Keystone Connections

For faster processing of return and payments use these addresses:

Refund or Credit Due
PO Box 509
Irwin PA 15642

No Payment/No Refund
PO Box 549
Irwin PA 15642

Payment Enclosed
PO Box 529
Irwin PA 15642

Individual Quarterly Estimate
PO Box 539
Irwin PA 15642



For assistance, call our Taxpayer Helpline: 1-888-328-0565

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