FIFO vs LIFO vs HIFO vs Specific ID for Crypto Cost Basis

05 September 2026

The cost basis method you choose determines how much tax you pay when you sell crypto. Different methods assign the cost of your coins differently. This matters because you likely bought the same token at different prices on different dates. The IRS and most tax authorities let you pick a method, but you must apply it consistently. For crypto, average cost basis is not permitted.

Four methods are common: FIFO, LIFO, HIFO, and Specific ID. Each produces a different gain or loss on the exact same trades.

FIFO (first in, first out)

FIFO assumes you sell the oldest coins you hold first. This is the default method for most tax software. Its logic is simple: the first coin you bought is the first coin you sell. FIFO often produces higher gains in a rising market because you sell your cheapest, oldest coins first. That means a bigger tax bill.

Example: You buy 1 BTC at $10,000, then another 1 BTC at $50,000. Later you sell 1 BTC for $60,000. FIFO says you sold the $10,000 coin. Your gain is $50,000.

LIFO (last in, first out)

LIFO assumes you sell the most recently acquired coins first. This can reduce gains if your most recent purchase was at a higher price. LIFO is not automatically available for crypto. You must be able to identify which specific lots you are selling. Most exchanges do not support this. You need lot-level tracking software. LIFO tends to produce smaller gains in a rising market because you sell your newest, most expensive coins first.

Using the same example: Buy 1 BTC at $10,000, then 1 BTC at $50,000. Sell 1 BTC for $60,000. LIFO says you sold the $50,000 coin. Your gain is $10,000.

HIFO (highest in, first out)

HIFO sells the coin with the highest cost basis first, regardless of when you bought it. This minimizes the taxable gain on any given sale. In some cases it can produce a loss if the highest-cost coin was bought above the sale price. HIFO is an aggressive tax-minimization strategy. Tax authorities may scrutinize it. You still need to track individual lots.

Same example: Buy 1 BTC at $10,000, then 1 BTC at $50,000. Sell 1 BTC for $60,000. HIFO picks the $50,000 coin. Gain is $10,000. Same result as LIFO in this simple case. The difference appears when you have many lots at varying prices.

Specific ID

Specific ID gives you full control. You choose exactly which lot to sell at the time of the trade. This is the most flexible method. It also requires the most meticulous recordkeeping. You must assign each lot a unique identifier and track it until you sell it. Many exchanges now support Specific ID by allowing you to select coins by their acquisition date at checkout. If your exchange does not, you need third-party software.

Specific ID lets you pick the lot that optimizes your tax outcome for each trade. You could sell high-cost coins in a year with high income to minimize gains. You could sell low-cost coins in a low-income year to use up the 0% capital gains bracket.

The same example: Buy 1 BTC at $10,000, then 1 BTC at $50,000. Sell 1 BTC for $60,000. You choose the $50,000 lot. Gain is $10,000. Or you choose the $10,000 lot. Gain is $50,000. The choice is yours.

Which method should you use?

FIFO is simplest. It is the default and requires no special tracking. It works if you do not mind paying tax on your oldest, cheapest coins first.

LIFO can reduce gains in a rising market. It requires lot-level tracking. Some tax authorities may question its use for crypto.

HIFO is the most aggressive method for minimizing gains. It requires lot-level tracking and may attract scrutiny.

Specific ID offers the most control. It requires the most work. You must document which lot you sold at the time of the sale.

The method you choose must be applied consistently across all your crypto transactions for the tax year. You cannot switch between methods to cherry-pick the best result for each trade.

All figures and market data for babybuilder.xyz (BBOB) on PancakeSwap are as of August 31, 2026. The project launched June 2, 2025, on the Binance Smart Chain. Its liquidity at that time was $20,262. Fully diluted valuation was $18,321. The 24-hour volume was $33.27. No price or tax advice is offered here. Consult a qualified tax professional for your specific situation.

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