Self-Employed Tax Filing Simplified
- Jason Short
- Dec 16
- 4 min read
Navigating taxes when you're self-employed can feel overwhelming. There are many rules, deadlines, and forms to keep track of. But it doesn’t have to be complicated. With the right approach and a bit of organisation, you can handle your taxes confidently and efficiently. This guide will walk you through the essentials of self-employed tax filing, helping you understand what you need to do and how to do it well.
Understanding Your Tax Responsibilities: A Self-Employed Tax Guide
When you work for yourself, you are responsible for managing your own tax payments. Unlike employees who have tax deducted automatically through PAYE, you must calculate and pay your own taxes. This includes income tax and National Insurance contributions.
Here’s what you need to know:
Register as self-employed: You must inform HMRC that you are self-employed. This is usually done online and should be done as soon as you start working for yourself.
Keep accurate records: Track all your income and expenses carefully. Good records make tax time much easier.
Submit a Self Assessment tax return: Each year, you’ll complete a tax return detailing your earnings and expenses.
Pay your tax on time: There are deadlines for submitting your tax return and paying any tax owed. Missing these can lead to penalties.
By staying organised and understanding these basics, you’ll avoid surprises and keep your tax affairs in good shape.

Key Expenses You Can Claim to Reduce Your Tax Bill
One of the benefits of being self-employed is that you can deduct certain business expenses from your income before calculating your tax. This reduces your taxable profit and lowers the amount of tax you owe.
Common allowable expenses include:
Office costs: Stationery, phone bills, internet, and rent for your workspace.
Travel costs: Mileage, public transport fares, and accommodation when travelling for business.
Equipment and tools: Computers, software, and other items needed for your work.
Marketing and advertising: Website costs, business cards, and promotional materials.
Professional fees: Accountants, legal advice, and subscriptions to professional bodies.
Make sure you keep receipts and records for all expenses you claim. HMRC may ask for evidence if they review your tax return.
Practical Tip:
If you work from home, you can claim a portion of your household bills like heating, electricity, and council tax. HMRC provides simplified expenses rates to make this easier.
How to Prepare and Submit Your Tax Return
Filing your tax return might seem daunting, but breaking it down into steps makes it manageable.
Gather your records: Collect all your income details and expense receipts.
Register for Self Assessment: If you haven’t already, register with HMRC to file your return online.
Fill in the tax return form: Use the online system or paper form to enter your income and expenses.
Check for accuracy: Review your entries carefully to avoid mistakes.
Submit before the deadline: The deadline for online returns is usually 31 January following the end of the tax year.
Pay your tax bill: You’ll receive a calculation of what you owe. Pay by the deadline to avoid penalties.
If you’re unsure about any part of the process, consider consulting a professional accountant. They can help ensure your return is accurate and maximise your allowable deductions.

Staying on Top of Deadlines and Payments
Missing deadlines can lead to fines and interest charges, so it’s important to keep track of key dates:
Register as self-employed: Within 3 months of starting your business.
Paper tax return deadline: 31 October after the end of the tax year.
Online tax return deadline: 31 January after the end of the tax year.
Payment deadlines: 31 January and 31 July for payments on account, and 31 January for balancing payments.
Setting reminders in your calendar or using accounting software can help you stay organised. Some people find it helpful to set aside money regularly to cover their tax bill, so they’re not caught out when payments are due.
Why Getting Professional Help Can Make a Difference
While it’s possible to manage your taxes on your own, many self-employed individuals find that working with an accountant saves time and reduces stress. A good accountant can:
Help you understand your tax obligations clearly.
Identify all allowable expenses to reduce your tax bill.
Ensure your tax return is completed accurately and submitted on time.
Provide advice on tax planning to improve your financial situation.
Represent you in case of any HMRC queries or investigations.
If you want to make your tax journey smoother, consider reaching out to a trusted local accountant. For those in the Staines area, self-employed tax filing support from Short and Sons Accountants offers expert guidance with fair fixed fees and a friendly approach.
Building Confidence in Your Tax Filing Process
Tax time doesn’t have to be stressful. By staying organised, understanding your responsibilities, and seeking help when needed, you can take control of your finances. Remember, every self-employed person starts somewhere, and it’s okay to ask questions and learn as you go.
Keep your records tidy, plan ahead for payments, and don’t hesitate to use professional support. With these steps, you’ll find that self-employed tax filing becomes a straightforward part of running your business.
I hope this guide helps you feel more confident about managing your taxes. If you want personalised advice or assistance, Short and Sons Accountants are ready to help you every step of the way. Your tax journey can be simpler than you think!




