No. You don't COMBINE them. The max is PER PERSON. Add up each spouse's W2 box 4 separately. Each person has a max of $8,239.80. Not together.
If you are filing a joint return and both spouses have W2s you have to enter each W2 under the right name or it will look like all the W2s belong to only 1 person and too much social security tax was paid for that 1 person. And by assigning both W2s to the same person the program wouldn't know a W2 is missing from the spouse. It just would think they are both for you.
