MTD ITSA for sole traders is the requirement to keep digital records of self-employment income and expenses, then submit quarterly summaries to HMRC through compatible software. It applies to any UK sole trader whose 2024/25 gross self-employment turnover exceeded £50,000. The regime started 6 April 2026 and the first submission deadline is 7 August 2026.
Where most sole traders are right now
Three weeks into the new regime, the picture across forums and accountant inboxes is depressingly consistent. Roughly a third of affected sole traders haven't yet picked software. Maybe a fifth haven't formally registered with HMRC. A handful are still hoping the whole thing gets postponed (it isn't going to). And the engaged minority who started in March are mostly fine, working through their first quarter's bookkeeping like grown-ups.
If you're in the first three groups, this guide is the catch-up plan. It's structured as a ten-step path from cold start to first submission. Most steps take an hour or less. The whole thing is achievable in a long weekend if you stop procrastinating.
Step-by-step compliance path
- Confirm you're actually in scope. Pull your 2024/25 SA103 figures. If gross turnover from self-employment exceeded £50,000, you're in. If you also have rental income, the £50,000 test is on combined gross income — but a separate property guide covers that case. For pure sole traders, only the self-employment turnover line matters.
- Pick your software. Don't agonise. The shortlist for sole traders is FreeAgent (free with NatWest/RBS), QuickBooks Sole Trader (£10/month), or Xero Ignite (£16/month). Read the software comparison if you want detail; otherwise default to FreeAgent or QuickBooks. Sign up for a 30-day free trial before committing.
- Set up a clean business bank account if you don't already have one. Mixing personal and business spending in the same account makes MTD categorisation a slow grind. Most challenger banks (Tide, Starling, Mettle) open a free business account in 24 hours.
- Connect your bank feed to your software. All major MTD platforms support feeds from the main UK banks via Open Banking. Reconciliation is much faster with a feed than manual import. Allow 48 hours for the bank to validate the connection on first setup.
- Register for MTD ITSA on gov.uk. Use your existing Self Assessment Government Gateway login. The sign-up flow asks for your business start date, accounting period, and the software provider you'll use. Submission usually takes ten minutes. HMRC confirms by email within 72 hours.
- Categorise your existing 2026/27 transactions. Pull the bank transactions from 6 April 2026 onwards into your software (the feed will do this automatically once connected). Tag each as business income, an allowable expense category, or personal. The first batch takes a few hours; after that it's 15 minutes a week.
- Reconcile to your bank balance as of today. Once everything since 6 April is categorised, the software's bank balance should match your real bank balance. If it doesn't, something's missing or duplicated. Fix this before you trust any figure the software produces.
- Decide cash basis or accruals. Default for sole traders under £150,000 turnover is cash basis (record income when received, expenses when paid). It's simpler and what the software will assume unless you change it. Only switch to accruals if you have substantial work-in-progress at year-end and a strong reason to spread it.
- Run a dry submission for Q1 in late July. Most platforms let you preview what will be submitted before you actually push it. Use this. Check that turnover and expense totals match what your bank account suggests. The first time you'll spot is when an obvious figure looks wrong.
- Submit Q1 by 7 August 2026. The button is genuinely a single click once the figures are reconciled. HMRC returns a confirmation reference within seconds. Save the reference. You're now compliant for Q1.
Quarterly cadence after the first submission
Once Q1 is in, the rhythm becomes manageable. Most sole traders settle into a routine of 30-60 minutes a week categorising bank feed transactions, then a single 90-minute session in the week before each quarterly deadline to review categorisation and click submit. That's it. The software handles the actual API call to HMRC.
| Quarter | Period | Submission deadline |
|---|---|---|
| Q1 | 6 April – 5 July 2026 | 7 August 2026 |
| Q2 | 6 July – 5 October 2026 | 7 November 2026 |
| Q3 | 6 October 2026 – 5 January 2027 | 7 February 2027 |
| Q4 | 6 January – 5 April 2027 | 7 May 2027 |
| Final Declaration | Full 2026/27 year | 31 January 2028 |
What categories do sole traders need to track?
HMRC's quarterly update follows the existing SA103 self-employment categories, just at quarterly cadence rather than annual. Your software will already have these set up. The categories you'll touch most often:
| Category | Examples |
|---|---|
| Turnover | Invoices paid, cash sales |
| Cost of goods sold | Stock purchases, materials, subcontractors directly used in jobs |
| Motor expenses | Fuel, insurance, repairs, or simplified mileage at 45p/25p per mile |
| Premises costs | Rent, utilities, business rates, or use-of-home flat rate |
| Repairs | Tools, equipment maintenance, minor repairs to premises |
| Admin | Phone, internet, software subscriptions, stationery |
| Advertising | Marketing, website hosting, paid ads |
| Travel & subsistence | Train, parking, business meals away from base |
| Other | Anything genuinely business that doesn't fit above |
For a deeper dive into what's actually allowable in each bucket, our guide to allowable expenses covers the full SA103 list with HMRC's current treatment.
Common sole-trader mistakes in the first quarter
Patterns are emerging from the early adopters. Three deserve flagging:
- Treating drawings as an expense. Money you take out of the business for personal use is drawings, not an expense. It doesn't reduce taxable profit. Software usually handles this automatically if you categorise the transaction correctly, but new users frequently mis-tag.
- Forgetting to record cash income. Bank feeds only catch what hits the bank. Cash jobs need manual entry. HMRC has signalled it'll be cross-checking quarterly turnover against industry benchmarks; suspiciously low cash income relative to a trade where it's expected (hairdressing, market trading, mobile services) flags a compliance review.
- Missing the simplified expenses option. If you work from home and drive for business, the flat-rate alternatives (£10-£26/month for home use depending on hours, 45p/mile for the first 10,000 business miles) are usually cleaner than calculating actuals. Most software offers a toggle.
National Insurance and tax: still annual, despite the quarterly cadence
This trips people up. MTD ITSA changes how you report income; it doesn't change when you pay tax. Class 4 National Insurance is calculated annually on your full-year profit and paid alongside your income tax bill on 31 January. Class 2 NIC was abolished for most sole traders from April 2024. Payments on Account remain the same — 31 January and 31 July. See our National Insurance guide for the current rates.
If you missed the 6 April 2026 start date
Don't panic. Three weeks late isn't catastrophic. The action plan is:
- Pick software today.
- Register for MTD ITSA tomorrow.
- Backdate your bank feed to 6 April. All major platforms support 13 months of historical transaction import.
- Spend a weekend categorising the three weeks of transactions you've already racked up.
- You're now caught up, with three months until the first deadline.
The soft-landing period for 2026/27 means missing 7 August won't generate penalty points anyway, so you have margin. Use it without abusing it.
What happens at year-end?
The Final Declaration on 31 January 2028 replaces the traditional Self Assessment return. Because four quarterly summaries are already in HMRC's system, the Final Declaration is largely confirmation rather than fresh data entry. You add any income that wasn't in the quarterly updates (savings interest, dividends, capital gains, employment income from a part-time job), claim any annual allowances (personal allowance, marriage allowance), and submit. Your software handles the heavy lifting.
Bottom line for sole traders
MTD ITSA is more rhythm change than rule change. The actual tax you owe is identical. What's different is that you can't put the books off until January any longer — they need to keep up four times a year. For most sole traders that's a healthy discipline forced on them. The genuine pain is concentrated in the first quarter, especially if you start from a messy baseline. Pick software, register, get Q1 clean, and the rest follows. For the wider regulatory context, the complete MTD ITSA guide covers thresholds, penalties, and what's coming in April 2027.