Compliance with UK VAT rules depends on the timely and accurate submission of your transaction data. Missing deadlines or submitting incorrect data can result in penalties, additional fees, interest and complications with HMRC.

This article explains the key deadlines, official HMRC deadlines, why they matter, and what happens if you do not comply.

✅ Key Data Deadlines in the UK

All transaction data must be uploaded to your hellotax software account — never sent by email — to ensure accurate VAT filings.

Quarterly VAT Filing

Quarterly VAT returns are common in the UK.

• Data upload to hellotax: By the 4th of the month following the end of the VAT period
  Example: VAT period ending 31 March → upload by 4 April
• Official HMRC filing deadline: Generally 1 calendar month and 7 days after the end of the VAT accounting period
• VAT payment deadline: Generally the same as the filing deadline

For example:

VAT period ending 31 March → VAT return and payment generally due by 7 May.

Monthly VAT Filing

Where a business has monthly VAT periods:

• Data upload to hellotax: By the 4th of the following month
• Official HMRC filing deadline: Generally 1 calendar month and 7 days after the end of the VAT accounting period
• VAT payment deadline: Generally the same as the filing deadline

⚠️ Individual businesses may have different VAT accounting arrangements. Always follow the VAT period and deadlines applicable to your registration.

⚠️ hellotax requires data by the 4th of the month to ensure VAT returns can be prepared and submitted on time in line with HMRC deadlines.

⚠️ Why Meeting Deadlines Matters

Submitting your data on time ensures:

• Accurate VAT filings — all sales, refunds, returns and other relevant transactions are included
• Efficient automated processing — the hellotax system relies on uploaded data
• VAT returns can be prepared before the HMRC deadline
• Audit-ready records
• Reduced risk of penalties and late-payment interest

❌ Consequences of Late or Missing Data

Late uploads (after the 4th)

• Automatic filing may no longer be possible
• Manual processing is required by hellotax
• A €119 fee applies for each affected filing

Missing data (not uploaded at all)

If the required data is not provided, hellotax may be unable to prepare and submit your VAT return correctly and on time.

HMRC operates separate systems for late submission and late payment.

Late VAT returns can result in penalty points. Once the applicable points threshold is reached, a financial penalty may be imposed. The threshold depends on how frequently the business submits VAT returns.

Late VAT payments can result in late-payment penalties, with the amount depending on how long the VAT remains outstanding. Late-payment interest may also apply from the date the payment becomes overdue.

Repeated non-compliance can therefore result in increasing costs and additional interaction with HMRC.

💡 Best Practices to Stay Compliant

• Upload early: Ideally between the 1st–3rd of the month
• Use integrations: Connect supported marketplaces and webshops where available
• Do not send data by email: Always upload through your hellotax account
• Check completeness: Include refunds, returns, manual orders and stock movements where applicable
• Review alerts: Resolve missing or incorrect information promptly
• Forward HMRC letters immediately: Send any communication from HMRC to your Account Manager

🤝 How hellotax Supports You

hellotax provides:

• Automated checks for missing or incomplete data
• Alerts for integration or upload issues
• Clear visibility of deadlines in your dashboard
• Manual support if deadlines are missed, with applicable fees
• Storage of filings and relevant confirmations
• Support from your hellotax Account Manager

📌 Summary of Deadlines and Responsibilities

Meeting these deadlines is your responsibility, but hellotax provides the tools, support and guidance to help you maintain your UK VAT compliance.