As defined in the proposed legislation, the initial sales tax rate is 30%. Advocates promote this as a 23% "tax inclusive" rate based on the total amount paid including the tax ($23 out of every $100 spent in total), which is the method currently used to calculate income tax liability. In subsequent years the rate could adjust annually based on federal receipts in the previous fiscal year. With the rebate taken into consideration, the FairTax would be progressive on consumption, but would also be regressive on income at higher income levels (as consumption falls as a percentage of income). Opponents argue this would accordingly decrease the tax burden on high-income earners and increase it on the lower class earners. Supporters contend that the plan would effectively tax wealth, increase purchasing power and decrease tax burdens by broadening the tax base.