™If adjusted basis appears in a quote, filing or account screen, read it together with the instrument, timeframe and calculation method.
Taxes & Account Rules
Adjusted basis
An investment’s original tax basis after required increases or decreases, including certain wash-sale adjustments.
Plain-English context
Why it matters
This term is part of the language used to describe ownership, pricing, transactions and investment outcomes.
Assuming Adjusted basis has one universal interpretation without checking the source, rules, timeframe or methodology.
Use current definitions. Product terms, tax treatment and market rules can change. Confirm important details with official disclosures, regulators and regulated providers.