Tax Drill - Computing Tax Liability Compute the 2023 tax liability and the marginal and average tax rates for the following taxpayers. Click here to access the 2023 tax rate schedule. If required, round the tax liability the nearest dollar. When required, round the average rates to four decimal places before converting to a percentage (i.e. .67073 would be rounded to .6707 and entered as 67.07% ). 2023 Tax Rate Schedules