Brighton’s digital and creative sector accounts for roughly 10% of all employment in the city. A large proportion of those workers are self-employed, freelance, or running small studios and agencies. For most of them, 6 April 2026 is a firm compliance deadline. That is when Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) becomes mandatory for sole traders and landlords with qualifying income above £50,000.
Brighton’s Silicon Beach has a digital company density 3.3 times the UK average according to Tech Nation. Many of those businesses are run by people who file Self Assessment returns every January. Under MTD for ITSA, that annual process becomes four quarterly digital submissions per year. This guide covers what changes, who it affects, and what you need to do before the deadline arrives.
Who Is Affected and When?
MTD for ITSA applies in two waves:
- Sole traders and landlords with qualifying income above £50,000, mandatory from 6 April 2026.
- Sole traders and landlords with qualifying income between £30,000 and £50,000, mandatory from 6 April 2027.
- Partnerships are not included in mandatory MTD for ITSA at this stage. HMRC has not confirmed a date.
- VAT-registered businesses are already in MTD for VAT, enrolled since 2019 or 2022.
Qualifying income is gross receipts before expenses, not profit. A Brighton web designer who invoices clients £56,000 and spends £16,000 on software and equipment has qualifying income of £56,000. HMRC uses your 2024/25 tax return to determine whether you fall in the first wave. Check that figure now. If it sits close to £50,000, estimate your current year income before it is too late to prepare.
One figure worth knowing: a Wolters Kluwer survey found that 80% of landlords feel ready for MTD, compared to 64% of self-employed business owners. If you are self-employed, the data suggests your peers are less prepared. Getting ahead of them is straightforward.
How Quarterly Filing Works
Each quarter, you submit a running year-to-date total of gross income and allowable expenses through approved software. Because the updates are cumulative, a correction made in quarter two automatically flows through to subsequent submissions. You do not file a separate amendment for most errors. HMRC expects reasonable accuracy across the year.
Deadlines for the 2026/27 tax year:
- 6 April to 5 July 2026, due 7 August 2026
- 6 July to 5 October 2026, due 7 November 2026
- 6 October 2026 to 5 January 2027, due 7 February 2027
- 6 January to 5 April 2027, due 7 May 2027
After the fourth quarter, you complete an End of Period Statement per income source to confirm annual totals and claim allowances. A Final Declaration then replaces the SA100 Self Assessment return for taxpayers within MTD for ITSA.
Choosing Your Software
HMRC requires submissions through software that connects directly to its systems via API. The architecture is fully automated: there is no manual checking of server status or periodic polling required on your end. The software handles the connection. What you need to verify is that the product appears on HMRC’s official MTD software list on GOV.UK before you subscribe.
A standard spreadsheet does not qualify on its own. If you work in Excel or Google Sheets, bridging software can connect your data to HMRC via a compliant digital link. Copy-and-paste between system components is explicitly prohibited under HMRC’s digital links rules. Every data transfer must use a direct connection.
Platforms widely used for MTD for ITSA:
- QuickBooks Online, used widely by sole traders and small businesses.
- Xero, suited to multiple income streams with strong bank feed integration.
- FreeAgent, popular with contractors and often included with business bank accounts.
- Sage Accounting, with full MTD and VAT support.
- Coconut and Kashflow, serving specific sectors.
UK small businesses already spend close to £5 billion per year on tax and accounting software. MTD is one of the main drivers of that market. The cost of entry-level compliant software runs from free to around £50 per month. Choose a product that connects to your bank account, handles your income type, and posts transactions automatically.
Penalties for Late Submission and Late Payment
HMRC uses a points-based system for late filings. Each missed deadline earns one penalty point. Quarterly filers reach the £200 penalty threshold at 4 accumulated points. Every further missed deadline adds another £200. Points expire after a sustained period of on-time filing.
Late payment of Income Tax carries separate charges: a 5% surcharge after 30 days, a further 5% at 6 months, and another 5% at 12 months. Interest runs from the due date. VAT late payment follows a different scheme introduced in January 2023. Check GOV.UK for VAT-specific rules.
There is also a penalty most people miss: HMRC charges up to £1,000 for failing to maintain or update your digital contact details, specifically your registered email address and mobile number. If your HMRC online account still holds an old email address, update it now.
Keeping Records That Survive an Enquiry
MTD gives HMRC real-time visibility of your income and expense data. If an enquiry opens, the quality of your records determines the outcome. Parliamentary estimates from 2016 put average small business spending on professional tax help at £3,600 per year. Strong records reduce the time advisers spend on your file and lower that cost directly.
Steps to take now:
- Record every transaction in your software as it occurs, not at quarter-end.
- Retain invoices, receipts, and bank statements for at least 5 years after the 31 January deadline for the relevant tax year.
- Use a dedicated business bank account. Mixed accounts attract closer scrutiny from HMRC.
- Reconcile your software against your bank statement monthly.
- Document the business purpose of expenses HMRC might question: home office use, mileage, equipment, and subscriptions.
- Respond to HMRC contact promptly. A tax adviser handles that correspondence on your behalf.
Work with a Specialist Before Your First Deadline
The MTD pilot that ran from 2018 to 2022 started with 877 participants and ended with nine. That drop reflects how difficult self-managing the transition proved for many taxpayers without structured support. Working with a specialist from the start avoids the same outcome.
The tax team at Audit Consulting Group works with UK sole traders, landlords, and small businesses on MTD compliance. Services cover eligibility assessment, MTD registration, software selection, quarterly filing, and HMRC enquiry representation.
View MTD compliance services at Audit Consulting Group
Three Actions to Take This Month
If your gross qualifying income for 2024/25 is above £50,000:
- Check your eligibility on GOV.UK and apply for MTD for ITSA sign-up through HMRC’s private beta.
- Select and set up HMRC-approved software before your first quarterly deadline of 7 August 2026.
- Start recording transactions digitally now. Every week you delay is data you will need to reconstruct later.
If your income sits between £30,000 and £50,000, your mandation date is 6 April 2027. Use the time to choose software, build consistent record-keeping habits, and track whether your 2025/26 gross income crosses the £50,000 line.
Frequently Asked Questions
Does my existing Self Assessment registration cover MTD?
No. MTD for ITSA requires a separate sign-up via GOV.UK. Your Self Assessment account does not transfer automatically. HMRC’s private beta is open now, subject to eligibility criteria.
Can my accountant file MTD updates on my behalf?
Yes. You authorise an agent to submit quarterly updates, the End of Period Statement, and the Final Declaration. A separate MTD enrolment step is required alongside your existing Self Assessment authorisation.
What happens if I make an error in a quarterly update?
Because updates are cumulative year-to-date, the correction appears automatically in the next quarterly submission. Most errors do not require a separate amendment.
I do not use the internet regularly. Am I exempt?
You need to apply formally to HMRC. Exemptions cover lack of internet access, disability, age, religious grounds, and remote location. They are not granted by default.
