Is IRS Publication 550 - how investment income & expenses are treated for taxes

Publication 550 (2021), Investment Income and Expenses
(Including Capital Gains and Losses)

https://www.investopedia.com/terms/i/irs-pub-550.asp

https://www.thebalancemoney.com/what-is-irs-publication-550-5209945

https://www.freshbooks.com/glossary/tax/irs-publication-550

https://investors.wiki/irs-pub-550

https://www.irs.gov/publications/p550

https://www.irs.gov/publications