Complete CT600 & iXBRL Accounts Software

Everything you need to file corporation tax and accounts for your UK micro-entity. Professional features, built for accountants.

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Core Filing Features

CT600 Corporation Tax Returns

Automatic tax calculations (19%/25% rates), marginal relief (£50k-£250k), associated companies support, extended period splitting, iXBRL computations, direct HMRC submission.

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  • Saves hours of calculations
  • Eliminates errors
  • HMRC compliant

iXBRL Accounts Generation

Generate micro-entity abbreviated accounts, full accounts, dormant accounts, first-year filings with automatic Companies House tagging.

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  • Fully compliant
  • No manual tagging
  • PDF export included

Dual Submission

File CT600 + Accounts in one workflow. Automatic polling for status, email notifications, complete audit trail.

  • One platform for both
  • Real-time status
  • Email updates
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Intelligent Data Entry

Popular

AI-Powered Trial Balance Import

Upload CSV/Excel or paste trial balance data. AI automatically maps to form fields, learns from your mappings, supports multiple formats.

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  • Saves 30+ minutes per submission
  • No manual data entry
  • Gets smarter over time
Time Saver

Fetch Prior Year from HMRC

Automatically retrieve prior year financial data from HMRC. One-click import of previous CT600 submission data.

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  • No manual lookup
  • Guaranteed accuracy
  • Instant import

Company Search & Auto-fill

Search by company name or number. Auto-populate from Companies House API - registered address, SIC codes, directors, filing deadlines.

  • No manual typing
  • Always up to date
  • Pre-validated data

Smart Form Features

LocalStorage auto-save, visual indicators for edited fields, eligibility warnings, real-time validation.

  • Never lose work
  • Catch errors early
  • Guided experience
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Document Generation

Tax Computations (iXBRL)

Automatically generate fully-tagged iXBRL tax computations. Includes profit adjustments, capital allowances, losses carried forward.

  • HMRC recognised format
  • Professional output
  • Audit trail included

Accounts PDFs from iXBRL

Generate PDF versions of your iXBRL accounts for directors' approval and archiving. Clean, professional formatting.

  • Director-friendly format
  • Easy archiving
  • Printable copies

Trial Balance Mapping Documents

Export detailed mapping of trial balance to form fields. Shows AI decisions for audit and review purposes.

  • Full transparency
  • Audit trail
  • Easy review

Submission Receipts

Email confirmations with submission references for HMRC and Companies House. Complete with acceptance status.

  • Proof of filing
  • Reference numbers
  • Status tracking
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Tax Calculations

Corporation Tax Calculations

Automatic CT calculations with 19%/25% rates, marginal relief for £50k-£250k profits, associated companies adjustments.

  • 100% accurate
  • Saves accountant fees
  • Updated for latest rates

Period Apportionment

Automatically split profits when accounting period straddles 31 March rate change date. Whole pounds compliance.

  • HMRC compliant
  • Automatic splitting
  • No manual calculations

Extended Period Handling

Automatically create two CT600 submissions for periods over 12 months. Apportions profits correctly.

  • Fully automated
  • Compliant with rules
  • No extra work
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Multi-User & Multi-Client

For Accountants

Multi-Client Dashboard

Manage multiple companies from one account. Switch between clients easily. View all submissions in one place.

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  • Accountant-friendly
  • One login
  • Organised workspace

Company-Specific Workspaces

Each company gets its own submission history, saved trial balance mappings, and document archive.

  • No cross-contamination
  • Clean separation
  • Easy auditing

User Authentication

Secure email-verified accounts. Password reset flow. Session management for data protection.

  • Data security
  • Professional grade
  • GDPR compliant

Submission History

Access all past CT600s and accounts. Re-download documents anytime. Track statuses across all clients.

  • Complete history
  • Document retrieval
  • Audit ready
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Company Type Support

Trading Companies

Full P&L and balance sheet. Tax computations with adjustments. iXBRL accounts generation.

  • Complete support
  • All document types
  • Professional output

Dormant Companies

Balance sheet only. Dormant statement included. Simplified workflow for non-trading entities.

  • Quick filing
  • Compliant format
  • No unnecessary fields

First Year Filings

Single year accounts from incorporation. No prior year comparatives required. Handles short first periods.

  • Startup-friendly
  • No prior year needed
  • Correct format

Micro-Entity Eligibility

Automatic checking of 2-of-3 criteria (turnover £1m, balance sheet £500k, employees 10). Clear warnings if ineligible.

  • Know upfront
  • No wasted time
  • Accurate eligibility

Ready to Get Started?

Join hundreds of UK micro-entities filing their CT600 and accounts with TinyTax

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