Robocount treats supplementary pages as part of the Corporation Tax engine. Each supported page is connected to the CT600 workflow, computation logic, review trail, and HMRC filing output.
Close company loans, s455 tax, repayments, releases, and relief tracking.
CFC charge data, hybrid mismatch indicators, and related Corporation Tax disclosures.
Group relief claims, surrendered losses, carried-forward claims, and consent detail.
Insurance companies, friendly societies, Overseas Life Assurance Business, and OLAB review points.
Charity and CASC exemption claims, qualifying-purpose review, and repayment detail.
Tonnage tax elections, group cases, shipping profits, offshore training allowance, and CT600 review points.
Northern Ireland indicators, trading-activity review, rest-of-UK split checks, and evidence trail.
Cross-border royalty payments, reasonable-belief treaty relief, withholding, and recipient detail.
Ring fence trade profits, financing-cost adjustments, allowances, and supplementary charge payable.
DOTAS scheme references, promoter reference numbers, expected tax advantage periods, and disclosure review.
Restitution interest, specialist tax-charge review, double-count checks, and CT600 reconciliation.
RDEC, SME/ERIS style credit details, payable credit steps, and R&D claim support.
Tax-site evidence, enhanced allowances, capital allowances review, and qualifying-activity checks.
Residential Property Developer Tax, adjusted development profit, allowance, and RPDT payable.
Creative industry relief, AVEC/VGEC, production-level detail, and payable credit cascade support.
What changed after 31 March 2026, why commercial software is now needed, and how CT600 filing works.
Payment timing, CT600 filing dates, late interest, payment evidence, and audit-trail controls.
When a dormant or nil-tax company still needs HMRC review, CT600 filing, or Companies House separation.
Small profits rate edge cases, associated-company checks, threshold review, and CT600 computation workflow.
CT600A timing, section 455 tax, relief claims, L2P, and repayment review workflow.
Trading losses, current-year relief, carry-back claims, carried-forward schedules, and CT600 evidence.
AIA, full expensing, writing down allowances, disposals, pools, and computation review.
Manager review, client sign-off, iXBRL attachments, supplementary-page checks, and filing approval evidence.
Director loans, dividends, payroll, allowances, losses, approval, and payment records for practice files.
Payment references, nil-to-pay cases, refunds, interest, evidence, and post-filing client follow-up.
Return deadlines, payment dates, late filing penalties, determinations, and practice deadline controls.
Overpayments, loss carry-back claims, repayment interest, amendments, and CT600 evidence workflow.
Attachment checks, accounts and computation alignment, online filing obligations, and API-ready return packages.
Threshold reductions, short periods, augmented profits, and small-company Corporation Tax rate review.
Claim notification, additional information, CT600 boxes 656 and 657, CT600L, and approval evidence.
Final accounts, company closure, strike off, stub periods, HMRC filing evidence, and payment checks.
AVEC, VGEC, additional information, project evidence, payable-credit checks, and filing approval workflow.
Validation errors, authorisation checks, iXBRL attachment issues, supplementary-page mismatches, and resubmission evidence.
Repayment claims, overpayments, client communication, HMRC evidence, and bank-detail controls.
Amended returns, iXBRL accounts, computations, approval packs, and submission evidence.
The 12-month amendment window, overpayment relief, underpaid tax disclosure, revised attachments, and client approval.
Claimant and surrendering company checks, consent notices, carried-forward group relief, and replacement claims.
Corporation Tax agent authority, Government Gateway setup, client credential boundaries, and submission evidence.
Company closure, cessation, final accounts, strike-off evidence, payment control, and HMRC filing review.
Associated-company counts, Marginal Relief thresholds, short periods, client declarations, and CT600 review notes.
Close company loan relief, CT600A claims, L2P timing, repayment evidence, and client expectation control.
Claimant and surrendering company checks, consent notices, carried-forward group relief, and replacement-claim audit trail.
Creative industry credit review, set-off checks, additional information, group surrender, and filing approval evidence.
Accounting-period payment references, nil-to-pay cases, overpayments, refund details, and privacy-safe client communication.