The Self Assessment deadline is just four months away. The clock is ticking for many small business owners and sole traders, and it’s tempting to leave it until January. But waiting until the last minute often means stressful late nights, missed opportunities to claim expenses, and even fines if you run out of time.
Let’s make it simple. With four months still to go, you’ve got breathing space. By starting now, you can avoid the January rush, file confidently, and maybe even save money along the way.
Self Assessment Deadline Dates – Key HMRC Filing Deadlines
31 October 2025 paper returns
31 January 2026 online returns (the date most people use)
We’re now four months away from the online filing deadline. It may feel like a long time, but it’s the perfect window to start preparing calmly.
Why Start Now Instead of in January?
Here’s what happens when people wait until the last minute:
- Stress skyrockets digging through paperwork at midnight on 29 January
- Missed expenses valuable tax reliefs get overlooked in the rush
- HMRC delays phone lines and online services are swamped in January
- Risk of penalties even one day late means a £100 fine
By starting now, you can work at your own pace and avoid the chaos.
Real Stories from CWABC Clients
Sometimes, the best way to understand the value of early preparation is to hear from others who’ve been through it.
Richard White said:
“Chris has been a great help handling my accounts and tax return. He has been exceptional in his communication throughout, from the initial intro call to completing the tax return, explaining everything to me and helping relieve the stress of handling my accounts. He was also very personable throughout and always there to help with any questions I had.”
Richard’s story shows how much stress can be lifted when you’ve got clear explanations and regular support.
Irena shared:
“I have great experience with Chris, he’s helped me with my personal tax return and does my business accounting as well. He’s knowledgeable, explains things clearly and always replies quickly. I can highly recommend his services.”
Irena’s experience proves that a knowledgeable accountant doesn’t just file numbers, they make the whole process understandable and manageable.
What To Do Now To Prepare For The Self Assessment Deadline A 4 Month Checklist
1. Gather Your Records
Pull together:
- Bank statements
- Invoices for income
- Receipts for expenses (digital or paper)
- Employment records (P60/P45 if applicable)
2. Check Your HMRC Account
Log in to your Government Gateway account. If you’ve forgotten your details, reset them now. It’s much easier in September than in January.
3. Organise Your Expenses
Common allowable expenses include:
- Home office costs
- Phone and internet bills
- Business travel (mileage, fuel, train tickets)
- Insurance and professional fees
- Training and development courses
If you’re not sure what you can claim, don’t worry. This is exactly where expert guidance makes a difference.
4. Estimate Your Tax Bill
Even a rough idea helps you plan ahead financially.
5. Decide if You Need Help
If you’re thinking of using an accountant, the earlier you reach out, the more time they’ll have to help you. Many accountants are fully booked in January.
Mistakes to Avoid
- Waiting until Christmas to start
- Ignoring HMRC letters or emails
- Forgetting side hustle income (Etsy, PayPal, freelance jobs)
- Mixing personal and business expenses without keeping records
- Many people panic in January, but by then the Self Assessment deadline is right on top of you, and options are limited.
FAQs
Do I have to file if I didn’t earn much?
Yes. If HMRC has told you to file, you must submit a return, even if your income was small.
What if I can’t pay my bill?
File your return anyway. HMRC are far more understanding if you’ve filed on time, and you can usually set up a payment plan.
Can I file now but pay later?
Yes. Filing early doesn’t mean paying early. You still have until 31 January to pay, even if you submit your return in October. Filing early means you can stop worrying about the Self Assessment deadline and focus on your business.
What if I’ve lost receipts?
You can still claim expenses if you have other proof, like bank statements or mileage logs. Always declare honestly and include what you reasonably can.
The CWABC Approach
You don’t have to do this alone. With CWABC, you get:
- Clear, jargon free advice in plain English
- Friendly, personal communication from start to finish
- Accurate filing so you avoid HMRC penalties
- Support that fits around your business, not the other way round
Like Richard and Irena discovered, the right help makes the whole process quicker, clearer, and far less stressful.
Next Steps
You’ve got four months. That’s plenty of time. But the earlier you act, the calmer the process will be.
- Start gathering your paperwork this week
- Make sure you can log in to HMRC
- Speak to an accountant if you’d like expert support
Remember: filing early doesn’t mean paying early. It just means you can tick the Self Assessment deadline off your to do list and breathe easier.
Need help with your accounts?
I offer simple, friendly support for sole traders, landlords, and small business owners.
