Thanks VolvoGirl, we did have the same set of W2s as in previous years. My usual process is getting a clear scan of them when they come in the mail, or download them from the employer in one case. I then use the upload option to have Turbotax scan the details.
I don't recall this time around whether or not TurboTax asked me if each one belonged to me or my wife prior to uploading. It's possible it did and I just mistakenly accepted the default in this case, which would presumably be me instead of my wife.
I still do think though that it would have been helpful for Turbotax to highlight a calculation like this in the summary, since (I assume) it would not be particularly common scenario for an employer to withold excess social security for employees.
