Pennsylvania vs Illinois Sales Tax Nexus — Comparison 2026
Compare economic nexus thresholds, state and local rates, and filing rules in Pennsylvania and Illinois.
| Metric | Pennsylvania | Illinois |
|---|---|---|
| Economic nexus threshold | $100,000 | $100,000 |
| Transaction threshold | None | None |
| State rate | 6.00% | 6.25% |
| Avg. local rate | 0.34% | 2.87% |
| Combined state + local | 6.34% | 9.12% |
| Marketplace facilitator | Yes | Yes |
| Effective since | 2019-07-01 | 2026-01-01 |
Which state is easier for sellers?
For low-revenue sellers: nexus triggers first in both states because of its threshold. If you cross that first, you register there first.
On rate: Pennsylvania is friendlier for customers with a combined state + local rate of 6.34% vs 9.12%.
Neither state has a transaction-count trigger — only the dollar threshold matters.
Pennsylvania — nexus note
Economic nexus applies at $100,000 in gross sales into Pennsylvania in the previous twelve months. Local rates apply in Philadelphia (+2%) and Allegheny County (+1%).
Illinois — nexus note
Economic nexus triggers at $100,000 in cumulative gross receipts in the preceding twelve-month period. Illinois also applies unique "retailer occupation tax" (ROT) sourcing rules on top of the base rate.
What to do next
Use the nexus calculator to check exactly which of Pennsylvania and Illinois you've already triggered. Then read each state's full guide: