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PRIVATE BETA PrompTax Logo

The CGT software accountants actually want

We're building AI-powered capital gains tax software for UK professionals. Upload broker statements, AI extracts the trades, you verify, and our calculation engine does the rest.

BUILT FOR PROFESSIONALS

The CGT platform your practice deserves

The tools haven't kept up with the complexity. Your time is worth more than this.

Hours → Minutes

What takes hours in spreadsheets takes minutes here. AI extracts trades from broker statements—you review and confirm.

Dramatically faster workflow

All clients. One place.

Manage your entire client portfolio from a single dashboard. Track Section 104 pools, generate reports, and keep everything organised.

Multi-client support included

SA108 ready

Same Day Rule, 30 Day Rule, Section 104 pooling—applied per HMRC guidance. Review outputs and export for Self Assessment.

Built on HMRC rules

Built for members of

ICAEW • ICAS • ACCA • CIOT • AAT
THE PROBLEM

The tools haven't kept up

Accountants pride themselves on precision. Yet the tools available force imprecision.

Spreadsheets. Still.

Manually keying trades, maintaining Section 104 pools by hand, copy-pasting between tabs. One wrong formula and everything downstream is wrong.

Clients turned away

Complex trading behaviour means hours of extraction and calculation. Many practices simply can't justify the time—so clients go underserved or worse, don't declare at all.

Options? Forget it.

Section 144 for exercise/assignment, Section 148 for written options—most tools don't even attempt this. Clients with options are on their own.

Quotes that scare clients off

When you quote realistically for the hours involved, clients baulk. They try DIY, make mistakes, or simply don't declare. Nobody wins.

PrompTax exists because we couldn't find a tool that does all of this properly.

Why Choose Promptax?

Professional-grade features you won't find elsewhere

Multi-File PDF & CSV
Upload multiple broker statements at once. AI extracts trades from PDFs and CSVs—you review and verify before calculations run.
HMRC Matching Rules
Same Day Rule, Bed & Breakfast (30 Day) Rule, and Section 104 pooling—all applied automatically per HMRC guidance.
Full Options Support
Handles equity options including Section 144 (exercise/assignment) and Section 148 (written options). Most CGT tools can't touch this.
Multi-Currency Conversion
Automatic GBP conversion using historical exchange rates on trade dates. Supports USD, EUR, and other major currencies.
Continuous Pool Ledger
Section 104 pools persist across tax years. Track cost basis history, carry forward balances, and maintain a complete audit trail per instrument.
ISA Account Detection
Automatically identifies ISA and tax-exempt accounts. Flags exempt trades so you don't accidentally include them in CGT calculations.
Audit-Ready PDF Reports
Generate detailed computation proofs showing exactly how each gain/loss was calculated. Every matching decision documented.
Cryptographic Verification
Reports include SHA-256 hashes for tamper-evident provenance. Verify authenticity anytime through our verification portal.
SA108 Ready Output
Outputs map directly to SA108 fields. Total gains, losses, and allowance utilisation—ready for Self Assessment filing.
Intuitive Verification UI
Where you'll spend most of your time. Clean, intuitive interface for reviewing AI-extracted trades. Edit inline, exclude items, and verify with confidence.
Daily Spot FX Rates
Daily spot FX rates automatically integrated for all major currencies including USD, EUR, and more. Accurate conversions on the actual transaction date.
Capacity Multiplier
Take on clients you'd otherwise turn away. Complex portfolios that can take days or weeks for a team of people to accurately calculate can now be done by one person in minutes. Expand your practice, not your headcount.
Client Management Portal
Comprehensive client portal for managing all client details and Section 104 pools. Add opening positions from prior years, spousal transfers (no gain/no loss), or probate holdings at market value—pools automatically update and carry forward year-to-year.
Cross-Year 30-Day Matching
Detects Bed & Breakfast matching across tax year boundaries and retroactively corrects Section 104 pools. Generates detailed amendment reports showing exactly what tax is owed or reclaimable from HMRC with clear guidance.
Corporate Actions Support
Handles stock splits, reverse splits, and company name/ticker changes automatically. Mergers and rights issues coming in future updates. Keeps your cost basis accurate through corporate restructurings.
Intelligent Trade Pairing
Handles ledger-format documents with single trade legs (opens/closes only). Pairing engine automatically matches acquisitions with disposals, identifies orphaned positions to carry forward, and flags missing cost basis entries requiring pool data.
Loss Carry Forward Tracking
Automatically tracks unused capital losses year-to-year. You decide whether and how much to apply against current year gains, with full audit trail showing how losses were utilised and what remains available for future years.
Historic Tax Band Detection
Automatically detects and applies correct tax bands and annual exempt amounts across 6 tax years (back to 2021-2022). Perfect for retroactive calculations—no manual lookup of historic thresholds required.
NOW ACCEPTING TESTERS

Join the Private Beta

We're looking for accountants and tax advisers who want to help shape the product

What we're looking for

Accountants or tax advisers

Who handle CGT calculations for clients with equity trades

Willing to share feedback

Tell us what works, what doesn't, and what's missing

Patient with rough edges

It's a beta—things will break, and we'll fix them quickly

What you get

Early access to the platform
Direct line to the founder
Influence on features and roadmap
Priority support when things break

Where we are

Core CGT Engine

Working

AI Extraction

Working

Polish & Edge Cases

In progress

The platform handles equities, options, and multi-currency trades. We're refining the experience based on real-world usage.

Ready to try it?

We're keeping the beta small so we can work closely with each tester.

Request Access