HIFO

Highest-In, First-Out — a cost-basis accounting method that assumes the units sold are the ones with the highest acquisition cost. For crypto in rising markets, HIFO minimises reported gains (by matching disposals against the most expensive units acquired) and is therefore often the lowest-tax method where it's permitted. HIFO is typically only available under specific-identification rules where the taxpayer can demonstrate they tracked the exact lot disposed. Not all jurisdictions allow HIFO; check the specific rules in yours, and consult a tax professional.