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    TaxKilnUK tax guidance
    TaxKilnUK tax guidance

    Making Tax Digital ITSA → Quarterly updates Q1-Q4

    MTD ITSA Quarterly Updates — Q1-Q4 Deadlines (7 Aug / 7 Nov / 7 Feb / 7 May) + Cumulative Reporting

    MTD-mandated taxpayers submit four quarterly updates per tax year per qualifying income source (one stream for sole-trade; one stream for UK property; one stream for foreign property where present). The standard quarter ends are 5 July (Q1), 5 October (Q2), 5 January (Q3), and 5 April (Q4); submission deadlines are 7 August, 7 November, 7 February, and 7 May respectively. Following Autumn Statement 2023 the content is CUMULATIVE — each quarterly update reports YEAR-TO-DATE totals, so the Q4 submission effectively contains the full year's data. This means amendments are subsumed by the next quarter rather than requiring separate amendment filings in most cases. Content is TOTALS BY CATEGORY (not transaction-level for HMRC; transaction-level required in software for record-keeping). A calendar quarter election (31 March / 30 June / 30 September / 31 December) is available + may suit landlords with calendar-year tenancies. Cash basis vs accruals basis election follows the standard ITTOIA 2005 rules.

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    Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from your accountant, or contact HMRC. Read our editorial scope →

    In plain English

    Four times a year, you (or your software, automatically) send HMRC a summary of how your sole trade or property business is doing year-to-date. Each submission covers the period from the start of the tax year (6 April) up to the quarter end. Example for the 2026/27 tax year (first MTD year for Phase 1 taxpayers): - Q1 ends 5 July 2026; submission due 7 August 2026; reports income + expenses 6 April-5 July 2026. - Q2 ends 5 October 2026; submission due 7 November 2026; reports income + expenses 6 April-5 October 2026 (Q1 + Q2 combined). - Q3 ends 5 January 2027; submission due 7 February 2027; reports 6 April-5 January 2027. - Q4 ends 5 April 2027; submission due 7 May 2027; reports full year 6 April 2026-5 April 2027. The cumulative reporting model (introduced via Autumn Statement 2023) means each submission supersedes the previous one. If you discover an error in your Q1 figures after submitting, you typically don't file a Q1 amendment — instead the correction flows through automatically when you submit Q2 (because Q2 contains corrected year-to-date totals). Only the final Q4 → Final Declaration step locks in the year. What goes in each quarterly update: For a sole trade: totals by category — turnover, materials/cost of sales, employee costs, premises costs, repairs/maintenance, motor/travel, professional fees, depreciation/capital, other. The categories follow the standard accounts-format categories used in current SA103. For a property business: totals by category — gross rents, repairs/maintenance, mortgage interest (subject to s.272A restriction calculated at Final Declaration not in quarterly), insurance, agent fees, other. The categories follow standard SA105 lines. What is NOT in quarterly updates: tax computations, reliefs claimed, capital allowances claimed, mortgage-interest restriction calculation, loss carry-forward decisions, sideways loss relief claims. All of these are reconciled at FINAL DECLARATION — quarterly updates are a snapshot of business activity, not a tax computation. Calendar quarter election: by default, MTD quarters run on tax-year boundaries (6th of the month). Optional calendar quarter election aligns quarters with month-end (31 March / 30 June / 30 September / 31 December) — useful if your bank statements + supplier invoices follow calendar months. Election is annual; once made it applies for the full tax year. Property income — quarterly granularity: you submit by property business (UK property = one stream; foreign property = separate stream). Individual property-by-property breakdown is NOT required for HMRC quarterly submission (but is sensible to maintain in your software for record-keeping + cost-base tracking). Foreign income within MTD: foreign property income aggregated in foreign property stream; SA106 reporting equivalents flow through Final Declaration.

    How it works

    The four standard quarters

    Q1: 6 April-5 July; due 7 August. Q2: 6 July-5 October; due 7 November. Q3: 6 October-5 January; due 7 February. Q4: 6 January-5 April; due 7 May. One submission per qualifying income source per quarter — so a taxpayer with one sole trade + one property business = 8 quarterly submissions per year.

    Cumulative reporting (Autumn Statement 2023 model)

    Each quarterly update reports YEAR-TO-DATE figures rather than just-that-quarter figures. Q1 = April-July figures only. Q2 = April-October figures (so includes corrected Q1 if errors found). Q3 = April-January. Q4 = full year. Corrections flow through naturally — most amendment scenarios subsumed by the next quarter without separate filings. Only Final Declaration locks the year.

    Content — totals by category

    Categories track the existing SA103 + SA105 lines. Sole trade: turnover, cost of sales, employee costs, premises costs, repairs/maintenance, motor/travel, admin/professional fees, depreciation/capital, other. Property: gross rents, repairs/maintenance, mortgage interest (raw figure; restriction calc at Final Declaration), insurance, agent fees, other. Software handles category mapping automatically from bank-feed transactions you have tagged.

    Calendar quarter election

    Optional alternative quarter dates: 31 March / 30 June / 30 September / 31 December. Election made annually; applies for full tax year. Useful where bank statements + supplier invoices align with calendar months (rather than tax-year months). Most landlords + many sole traders find calendar quarters easier to reconcile.

    Cash basis vs accruals basis

    Cash basis (ITTOIA 2005 ss.25-31): default for sole traders below threshold; income recognised when received, expenses when paid. Accruals basis: recognise when earned/incurred. Election is annual via the SA return (continues to apply within MTD). Most simple sole traders + landlords use cash basis — simpler quarterly reporting. Election affects category totals reported quarterly.

    What is NOT in quarterly updates

    Reliefs claimed (capital allowances, mortgage interest restriction calculation, sideways loss relief, FYA, AIA elections) — all at Final Declaration. Personal allowance utilisation — Final Declaration. Pension contributions — Final Declaration. Gift Aid — Final Declaration. Marriage Allowance election — Final Declaration. Trading Allowance election — Final Declaration. The quarterly update is RAW BUSINESS DATA; reconciliation into tax position is the Final Declaration step.

    Who this applies to + key conditions

    Statute + manual references

    Primary: SI 2021/1076 — Income Tax (Digital Requirements) Regulations 2021 — quarterly update content + cadence (regs 8-10).

    Related: Finance (No.2) Act 2017 ss.60-62 — MTD framework; Autumn Statement 2023 — cumulative reporting model announcement; ITTOIA 2005 ss.25-31 — cash basis election rules; ITTOIA 2005 ss.783A-783AR — Trading Allowance; ITA 2007 s.272A — mortgage interest restriction (reconciled at Final Declaration, not quarterly)

    HMRC manual: MTD ITSA collection — gov.uk/government/collections/making-tax-digital-for-income-tax

    Common mistakes + traps

    Worked example

    Marcus, Phase 1-caught sole-trader carpenter (cash basis) for first MTD year 2026/27

    Marcus is mandated from 6 April 2026. He uses Xero with NatWest business bank-feed + tags transactions monthly. He needs to understand his Q1 2026/27 submission obligation + what figures go in.

    1. Step 1 — Q1 period: 6 April-5 July 2026. Submission due 7 August 2026.
    2. Step 2 — Q1 figures: turnover £14,000 (cash received in period); materials £3,200; motor/travel £620 (AMAP 1,550 miles at 45p); other expenses £180. Net profit Q1 alone = £10,000.
    3. Step 3 — Q1 submission content (year-to-date = just Q1 because first quarter): turnover £14,000, cost of sales £3,200, motor £620, other £180. Submit via Xero MTD module — one click + OAuth confirmation.
    4. Step 4 — Q2 period: 6 July-5 October 2026. Due 7 November 2026. Cumulative figures: turnover £30,000 (Q1+Q2), materials £6,800, motor £1,310, other £400.
    5. Step 5 — Marcus discovers in September he had double-counted a £450 invoice in Q1. Correction flows naturally — Q2 cumulative figure already correct because the duplicate was removed when discovered. No separate Q1 amendment needed.
    6. Step 6 — Q3 (due 7 Feb 2027) + Q4 (due 7 May 2027) follow same pattern — each cumulative year-to-date.
    7. Step 7 — Final Declaration by 31 January 2028: reconciles cumulative Q4 totals + adds reliefs (AIA on van purchase, pension contributions, Marriage Allowance), produces final tax computation, balancing payment + 2027/28 first POA due 31 January 2028.
    8. Step 8 — Anti-charlatan note: 'Quarterly review service £300/quarter (~£1,200/year)' is not warranted for this fact pattern. Marcus's bank-feed + tagging workflow produces quarterly updates with minutes of effort. If complexity rises he can engage his accountant at standard hourly rates for occasional review.

    Outcome: Four quarterly updates submitted on schedule via Xero; cumulative reporting absorbs minor corrections without separate amendments; Final Declaration reconciles into normal SA tax position. No specialist retainer warranted.

    How this connects to the rest of the framework

    Software requirements →

    Software automates quarterly update generation from bank-feed data + tagged transactions.

    EOPS + Final Declaration →

    Q4 quarterly update flows into Final Declaration; reconciliation + reliefs at Final Declaration step.

    Penalty regime →

    Late submission triggers points-based penalty under Schedule 24 FA 2021 — 4 points for quarterly returns.

    Transition mechanics →

    First quarterly update for Phase 1 mandated taxpayers: Q1 2026/27 due 7 August 2026.

    /self-assessment →

    Non-MTD income continues to be reported via Final Declaration alongside MTD quarterly data.

    /reliefs/cash-basis →

    Cash vs accruals basis election affects what figures are reported quarterly.

    Frequently asked questions

    What happens if I miss the Self Assessment deadline?+
    The Self Assessment deadline is 31 January (online filing) for the previous tax year. Miss it and HMRC apply an automatic £100 penalty. Beyond that: £10 per day from 3 months late (capped at £900), 5% of tax due at 6 months late, and another 5% at 12 months late, under Schedule 55 of the Taxes Management Act 1970. If you have a genuine reason (serious illness, bereavement, technical issue with HMRC's systems) you can appeal with evidence; HMRC accepts reasonable excuse appeals in most genuine cases.
    Do I need an accountant or can I file Self Assessment myself?+
    Legally you can file Self Assessment yourself via gov.uk for free, most simple sole-trader returns (single income source, basic expenses) are realistic to self-file. An accountant adds real value when: your trading profit is above £40,000 (extraction-strategy decisions matter), you have multiple income streams (PAYE + self-employment + property + dividends), you've crossed the £90,000 VAT threshold, you're considering incorporation, or you have an HMRC enquiry. Expect to pay £400-£1,500/year for a typical sole-trader accountant; the cost is itself a deductible expense.
    How do payments on account work?+
    When your Self Assessment tax bill exceeds £1,000 for the first time, HMRC requires payments on account toward NEXT year's tax. Half the current bill is due 31 January (alongside the current bill); the other half is due 31 July. So your first January after crossing the threshold can hit with a double-bill: last year's balance + first payment on account. Adjust via Form SA303 if you expect next year's income to drop substantially. Payments on account don't apply if more than 80% of your tax is collected via PAYE.
    Do I need to submit transaction-by-transaction data to HMRC?+
    No — quarterly updates report TOTALS BY CATEGORY only. Transaction-level digital records must be maintained in your software (for record-keeping + potential HMRC enquiry inspection), but the submission to HMRC is summary totals.
    What if my business has no income or activity in a quarter?+
    You still submit a NIL return for that quarter (or for that income source if a multi-stream taxpayer). Software handles this — confirm zero figures + submit.
    Can I file early?+
    Yes — you can submit a quarterly update at any time after the quarter ends + before the deadline. Many taxpayers + agents file shortly after quarter-end to clear the desk.
    What happens if I am late?+
    Points-based late submission penalty under Schedule 24 FA 2021 (see Penalty regime page). 4 points for quarterly returns triggers a £200 fixed penalty for each subsequent late filing. 2026/27 transitional concession applies — check HMRC published guidance.

    Free + regulated-body resources

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