As the basis takes your monthly income, subtract from it such regular expenses as the cost of housing, transportation, and then select 20-30% on savings or mortgage loan payment.
The rest can be spent on living: restaurants, entertainment, etc. If you are afraid of spending too much, limit yourself in weekly expenses by having a certain amount of ready cash.
"When people borrow, they think that they should return it as soon as possible," said Sofia Bera, a certified financial planner and founder of Gen Y Planning company. And at its repayment spend all that earn. But it's not quite rationally ".