How to register your own business for taxes with HMRC

To register your business for taxes, you must notify HMRC as soon as you start trading to avoid potential penalties. If you are operating as a sole trader, you must register for Self Assessment by 5 October in your business's second tax year. If you have set up a limited company, you must register for Corporation Tax within three months of starting business activities (such as buying, selling, or renting a workspace).

Choosing the right path

The way you register depends entirely on the legal structure you have chosen for your business. Because you are starting a tax preparation business, it is particularly important to lead by example and get your own house in order before you start advising others.

1. Registering as a Sole Trader

If you are working for yourself, you are a sole trader. Even if you haven't yet earned a profit, you need to register for Self Assessment if you earned more than £1,000 from your business between 6 April and 5 April of the following year.

• Create a Government Gateway account: If you don't have one, you'll need to set this up on the GOV.UK website.
• Register for Self Assessment: Once logged in, you can register for "business taxes".
• Wait for your UTR: HMRC will post your Unique Taxpayer Reference (UTR) to your home address. Keep this safe; you will need it for every tax return you file in the future.

2. Registering as a Limited Company

If you have already registered your business with Companies House, you are a separate legal entity. HMRC will usually send a letter to your registered office address shortly after incorporation, but you must still formally register for Corporation Tax.

• Log in to your Business Tax Account: Use your company's Government Gateway details.
• Provide your details: You will need your company's 10-digit Unique Taxpayer Reference (issued after incorporation) and the date you started trading.
• Set your accounting period: This usually matches the financial year covered by your annual accounts.

Top Tip: "Trading" doesn't just mean making your first sale. It includes activities like advertising, renting an office, or buying professional indemnity insurance. If you are spending money to get the business off the ground, you have likely started trading.

Information you will need

Before you start the online application, have the following details ready to make the process smoother:

Information Required	Why you need it
National Insurance Number	To verify your identity as a sole trader or director.
Business Start Date	Determines your first tax deadline.
Business Address	Where HMRC will send official correspondence.
Company Registration Number	Only required for Limited Companies.

Deadlines and Penalties

HMRC can be strict with deadlines. If you are a sole trader and fail to register by the 5 October deadline, you could face "failure to notify" penalties, which are often based on a percentage of the tax due. For limited companies, the three-month window is equally vital. Getting registered early gives you peace of mind and ensures you receive all the necessary reminders when tax season rolls around.