Making Tax Digital for Income Tax: the founder's countdown

Two large groups are first in the firing line: unincorporated sole traders and individual landlords with £50,000 or more in qualifying gross income in the 2024/25 tax year (to determine 2026/27 entry) or 2025/26 (for 2027/28). HMRC’s term is “qualifying income”: the sum of your self‑employment turnover and your gross property income before expenses. You’re out if you’re company‑only (PAYE/directors’ dividends through a limited company), a trust or an estate. Partnerships and LLPs are deferred: HMRC has said “not before” 2027 and now signals “later in the decade”; plan on 2028+ for general partnerships and later for LLPs. If you have multiple trades and/or UK and overseas property, you’re in scope when the combined qualifying income hits the threshold. If you’re below £30,000 in 2027, you remain outside mandation unless and until the Government confirms the expected £20,000 phase from April 2028. Non‑residents with UK property income are in scope on the UK rents if they cross the thresholds.

HMRC’s test for entry to MTD ITSA is gross, not net. For property, that means the receipts before mortgage interest, service charges, letting agent fees or repairs. Where a property is jointly owned, you only count your beneficial share of gross rents towards the threshold, ordinarily 50/50 for joint tenants or as per a valid declaration of trust/Form 17 for unequal shares between spouses or civil partners. Example: a couple with £42,000 gross annual rent split 50/50 each has £21,000 of qualifying property income apiece. Neither would be mandated in April 2026 or April 2027 on property alone; if one also has £30,000 self‑employment turnover, they cross £50,000 combined and join in 2026. Keep UK and overseas property businesses separate for reporting; each requires its own quarterly updates and year‑end End of Period Statement (EOPS). If you use rent‑to‑rent or have FHL history, see landlord specifics below.

The architecture is simple. First, keep digital records of each business transaction: date, amount, and category mapped to HMRC’s expense headings. Second, submit four quarterly updates per business (self‑employment; UK property; overseas property) via MTD‑compatible software. Third, after the year ends, make year‑end adjustments (capital allowances, accruals if you’ve elected), submit an EOPS for each business and a single Final Declaration consolidating everything (including bank interest, dividends and pension reliefs) by 31 January after the tax year. Quarterly updates don’t finalise tax or create a debt; they are snapshots. Payment timings for Income Tax and Class 4 NIC remain—31 January (balancing payment plus first payment on account) and 31 July (second payment on account). Basis Period Reform, already in force from 2024/25, means all unincorporated businesses report to 5 April (or 31 March treated as 5 April) regardless of your accounting date.

If you stick with HMRC’s default tax‑year quarters, the periods end on 5 July, 5 October, 5 January and 5 April, with updates due by 5 August, 5 November, 5 February and 5 May respectively. Many founders prefer month‑ends; HMRC allows a “calendar quarters election” so your updates cover the three months to 30 June, 30 September, 31 December and 31 March, with the same 5 August/5 November/5 February/5 May lodgement dates. You can make or revoke the election through your software or agent. Each trade/property business has its own four update obligations plus an EOPS. Miss an update and you accrue a point (see penalties below). The Final Declaration deadline is 31 January following the tax year, aligning with Self Assessment. Late payment interest runs from the normal due dates; updating quarterly does not pull cash forward unless you choose to pay as you go.

The Income Tax (Digital Requirements) Regulations 2021 (SI 2021/1076), as amended, set out the digital record‑keeping, digital links and update obligations for MTD ITSA. They sit alongside the Taxes Management Act 1970 for filing and enquiry powers and Finance Act 2021’s new late submission and late payment penalty framework, which HMRC is phasing across taxes. The regulations require functional compatible software—one product or a suite—that can create and submit the periodic updates and the EOPS/Final Declaration using HMRC’s APIs. Manual transposition is not permitted within the digital journey: data must flow via “digital links” (API, CSV import, bank feed) from source records to submission. Postings must be kept digitally with the date, amount and category. VAT‑registered traders already familiar with VAT Notice 700/22 (MTD for VAT) will recognise the digital‑links concept; HMRC’s ITSA regs mirror the approach, with no “soft landing” grace period trailed for 2026.

Don’t wait for perfection. HMRC publishes a rolling list of compatible products. As of 2026, mainstream choices for sole traders include FreeAgent (free if you bank with NatWest Group via Mettle, RBS or NatWest; otherwise typically £19–£33+VAT/month), Xero (Starter/Standard tiers typically £15–£33+VAT/month at full list), QuickBooks Online (Simple Start/Essentials commonly £14–£30+VAT/month at standard pricing), and Sage Accounting (Start/Standard around £14–£28+VAT/month). Mobile‑first options like Coconut target sole traders (circa £9–£20+VAT/month). Landlords should look at Hammock (from roughly £6.99–£15.99+VAT/month depending on units) for rent feeds and reconciliations. Bridging tools—123 Sheets being a long‑standing HMRC‑listed provider—allow spreadsheet‑kept digital records to file updates, provided digital links are maintained. For year‑end finalisation and adjustments, practice suites (TaxCalc, Iris, Sage) integrate agent workflows. Prices swing with frequent promos; budget £10–£35+VAT per month for most straightforward cases, free if you bank with the right provider.

Under the Digital Requirements Regulations, you may use more than one piece of software, but every flow of data between them must be digital. Acceptable links include bank feeds (Open Banking), API hand‑offs, CSV imports, and direct file uploads between products. Not acceptable: copy‑paste between spreadsheets, or re‑typing figures from a report into your filing product. Receipt photos are fine if the data (date, amount, supplier) is captured and posted into the ledger; the photo alone is not a digital record. If you insist on spreadsheets, set each trade/property up with a ledger tab capturing transaction‑level data and use bridging software to file. Keep an audit trail: HMRC can enquire and request to see how a total arose. For VAT‑registered founders already maintaining digital links to satisfy VAT Notice 700/22, extend the same plumbing to your ITSA categories; avoid duplicate reconciliations by using one ledger to drive both taxes.

HMRC doesn’t require you to post every coffee to a bespoke code, but you must map to the Self Assessment headings. At minimum, record for each transaction: date, amount, category, and (if VAT‑registered) VAT rate/amount. For self‑employment, mirror SA103F categories: cost of goods, wages, car/van, travel/subsistence, rent/rates/power, repairs, professional fees, advertising, bank charges, interest, and so on. For property (SA105), capture rents receivable, domestic items relief where applicable, repairs/maintenance, insurance, agent fees, utilities (if landlord‑paid), ground rent/service charges, and finance costs (mortgage interest—restricted for individuals, see below). Keep separate “businesses” in software for: each self‑employment trade; UK property; overseas property. If you run multiple properties, you don’t need per‑property ledgers for HMRC, but good practice is to tag by unit for yield/void analysis. Archive supporting documents digitally for at least 5 years after the 31 January deadline for the relevant tax year.

MTD ITSA adds cadence, not complexity, if you design for it. Software for a single trade and/or a small landlord portfolio typically sits at £10–£35+VAT per month. FreeAgent can be free with Mettle/NatWest/RBS business banking. Hammock’s landlord tiers scale with properties; many small portfolios land under £12+VAT/month. Your time cost is the swing factor: budget 30–60 minutes a week per business to categorize, reconcile and chase receipts. If you outsource quarterly bookkeeping and submissions, UK small‑firm accountants are quoting £35–£90+VAT per quarter per business for low‑volume clients, plus £150–£400+VAT for year‑end EOPS and Final Declaration, depending on complexity (capital allowances, overseas property, Class 4 NIC quirks). False economy is common: sporadic DIY followed by January panic generally costs more in clean‑up fees and—under the points regime—penalties.

Assume a sole trader designer with £65,000 turnover and £18,000 expenses on the cash basis, plus £12,000 gross UK rents with £6,000 allowable expenses and £5,400 mortgage interest (subject to basic rate credit). They cross the £50,000 threshold, so they join MTD ITSA from April 2026. Quarterly, they’ll push updates for trade and for UK property; software £23+VAT/month; an accountant charging £60+VAT per quarter per business for reviews (£480+VAT/year). Year end, EOPSs plus Final Declaration £300+VAT. Total direct compliance spend: about £1,056+VAT a year, versus maybe £650+VAT pre‑MTD if they only did annual accounts. But benefits: real‑time view of payments on account and Class 2/4 NIC, and lower risk of £200 penalties. Taxwise, nothing changes: profits are £47,000 from trade plus £6,000 property; mortgage interest gets a 20% tax reducer (£1,080) outside the property profit calc. Payments on account remain due by 31 January/31 July; quarterly updating doesn’t accelerate tax cash.

Late submission penalties are now points‑based. Each missed quarterly update, EOPS or Final Declaration earns a point for that obligation. For quarterly obligations, the threshold is four points; hit it and you get a £200 penalty. Every additional late submission while at threshold is another £200. Points expire after a period of compliance: 12 months for quarterly obligations once you’ve filed all outstanding returns. You can appeal a point or penalty for reasonable excuse, via your software or HMRC. Late payment penalties sit alongside: 2% of the outstanding tax at day 15, a further 2% at day 30, then daily penalties at 4% per annum thereafter until paid, plus late payment interest at the Bank of England base rate plus 2.5 percentage points. Don’t conflate quarterly updates with payments: paying early reduces interest; not paying triggers the new late payment regime regardless of how punctual your updates were.

From 6 April 2024, the cash basis became the default for unincorporated businesses with most previous restrictions swept away. You can elect out to accruals if it better reflects your trade (e.g., large year‑end work in progress or stock swings). Under cash accounting, you recognise income and expenses when money moves; capital allowances largely give way to simplified treatment, but separate rules still apply for cars. For MTD, cash basis smooths quarterly updates—less accruals juggling in‑year—but you still make year‑end adjustments (prepayments, private use disallowances, capital expenditure categorisations). If you’re VAT‑registered, your VAT accounting scheme choice (cash vs invoice) is separate. Make the accruals election in your software at the start of the tax year and be consistent. HMRC has indicated the EOPS will capture your basis choice; changing basis mid‑stream complicates comparatives and can distort payments on account.

Treat MTD ITSA as an operational project with a hard legal deadline. The build is light if you start now, painful if you wait. Prioritise one trade/property first, then copy the pattern. The goal: digital records flowing automatically, reconciled weekly, filed quarterly with minimal drama.

The founders who glide through MTD are the ones who schedule it. Do 20–30 minutes twice a week. Reconcile bank lines, attach receipts, post rent statements, and clear query lists. Lock closed months in software. Use bank‑rules for recurring spend but review exceptions. For landlords, match rent receivables against banked amounts and agent statements—don’t let tenant arrears or voids get lost in “miscellaneous income”. If you use spreadsheets and bridging, build validation checks: a control total that ties opening bank balance + cash in – cash out to closing bank balance every month, and a pivot that ties category totals to the update draft. Push quarterly updates at least a week before the 5th deadline, so you have time to fix rejects (common API errors are mis‑categorised lines and businesses set to the wrong basis). Year‑end, sit down with your accountant in May/June to plan capital allowances and payments on account—cheaper than firefighting in January.

If you work with an accountant, they need to be on HMRC’s Agent Services Account (ASA) and authorised for your MTD ITSA account. This is separate from existing Self Assessment agent codes. The agent will invite you to grant authorisation through your Government Gateway; you accept within 30 days. Once live, they can file quarterly updates, EOPS and the Final Declaration via their practice software. Clarify with your agent who is responsible for bookkeeping vs review vs filing vs year‑end adjustments; price accordingly. If you change agents, revoke ASA authorisation after the final filing and ensure your software licence ownership is clear (founder‑owned avoids lock‑in). For small teams, train one internal “books owner”; founder‑time is expensive and inconsistent. ICO/GDPR note: cloud software is a data processor for your customers’ and tenants’ personal data; ensure you have a privacy notice and a processor agreement (standard terms cover this) and restrict user access with MFA.

HMRC’s MTD ITSA pilot, reopened in a limited form, has quietly surfaced the failure modes. First, identity mismatch: clients signing up with an old or duplicate Government Gateway ID causes broken authorisations. Second, basis period confusion: post‑2024/25 everything is on a tax‑year basis; founders with 31 December year‑ends botch the transitional overlap relief and quarterly mapping. Third, joint property: couples filing the full rent in both records instead of each reporting their share. Fourth, digital links: spreadsheets with copy‑paste between tabs or a manual keystroke into the bridging tool breach the rules. Fifth, software settings: many set cash basis in‑year and try to file accruals at EOPS without a consistent basis choice. Sixth, treating quarterly updates as tax bills, then panicking when estimates swing—updates are rough, year‑end is what sets tax. HMRC’s API rejects silent errors; build a pre‑submission checklist and run it every quarter.

From April 2025, the Furnished Holiday Lettings regime is abolished, removing the special treatment that previously allowed capital allowances and full loan interest deduction. By 2026 you’re under the standard property rules: mortgage interest does not reduce rental profits but gives a basic‑rate (20%) tax reducer (Income Tax Act 2007 s59A; FA 2017 changes). MTD doesn’t change the section 24 restriction, but it makes mis‑posting more visible; keep “finance costs” separate from property expenses. If you have mixed portfolios, keep UK property and overseas property segregated in software; foreign tax credit relief is a year‑end adjustment captured in EOPS/Final Declaration. For jointly‑owned property, reflect the beneficial split correctly from day one; for spouses/civil partners wanting unequal splits, file Form 17 with evidence to HMRC and maintain the same split in your records. Hammock and similar tools help track rent arrears, safety certificate dates (HSE relevance for gas), and yields—use them to run the business, not just to file.