Could an Immortal Evade Government Tax Detection?

While a perfectly compliant immortal might try to blend in, modern government data systems are incredibly sophisticated and would likely detect anomalies over centuries. Factors like unchanging age across multiple databases, a consistent Social Security number (if in the US) without a corresponding birth or death record, recurring financial transactions spanning impossible timelines, or a lack of changes in basic identifying information would trigger flags. Algorithms are designed to spot fraud, identity theft, and unusual patterns. The sheer longevity would create an unusual data footprint that would eventually stand out against the lifecycle data of mortal citizens.