Im not familiar with AL, but some states will still use total income, then use a ratio % to compute the tax on it based on the allocated amount....you may want to print out the AL return and walk through the math on it to see the mechanics.

Wisconsin does as Lisa said, and a lot of states do it that way

For states that are not "specific" in their income many people just allocate # days to each state.

Did you figure this out? I have the same issue