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"the earliest triggering purchase in the wash-sale window"

That's been my interpretation.

 

Actually, the IRS Pub does not say that.

it says "the earliest purchase" 

 

I let the broker do it's job of tracking my basis, as required by IRS.

I tried in the past to understand TD Ameritrade's assignment rule, but I could not figure it out.

 

@garfmaj