The allowance for my parents is split into few portions: I credit a fixed allowance of $150 per month for offsetting some giro deduction expenses and give cash as & when needed. I pay for the grocery purchases made with the supplementary credit card I pay for the internet + mobile lines + insurance instalments Generally $600 - $800 per month, which is approx 20 - 25%? Depending on individual's income and expenses, someone's 10% maybe equivalent to your 20% or vice versa, so it's really hard to judge, based on a percentage against your salary or an amount, if it's an acceptable amount to give. Also, some parents spend less and some spend more, do they spend more on needs or want? How much is enough? It's hard to define. I feel that most importantly, you need to be comfortable with the amount to give and try cover your parents' basic expenses or at least major expenses? You can do some simple calculation to work out your expenses and maybe talk to your parents to know how much allowance they would like to have, and see if it's within your means/budget. Should you have problem giving the amount they prefer, communicate and I believe they will understand.