Surprisingly, the IRS says you should conceal the sources of your income:

Sensitive But Unclassified (SBU) data [includes]...Budget...Net worth...amount or source of any income, profits, losses, or expenditures of any person... source

They recommend hiding that data:

• "Encrypt all sensitive files...[with] strong password protections."
• "Wipe clean or destroy old...hard drives and printers [holding] sensitive data."
• "Limit access to [sensitive] data to [those] who need to know."
• source

Using tools like coinjoin and stealth addresses shouldn’t raise suspicions. We’re really just following IRS recommendations.