Many restaurants may charge an automatic 15% or more gratuity for larger groups. This is up to the individual establishment but is usually applicable to groups of 8 or more. Some restaurants also "auto-grat" groups from countries that don't normally tip. A "tip" for calculating the appropriate tip at a restaurant is simply to multiply the 5% GST (Goods and Services Tax) amount shown on the bill by three--three times 5% is 15%. The GST has been replaced by the HST (Harmonized Sales Tax) in Ontario (13%) and the Atlantic provinces (13% to 15%) and, depending on the amount, it may be easy to round up to 15%. Please remember that in Quebec servers are automatically taxed on 8% of their gross sales each payday. If you have a meal for two that costs $100 before taxes and you don't leave a tip the server will be taxed on $8 of that sale - so serving you has actually cost the server money.