A BILL TO AMEND THE SOUTH CAROLINA CODE OF LAWS BY AMENDING SECTION 12-6-510, RELATING TO INCOME TAX RATES FOR INDIVIDUALS, ESTATES, AND TRUSTS, SO AS TO REDUCE THE INCOME TAX RATE TO A FLAT 3.99 PERCENT AND TO SET FORTH STANDARDS FOR ADDITIONAL REDUCTIONS; BY AMENDING SECTION 12-6-50, RELATING TO INTERNAL REVENUE CODE SECTIONS SPECIFICALLY NOT ADOPTED BY THE STATE, SO AS TO NOT ADOPT THE FEDERAL STANDARD DEDUCTION AND ITEMIZED DEDUCTION; BY AMENDING SECTION 12-6-1140, RELATING TO INCOME TAX DEDUCTIONS, SO AS TO ALLOW FOR A SOUTH CAROLINA INCOME ADJUSTED DEDUCTION (SCIAD); BY AMENDING SECTION 12-6-4910, RELATING TO PERSONS REQUIRED TO FILE A TAX RETURN, SO AS TO MAKE A CONFORMING CHANGE TO THE CALCULATION; AND BY AMENDING SECTION 12-6-1720, RELATING TO ADJUSTMENTS TO THE TAXABLE INCOME OF NONRESIDENT INDIVIDUALS, SO AS TO MAKE A CONFORMING CHANGE.