According to Arijit Sen, SEBI Registered Investment Adviser in Kolkata, Co-founder of merrymind.in, this strategy can be a good starting point. He says, "Its applications are quite simple and easy to keep track of. However, each family will have their own uniqueness. As a result, thumb rules may not hold good always. Commitment levels within the family will determine what percentage should be considered for basic and discretionary expenses. Those who are beginning their careers and need a straightforward approach to balancing spending, saving, and investing, may consider the aforesaid thumb rule. Family expenses for a couple having no kids will differ from that of a couple having children and dependent parents. For obvious reasons, savings capacity for the couple with no kids will be higher provided the lifestyle expenses are well within limits. For them, the thumb rule may not give proper direction. Families having higher liabilities will definitely face issues in following the thumb rule. Those with fluctuating incomes, such as freelancers or commission-based workers, might find it challenging to stick to fixed percentages. Life events, changes in income, and financial goals may require you to tweak the allocations. Hence, flexibility in following any process/rule is the basic need".