Even though most of the headline changes are targeted at individuals and digital reporting, there are important shifts that impact limited companies and business owners in 2026 — and they’re not always obvious unless you’re planning ahead.
📊 1. Digital Filing Changes for Limited Companies
HMRC and Companies House are closing the old joint online filing service from 31 March 2026.
👉 This means that from 1 April 2026, UK limited companies must:
- File annual accounts with Companies House and
- File company tax returns (CT600) with HMRC
via commercial software or agent software, not the free HMRC combined portal.
That matters because:
- You can’t rely on the old free filing system after March 2026
- You must plan commercial software or agent access now
- You may need to download past returns before they become inaccessible
Action point: Check that your accounting software or agent can file both your accounts and your tax return digitally for 2026 onwards.
📈 2. Digital Records for Self-Assessment (Indirect Impact)
While Making Tax Digital (MTD) for Corporation Tax is not being introduced for limited companies, HMRC is rolling out MTD for income tax (ITSA) for individuals and self-employed persons from 6 April 2026.
Although this doesn’t apply directly to your company’s Corporation Tax, it affects:
- Directors’ personal tax reporting
- Shareholder directors with self-assessment income
- Businesses with directors who also earn self-employed income (e.g., consultancy income)
Key thresholds for MTD ITSA from April 2026:
- £50,000+ total self-employed/property income — must record digitally and submit quarterly updates with compatible software.
Action point: If directors submit personal Self Assessment with business income, they must be prepared for quarterly digital submissions from April 2026 — with software, digital records, and planning.
📅 3. Record Keeping & Software Expectations
Even where new mandates don’t apply directly to limited companies (e.g., MTD for CT):
- HMRC expects accurate digital records for all tax obligations
- Directors and agents must use approved software for filing
- Manual or paper-based systems will increasingly be unsupported post-March 2026
This is part of HMRC’s broader digital strategy aimed at:
- Reducing errors
- Increasing transparency
- Speeding up processing
- Integrating digital tax accounts
🗓 4. Penalty & Compliance Culture
HMRC’s new digital systems are linked with:
📍 Points-Based Penalties for Digital Filing
HMRC is moving toward points and penalty regimes for late or missing digital submissions — similar to late filing penalties.
That means:
- Late filings or missing digital updates can lead to penalty points
- Accumulated points → fines and further consequences
- Digital reporting needs to be accurate and timely
This culture shift is important for businesses, agents, and personal Self Assessments.
📅 5. Standard Filing Deadlines (Unaffected But Worth Reminding)
For limited companies, the usual deadlines remain:
- Accounts to Companies House: 9 months after year-end
- Company Tax Return (CT600): 12 months after accounting period ends
- Corporation Tax Payment: 9 months 1 day after accounting period ends
What is changing post-March 2026 is the method of filing, not the deadline dates.
📌 6. Broader HMRC Expectation Themes for 2026
Even beyond specific mandates, HMRC’s general expectations for business owners in 2026 include:
🔹 Accurate, up-to-date digital record keeping
Software-based, audit-ready and defensible in compliance checks.
🔹 Proactive tax planning
Especially as digital data makes patterns and exposures more visible.
🔹 Separation of personal & business exposures
Given increased data integration between tax types (e.g., dividends vs personal tax filings).
🔹 Compliance readiness vs historical compliance
Greater emphasis on forward-looking compliance rather than annual catch-ups.
This mirrors HMRC’s digital transformation strategy and risk profiling approach.
📌 Key Takeaways for Financial & Insurance Limited Companies
Here’s what you should particularly focus on in 2026:
✔️ Switch to commercial or agent filing software (by April 1, 2026)
✔️ Download and archive old HMRC/Companies House filings before retirement of the joint service
✔️ Ensure directors’ personal tax (especially if they undertake consultancy or self-employed income) is MTD-ready where relevant
✔️ Keep digital records that tie directly into software submissions
✔️ Plan for quarterly personal tax disclosures where required
✔️ Don’t assume Corporation Tax will be MTD — HMRC has confirmed it’s not being introduced for company tax (corporate filings continue under current rules)