In the last few years, the PA Department of Revenue has begun to deny unreimbursed business expenses such as business mileage, uniforms, tools and supplies without receipts or logs. If you have these expenses, please keep your receipts. If you use your personal vehicle for business, you must keep a mileage log. It can be written or on an app. Both the IRS and states require this. Remember that commuting to work is not deductible. Union dues are still deductible on the PA return.
Every state has a use tax that is imposed on purchases made when you don’t pay the correct state sales tax. This can be done on the annual state income tax return.