Walmart is offering $5 gift cards to Alabama customers who were mistakenly overcharged sales tax on Friday when the state’s new sales tax reduction went into effect — provided shoppers kept their receipt, the company announced Tuesday.

Both the megaretailer and Sam’s Club accidentally charged customers both the new and previous sales tax rates on groceries in Alabama.

Walmart corrected the issue by Friday night.

Alabama customers who shopped at Walmart on Friday are eligible for a $5 gift card.

“To be eligible, customers will need to bring their receipt, dated September 1, 2023, showing the overcharged sales tax to the customer service desk at any Alabama Walmart store,” Walmart said in a statement issued Tuesday.

The gift cards will be available through Sept. 18

Sam’s Club customers impacted by the sales tax snafu will automatically have $5 in Sam’s Cash applied to their account.

According to Alabama Arise, the 1 percentage point reduction will save an Alabama family of four about $150 a year.

The sales tax rate is expected to drop an additional 1 percentage point in September 2024, bringing the total two-year cut to 2 percentage points – but only if the state’s Education Trust Fund has grown by 3-1/2% over the previous fiscal year. If the growth projections don’t occur, the second 1% cut will be delayed until the ETF growth requirement is met.