year and have no income other than about $2700 from an early 2022 project.  But I'll have about $30K in capital gains for 2022 on accounts I hold solely in my name.

My spouse has a six figure income.  

Can I file separately to reduce my capital gains tax?

And given a similar income situation for 2023, could I do a ROTH conversion next year while filing separately, to reduce my capital gains tax?

[Bsch4477]

Almost always filing jointly is a better choice. Do it both ways before you decide to file separately. 

[DebLH]

Is "doing it both ways" easily done in Turbo Tax?

Meaning, will all the data I've entered translate back and forth as I click Married Filing Jointly or Separately?