Capital gains tax, done in the right order

Calculate your Irish CGT now. File the CG1 when it's due.

Export the transaction history from almost any broker, exchange or crypto wallet, then upload that file. We read it, ask you to confirm what happened, and build a ledger you can trace for both the payment and the return. We never want your keys or the wallet itself.

Coming soon See how the dates work →
Quoted shares/Spot crypto/2025 & 2026
Deadline checker
When did you sell?
Pay your CGT by
15 December 2026
A sale from January to November falls in the initial period.
File your CG1 return by
31 October 2027
The year after you sold. A separate step.
Dates come from the same tax calendar the app calculates against, so they never drift.

You pay first and file later. Most people are surprised by this.

Example · 2026 disposals
01 · Pay
15 December 2026
CGT on disposals from January to November 2026.
02 · Pay
31 January 2027
CGT on any December 2026 disposals.
03 · File
31 October 2027
Your 2026 CG1 return, nearly a year after you paid.

Paying in 2026 files nothing. Miss the gap between these two dates and you miss a deadline. Why the dates differ →

How it works

From a messy export to a return you can stand over, in four steps.

01
Upload your file

A spreadsheet, a CSV, a PDF statement or a photo of one, from almost any broker, exchange or wallet. Never keys or logins. Stored privately, scanned on the way in.

02
We interpret it

Our software reads each row and proposes what it means: a buy, a sale, or a swap.

03
You confirm

Nothing is calculated until you have looked at each proposal and told us it is right.

04
We calculate & prepare

A deterministic engine computes the tax and prepares the CG1 from the same confirmed ledger.

Every figure is traceable

No number appears that you can't trace back to the row it came from.

An AI model reads your files; reviewed rules and code decide what you owe. Not a model, and not guesswork. If your file doesn't say what a withdrawal was, we ask you, and we never turn a missing value into a zero.

Row from fileProceedsGain
ETH → EUR€4,120€980
RYAAY sale€6,540€1,730
BTC → ETH swap€2,300−€140
Net chargeable gain€2,570
How this works, honestly

We interpret. You confirm. The code calculates.

We read; you confirm

Our software drafts your transactions; nothing is a fact until you confirm it.

Deterministic by design

Code computes the tax against reviewed, versioned rules.

Assumptions are never silent

Where a purchase is missing we treat it as costing nothing, say so, and repeat it on your return.

Independent of Revenue

We prepare documents for you to review and sign. We do not file for you.

Find out if we support your case before you pay a cent.

A few plain questions tell you whether CG1 Assist fits: quoted shares and spot crypto for Irish individuals, where your records show what you paid.

Coming soon