TaxSimba — Self Assessment for Sole Traders: What You Need for Your 2025/26 Tax Return
Preparation worksheet

Optional offline planning aid, not a tax return or filing confirmation.
Keep completed notes securely; never include passwords or one-time codes.

WORK THROUGH THIS EXAMPLE
Your business records reconcile, but a P45 and CIS statement are outside the folder. Add those documents to the personal-return pack. A correct trading-profit figure is only part of a return that must also reflect other relevant income and tax already deducted.

DECISION TO RESOLVE
What information belongs on the personal return beyond the business accounts?

YOUR POSITION
Relevant year and source: ____________________
Evidence supporting your answer: ____________________
Missing item and who will obtain it: ____________________
Deadline or next review date: ____________________

1. Confirm the tax year and accounting basis.
Notes: ______________________________

2. Reconcile bank, cash and platform sales.
Notes: ______________________________

3. Group expenses and mark private-use shares.
Notes: ______________________________

4. List equipment purchases and disposals.
Notes: ______________________________

5. Gather other income, reliefs and prior payments.
Notes: ______________________________

Actions agreed and responsible person:
____________________________________

Guide: https://taxsimba.co.uk/blogs/self-assessment-for-sole-traders-2025-26
Check the current guide and official sources before relying on a deadline or process.