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Checklist · Client
Self Assessment Tax Return Checklist for Accountants
A step-by-step approach to tax return preparation.
Built by a practising Chartered Accountant · Unlimited users · 60-day free trial · Last updated 23 September 2026
Quick answer
The annual self assessment deadline is a critical moment in every accounting practice. Using a standardised checklist ensures all income sources are captured, reliefs are claimed, and deadlines are met, reducing last-minute stress and protecting your firm from errors.
Why do you need a structured SA checklist?
SA is notorious for being a source of errors due to missed income or overlooked expenses. A checklist provides peace of mind that all data is present.
Clients often forget about small income sources like interest or dividends, which can lead to HMRC queries.
Ensuring you capture all relevant details early gives you time to plan and communicate with the client.
What information should you always request?
Always request P60s, P45s, interest certificates, dividend vouchers, and rental income schedules. Do not wait for the client to provide them—ask explicitly.
Key SA information categories
- Employment income
- Self-employed earnings
- Dividends and interest
+ 2 more in the full download
Checklist preview
0/4 done · showing 4 of 15 itemsThe full 15-item checklist is in the download below. Enter your name and email to get it as a Word or PDF file.
This is a standard checklist. Each firm's requirements may vary, so please cross-check everything against current GOV.UK, Companies House and professional body guidance before relying on it.
See it working with your own clients
A 30-minute walkthrough using your services, deadlines and templates.
Turn this into a task and subtask template in Remindoo
Save each group as a task with subtasks, attach it to the right service and let recurring tasks create it for every client, every period. Each item gets an owner and a deadline, and nothing depends on someone remembering to print the list. See task and subtask templates.
What are the common mistakes?
- Overlooking small dividend payments
- Missing pension relief claim opportunities
- Filing returns without client signature
- Failing to reconcile income against bank statements
- Leaving filings until January
“Automated reminders and task templates save countless hours each week.”
Frequently asked questions
When is the deadline?
31 January for online returns; 31 October for paper.
What if they have foreign income?
Always require a full breakdown of foreign tax paid to claim appropriate tax credits.
Do I need the original documents?
Digital copies are usually sufficient, but verify they are clear and readable.
How should I get approval?
Use a secure electronic signature feature to get a clear audit trail of the client's approval.
What if they are late?
Advise them of the automatic penalties immediately; don't delay filing.
Should I offer tax planning?
Yes, use the process to identify opportunities for future year tax savings.
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Sources
Last updated 23 September 2026. General guidance, not regulatory advice.
Why recording every task matters in an accountancy practice
Accounting firms run on deadlines: VAT returns, payroll, confirmation statements, accounts and Self Assessment. Recording every job as a task, with an owner and a date, is the simplest way to make sure nothing is missed.
Avoid penalties
HMRC and Companies House charge penalties for late filing. A task for every deadline, with an internal date before it, gives the team a buffer.
Nothing depends on memory
Recorded tasks mean work continues when someone is off sick, on leave or has left the firm.
Consistent quality
Subtask checklists make every job follow the same steps and reviews, whoever does the work.
Visibility for managers
Filters by owner, status and deadline show at a glance what is late, what is due and who needs help.
Practical tips from UK practice
- Set an internal deadline two to four weeks before every statutory deadline.
- Use recurring tasks for repeat work such as VAT, payroll and bookkeeping.
- Break larger jobs into subtasks, including a review step.
- Comment on the task instead of by email, so the history stays with the work.
Related Remindoo features
Written and reviewed by Waqas Sagar ACA FCCA FMAAT, Chartered Accountant with 18+ years in practice. Founder and MD of Accotax, an ICAEW, ACCA and AAT regulated London practice that has served over 5,000 clients, and founder of Remindoo. Guidance is general; check current GOV.UK and professional body guidance for your firm.
What UK practices say about Remindoo
Read all reviews on Trustpilot“With Remindoo, everything from the first enquiry to onboarding and ongoing client management is tracked in one place… It saves us hours and gives me, as a practice owner, complete visibility of where the firm stands.”
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“During my trial, the team were absolutely amazing. They helped onboard my clients, set up my settings and made sure everything was ready for me to use… they made the whole process completely stress-free.”
“It brings client information, tasks, recurring deadlines, workflows and reminders together in one place, giving us much better visibility across the team.”
