Sole Trader Tax – A Guide for Start-Ups & the Newly Self Employed

Taxes a sole trader (self employed) need to know about

In this guide, we look at the taxes you will encounter if you start your own business as a sole trader, and other things you should bear in mind before taking the plunge and becoming self employed.

Before you start up in business, one of the first decisions you need to make is which business structure to work under.

The most popular options are to set up your own limited company or to work as a sole trader. It is an important decision, and one that is influenced by your personal situation and long-term plans for your business.

If you haven’t decided which business structure to use for your new venture, you should read these articles;

Sole trader businesses and limited companies taxed differently

One of the most fundamental differences between the two types of business structure is how each one is assessed for tax purposes.

A limited company is taxed as a separate legal entity from its owners and directors, whereas sole traders (and partners in partnerships) and their business are taxed as one single entity.

Limited companies are subject to Corporation Tax on their annual profits, and directors must fill in an annual self assessment return to cover any income they have drawn from the company.

All self employed people (sole traders and partners in a partnerships) are taxed via the self assessment system each year, and pay income tax and National Insurance Contributions on their business profits after deductions for expenses.

Registering as self-employed

It is very quick and easy to register as self employed. For full details of what the process involves see our dedicated guides on;

Self Assessment Tax Returns

After you have registered as self employed, you should automatically be sent a self assessment notice following the end of each tax year, which runs from 6th April to 5th April every year.

The days of submitting a paper tax return are almost behind us, with HMRC encouraging all taxpayers to submit their self assessment returns online these days.

This is the most surefire way to submit your return. You can find out more at HMRC’s Self Assessment Online.

The deadline for submitting a paper tax return is the 31st October after the end of the tax year in question. Filing your tax online gives you an extra 3 months to complete your return as the deadline for submitting a return online is the 31st January after the end of the tax year.

For example, for the tax year running from 6th April 2017 to 5th April 2018, a paper tax return will need to be submitted to HMRC by 31st October 2018. If you opt to do it online, you will have until 31st January 2019 to submit it.

Any tax you owe for that tax year, must be paid in full by the 31st January deadline. When completing your return make sure you avoid these 10 Common self assessment tax return mistakes.

Payments on account

Once you have started to pay tax through the annual self assessment tax system, you will also have to make ‘payments on account’. These are essentially advance payments for the tax you are likely to owe for the current tax year.

Payments on account are payable to HMRC in two instalments every year, the first on 31st January and the second on 31st July. Each payment is equal to half the amount of tax you owe for the previous tax year.

If you are paying tax through the self assessment system for the first time, you need to watch out as this might make your first tax bill much bigger than you were expecting.

For example, if you started your business in May 2017, you would need to complete a self assessment tax return for the tax year from 6th April 2017 to 5th April 2018.

You would need to complete the tax return for this period, and pay any tax liability to HMRC by 31st January 2019.

In addition to your tax bill for 2017/18, you would also need to pay the first payment on account for the 2018/19 tax year by the same date.

If your self assessment tax bill for 2017/18 was £10,000, you would need to pay this, plus an additional £5,000 payment on account (half of the tax owed for the previous tax year) for the 2018/19 year by the same 31st January 2019 deadline.

It’s therefore imperative that you take this into account and put aside enough money to cover your tax bills when they are due. If you are late filing your tax return or paying your tax, HMRC will fine you.

If you believe your income for the following tax year will be significantly lower, you can apply to HMRC to reduce your payments on account.

How much will my tax bill be?

For the 2018/19 tax year, the personal allowance has been increased to £11,850. This is the amount you can earn before paying any income tax at all.

For income in 2018/19 above this threshold, you will be taxed at the following levels;

  • The Basic Income Tax rate of 20% on income up to £46,350
  • The Higher Income Tax rate of 40% on income between £46,351 and £150,000
  • The Additional Income Tax rate of 45% on income over £150,000.

For ideas on how you could pay less tax, read; 10 Ways small business owners can pay less tax

National Insurance Contributions (NICs)

In addition to income tax, as a sole trader, you will also need to make National Insurance Contributions (NICs). The amount you have to pay depends on the level of your earnings.

There are currently two types of NICs sole traders have to pay. There are Class 2 NICs – which are £2.95 per week (2018/19 Tax Year) – and Class 4 NICs.

HMRC will work out the amount of Class 4 NICs you are liable for during the annual self assessment process. It is based on the amount of profit you make, essentially 9% on your earnings between £8,424 and £46,350, and 2% on any profits above this.

Other types of tax – VAT

The self assessment process will take care of most of your tax obligations – it includes details of any income you have received from savings and investments, the disposal of assets, or income from renting out property.

If your business has a turnover of more than £85,000 (for the year from April 2017) over a 12 month period, you must also register your business for Value Added Tax (VAT).

When you are VAT-registered you will need to ad VAT to all your bills. You will also be able to reclaim the VAT you have paid on business costs.

In some circumstances, it may be beneficial to register your business for VAT, even if your turnover is below the VAT threshold. This is usually the case if the majority of your clients are business customers who can reclaim the VAT you charge them.

Get more detailed help on VAT in;

Having a dedicated business bank account

Although there is no legal requirement for the self employed to have a separate business bank account. It will help you keep more accurate financial records, and save valuable time for you and your accountant when it comes to producing your accounts, if you do have a distinct business bank account.

Even if you wanted to use your personal bank account, many banks will stop you from using it for business purposes if the number of transactions increases significantly.

Most banks offer 12 to 18 months of free banking for a new business. After this, you’ll typically be charged a monthly account fee of around £6.50/month for a business current account, plus transaction fees.

Opening a bank account with a High St bank can take some time, so if you’re in a rush you should look at opening a business current account with a Challenger Bank such as Cashplus as they claim they can open an account in just 6 minutes.

It’s also highly recommended if you have any history of poor credit, as unlike high street banks, they don’t credit check new customers.

Keeping accurate financial and business records

Aside from keeping on top of your business cashflow, keeping clear and accurate records of all your sales and expenses is crucial to the survival of your new business.

You should keep all your receipts, invoices, bank statements, and any other paperwork, in a safe place.

These days there are online accounts packages that can simplify the financial side of things and save you time. Most include a facility for you to create and send invoices, track payments, link directly to your bank account, log expenses and automatically calculate your VAT.

Some of the online accounting packages available let you have a free trial so you can try them out and see whether they suit you. Those offering a free trial include FreeAgent and Sage Business Cloud Accounting.

If you register for a 30-Day Free Trial with FreeAgent here you will enjoy a 50% discount on your first 6 months, PLUS a 10% Lifetime discount for ByteStart users.

Taking out a Free 30-Day Trial today with Sage, qualifies you for a 50% discount off your first 3 months should you decide to continue after your free trial. This means you can enjoy the Starter Package for just £5/mth. Full details of this special offer here.

Our guide on How to choose the best online accounting software for your business tells you more about how online accounting works and help you to make the right choice.

You may be able to claim various allowances to reduce the amount of tax you have to pay on your business profits. You can view a list on the HMRC site, and make sure you ask your accountant if there are ways you can save tax.

More help on ByteStart

ByteStart is packed with help and advice on all aspects of starting your own business;

Tax & Accounting

Starting Up

Funding your business

Finding customers


Remember to get professional advice from a qualified person before taking any action. Don’t rely purely on information contained in this article.

Bytestart Limited

11 responses to “Sole Trader Tax – A Guide for Start-Ups & the Newly Self Employed”

  1. Hotelman says:

    My business is growing and I need to hire others to help but its only on casual basis is this allowed?

  2. chrisB79 says:

    When starting as a sole trader, its appears that I pay NICS and tax by 31ST of the Following January. How do I calculate that, so if I take a wage everymonth I know how much to put aside for ‘the bill’ and also I read we have to pay 50% more for the first year in advance for the next tax year ?

  3. Rick says:

    im a sole trader and getting work from a company, when i submit my invoice on a weekly basis , the company stops 20% tax on my earning ,is this corect

    • bytestart says:

      Without knowing the exact details it’s difficult to comment, but it’s not usual for a company to deduct tax before paying a sole trader. However if you work in the construction industry, this may be done under the Construction Industry Scheme.

  4. Alice says:

    Hi, My brother is setting himself up as a self-employed electrician. He is at the stage where he needs to buy tools and work is due to start but as it is only a few weeks to the new financial year does it make sense to hold off making any purchases etc to avoid having to file a return for this financial year?

    • bytestart says:

      Your brother should speak to an accountant. Without knowing the specific details it’s impossible to be certain but I wouldn’t have thought foregoing on paid work to save a little time on administration and completing a tax return would make financial sense.

      Also, if your brother was previously employed in the 2014/15 tax year, it may be possible to offset any self-employed losses against any income received from employment during the year. This could create an income tax refund. It is definitely worth speaking with an accountant.

      • Alice says:

        Thanks for the advice. It sounds like he should forge ahead with setting up his business straight away.

  5. Danny Joice says:

    I’ve received a £100 fine from hmrc for not completing my self assessment however I was not self employed until after April 4th 2014, what should I do as I was under the impression I wouldn’t need to complete a tax return until January 2016

    • bytestart says:

      I suggest you speak with HMRC. It may be an error, or there may be another reason why you you were required to complete a tax return for that tax year.

  6. Lisa howard says:

    My partner has become self employed sole trader on the 14th of April 2014. He received a letter saying he needs to fill out a self assesment fom for 2013-2014. He wasnt working then so what do I do

    • bytestart says:

      Lisa, the first step would be for your partner to call HMRC to check why this is the case. There should be a phone number on the letter.