The emails that generate the most engagement from an accounting firm's list are almost always deadline-related. Clients and prospects pay attention when there is a specific date and a specific action they need to take. The templates below cover the major UK tax deadlines across the year. Copy them directly, adapt the firm name and contact details, and schedule them in your email tool.
Each template follows the same structure: a direct subject line, a short body (under 200 words), a clear action, and a closing that invites a reply. Brevity is intentional — deadline emails are not newsletters.
31 January — self-assessment deadline (primary send, four weeks before)
Subject: 31 January is four weeks away — here is what we need from you
Body:
The 31 January self-assessment deadline is now four weeks away. If you have not yet sent us your records for the 2024/25 tax year, now is the time to act.
What we need from you:
- All employment income (P60s and P45s if applicable)
- Self-employment income and expenses
- Rental income (if applicable)
- Investment income: dividends, interest, capital gains
- Any other income or allowable deductions
Please send your information by [DATE] to give us enough time to prepare and file your return before the deadline.
Late filing carries an automatic £100 penalty, plus additional charges if the return is more than three months late.
Reply to this email or contact us at [EMAIL/PHONE] to get started.
[Firm name]
31 January — self-assessment deadline (final reminder, one week before)
Subject: One week until 31 January — have you sent your records?
Body:
We have one week until the 31 January self-assessment deadline.
If you have already sent us your records, thank you — we will be in touch shortly.
If you have not yet sent your information, please do so today. We need to receive your records by [DATE] to guarantee filing before the deadline.
After that date, we cannot guarantee submission in time and you may face a £100 automatic late filing penalty.
Reply to this email with your records or call us on [PHONE] to discuss.
[Firm name]
5 April — tax year-end (three weeks before)
Subject: The tax year ends on 5 April — three things to do this week
Body:
The current tax year closes on 5 April. There are three actions worth taking before then:
1. Use your ISA allowance: up to £20,000 can be sheltered from tax in a stocks and shares or cash ISA. Unused allowance cannot be carried forward.
2. Use your pension annual allowance: contributions made before 5 April qualify for this year's relief.
3. Review your dividend position: if you are a director taking dividends, your tax band position for the year is now clear. Consider whether a final dividend before 5 April makes sense.
If you want to discuss any of these, book a call with us at [LINK] or reply to this email.
[Firm name]
6 July — P11D deadline
Subject: P11D deadline: 6 July — what you need to submit
Body:
If you provided any expenses or benefits to employees or directors in the 2024/25 tax year, you need to submit a P11D to HMRC by 6 July.
Benefits that typically require a P11D include:
- Company car (and car fuel)
- Private medical insurance
- Interest-free or low-interest loans above £10,000
- Non-business travel and entertainment
You also need to submit a P11D(b) to declare the total Class 1A NI due on those benefits, with payment due by 19 July (22 July if paying electronically).
Please let us know as soon as possible if you have provided any benefits that need reporting. Reply to this email or call us on [PHONE].
[Firm name]
31 July — second payment on account
Subject: 31 July payment on account — what you owe and how to pay
Body:
The second payment on account for the 2024/25 tax year is due on 31 July.
Your payment should be [AMOUNT — personalise or remove this line] based on last year's tax bill. If your income has changed significantly since last year, you may be able to reduce this payment — contact us before the deadline to discuss.
How to pay: online at HMRC's website, by bank transfer using your UTR as the reference, or by debit card through your HMRC online account.
If you cannot afford to pay, contact HMRC before the deadline to arrange a time to pay agreement. This avoids late payment interest accumulating.
Any questions — reply to this email.
[Firm name]
31 October — paper self-assessment deadline
Subject: 31 October paper return deadline — are you filing online?
Body:
If you intend to submit your 2024/25 self-assessment tax return by paper, the deadline is 31 October.
If you are filing online, you have until 31 January — but starting the process now rather than in January means more time for questions, corrections, and planning if your tax bill is higher than expected.
We file all returns electronically on your behalf. To ensure we can file before the January deadline, we need your records by [DATE].
Reply to this email or book a records call at [LINK].
[Firm name]
Budget day — same-day or next-day send
Subject: Budget day — here is what matters for your business
Body:
The Chancellor delivered the Budget today. Here are the changes most relevant to our clients:
[Insert 3–5 bullet points of key changes immediately after Budget — salary, dividend tax, CGT, NI, corporation tax rates, any sector-specific announcements]
We will send a fuller analysis this week. In the meantime, if any of these changes prompt questions about your own tax position, reply to this email or book a call at [LINK].
[Firm name]
How to use these templates
Schedule deadline emails in your email tool in advance — do not draft them the week they are due. The most reliable approach is to schedule the full year's deadline emails at the start of the tax year in April, updating the dates and any personalisation fields before scheduling.
For segmented lists, adapt each template to the relevant audience. The P11D email applies only to employer clients; the self-assessment email applies only to those who file a return. Sending non-applicable deadline emails to the wrong segment erodes trust.
Key takeaways
- Deadline emails generate the highest engagement of any accounting firm email marketing content — clients pay attention when there is a date and an action.
- Keep deadline emails short (under 200 words) — one action, one deadline, one reply prompt.
- Schedule the full year's deadline emails in April so they are sent consistently regardless of workload.
- Segment deadline emails by applicability: P11D emails to employer clients, self-assessment emails to SA filers, payment on account emails to the relevant subset.
- Add a personalisation token for firm name and contact details before scheduling.
Frequently asked questions
Should deadline reminder emails include an unsubscribe link?
All marketing emails must include an unsubscribe option under PECR. If you are sending to a marketing list (clients and prospects who opted in), yes. Operational service communications (e.g. a reminder to an existing client about a deadline that specifically affects their file) may fall outside the marketing definition, but including an unsubscribe option is best practice regardless.
How far in advance should we schedule these emails?
Schedule them at the start of the tax year in April and update any year-specific references (tax year, payment amounts, dates) before confirming. The goal is to have all annual deadline emails scheduled by the end of April so they require no further action.
Can we personalise these with the client's specific tax amount owed?
Some email tools support dynamic content fields — inserting a specific value from a custom field for each contact. This requires your list data to include that field. For practices using a CRM or practice management tool, an export of client-specific data can populate personalisation fields. This is advanced functionality; the base templates work effectively without it.
What tone should deadline emails use?
Direct and factual, with a clear call to action. Not panicked or threatening. The goal is to prompt action, not anxiety. A matter-of-fact tone ("the deadline is four weeks away — here is what we need") is more effective than urgency language ("don't miss this critical deadline!").
Should we send the same deadline reminder to clients and prospects on our list?
Self-assessment and payment reminders are most relevant to existing clients. Prospects who are on your marketing list but not yet clients should receive a softer version — "if you need to file a self-assessment return and don't have an accountant yet, here is what to expect" — which doubles as a reason to get in touch.
See our guide on automating client reminders to schedule these templates, or browse the email marketing hub for more guides.