Prorate items after moving from US to canada

[SOCAL Al]

Move to Canada mid year.  What needs to be prorated i.e. SS,, investment income etc.???

[BobKamman]

US citizen? Resident alien?

[SOCAL Al]

Current status is resident alien but maybe duel citizenship.  One is US and not Canadian as far as I know.  they have sole us home and plan to stay in Canada.  

[BobKamman]

US citizens and resident aliens are taxed on all their income, regardless of where they live.  They may qualify for foreign tax credit or exclusion of earned income (from your post, sounds like they're retired).  You might be able to pro-rate income for state tax purposes.  If they owe Canadian tax, they need to know how much in order to calculate foreign tax credit.  

[SOCAL Al]

Discuss foreign tax credit and or exclusion to both taxing agencies.  US received all the 1099's, W-2" etc.  how to calculate.  What form does Canada use?  They moved in August so about half of earnings would be US and half Canadian as I see it.