Want to get rid of all those pesky coins?
You can choose a rounding strategy in your Orders Settings.
Rounding offers three strategies:
Always round down (so $10.99 becomes $10)
Round to the nearest dollar (so $10.50+ becomes $11; $10.49 or less becomes $10)
Round to the nearest nickel (so $.03 or $0.4 will round up to $0.05; $0.01 or $0.02 will round down).
You'll see a line item on the receipt to account for the rounding. Changing the amount you charge a customer automatically adjusts the taxes up/down to reflect the difference of the adjustment.