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Understanding cost basis for crypto conversions in 2025

Confusion Rises Among Crypto Holders Over Cost Basis in Conversions | Tax Implications Intensify

By

Lina Chen

Jan 5, 2026, 08:40 AM

Edited By

Omar El-Sayed

2 minutes reading time

A person reviewing crypto transaction records with a laptop and calculator, focusing on Ethereum and Solana conversions

Recent conversations on user boards reveal the complexities of calculating cost basis for crypto conversions, specifically following a conversion to Solana in June 2025. The mix-up highlights a broader issue affecting holders gearing up for tax season.

A user, with crypto investments dating back to 2021, expressed confusion over the specific Ethereum (ETH) chunks sold during a conversion transaction. After examining transaction details, they confirmed a $38 gain from their conversion but questioned why certain ETH they purchased were utilized for the conversion.

  • Cost-basis methods: The user stated that despite understanding HIFO (Highest In, First Out), FIFO (First In, First Out), and LIFO (Last In, First Out), they were unclear which method was applied in their case.

  • Coinbase's defaults: Many users believe that Coinbase defaults to HIFO for transactions. Still, the individual questioned this given their history of purchasing ETH at prices exceeding $3,000.

  • Mixed purchases used: Complicating matters, the conversion pulled from two different transactions that occurred prior to their conversion in 2025, but their significance remains unclear to them.

"The specific units sold are based on the selected cost-basis method in place during the trade execution," a comment noted.

Commenters on the forum responded with advice on regulatory obligations, emphasizing the importance of consulting tax professionals for personalized guidance. They pointed out the IRSโ€™s available guidelines for reporting taxes from virtual currency activity.

"Coinbase disclaims responsibility for your tax return accuracy, advise engaging with a qualified tax advisor."

Most commenters echoed the sentiment that interpretation of tax laws surrounding cryptocurrency can be tricky, especially for newcomers to the space. A handful suggested the default method is FIFO.

Key Insights:

  • ๐Ÿš€ Confusion persists about how conversions impact tax obligations.

  • ๐Ÿ” Users suggest that Coinbase defaults may impact which units appear in conversions.

  • ๐Ÿ’ก Seeking professional tax advice is deemed crucial for accurate filing.

As the crypto market continues to evolve, understanding the implications of various cost-basis methods on conversions will be key for many investors preparing for the new tax requirements ahead.

Visit the IRS guidelines for reporting activities regarding virtual currencies.

Shifting Sands Ahead

As the crypto landscape shifts, there's a strong chance that many investors will face increased scrutiny when reporting their costs. Given the complexities of tax obligations tied to individual transactions and conversions, around 70% of people are expected to seek professional guidance before the April deadlines. With further IRS clarifications likely in the upcoming months, investors might benefit from clear regulations, making it easier to choose a cost-basis method that accurately reflects their activities. In conjunction, anticipation is building around crypto platforms potentially updating their reporting tools to mitigate confusion, especially as the market trends toward more regulations.

An Unexpected Echo from History

In a less obvious comparison, consider the transition from paper to digital record-keeping in businesses during the late 1990s. Just as companies grappled with tracking financials in a new electronic landscape, crypto investors now face similar challenges in managing their tax obligations amid ever-evolving digital currencies. Much like those businesses had to re-evaluate their accounting methods, todayโ€™s crypto holders must reassess their strategies around cost basis to ensure accuracy in their reports. The shift might seem daunting, but just as firms adapted to digital tools, people engaged in crypto can find their footing amid these regulatory changes.