MTD ITSA software for sole traders & self-employed UK drivers
Making Tax Digital for Income Tax launches on 6 April 2026. The first quarterly submission deadline is 7 August 2026 for anyone whose self-employment plus property income exceeded £50,000 in 2024-25. Most mileage-tracking apps are not MTD-compliant on their own. MileClear is being built so the tracking and the submission live in one place.
The submission window covers 6 April – 5 July 2026 (Q1 of the 2026-27 tax year). If you are over the £50,000 threshold this is your first MTD ITSA filing.
Who has to comply — and when
MTD ITSA is being phased in by income threshold. The threshold counts your self-employment income plus property income from the prior-but-one tax year (so the April 2026 launch tests against your 2024-25 figures).
Below £20,000? You stay on regular Self Assessment for the foreseeable future. HMRC has signalled the threshold may drop further in time, but no firm date below £20,000 has been published.
What "MTD-compliant software" actually means
The phrase is everywhere right now. Most apps in the mileage and accountancy space are scrambling to claim it. Worth understanding what it concretely requires:
- OAuth integration with HMRC's MTD APIs. Your software has to redirect users to HMRC's consent page, exchange an authorisation code for tokens, and then call HMRC's servers on your behalf. No screen-scraping, no manual figure entry into a portal.
- Fraud-prevention headers on every call. HMRC mandates 9–15 specific HTTP headers (device fingerprint, public IP, screen size, OS family, vendor identification, and more) on every MTD API call. The format is strict and is validated automatically. Get any of them wrong and the call is rejected.
- Quarterly submission against HMRC's schema. Your software has to map your real business data — turnover, expenses by category, mileage deduction — to the exact JSON shape HMRC's Self Employment Business API expects. Get the mapping wrong and you submit incorrect tax figures, with personal liability if HMRC investigates.
- HMRC production accreditation. Sandbox access is open to anyone. Production access requires a security review by HMRC that takes 3–8 weeks: terms of use, fraud-prevention header evidence, security policy, personal data handling, accessibility (WCAG 2.2 AA), penetration testing.
That last one is why most mileage trackers don't bother. The accreditation review is a real piece of work, and the ongoing maintenance to keep up with HMRC schema changes is non-trivial.
Why most mileage trackers won't file your MTD ITSA return
The well-known international mileage trackers — the ones that come up first when you search "UK mileage tracker" — were built around a simpler product shape: track miles, generate a CSV or PDF, hand it to your accountant. That's the entire workflow.
MTD ITSA changes the shape of the workflow. The submission is the product. A mileage figure on a CSV is no longer the end-state — it has to flow into a quarterly filing that lives inside MTD-compliant software.
The realistic UK options for sole traders right now look like:
- Full accountancy suites (Xero, FreeAgent, QuickBooks, Sage). MTD-compliant for submission. No native UK gig-driver mileage tracking; you bolt on a separate tracker and import.
- Bridging software (123 Sheets, Vital Tax, etc.). Takes a spreadsheet and pushes it to HMRC. Fine if you trust your spreadsheet, less ideal if you want a coherent product.
- Mileage-first apps with MTD bolted on — a small but growing category. MileClear is in this bucket, built UK-first with HMRC integration as a native workflow rather than an export.
The two-app approach (tracker + accountancy suite) works but is the most common cause of frustrated UK gig drivers we hear from. The mileage data ends up in a spreadsheet, someone forgets to update the bridging software, and the quarterly deadline arrives with mismatched figures.
How MileClear is preparing for the 7 August 2026 deadline
MileClear is being built so the UK gig driver journey is one app: track every mile automatically, classify trips by platform (Uber, Deliveroo, Just Eat, Amazon Flex, DPD, Evri, Stuart, Gophr, Yodel), capture earnings via Open Banking or CSV import, log allowable expenses, and submit the quarterly figures to HMRC without leaving the product.
Where MileClear's MTD ITSA build is today
- Phase 1 shipped: HMRC OAuth connection, fraud-prevention header builder, validated 0-error against HMRC's Test Fraud Prevention Headers API.
- Phase 2 in progress: Obligations API, Business Details API, Self Employment Period read APIs all live in production. Create Period Summary submission flow is the next build.
- Phase 3 starting: Mobile UI for Connect HMRC, NINO entry, obligations countdown, submission preview, submission confirmation.
- Phase 4 in HMRC's queue: Production accreditation request submitted 8 May 2026. HMRC review is in their MTD IT backlog; expecting 4-8 week turnaround.
- Target release: MileClear 1.2.0 to TestFlight by mid-July 2026, App Store-public ahead of the 7 August 2026 first quarterly window.
We're publishing live progress in our release notes because the deadline is real and you deserve to know what state the software is actually in — not just what the marketing claims.
What MileClear automates for your MTD ITSA filing
The whole point of MTD-compliant software is that you stop copying numbers between spreadsheets. Here's what runs automatically once your quarterly window opens:
Mileage deduction
Every business-classified trip flows into your AMAP deduction at 45p/25p (cars/vans) or 24p (motorbike). Employer mileage rates supported for employees using their own car. The figure goes straight into HMRC's expenses.carVanTravelExpenses field.
Earnings by platform
Open Banking auto-import (TrueLayer) or CSV upload. Each transaction is tagged to the platform that paid it (Uber, Deliveroo, Just Eat, Amazon Flex, DPD, Evri, Stuart, Gophr, Yodel, Freelance). Total turnover lands in HMRC's incomes.turnover.
Expense categorisation
Every expense category (parking, tolls, phone, equipment, food/subsistence with HMRC SE57240 warning, accommodation, professional fees, etc.) is mapped to the right SA103S box (17 motor / 18 admin / 19 other). No manual reconciliation.
Obligations countdown
Live countdown to your next quarterly submission, sourced directly from HMRC's Obligations API. No surprise deadlines.
Preview before submitting
Every figure shown side-by-side with where it came from before you authorise the submission. If something looks wrong, you fix it in MileClear, not in a spreadsheet.
End-of-year final declaration
BSAS (Business Source Adjustable Summary) plus Individual Calculations APIs for the year-end reconciliation. The whole annual cycle in one product.
MTD ITSA FAQs
What is MTD ITSA?
Making Tax Digital for Income Tax Self Assessment (MTD ITSA, sometimes shortened to MTD for Income Tax or MTD IT) is HMRC's new way of receiving tax information from sole traders and landlords. Instead of one Self Assessment return at the end of the tax year, you submit a digital quarterly summary every three months from MTD-compliant software. There is also an end-of-year final declaration. The system has been delayed several times. It now launches on 6 April 2026.
Who has to comply with MTD ITSA in 2026?
From 6 April 2026, MTD ITSA applies to sole traders and landlords whose combined self-employment income plus property income exceeds £50,000 in the 2024-25 tax year. From 6 April 2027 the threshold drops to £30,000. From 6 April 2028 it drops to £20,000. If you are below the relevant threshold you stay on regular Self Assessment for now.
When is the first MTD ITSA quarterly submission due?
The first quarterly window of the new regime covers 6 April to 5 July 2026. The submission deadline for that quarter is 7 August 2026. Subsequent quarters end on 5 October, 5 January, and 5 April, with submission deadlines roughly one month later. The end-of-year final declaration for 2026-27 is due by 31 January 2028.
What does MTD-compliant software actually have to do?
Three things. First, integrate with HMRC's MTD APIs over OAuth — your software talks to HMRC on your behalf, you don't type figures into a portal. Second, transmit nine to fifteen mandatory fraud-prevention headers on every API call (device, location, software identification). Third, submit a digital quarterly summary that maps your business income and expenses to HMRC's schema. A spreadsheet, even a digital one, is not compliant on its own. You either need MTD-compliant accounting software or 'bridging software' that links your spreadsheet to HMRC.
Why don't most mileage trackers do MTD ITSA submissions?
Mileage tracking is a different problem from tax submission. Most apps in this category — including the well-known international ones — focus on producing a CSV or PDF of your business mileage and stopping there. Submitting that data to HMRC requires an entirely separate workstream: HMRC Developer Hub registration, OAuth implementation, fraud-prevention header generation, sandbox testing, and a 3-8 week production accreditation review. Few mileage trackers have built this infrastructure because their core product is the tracker, not the filer.
Can I keep using my existing mileage tracker and submit elsewhere?
Yes, but you will be juggling at least two pieces of software. Your tracker generates a mileage figure (or an export); a separate piece of MTD-compliant accounting software submits to HMRC. Most accountancy packages — Xero, FreeAgent, QuickBooks, Sage — support MTD ITSA submissions but do not track mileage natively. The disjointed workflow is exactly what UK gig drivers tell us they want to avoid. MileClear is being built so the mileage and the submission live in the same place.
What if I miss the 7 August 2026 deadline?
HMRC has confirmed a points-based late submission penalty. You accumulate one point per missed quarterly submission. At four points (sole trader on quarterly cadence) HMRC issues a £200 fine, with further £200 fines for each subsequent late submission until you reset by submitting on time for a defined period. There is also a separate late payment regime if you owe tax. The simpler answer is: file on time. The first deadline is the one most people will miss because the regime is brand new — set up your software early.
Do I still need to do a Self Assessment return?
Not in the same way. Under MTD ITSA the four quarterly submissions plus an end-of-year final declaration replace the annual Self Assessment return for affected sole traders. You won't be filing two things; you'll be filing the new MTD ITSA workflow only. If you have other income (salary, dividends, capital gains) the final declaration is where that goes.
When will MileClear's MTD ITSA submission feature be available?
MTD ITSA submission is in development now and targeted for the 1.2.0 release, on TestFlight by mid-July 2026, well ahead of the 7 August quarterly deadline. The OAuth flow, fraud-prevention headers, Obligations API and Self Employment Business read APIs are already live in production sandbox. The Create Period Summary submission flow and mobile UI are next. Production accreditation has been requested from HMRC and is in their review queue.
Get ahead of the 7 August deadline
Start tracking your mileage and platform earnings now so your first MTD ITSA submission is one tap, not one panicked weekend in late July. MileClear is free for tracking, classification, and tax-readiness tooling. The MTD ITSA quarterly submission lands in 1.2.0.
Install MileClear on iOSRelated guides
- HMRC mileage rates 2025-26 and 2026-27 — the AMAP figures MileClear uses to calculate your deduction.
- Business mileage guide — what counts as a business trip for tax purposes.
- What counts as business mileage — the trickier edge cases (commuting, mixed-use trips, charity volunteering).
- MileClear vs MileIQ — honest UK-tax-tooling comparison with the most-known alternative.