Self Assessment tax return services
Your tax return prepared and filed well before 31 January
Carter Bond prepares and files your Self Assessment tax return, and tells you what you owe and when to pay it. You send us the paperwork and we do the rest.
Self Assessment deadlines and penalties
The online deadline is 31 January, and the balance of any tax owed is due the same day. File a day late and HMRC charges a £100 penalty, with more added the longer it runs. Payments on account for the following year catch people out too, especially in the first year of self-employment.
31 Jan
Online filing deadline. The balance of any tax owed is due the same day.
£100
Penalty for filing a day late, with more added the longer it runs.
What’s included in your tax return
Your full Self Assessment return, prepared and filed online
Income from self-employment, property, dividends, savings and pensions
Allowable expenses and reliefs checked so you don’t overpay
Payments on account explained, with the dates they’re due
A summary of what you owe and when
How it works
Tell us your sources of income and send last year’s return if you have one.
We send a short checklist of what we need.
We prepare your return and talk you through the figures.
You approve it, we file it, and you get confirmation from HMRC.
Self Assessment and Making Tax Digital
If your self-employment and property income is over £50,000, Making Tax Digital for Income Tax has applied to you since April 2026. The threshold drops to £30,000 in April 2027 and £20,000 in April 2028. We’ll tell you if and when it affects you, and handle your quarterly updates alongside your return.
£50,000
Since April 2026
£30,000
From April 2027
£20,000
From April 2028
Why Carter Bond
Carter Bond already pays contractors through umbrella and CIS, and completes Self Assessment returns for CIS subcontractors. We know how that income is taxed and what to check on your return. Our team is based at Gunwharf Quays in Portsmouth.
Self Assessment FAQs
When is the Self Assessment deadline?
31 January for online returns, and 31 October for paper returns.
What happens if I file late?
HMRC charges £100 if your return is up to three months late, with further penalties after that.
Do I need a tax return if I’m paid through an umbrella company?
Not usually, if PAYE is your only income. You may still need one if you have other income, such as rent or self-employed work.
Send us last year’s return, or tell us it’s your first. We’ll confirm the cost.
Get in touch
For any enquiries or to explore your vision further, we invite you to contact our professional team.
- Office
- Phone
- Follow us