CCoinTaxDelta

Beginner guide

See the full picture behind your crypto gains and losses

It's easy to focus on winning trades. But gains and losses are often counted together — and the rules differ by country. CoinTaxDelta helps you see both sides, straight from your own exchange files.

Upload a CSVGet a sample first

What CoinTaxDelta does — and doesn't

CoinTaxDelta doesn't trade for you and doesn't give tax advice. It reads your exchange files, shows where you earned and where you lost, highlights losses worth a closer look, and creates clean files — so you can make a more informed decision, or take them to a professional.

Basic concepts

Key terms, in plain language

The simple idea

Imagine you earned 1,000 on one coin but lost 1,000 on another. Look only at the winner and it seems like you made 1,000. But your full picture is both sides: 1,000 earned here, 1,000 lost there. In many countries, realized gains and realized losses can be looked at together — so your taxable result may be closer to your gains minus your realized losses. In that example, the taxable amount could be much smaller, maybe even close to zero, depending on where you live. Rules differ by country, so a qualified tax professional should confirm what applies to you.

Cost basis

Cost basis is roughly what your crypto cost you. If you bought ETH for 2,000 and later sold it for 2,500, the difference is the possible gain before rules, fees, and matching details.

Tax lot

A tax lot is one chunk of crypto you bought at a certain time and price. If you bought BTC three times, you may have three chunks. When you sell some BTC, the app simulates which earlier chunk is being sold.

Realized vs still holding

If your coin went down but you still hold it, the loss is only visible on screen. If you sell or dispose of it, it becomes a recorded transaction. CoinTaxDelta works with uploaded transaction rows to show what was already recorded and what the numbers look like.

Selling to record a loss

Say you bought Coin B for 2,000 and it's now worth 1,000. While you keep holding it, that 1,000 loss only shows on screen. If you sell, the loss becomes a recorded transaction in your history — and depending on your country, that recorded loss may reduce the taxable result from your profitable trades. Some people then buy back the same coin, or a similar one, because they still want to stay invested. A few things to keep in mind: you're not creating free money — the loss already happened; you're only deciding whether to record it now; and some countries apply waiting periods or special rules to buying back. CoinTaxDelta shows you the numbers before you act. It doesn't decide for you.

This isn't free money

Tax-loss harvesting doesn't turn a bad trade into a good one. If you lost money, you lost money. The point is that the loss doesn't have to go to waste — depending on your country, it may reduce the taxable result from your winners. The goal isn't to hide profit. It's to count both sides: what you earned and what you lost.

How it works

From a messy exchange file to clear records

CoinTaxDelta turns a raw exchange export into a clear view of what you earned, what you lost, and what may be worth a closer look — then gives you clean files to keep or share.

Step 1

Download your trade history

Export a CSV of your trades from your exchange, or start with one of our sample files.

Step 2

Upload it to CoinTaxDelta

Pick the matching parser preset, or use Generic CSV. Your file is read locally in your browser.

Step 3

We check the file can be read

Import Quality flags warnings and errors, so you know whether the results can be trusted before you rely on them.

Step 4

See where you earned and where you lost

The run summary, normalized transactions, and lot breakdown show both sides, not just the winners.

Step 5

Review possible loss candidates

CoinTaxDelta highlights losses worth a closer look. These are for your review, not instructions to buy or sell.

Step 6

Export clean files

Summary CSV for a quick overview, Lot CSV for detailed matching, JSON for structured records, Diagnostics JSON if something did not parse.

Step 7

Plan, or share with an accountant

Use the files for your own planning or hand them to a tax professional. Rules differ by country, so a professional can confirm what applies to you.

Why seeing both sides helps

CoinTaxDelta doesn't create profit. It helps you see your full picture — the trades that made money and the ones that lost it — so you're not planning from half the story.

  • See losses you might otherwise forget.
  • Understand whether those losses may reduce the taxable result from your winners.
  • Avoid planning from only your profitable trades.
  • Spot possible actions before year-end, while you still have options.
  • Hand your accountant cleaner files instead of raw exports.
  • Cut down on manual spreadsheet work.
  • Keep a clear record of what the app could and couldn't read.

Your export files

Summary CSV

A simple spreadsheet overview. Good for personal review or accountant discussion.

Lot CSV

A detailed file showing which earlier buys were matched with which later sells. Good for deeper checking.

JSON

A structured record of the simulation. Good for technical users or future integrations.

Diagnostics JSON

A troubleshooting file. Good when an upload fails or the app cannot understand some rows.