iXBRL Tagging. HMRC & Companies House Compliant. Fixed Pricing Per Entity.
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Taxonomy Selection
& Mapping

The right FRC taxonomy, automatically detected. We match your entity type, accounting framework, and filing requirements to the correct XBRL schema.
In 10 Seconds

Which taxonomy do you need?

Answer 3 questions. We'll recommend the exact FRC taxonomy version for your January 2025 filing.

1
Entity type? Limited company, LLP, charity, CIC, or other?
2
Accounting framework? FRS 102 (full), FRS 102 Section 1A (small), or FRS 105 (micro)?
3
Company size? Micro, small, medium, or large (per Companies Act 2006 thresholds)?
FRC Taxonomy Landscape

Common UK GAAP taxonomies (January 2025)

Entity Type Framework Taxonomy File Our Usage
Limited Company (Small) FRS 102 Section 1A uk-gaap-frs-102-1a-2024-01-01.xsd 45%
Limited Company (Micro) FRS 105 uk-gaap-frs-105-2024-01-01.xsd 30%
Limited Company (Full) FRS 102 Full uk-gaap-frs-102-2024-01-01.xsd 18%
LLP LLP adaptation uk-gaap-frs-102-llp-2024-01-01.xsd 4%
Charity Charities SORP uk-gaap-frs-102-charities-2024-01-01.xsd 3%
Why taxonomy version matters

FRC updates taxonomies annually (January release). Using the wrong version can cause HMRC rejection. We auto-detect your accounting period end and apply the correct year's taxonomy.

Zero Manual Work

How we auto-detect your taxonomy

Companies House API lookup

We query your company number. Get entity type (Ltd, PLC, LLP, CIC), SIC code, filing requirements, exemptions claimed.

Accounts parsing

Read accounting policy note. Identify framework (FRS 102 full/1A/105, old UK GAAP, IFRS). Check if Charities SORP applied.

Size threshold calculation

Apply Companies Act 2006 tests: turnover, balance sheet total, employees. Determine micro/small/medium/large classification.

Taxonomy recommendation

Cross-reference all factors. Present recommended taxonomy with 99.9% confidence. Flag edge cases for human review.

Example: ABC Trading Ltd
  • Companies House: Private limited (Ltd), active, SIC 46900 (wholesale)
  • Accounting policies note: "FRS 102 Section 1A - small entity provisions"
  • Financial metrics: Turnover £7.2m, balance sheet £2.1m, 18 employees
  • Size test: Qualifies as small (2 of 3 thresholds met)
  • Taxonomy selected: uk-gaap-frs-102-1a-2024-01-01.xsd
Not Always Straightforward

Edge cases requiring human review

Transition year

First year adopting FRS 102? Restated prior year? We check if transition disclosures require specific taxonomy elements.

Group accounts

Parent filing consolidated? Subsidiary claiming exemption? Mixed group (some IFRS, some FRS 102)? Each entity needs correct taxonomy.

Overseas operations

Foreign branch or subsidiary? Foreign currency presentation? Taxonomy supports multi-currency but tagging gets complex.

Charity + company

Charitable company (CLG or CIC)? Must apply both Companies Act AND Charities SORP. Specific taxonomy variant required.

Regulated entities

FCA-regulated firm? Bank, insurer, pension scheme? Standard FRC taxonomy but additional FCA NSM/ESEF requirements apply.

Short/long period

Accounting period <12 months (incorporation) or >12 months (change of year-end)? Taxonomy supports it but tags differently.

From Schema to Tags

What happens after taxonomy selection

Step 1

Schema download

We download the selected .xsd file from FRC repository. This contains 1,000+ possible XBRL tags (elements) organized into presentation linkbases.

  • Balance sheet elements (Assets, Liabilities, Equity)
  • P&L elements (Revenue, Expenses, Tax)
  • Note elements (Fixed assets, Debtors, Share capital)
  • Context elements (Entity ID, Period, Units)

FRC Taxonomy Schema (XSD)

Step 2

Element matching

Our AI maps your extracted figures to correct XBRL elements. Uses semantic matching (e.g., "Turnover" → TurnoverRevenue) plus positional logic (balance sheet top = non-current assets).

Example mapping:

Your accounts: "Gross profit: £450,000"

XBRL tag: ukGAAP:GrossProfit contextRef="current" unitRef="GBP" decimals="0">450000

AI-Powered Tag Mapping

Step 3

Validation checks

Run 50+ automated checks against taxonomy rules. Examples:

  • Balance sheet balances (Assets = Liabilities + Equity)
  • Mandatory elements present (CompanyName, EntityID, StartDate, EndDate)
  • Calculation linkbase sums correct (subtotals + totals match)
  • Prior year consistency (same tags used year-on-year where applicable)
  • No orphaned tags (every tag has valid context + unit)

50+ Validation Rules

Taxonomy FAQs

4 Common Questions

HMRC Gateway will reject the filing. You'll see error "Taxonomy mismatch for entity type" or similar. We catch this pre-submission via validation. If we do miss it (rare), we refile at no cost—covered by our accuracy guarantee.

Yes, but we'll flag it with a warning. Example: We detect FRS 102 full but you insist on 1A. We'll ask you to confirm in writing (email) and note the override in our records. If HMRC rejects, refile cost is on you (not us).

Example: Year-end Dec 31, 2024 but filing in Feb 2025 (after Jan 2025 taxonomy released). HMRC accepts either 2024-01-01 or 2025-01-01 version for ~6 months overlap. We use the version valid at your year-end date unless you request otherwise.

Rarely needed for UK statutory filing (FRC taxonomy is comprehensive). If you have truly unique disclosure not covered by standard elements, we can create extension tags—but this requires FCA/HMRC pre-approval and costs extra (£500-2000 depending on complexity). Contact us for feasibility assessment.

No Guesswork

Let us detect your taxonomy in 60 seconds

Upload accounts → Get instant taxonomy recommendation → Proceed to tagging. 99.9% accuracy rate.

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