Senior Accessible Housing Act This bill allows a refundable income tax credit to individual taxpayers who have attained age 60 for expenditures in their residences for the installation of entrance and exit ramps, the widening of doorways, the installation of handrails, grab bars, and non-slip flooring. The amount of the credit is reduced if a taxpayer's adjusted gross income exceeds certain threshold amounts and is limited to a lifetime amount of $30,000 over amounts paid in previous taxable years.