I was just looking at my work pay slip and got a little freaked out! My annual salary for my job is noted as $17900 so they haven't been taking any tax out as the tax free threshold for low income earners is now 18 grand. However I have had times over the year where my rate of pay has gone up for a few shifts which could mean I am over 18 grand by a few hundred dollars. Is that going to really hurt me in regards to a tax debt then? if so how much do you think I'll owe??