Five Star Tax Service Online Income Tax Tips. www.taxsupport.ca your one stop source for Canada, USA and Cross Border Taxation. These income tax tips are applicable to all businesses and specially businesses operation on line. It is important to keep detail record of all expenses so that you can offset some of your income and lower your tax rate. Tax in most countries are progressive. These income tax tips will help you reduce your marginal tax rates. Moving from a higher marginal tax rate to a lower marginal tax rate means savings of thousands of dollars in taxes.