The amount of SSDI monthly benefits average between $800 and $1,800 per month, and are based on a number of factors including your lifetime average earnings before you became disabled, and the amount of earnings withheld from your paychecks by your employer(s) for social security or FICA taxes.
The amounts are subject to cost-of-living adjustments (COLA). There are also a number of factors that could decrease the amounts you receive, such as whether you have income from other sources including workers’ compensation payments, public disability benefits, or payments from government pensions.