Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is now live for millions of UK sole traders and self-employed individuals. If you're self-employed with income currently above £50,000 per year, this change fundamentally affects how you report your finances to HMRC. This guide explains what MTD ITSA is, how it works, and what you need to do to comply.
What is MTD ITSA?
MTD ITSA stands for Making Tax Digital for Income Tax Self Assessment. It's the next phase of HMRC's digital-first tax system, building on the successful rollout of MTD for VAT. Instead of filing your Self Assessment return once a year, you'll now provide quarterly updates to HMRC throughout the year, showing your business income and expenses in real-time.
The goal is the same as with MTD for VAT: improve tax compliance, catch discrepancies early, and give HMRC real-time visibility of your finances. It also means businesses can no longer fudge numbers at tax time—the system tracks income and expenses as they happen.
When Did MTD ITSA Start?
MTD ITSA came into effect from 6 April 2026 for most sole traders with income over £50,000. This means when you file your next Self Assessment return (by January 2028 for the 2026/27 tax year), you'll need to have been providing quarterly updates if you're required to comply.
Who Must Comply with MTD ITSA?
MTD ITSA currently applies to:
- •Sole traders with income over £50,000 per year
- •Landlords with income over £50,000 per year
Exemptions include trusts, most entities over state pension age, and certain special situations. You can check if you're affected on HMRC's website.
How Does MTD ITSA Work?
MTD ITSA works in three phases:
1. Quarterly Updates Throughout the Year
You provide quarterly updates to HMRC showing your business income and expenses. These are submitted electronically through MTD ITSA-compliant software. The quarterly periods are:
- •6 April to 5 July
- •6 July to 5 October
- •6 October to 5 January
- •6 January to 5 April
2. End of Year Submission
By 31 January after the end of the tax year, you submit a final end-of-year update to HMRC. This includes any additional information needed for your tax calculation, such as capital allowances, adjusted profit figures, or other adjustments.
3. Tax Year Summary
HMRC uses your quarterly updates and end-of-year submission to calculate your tax liability. You'll still file a tax return form, but much of the data is pre-populated from your submissions.
What Records Do You Need to Keep?
Under MTD ITSA, you must keep digital records of:
- •All invoices issued and received
- •Bank statements and transaction records
- •Receipts and supporting documents for expenses
- •VAT records (if VAT-registered)
- •Capital allowances and asset records
Which Software Do You Need?
You must use accounting software from HMRC's MTD ITSA-compliant list. These include:
- •Xero: Full MTD ITSA support with excellent quarterly update workflow
- •QuickBooks: MTD ITSA-ready with good reporting features
- •Others: Sage, Zoho Books, Countingup, and many more—check HMRC's full list
Key Dates and Deadlines
- •Quarterly updates: Due 1 month and 2 days after the end of each quarter (so by 7 August, 7 November, 7 February, and 7 May)
- •End-of-year update: Due 31 January after the tax year ends
- •Tax return filing: Still due 31 January (combines self-employment page with other income sources)
- •Tax payment: Still due 31 January (plus payments on account if applicable)
MTD ITSA Penalties
Missing MTD ITSA obligations carries penalties:
- •Late quarterly update: £100 per quarter for the first breach (one per tax year max), £200+ for subsequent breaches
- •Late end-of-year update: Similar penalty structure
- •Inaccurate returns: Additional penalties for providing incorrect information
How to Prepare for MTD ITSA
- 1.Check if you're affected: Visit HMRC's guidance to confirm whether MTD ITSA applies to you
- 2.Choose compliant software: Select from HMRC's list of MTD ITSA-compliant platforms
- 3.Migrate your records: Move historical records and set up to track transactions for quarterly reporting
- 4.Set up integrations: Connect your bank, payment processors, and invoicing tools for automatic sync
- 5.Plan your quarterly updates: Set reminders for when quarterly updates are due (5th of July, October, January, April)
- 6.Get support if needed: Consider working with a bookkeeper to handle the administrative burden
Common Concerns About MTD ITSA
Will this increase my tax bill? MTD ITSA doesn't automatically increase tax—it just changes how you report. If you've been underreporting income, it will highlight that, but honest reporting should be unaffected.
What if I miss a quarterly deadline? Missing a deadline triggers a penalty (£100 for the first breach). You can still submit late, but the penalty applies. The key is to plan ahead and hit deadlines consistently.
Will quarterly reporting be time-consuming? With good accounting software and proper record-keeping, quarterly updates take 30-60 minutes. The effort is front-loaded throughout the year rather than crammed into January.
Takeaway
MTD ITSA is now a reality for many UK sole traders. Rather than viewing it as a burden, see it as an opportunity to stay on top of your finances throughout the year. Regular quarterly updates mean no surprise bills at tax time, and your records are always organized and compliant.
At Zenith Accountancy Solutions, we help sole traders navigate MTD ITSA with confidence. From software setup to handling your quarterly submissions and year-end filing, we take the complexity out of compliance. Let's discuss how we can support your business through this transition.