The Chinese cheat on their taxes worse than anywhere else in the world. The tax receipt I usually receive shows they pay tax on about 15% of my actual income and that usually works out to be only several thousand $ they actually pay to the Chinese tax agency. The receipt is essentially worthless and would open you up to the Canadian tax agency for an immediate audit. Just report your income and report the meager tax the Chinese paid for you as a tax credit and work out the tax you owe. As always consult a reputable tax accountant for good advice.