deductde·duct /dɪˈdʌkt/ verb [transitiveT]1to take away an amount from a totalBrazil has about 48 million bags of coffee available for sale; from this, deduct about eight million bags for domestic use.
2ACCOUNTING to take away an amount from an employee’s pay for a particular purpose before they receive itWe deduct the pension contributions from employees’ paychecks.
3TAX to take away particular costs from the amount you have earned before you calculate how much tax you will have to pay on what you have earnedSelf-employed people can deduct 100% of health-insurance costs against income.