In florida my husband and I are the only managing members on an LLC. Are we able to file our taxes with one of us claiming 100% of profits and losses and the other as 0% if we are filing jointly.
You need to follow the operating agreement. If the operating agreement says that the profits and losses are shared equally - then that is what you need to write down in your taxes.
It does matter, since it affects your FICA rights and liabilities (which, I assume, is the reason why you're asking this).
No, you cannot just make up numbers. You need to follow the OA.
When you file a joint return there are no separate numbers for husband and wife. Everything is aggregated together.