consult a crypto-savvy tax professional or attorney immediately, as coinjoins obscure on-chain links but don't eliminate the need to report taxable events like sales or income based on your personal records.

the irs requires documenting your cost basis and transactions for all virtual currency, even if mixed—failure to comply can lead to audits or penalties.

irs.gov

https://www.irs.gov/individuals/international-taxpayers/frequently-asked-questions-on-virtual-currency-transactions