Example 1. A calendar year taxpayer changes domicile from one Commonwealth school district to another on September 20th. September is a month during the calendar year containing 30 days. Because the taxpayer changed domicile on the 20th day of the calendar month, the day is included as a day in the new domicile instead of the old domicile. Therefore, taxpayer was domiciled in the old domicile for 19 days and the new domicile for 11 days. Because the taxpayer was in the old domicile for more than half the month of September, the taxpayer is considered a resident individual of the old domicile during September. For purposes of calculating the fraction numerator, taxpayer is a resident individual of the old domicile from January to September (9 months) and the new domicile from October to December (3 months).
Example 2. The facts in this example are the same as Example 1, except the taxpayer changes his domicile on September 16. Because September 16 is included as a day in the new domicile, the taxpayer was a resident individual for 15 days in both the old and new domicile during September. Therefore, September is included as a calendar month in the new domicile. For purposes of calculating the fraction numerator, taxpayer is a resident individual of the old domicile from January to August (8 months) and the new domicile from September to December (4 months).
61 Pa. Code § 142.1
This section cited in 61 Pa. Code § 142.2 (relating to tax rate); and 61 Pa. Code § 145.3 (relating to form).