Find out if HMRC is expecting a tax return from you this year.
Self Assessment –
ace it with confidence
Find out everything you need to know to feel confident about Self Assessment, including key deadlines, who needs to file and how to complete your tax return.How FreeAgent can help
Key dates for your diary
- Tax year to file for:
- 6th April 2021 - 5th April 2022
- Online tax return deadline:
- Midnight, 31st January 2023
- Final payment of tax due:
- Midnight, 31st January 2023
Breeze through Self Assessment with our helpful guides
Not sure where to start with your tax return? Browse through our topics and guides below to find the information you’re looking for.
Before the Self Assessment deadline
- GuideDo you have to file a Self Assessment tax return?GuideSelf Assessment deadlines: key dates you need to know
Our guide to the key Self Assessment dates throughout the year should help you avoid any nasty surprises.GuideHow to register for Self Assessment
Find out how and when to register for Self Assessment, and how the registration process might vary depending on your circumstances.
- GuideLearn the lingo: key Self Assessment terms explained
A breakdown of some of the key terms you’ll come across as you complete your Self Assessment tax return.GuideWorking with your accountant during Self Assessment season
Here’s how you can foster a winning relationship with your accountant during Self Assessment season.GuideEverything you need to fill out your Self Assessment tax return
A list of all the things that you’ll need to have to hand in order to complete your tax return.
- GuideHow to complete your Self Assessment tax return
Find out which sections of the tax return you’ll need to complete and what information you’ll need to provide.GuideHow to calculate your business income for Self Assessment
Find out what income you need to pay tax on - as well as the income you don’t!GuideCommon tax return mistakes to avoid
Follow these useful tips to avoid the most common mistakes that people make in the rush to file before the deadline.
- GuideHow to pay your Self Assessment tax bill
Learn more about the different ways you can pay your tax bill and how long it will take for your payment to reach HMRC.GuidePayments on account: everything you need to know
Payments on account often catch business owners out. Here’s everything you need to know.
After the deadline
It’s going to be OK! If 31st January has been and gone, follow the tips in this guide to help minimise the impact of missing the deadline.
Made a mistake on your tax return? Here’s how to fix it.
Find out what HMRC might accept as a ‘reasonable excuse’ for missing the Self Assessment deadline.
The latest Self Assessment articles from our blog
Read more about Self Assessment on our blog.
Here are the steps you can take to appeal your Self Assessment penalty if you have a reasonable excuse.
Six ways to pay a Self Assessment penalty and avoid further charges.
The 31st January deadline for filing your Self Assessment tax return for the 2021/22 tax year is fast approaching. Fortunately, there are a few easy ways to file your tax return.
Get your Self Assessment checklist
Download your all-in-one guide to completing each step of your Self Assessment tax return.
Self Assessment videos
What information do I need to fill out my Self Assessment?
What taxable expenses can I include in Self Assessment?
How do I record pension contributions?
Complete your Self Assessment tax return with confidence
If you're a sole trader or a limited company director, FreeAgent works away in the background to calculate your Self Assessment liability and prepare your tax return.Get Self Assessment tax-confident
Already a FreeAgent customer?
Our Knowledge Base has lots of helpful information about filing your Self Assessment tax return using FreeAgent.