Self-assessed tax return: Guide for Self Employed & Business Owners

Truway Accounting • November 17, 2021

It's almost time to file your self-assessment tax return. If you're self-employed, it's that time of year again. The official deadline is 31 October 2021 – but it can be extended, if you use Revenue’s Pay and File system to both pay and file through ROS (Revenue Online Service).

To help you along the way when it comes to filing your tax return, read this guide for tips on registering for self-assessment and submitting your return.


Let's get Started

How to register for self-assessment?

Get your ROS Access Number

Apply online on for your ROS Access Number (RAN), which will be sent out to your postal address.

Get your digital certificate

Once you’ve received your RAN, you have to apply for your digital certificate. You do this by entering your RAN number on Revenue.ie and answering all relevant sections.


A ROS system password will be sent to your postal address. Using this password, you can retrieve and download your digital certificate, which you should name and allocate a password to.

Save your digital certificate and access Revenue Online Service (ROS)

Once you have retrieved your ROS digital certificate, you can access ROS to file your return, pay your tax and view your account.


The registration process can take up to 10 business days, so you need to get moving if you’re not registered yet.

How to complete a self-assessment tax return

You can claim certain business expenses against tax, such as rent, lighting and heating, accountancy fees, and interest paid on business loans.


Once you’re registered, you fill out a Form 11 online. Your tax liability will comprise two elements: the balance of income tax payable from 2020 and a preliminary tax liability for 2021.


The preliminary tax should usually be 90% of the current year liability. Once you know your total liability, you make your payment via ROS.


Though you don’t have to submit any supporting documents such as invoices, bank statement and receipts, you need to keep them. Because if Revenue ever audits you, you’ll be expected to provide those documents.

Tax rates

Tax rates are the same as for PAYE workers.


If you’re a single person, the first €35,300 is taxed at 20% and the balance is taxed at 40%. If you’re married or in a civil partnership with one income, the first €44,300 is taxed at 20% and the balance at 40%.


If you’re married or in a civil partnership with two incomes and doing a joint assessment, it’s a little more complicated but in principle, a married couple pays less tax than two single people, but not significantly less.


You also have to pay USC (Universal Social Charge) and PRSI (Pay Related Social Insurance) on top of your tax liability and these are both charged on your gross income.


Some good news for the self-employed is that since 2016, self-employed workers are entitled to an earned income tax credit. This was introduced to in some way level the playing field with PAYE workers, who receive a PAYE tax credit of €1,650.


The earned income tax credit is €1,500 for this year’s tax returns.



Once your tax has been calculated, ROS subtracts your tax credit to reduce the amount you actually have to pay.

Penalty for late filing

The tax due is increased by a financial penalty for late filing. If you submit your tax return within two months of the deadline, your surcharged will be 5%.


If it’s filed more than two months after the submission deadline, the surcharge will be 10% and, in addition, interest will be charged on the tax due at a rate of approximately 10% per annum.

Your deadline day

On deadline day, ROS could slow down because many of the other 700,000 self-assessed taxpayers are trying to log in.


So give yourself the time to make sure your numbers are correct, you have the required information to hand and you file your self-assessment tax return in plenty of time.

Book a FREE Consultation
By Arshiya Sethi July 27, 2022
In today's ever-increasing pandemic economy, a qualified employees is critical for any sector. In Ireland, there is a high demand for experienced IT contractors.
Donation Guide for Self-Employed & Limited Companies
By Truway Accounting April 10, 2022
The Charitable Donation Scheme allows tax relief on qualifying donations made to approved charity bodies
Tax returns for Employment-Share Schemes.
By Revenue March 14, 2022
Tax returns for Employment-Share Schemes. You must file an income tax return if you get shares from your employer and live in Ireland.
Share by: