How to create a system to track key tax deadlines for clients

The secret to a stress-free tax practice is never being surprised by a deadline. To keep your clients compliant and your reputation intact, you must establish a central "source of truth"—either via practice management software or a dedicated spreadsheet—that logs every statutory filing and payment date for every client you serve.

Choose your tracking tool

Before you start logging dates, decide which tool fits your current business stage. While dedicated software is more powerful, a well-organised spreadsheet is a perfectly valid starting point for a solo practitioner.

• Practice Management Software: Many HMRC-recognised packages include built-in "dashboards" that automatically calculate deadlines based on a client’s year-end. These often come with automated email reminders.
• Spreadsheets (Excel/Google Sheets): Low cost and highly customisable. Use conditional formatting (e.g., turning a cell red when a date is less than 30 days away) to make the sheet more visual.

Key UK tax deadlines to monitor

Every client is different, so your system needs to account for various tax regimes. Use the table below as a guide for the core deadlines you should be tracking:

Tax TypeFiling DeadlinePayment DeadlineSelf Assessment31 January (online)31 January (& 31 July for payments on account)Corporation Tax12 months after end of accounting period9 months and 1 day after end of accounting periodVAT Returns1 month and 7 days after period end1 month and 7 days after period endPAYE/National Insurance22nd of the following month (if paying electronically)22nd of the following month

How to build your tracking system

1. Audit your client list: Collate every client and identify exactly which services you are providing for them.
2. Identify "Year Ends": For Limited Companies, log their specific Accounting Reference Date (ARD). For individuals, the tax year always ends on 5 April.
3. Input statutory deadlines: Based on their year-end, calculate and log the final dates for filing and payment.
4. Set "Internal" milestones: Don't just track the final deadline. Create "soft" deadlines for requesting records from the client (e.g., 2 months after their year-end) and a "drafting" deadline for your own work.
5. Add a status column: Include a dropdown menu for each task, such as "Records Requested," "In Progress," "With Client for Approval," or "Filed."

Pro Tip: Always aim to file at least one month before the HMRC deadline. This "buffer" accounts for last-minute missing information or technical issues with HMRC’s servers, ensuring you never have to explain a late-filing penalty to a frustrated client.

Maintenance and review

A tracking system is only useful if it is accurate. Set a recurring task in your calendar to review your master deadline list on the first Monday of every month. Check for new clients that need adding and ensure that any changes to a client's status (such as de-registering for VAT) are reflected immediately in your tracker.