Getting an alert or letter from HMRC saying your Making Tax Digital (MTD) quarterly update has been flagged can instantly cause your stomach to drop. You did your digital submission, you used your software, and you thought everything was squared away. So why is HMRC knocking?
First off: take a deep breath. A flagged quarterly update or compliance check is not an accusation of fraud or a guaranteed tax penalty. Under MTD for Income Tax (MTD ITSA), HMRC’s automated systems and risk models scan millions of digital submissions for anomalies, sudden spikes, or inconsistencies. Sometimes, it’s just a mismatch that needs a quick explanation.
If your update has landed on HMRC’s radar, here is your practical, jargon-free survival guide on what happens next, how to handle it, and how we can step in to remove the stress entirely.
What HMRC Actually Sees in Your MTD Quarterly Update
To understand why a flag happens, it helps to remember what a quarterly update actually is. Under MTD, a quarterly update is not a full tax return. It is a summary of your business income and expenses for the quarter, submitted every three months for each trade or property business you operate.
HMRC receives totals by category (such as total sales, motor expenses, or advertising costs), rather than every individual receipt or invoice. Because they only see summary figures, their automated risk systems look out for things like:
- Sharp, unexplained jumps or drops in turnover compared to previous quarters or years.
- Expense categories that look unusually high or out of proportion for your type of trade.
- Internal inconsistencies, such as negative numbers or miscategorised capital items.
If something trips their system, an automated flag goes up, and a compliance officer may open a formal check into that quarter's figures.
Immediate Steps: What to Do When HMRC Comes Knocking
If you receive a compliance check notice or an enquiry letter regarding a quarterly update, acting promptly and calmly is key. Here is your step-by-step game plan:
- Don't ignore it: Ignoring an HMRC enquiry will never make it go away. In fact, missed deadlines or silence will only escalate the situation and invite unnecessary penalties.
- Read the letter carefully: Identify precisely which quarter, which trade, and which figures HMRC is querying. Note any deadlines given for responses.
- Check your software submission receipt: Look back at the digital confirmation generated by your MTD software when you submitted that quarter. Confirm the exact figures that were sent over.
- Speak to your accountant immediately: This is where having professional support pays for itself. If you let us handle it, we step in to communicate directly with HMRC, saving you from awkward phone calls and technical jargon.
Reconstructing and Evidencing Your Quarter (The Survival Approach)
If HMRC asks to see the underlying records behind your flagged update, your goal is to demonstrate that every summary figure is backed by solid, reconciled digital records.
Here is how you and your advisor can build an airtight defence:
- Gather source documents: Pull together your bank statements, business credit card statements, invoices, and receipts for the exact dates of that quarter (whether you use standard tax year quarters like 6 April to 5 July or calendar quarters).
- Reconcile your bank: Match every transaction in your business bank account to your digital records. Account for any personal drawings, transfers, or cash expenses.
- Review categorisation: Make sure expenses sit in the correct HMRC-recognised categories. A common trigger is putting large, unusual costs into generic "miscellaneous" or "other" buckets without explanation.
- Prepare a simple reconciliation note: Create a clear, factual explanation showing how you moved from raw bank data to the submitted software totals. If motor expenses spiked because you had to replace a van engine, spell that out plainly so HMRC understands the context immediately.
How Makes Sense Accountants Takes Control of the Enquiry
Dealing with HMRC compliance checks can consume hours of your valuable time and drain your mental energy. You didn't start your business to spend your evenings arguing with tax officials over expense categories.
When you partner with Makes Sense Accountants, we remove the burden completely:
- Direct representation: We speak to HMRC on your behalf, translating their formal queries into plain English and handling all correspondence.
- Software & record review: We audit your digital records, bank reconciliations, and MTD submissions to ensure everything is watertight before any data is sent back to HMRC.
- Proactive advice: If an error or misunderstanding caused the flag, we correct it swiftly using MTD's resubmission rules and negotiate with HMRC to minimise or eliminate any potential penalties.
Preventing Future Flags: Best Habits for MTD Quarters
The best way to survive an HMRC enquiry is to make sure your next quarterly update doesn't trigger one in the first place. Build these healthy habits into your routine:
- Keep records updated weekly: Don't wait until the deadline on the 7th of the month to throw your receipts together. Connect your bank to your MTD software and categorise transactions as they happen.
- Review before you submit: Always look over your quarterly summary in your software before hitting send. Does your income make sense? Are expenses steady?
- Save your digital receipts: Keep your submission confirmations and digital audit trails archived safely.
Getting flagged by HMRC is never fun, but with clear records, calm communication, and expert guidance, it is entirely manageable.
If your quarterly update has been flagged, or if you want to make sure your MTD setup is foolproof, we are here to help. Get in touch with our team today through our contact form and let us handle the figures while you focus on running your business.