Additional freelance income declaration

I am employed full-time but I did some freelance website development work this year in addition to my normal salary. I wasn't aware at the time that I was going to get the work so didn't submit any provisional tax beforehand. How do I specify this additional income on my tax return?

You would answer the Local Business income section on your personal tax return and include the income there. You can also include any expenses that relate to the money you earned in that way and these will reduce the amount of tax you pay on the income.