Financial Glossary
HIFO (Highest In, First Out)
HIFO, or Highest In First Out, is a cost basis accounting method in which the units with the highest acquisition cost are deemed to be sold first when a taxpayer disposes of cryptocurrency or other assets. By selling the highest-cost lots first, HIFO minimizes the reported taxable gain -- or maximizes the deductible loss -- on each sale relative to other methods such as FIFO. While HIFO is permitted for crypto under specific identification rules when adequate records are maintained, the IRS requires that the taxpayer be able to specifically identify each lot sold.
Problem & Application
For cryptocurrency investors with a large number of purchases at varying prices -- common among active traders or DCA investors -- the choice between FIFO and HIFO can produce dramatically different taxable gain figures on the same disposal. HIFO systematically pairs each sale with the most expensive lots owned, leaving lower-cost lots on the books longer and deferring gains. The catch is that this requires robust specific-identification records: the taxpayer must be able to document which specific lots were sold, not just assert a method. Using portfolio tracking software that exports lot-level detail and integrates with tax preparation is the practical requirement for HIFO to hold up under IRS scrutiny.
In Short
HIFO is a legally available method that can meaningfully reduce crypto tax liability, but it requires meticulous lot-level record-keeping. The tax savings are only defensible when the documentation standard is met consistently.