Yes, when filing separately you need to include your spouses ITIN. You will need to print and mail your return as the IRS will not accept the return electronically without your spouses ITIN. When you print and mail your return you can include their name and a statement of the situation if filing separately.
If you are filing jointly, you will need to print and mail your return along with the W-7 and any other required documents to
IRS
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
Whether you file jointly or separately, when you print and mail your return, it takes longer for the IRS to process the return. Either way, you still have something they have to look at so you should expect your return processing to be delayed. It is impossible to tell you at this point which one will take longer.
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