Ignoring Medicare, your spouse’s contribution limit is $8000, and your contribution limit is $8000, and your combined overall family contribution limit is $9000.
Since your spouse enrolled in Medicare in March, her contribution limit would be $8000 divided by 12 months x 2 months= 1333.33.
I was unable to find anything in the instructions that requires you to adjust the overall $9000 family limit for Medicare. Since you contributed the full $8000, that suggests your wife could have contributed up to $1000. However, I might have missed some thing. I’m going to ask a smarter expert. @dmertz
