Can Ebay Legally Apply Sales Tax To Pre-discount Prices?

Location: Pennsylvania (6% sales tax)

Can eBay legally apply sales tax to pre-discount prices?

For an online purchase the receipt lists:

Item (1) - $499.99

Shipping - $0.00

Tax - $30.00

Discount - $100

Every other purchase I've ever made sales tax is applied after the discount, are they allowed to bill like this?

From the page about the discount:

Terms & Conditions

How to redeem your Coupon:

Shop for eligible items from the specific seller(s) as listed below.

Enter the Coupon code in the redemption code field: FRESHFIND20

Pay for your item by 11:59 PM Pacific Time on March 15, 2026.

Terms & Conditions:

This Coupon is a 20% discount on purchases of eligible items from the specific seller(s) listed below, valid from 5AM Pacific Time on March 2, 2026, through 11:59PM Pacific Time on March 15, 2026, or while supplies last. No minimum purchase required. The Coupon discount is capped at a maximum value of $350. Discount applies to the purchase price (excluding shipping, handling, and taxes) of eligible items purchased on eBay.com. The Coupon is applicable for all online payment methods.

Eligible items exclude warranties and protection plans, as well as items from the Coins & Paper Money, Gift Cards & Coupons, Vehicles in eBay Motors, and Real Estate categories. Coupon must be used within a single transaction (and can include multiple eligible items), while supplies last.

Max two redemptions per user. The coupon is only valid on ebay.com, ebay.ca, cafr.ebay.ca for eBay users with a registration address located in the United States and Canada. Any unused difference between the discount amount, as shown on the Coupon, and the purchase price of an item(s) in a single transaction (or cart) will be forfeited.

eBay may cancel, amend, or revoke the Coupon at any time including in response to fraudulent activity. Use of automated devices or programs for Coupon redemption prohibited.

For Canadian eBay users: Coupon is subject to Canadian laws, void where prohibited, not redeemable for cash, has no face or cash value, and cannot be combined with any other Coupon.

For US eBay users: Coupon is subject to U.S laws, void where prohibited, not redeemable for cash, has no face value, and cannot be combined with any other Coupon, or when paying with PayPal Credit Easy Payments, escrow, or gift cards.