“Total number of allowances you are claiming” is a noun phrase referring to the count of personal exemptions an individual declares on their tax return. For instance, if on your income tax return you state that you can claim two allowances, then your “total number of allowances you are claiming” is two.
This number affects the amount of tax withheld from your paycheck and the potential for a tax refund or having to pay additional taxes. Historically, the number of allowances was based on dependents; however, recent tax reforms have changed how allowances are calculated and their impact on tax liability.