Guides

Start here

• A bitcoin-only worksheet on your machine
  What the local worksheet is for, and where a free preview already exists elsewhere.
• What records to keep
  Dates, quantities, dollar amounts, and why a lot id in a JSON file is not proof of timing.
• Glossary
  Short definitions for the words these guides use, each linked to the longer page.
• Compare three methods
  Type or paste rows. FIFO, HIFO, and specific identification, with no file upload.

Exchanges

• River CSV to Form 8949
  Account Activity and Bitcoin Activity, row by row, including the fictional 2024 sample.
• River’s Cost Basis column
  What River’s own estimate means, and why BasisFix recomputes instead of reading that column.
• Coinbase CSV to a Form 8949 worksheet
  Transaction history. Buys, sells, sends, and a Convert row BasisFix skips.
• Kraken ledger cost basis
  Ledger rows paired by refid. XBT is read as BTC. A spend has no invented proceeds.
• Cash App bitcoin taxes
  The transactions CSV, a 1099-DA that can omit basis, and sends that never appear on the form.
• Strike bitcoin taxes
  The monthly statement columns. A send is not a sale. Bill pay spends bitcoin.
• Swan CSV exports
  The tax file Swan describes, and the two other headers BasisFix accepts only with stated assumptions.
• Gemini CSV to a Form 8949 worksheet
  Text dates from the ledger. Buys, sells, and transfers. Other coins are skipped.
• Generic CSV mapper
  Name the columns when the file is not one of the exchange headers above.

Methods and lots

• HIFO and FIFO for bitcoin
  Same lots, different year. Neither method invents a cost.
• Specific identification for bitcoin
  How BasisFix names a lot, and what an over-allocation does.
• Pick lots before year-end
  Specific identification is a record from the sale, not a January switch to HIFO.
• Holding period
  Long-term only after the one-year anniversary. A sale on that date is short-term here.
• Self-transfers are not sales
  A matched move keeps the basis. An unmatched send is not proceeds.
• Missing basis and lost lots
  Why the worksheet leaves a hole instead of using zero.
• Bitcoin interest income
  Interest, mining, and referral payouts as ordinary income that open a lot.
• Mining and node income
  Tagged mining is ordinary income and a new lot. An unlabeled routing fee is not reclassified.
• Lightning payments
  Paying a merchant can be a disposition. A transfer to yourself is not, when both sides match.

Forms

• How to file Form 8949 for Bitcoin
  What one sale row needs, and which 2025 box this worksheet writes. The default is I or L.
• Schedule D from this worksheet
  Boxes G through L and the 2025 lines they total into. Line 16 is only BasisFix’s net.
• Form 1099-DA explained
  Proceeds versus basis, which sales the broker rules cover, and what the form leaves out.
• The Form 1040 digital-asset question
  The return asks a yes or no. BasisFix does not answer it.
• Wash sales and bitcoin in 2026
  Section 1091, tokenized securities, and what BasisFix refuses to adjust.
• Like-kind exchange and bitcoin
  Section 1031 is real property after 2017. BasisFix does not defer a bitcoin trade.
• Bitcoin gifts and inheritance
  No carryover basis and no step-up in BasisFix. A gift receive is not automatic income.
• Donating bitcoin
  No charitable deduction and no Form 8283. A donation is not booked as a sale at market value.
• Lost or stolen bitcoin
  No theft deduction and no zero-proceeds sale. The lots stay unresolved.
• State bitcoin taxes, in brief
  No state rates and no state schedules. The federal-style gain is not a state return.

Comparisons

• BasisFix and Koinly
  Entry price, where the file is read, and what Koinly does that BasisFix does not.
• BasisFix and CoinTracker
  One-time versus a paid plan that auto-renews. No rank claim.
• BasisFix and CoinLedger
  Hobbyist at $49 next to a $29 local worksheet, including the refund line on their page.