If you moved your permanent residence from state A to state B during the year, then you must file a part-year resident tax return with state A and a part-year resident return with state B. You allocate your income based on where you were living at the time the income was received. In your case, lump sum taxable income paid in February would be assigned to AR only. However, if you also received (for example) $2000 per month social security benefits, you assign $20,000 (10 months) to AR and $4000 (2 months) to AL.