Menu
Book a Consultation
UK Tax Services

UK Self Assessment Tax Returns for the self-employed, landlords and partners

If you are self-employed, let property, are a partner in a firm or have income HMRC cannot tax at source, you need to file a Self Assessment return. We register you with HMRC, prepare your SA100 and supplementary pages, calculate your tax and payments on account, and file online before the 31 January deadline. We also prepare you for Making Tax Digital for Income Tax.

Free first consultationWritten quote before work startsNothing filed without your approval
2014Serving clients since
500+Filings completed
ACCA · ICAPQualified team
24/7Phone & WhatsApp access
Self Assessment

Self Assessment is changing, and the deadlines have not moved

HMRC's Self Assessment system still revolves around the 31 January online deadline. But from 6 April 2026, sole traders and landlords with qualifying income above £50,000 must also keep digital records and send quarterly updates under Making Tax Digital for Income Tax, with lower thresholds to follow.

You generally need to file a Self Assessment return if you are self-employed as a sole trader, a partner in a business partnership, a landlord receiving rental income, or if you have untaxed income such as foreign income, significant savings or investment income, or capital gains that need reporting. New taxpayers must register with HMRC by 5 October after the end of the tax year in which the obligation arose. The online return, form SA100 with supplementary pages such as SA103 for self-employment and SA105 for property, is due by 31 January following the end of the tax year, together with any balancing payment.

If your tax bill is above HMRC's limits, you also make payments on account towards the next year, due on 31 January and 31 July, each usually half of the previous year's liability. Late filing brings an initial £100 penalty, with further penalties the longer the return is outstanding, and late payment brings interest and surcharges. We calculate payments on account carefully and apply to reduce them where income has fallen.

Making Tax Digital for Income Tax applies from 6 April 2026 to sole traders and landlords whose qualifying income from self-employment and property exceeds £50,000, falling to £30,000 from April 2027 and £20,000 from April 2028. They must keep digital records, submit quarterly updates through compatible software and make a final declaration after the year end. We assess whether you are in scope, help choose software and prepare the quarterly updates.

Self Assessment links to our other UK services: UK income tax returns for employees and investors, UK capital gains tax and UK non-resident tax services, including for landlords living in Pakistan.

Most Self Assessment penalties come from missing 31 January by a few days. We aim to file in the autumn, not the last week of January.
What's included

What our Self Assessment service covers

A fixed fee per return, based on your income sources.

HMRC registration

Registration and UTR obtained.

Self-employment pages

Trading income and allowable expenses.

Property pages

Rental income and allowable costs.

Partnership pages

Your share of partnership profits.

Foreign income

Overseas income and foreign tax credit.

Payments on account

Calculated and reduced where appropriate.

Online filing

Return filed with HMRC.

Making Tax Digital

Scope check, software and quarterly updates.

Risks we prevent

Self Assessment mistakes we help avoid

These cause penalties, interest and HMRC enquiries.

01

Registering late

Registration is due by 5 October after the tax year.

We register you.
02

Filing after 31 January

An initial £100 penalty, rising over time.

We file early.
03

Unclaimed expenses

Allowable business and property costs left out.

We review expenses.
04

Payments on account forgotten

The 31 July payment catches many people out.

We remind you.
05

Foreign income missed

UK residents must report worldwide income.

We include it.
06

MTD not ready

Quarterly updates required from April 2026 for many.

We prepare you.
How we work

How we prepare your return

Started after 5 April, filed well before 31 January.

Free

Review

We check your income sources and obligations.

Before work starts

Fixed fee

Agreed per return.

From April

Collect

Records, statements and expenses.

Autumn

Prepare

Return and tax calculation reviewed with you.

Before 31 Jan

File and pay

Return filed and payments scheduled.

Who we work with

Self Assessment returns for

Sole traders

Self-employed individuals and contractors.

Landlords

UK and overseas property income.

Partners

Members of business partnerships.

Freelancers

Consultants and digital workers.

People with foreign income

UK residents with income abroad.

Pakistanis with UK income

Returns handled remotely.

Why Finvocates

Why file with Finvocates

UK Self Assessment from a team that also understands Pakistani tax.

QuickBooksXeroTally ERPSAPOracle

Early filing

Returns prepared well before the deadline.

Qualified professionals

ACCA and ICAP Chartered Accountant qualifications.

Two-country view

UK and Pakistan tax considered together.

MTD ready

Help with software and quarterly updates.

24/7 phone and WhatsApp

Easy contact from the UK or Pakistan.

Clear fixed fees

Agreed per return.

FAQs

UK Self Assessment questions we hear most

Have a question that is not here? Send it to us on WhatsApp and we will reply the same day.

Who needs to file a Self Assessment return?
Typically sole traders, partners, landlords and people with untaxed income such as foreign income, significant savings or investment income, or capital gains to report.
When is the Self Assessment deadline?
The online return is due by 31 January after the end of the tax year, which ends on 5 April. Paper returns are due by 31 October.
When must I register for Self Assessment?
By 5 October after the end of the tax year in which you first needed to file.
What are payments on account?
Advance payments towards next year's tax, due on 31 January and 31 July, each usually half of the previous year's liability, where your bill exceeds HMRC's limits.
What is the penalty for filing late?
An initial £100 penalty, with further penalties if the return remains outstanding after three, six and twelve months.
What is Making Tax Digital for Income Tax?
From 6 April 2026, sole traders and landlords with qualifying income over £50,000 must keep digital records and send quarterly updates. The threshold falls to £30,000 from April 2027 and £20,000 from April 2028.
Can you help if I live in Pakistan and have UK income?
Yes. We prepare returns for non-residents with UK income. See UK non-resident tax services.
How much does a Self Assessment return cost?
We charge a fixed fee per return based on your income sources. Your first consultation is free.

File your Self Assessment early this year

Tell us about your income sources. We will confirm what you need to file and quote a fixed fee.

Book your free consultation

This page is general information about our services, not tax, legal or financial advice for your specific situation. Laws, rates and deadlines change with each Finance Act and official notification.