Dry-Run Your MTD Transition: Pilot Quarterly Updates Before Full Compliance

Running a ‘Dry Run’ Transition to MTD: How to Pilot Quarterly Updates Before Full Compliance

Making Tax Digital (MTD) for Income Tax (ITSA) is being introduced in stages from April 2026. If your business or rental income will fall within the staged thresholds, a controlled pilot — a ‘dry run’ — is one of the best ways to build confidence, test systems and avoid disruption when quarterly digital reporting becomes mandatory.

Who this guide is for

This article is written for self-employed people and landlords preparing for the 2026–2028 rollout. It explains why a dry run is useful, how to plan one, what to test, and practical steps for making quarterly updates part of your routine before the legal deadline.

Quick timeline to keep in mind

• April 2026: taxpayers with annual income over £50,000 join MTD ITSA
• April 2027: taxpayers with annual income over £30,000 join
• April 2028: taxpayers with annual income over £20,000 join

Why run a dry run?

A dry run is a simulated, non-legally-binding round of quarterly updates that mirrors the real MTD process. It reduces risk and builds routine. The main benefits are practical:

• Identify gaps in digital records and correct them before compliance starts.
• Test accounting software and bank feeds to ensure automatic posting and reconciliation work as expected.
• Get comfortable with the HMRC APIs or the agent interface if you use an accountant.
• Train staff or household record-keepers on a low-stakes timetable.
• Estimate ongoing costs so you can budget for software subscriptions and any bookkeeping support.

What a dry run is not

It is not a legal submission to HMRC. You are not changing the law or your tax liabilities by doing a pilot. However, a good dry run should faithfully replicate the cadence and workflow you will use once MTD is mandatory.

Plan your pilot: scope and objectives

Begin by setting clear, practical objectives. Good pilots usually last 3–6 months and test the following areas.

• Record completeness: Are sales, expenses and bank transactions captured digitally and tagged to the correct categories?
• Software configuration: Can you produce the quarterly figures required by HMRC from your chosen software?
• Reconciliation: Is your bank feed reliable and do reconciliations balance without manual workaround?
• Timing and workflow: Can you produce accurate quarterly updates within an internal deadline (e.g. 7 days after quarter end)?
• Finalisation and notes: Can you prepare year-end reconciliations and make the End of Period Statement (EOPS) when needed?

Choose the right approach

There are two main ways to run a pilot:

• Solo pilot: You run the pilot yourself using your software and practices. This suits sole traders and landlords who manage records personally.
• Accountant-led pilot: Your accountant or agent runs the pilot and provides feedback. This is useful if you plan to retain professional support under MTD.

Choosing software: what to test

Under MTD ITSA you must keep digital records and use MTD-compatible software to send quarterly updates. For a dry run, you should test:

• Bank feed setup and automatic categorisation
• Sales and purchase recording — including partially paid invoices or receipts
• Handling of personal drawings and owner’s contributions
• VAT (if you’re VAT registered) integration with the same software, if possible
• Exporting reports that show profit/loss, and exports suitable for year-end reconciliations

Sample 6-month dry run plan

Here is a step-by-step pilot timetable you can adapt.

• Month 0 — Preparation
  • Pick software and set up a trial account.
  • Gather six months of recent digital records to use in back-testing.
  • Agree internal deadlines and responsibilities (who records, who reviews).
• Month 1 — Onboarding & Baseline
  • Import opening balances and current year transactions.
  • Run an initial reconciliation and resolve obvious discrepancies.
• Months 2–4 — Quarterly Cycle Simulation
  • For each ‘quarter’ produce the HMRC-style quarterly update figures (income, allowable expenses, adjustments).
  • Test timings: prepare figures, reconcile bank, and apply any manual adjustments.
  • Log issues and action points after each simulated quarter.
• Month 5 — Year-end Procedures
  • Run your year-end reconciliation. Practice the End of Period Statement (EOPS) procedure and the final adjustments you would make for tax.
  • Review the accuracy of quarterly aggregates versus your year-end position.
• Month 6 — Review and Next Steps
  • Summarise lessons learned, cost estimates and any process changes.
  • Decide whether to continue solo or retain an accountant for compliance.

Record-keeping practicalities

MTD requires digital records of business income and expenses. For self-employed people and landlords this commonly includes:

• Sales receipts, invoices and rent statements (digital copies)
• Bank statements and bank feed transactions
• Receipts for expenses that are allowable for tax
• Records of capital allowances and VAT (if applicable)

During your pilot, tidy and label historic digital files so finding documents is straightforward. The time invested here will pay dividends — HMRC expects digital records that are clear and retrievable.

Reconciliation: the backbone of accurate quarterly reporting

Reconciliation is where many small businesses find issues. Your dry run should check that:

• Bank feed matches recorded sales and expense transactions.
• Invoices are marked as paid when payments appear in the bank feed.
• Personal withdrawals are correctly recorded as drawings, not expenses.

If reconciliations don’t line up, identify whether the gap is timing, missing transactions, or incorrect categorisation, then fix the root cause.

Handling tricky items during the pilot

• Part-exchanged or barter transactions: Record their realistic taxable value and supporting evidence.
• Mixed-use expenses: Split costs appropriately (e.g. a phone used partly for business and partly privately).
• Rental deposits, security bonds and refunds: Ensure you have a clear policy and record movement as required.

Training and responsibilities

Decide who will make the quarterly entries and who will review them. For sole traders this may be you, but be realistic about time. For landlords, consider whether a managing agent or accountant will assist with the pilot.

Common mistakes to watch for

• Relying on spreadsheets alone without a linked software solution — spreadsheets can be used but must be part of an MTD-compatible flow.
• Poorly categorised transactions that distort taxable profit.
• Delay in reconciling bank transactions leading to last-minute corrections.
• Not testing the process for correcting an earlier quarter if an error is found — you should practice amending figures.

Dealing with mistakes: practice amending submissions

As part of your dry run, simulate discovering and correcting an error in an earlier quarter. This will help you learn how to:

• Adjust the subsequent quarterly update to reflect the correction
• Keep an audit trail of who made the change and why
• Prepare any supporting notes you would keep for HMRC inspection

Cost considerations

Running a pilot has a modest cost: software subscriptions, time to tidy records, and possibly an accountant’s fee. Use the pilot to estimate these ongoing costs so you can price time or fees correctly. For landlords, include time to reconcile rent statements and property-related expenses. For sole traders, include travel and subsistence reconciliation time if relevant.

When to involve an accountant

If your affairs are straightforward you may feel comfortable running the pilot yourself. However, involve an accountant if:

• Your bookkeeping is behind
• You have complex adjustments like capital allowances or property-based tax reliefs
• You want reassurance that your chosen software will produce HMRC-ready figures

Assessing success of the pilot

After the pilot, score performance by these measures:

• Were quarterly figures produced accurately and on time?
• Did reconciliation match bank balances without persistent manual fixes?
• Was the software reliable and easy to use?
• Do you have a clear, repeatable process for future quarters?

Next steps after a successful dry run

Move from pilot to production by agreeing internal deadlines, formalising a checklist for each quarter, and budgeting for software and any recurring bookkeeping support. If your income is near a threshold, use your pilot results to prepare for the exact date you will become subject to MTD.

Final reassurance and what to watch out for

MTD ITSA is a significant change but it is manageable with preparation. A dry run removes much of the uncertainty and gives you clear evidence of what to improve. Be firm about deadlines and training — complacency causes most compliance failures, not the technology itself.

Frequently asked practical questions

Do I have to pay tax quarterly under MTD? No. MTD changes how you report — quarterly updates — but payment dates remain as under Self Assessment. You will still pay the usual interim payments (Payments on Account) and balancing payments.

Can I use spreadsheets? Spreadsheets can form part of a compliant process if they are used as part of a digital, MTD-compatible workflow. Many small businesses combine spreadsheets with MTD-compatible software; the pilot will show whether that approach is practical for you.

Need help running a dry run?

If you would like support, Tax Digital specialises in MTD dry runs and full transitions. We help you pick software, set up bank feeds and run mock quarterly cycles so you can be confident when the legal change arrives.

Plan early, test thoroughly, and use the dry run to make compliance a calm, routine part of your business. That way the staged rollout in 2026–2028 becomes a manageable change rather than a stressful scramble.