Key details of how rounding works (and what's proposed)
The rounding applies only to cash payments — electronic payments (credit cards, digital wallets, etc.) are not affected. The proposed standard rounding method is "symmetric" rounding: If the total ends in 1 or 2 cents → round down to the previous nickel (e.g. $4.02 → $4.00). If it ends in 3 or 4 cents → round up to next nickel ($4.03 or $4.04 → $4.05). If it ends in 6 or 7 cents → round down to 5 cents ($4.06 → $4.05). If it ends in 8 or 9 cents → round up to the next nickel/dime (e.g. $4.08 → $4.10). Transactions ending in 0 or 5 cents remain unchanged. According to economic-analysis (e.g. from the Federal Reserve Bank of Richmond), this rounding will likely have a negligible impact on inflation overall; the so-called "rounding tax" — extra cost to consumers — is expected to be minimal.