Yes, an accountant can take your whole Self Assessment off your hands, from working out what you owe to filing it with …
Self Assessment Tax Return Accountant in London
Struggling with Your Self Assessment Tax Return? Let the Experts Handle It. The last few months of the year also come with an increased need to ensure any self assessment tax returns prepared is correct and filed appropriately and within the stipulated time. Confusing HMRC rules, risk of penalties and time consuming paperwork. The Stress of Self Assessment You are Not Alone.
Who needs Self Assessment help?
If any of this sounds like you, we can take the tax return off your plate.
Self-employed or freelancer
Report your income and expenses correctly and claim what you're entitled to.
Landlord or property income
Rental income, allowable expenses and property tax handled correctly.
Company director or dividends
Salary, dividends and director income reported accurately to HMRC.
CIS subcontractor
CIS deductions checked and refunds claimed where you've overpaid.
Foreign income or UK income while abroad
Cross-border income and residence position reviewed with care.
High income, Child Benefit charge or complex tax affairs
Multiple income sources and the High Income Child Benefit Charge reviewed together.
What IBISS & CO handles for you
A complete Self Assessment service, from records to submission
- Tax return preparation and submission
- Income and expense review
- Rental income and property tax checks
- CIS refund support
- Dividend and director income reporting
- HMRC correspondence support
- Post-submission records and advice
How the process works
Three simple steps from your records to a filed return.
1
Share your records
Send your income, expenses and paperwork securely. We’ll tell you exactly what’s needed.
2
We review and prepare
Our team checks your figures, prepares your return and explains what it means for you.
3
Share your records
We file with HMRC on your behalf and stay on hand if any questions come up afterwards.
MTD FOR INCOME TAX
Making Tax Digital for Income Tax 2026
From 6 April 2026, sole traders and landlords with qualifying income over £50,000 must keep digital records and send quarterly updates to HMRC using compatible software. From April 2027, this extends to qualifying income over £30,000.
2025/26 Self Assessment deadlines
Late filing and late payment penalties can apply, so it’s worth knowing every date.
| What | Deadline |
|---|---|
| Register if new | 5 October 2026 |
| Paper tax return | 31 October 2026 |
| PAYE tax code collection deadline | 30 December 2026 |
| Online tax return | 31 January 2027 |
| Pay the tax owed | 31 January 2027 |
| Second payment on account | 31 July 2027 |
Why choose IBISS & CO?
Accurate filing
Careful checks before anything is sent to HMRC.
Tax efficient review
We check your position for legitimate reliefs and allowances.
Clear communication
Plain English updates, not jargon.
Ongoing support
We're here after submission, not just at deadline time.
Need Tax Return Service
Late filing penalties double from April 2026. Speak to a self assessment tax advisor today. Get a free consultation and discover how we can help. Click below to get started now!
Frequently asked questions
Do I need to file a Self Assessment tax return?
You usually need to file if you’re self-employed, a landlord, a company director receiving dividends, or have other untaxed income. We can check your situation and confirm.
Can you help with rental income?
Yes. We review rental income and allowable expenses and make sure your property tax position is reported correctly.
Can you help if I live abroad but have UK income?
Yes. We review your residence position and any UK-source income to help you report it correctly to HMRC.
What happens if I miss the deadline?
Late filing and late payment penalties can apply. If you’re close to a deadline, contact us as soon as possible so we can help you act quickly.
Can you review a tax return before I submit it?
Yes. We can review a return you’ve already prepared and flag anything that needs correcting before it goes to HMRC.
How much does the service cost?
It depends on the complexity of your income sources. We provide a clear, fixed quote after a short review of your situation no hidden costs.
Can you help with MTD for Income Tax?
Yes. We can review whether MTD for Income Tax applies to you and help you get set up with compatible digital record-keeping software.
Contact Us Online
Confused Where To Start?
Schedule a Free 15-minute discovery call by providing your contact details, mentioning your requirements, and selecting a convenient date for the call.
How our discovery call works:
- Complete Our Contact Form
- Discovery Calls Scheduled
- Receive a Tailored Proposal
IBISS Offices Location
Reviews
Google
Facebook
Vouchedfor
Trustpilot
Google
IQBAL ZAFAR
I have been IBISS & CO client for past 7 years. Their team is professional and proactive who assist me in filing my overseas and UK tax disclosure.
Ahmed Hussain
I’ve used them for the past few years now and I am very satisfied with their services. The staff are very amicable as well. Definitely recommend them.
Stephen Hudson
The response of IBISS and Co to my tax problem was rapid and professional. The advisor understood the problem and recommended
Andrea Callegari
Excellent service! Provided a clear explanation to my matter in a timely manner. Very helpful and polite. Highly recommend.
Facebook
John Mitchell
“IBISS & CO provided exceptional financial guidance. Their expertise and personalized approach helped streamline our investment strategy. Highly recommend for anyone seeking top-tier financial services.”
Sarah Thompson
Working with IBISS & CO was a game-changer for our business. Their insightful advice and thorough analysis led to significant financial growth. Outstanding service!
Michael Reynolds
IBISS & CO exceeded expectations with their professional and strategic approach. They understood our needs and delivered results beyond our expectations. A reliable partner in finance.”
Emily Carter
“IBISS & CO’s financial planning transformed our portfolio. Their team’s dedication and deep market knowledge ensured we made the best decisions. A trusted partner for financial success.”
Vouchedfor
Ashton Mills
IBISS & CO provided outstanding service, handling our project with precision and care. Their expertise made a significant difference, ensuring we achieved our goals efficiently.”
Lily Parker
Partnering with IBISS & CO was a game-changer. Their dedication to excellence and proactive approach led to exceptional outcomes. Highly recommend them for any business endeavor.”
James Turner
IBISS & CO exceeded expectations. Their professional team delivered top-notch results, staying committed to our needs throughout. A trusted partner in every sense.”
Sophia Grant
Working with IBISS & CO was a pleasure. Their focus on client satisfaction and detail-oriented service ensured our project’s success. They’re a reliable and highly skilled team.”
Trustpilot
Sarah J
BISS & CO exceeded our expectations with their professionalism and expertise. Our project was delivered on time and flawlessly executed.
Mike L
Outstanding service! BISS & CO’s attention to detail and client-focused approach made all the difference
Jessica M
Working with BISS & CO was a breeze. Their team is knowledgeable, responsive, and truly cares about client satisfaction.
David P
BISS & CO delivered exceptional results on our project. Highly recommend their services for anyone seeking quality and reliability.
BLOG
Explore the IBISS blog and case studies for helpful tips on tax accounting and business advice. If you need expert support just get in touch with us. The IBISS & CO expert team accountants & tax advisers is always here to help you and your business succeed.
You pay your self assessment tax bill to HMRC, and the fastest route is approving the payment through your bank app with …
You pay Income Tax on your profit, not your turnover. Allowable expenses are the business costs HMRC lets you subtract from your …