Hi, I recently looked this up. You definitely need to read about it on the Service Canada website. There is something in effect until August 2016 called the Working While on Claim Pilot Project. It changes the way they deduct money from your benefits if you are earning income while on EI. It does not apply to maternity benefits (first 15 weeks of benefits) but it does apply to anyone receiving parental benefits (the following 35 weeks of EI if you are receiving benefits for the allowable 50 weeks). I'm assuming this is what you are receiving EI for. If you are receiving maternity benefits, all earnings will be deducted dollar for dollar from your benefits. If you are receiving parental benefits, if your earnings are equal to or less than 90% of your weekly insurable earnings that were used to calculate your benefit rate, your benefits will be reduced at a rate of 50% of your earnings. Any earnings that exceed this 90% threshold, will be deducted dollar for dollar from your benefits. There are quite a few examples on the Service Canada site to show you how they would calculate exactly how much they will deduct.