Long time reader of PoPVille here… but just create my account to respond to this forum post. I had this happen to me last year. I was told by the tax office that they were randomly asking people for written verification of their SS# due to a lot of tax fraud in DC. I see this request as ridiculous and overly burdensome so I contacted my city councilmember (Tommy Wells) about it, actually via Twitter. I was able to work with their office to get the request waived and my tax refund processed. They were very helpful! I highly suggest that you reach out and get the city to start pushing back on the tax office as there is no reason for this.