Import Quality
Good
5 parsed rows · 0 warnings
Local processing · Tax preview · Not tax advice
See your crypto gains and losses — both sides, before tax season
Upload your exchange CSV and CoinTaxDelta shows where you earned, where you lost, and which losses may be worth reviewing — then exports clean files. Your CSV stays in your browser.
22
CSV presets
0
Server-side storage
4
Export types
Included
Diagnostics
Lot Simulation
2 matches
FIFO preview transparency
Export Center
JSON + CSV
Full results and diagnostics
Parser Scope
Foundation
22 CSV presets
Transparent lot flow
Review matched BUY and SELL rows before exporting debug-friendly results.
Local-first privacy
Local-first tax preview workflow
CSV processing runs in your browser. CoinTaxDelta does not upload your CSV to a CoinTaxDelta server, stores only lightweight recent-upload summaries in localStorage, and does not save full uploaded files.
Outputs are tax-preview estimates, not tax advice. Generic CSV is recommended; exchange presets are foundation-level examples.
View current support status
Check ready, foundation-level, and coming-soon features.
Product surface
Built for transparent crypto CSV review
CoinTaxDelta focuses on import clarity, local tax preview, and exportable diagnostics.
I
Import Quality Checks
Parser warnings, errors, and quality status make CSV problems visible before users trust any preview output.
P
Parser Diagnostics
Download parser-only JSON diagnostics when malformed files cannot proceed to review.
T
Tax-Lot Simulation
FIFO-style calculation preview shows how SELL rows connect back to available BUY lots.
P
Privacy-First Uploads
CSV files are processed in your browser. CoinTaxDelta stores only lightweight local summary history.
C
CSV and JSON Exports
Export full results, compact summaries, lot breakdowns, and parser diagnostics for review.
F
Foundation Exchange Parsers
Generic CSV is recommended, with 21 foundation-level exchange and platform presets for simple spot-like rows.
New to tax-loss harvesting?
Start with a plain-English guide
Learn the basic idea: you earned here, lost there, and the full picture matters. The guide explains possible loss candidates, exports, and limitations without legal jargon.
How it works
Three steps from CSV to export package
The flow is intentionally read-only: upload a CSV, review the tax preview, and export files without connecting accounts.
1
Download a sample or upload CSV
Start with Generic CSV or one of the synthetic foundation-level exchange samples.
2
Review import quality
Check normalized transactions, warnings, parser errors, and the calculation preview.
3
Export the run
Download JSON, summary CSV, lot CSV, or diagnostics JSON depending on parser outcome.
Product scope
Clear boundaries instead of production promises
This replaces sales claims with an honest view of what CoinTaxDelta includes today, what is planned, and what is intentionally unsupported.
Included now
- Generic CSV upload
- 22 CSV presets including foundation exchange and platform parsers
- Import quality report
- Lot breakdown transparency
- JSON, summary CSV, lot CSV, diagnostics exports
Coming later
- Deposits and withdrawals
- Conversions, staking, rewards
- Pricing integrations
- More real-world CSV variants
- Production tax report workflows
Not supported yet
- Legal-grade tax filing
- FX conversion
- Exchange account linking
- User accounts or database storage
- Payments or production claims
Tax preview only
Outputs are estimates for review purposes. Not tax advice.
- No trade execution
- No account linking
- No automatic filing
Your data stays local
CSV files are read in your browser. CoinTaxDelta does not connect to exchanges, wallets, or trading accounts, and it does not move funds.
- No exchange connection
- No wallet connection
- No trading or fund movement
Try it with sample data
Start with bundled sample data, review import quality, inspect lot matches, and export the result package.