If you're already thinking of back-to-school shopping, you may get a price break in the next few weeks.

Though 45 states and the District of Columbia typically collect sales tax, 16 states have decided to either cut the amount of sales tax they charge or to not charge sales tax at all during various weekends this summer. 

While shopping, keep in mind that most states have limits on how much you can purchase without paying taxes. Louisiana, for example, knocks its 5 percent sales tax down to 3 percent on up to $2,500 per item purchased. Tennessee forgives its full 7 percent sales tax on computers that cost up to $1,500. South Carolina does not place a limit on eligible purchases.

You may not have to pay state tax, but you still could owe county and city sales tax, though some municipalities may give you a break for clothing and school supplies. In New York City, clothing and footwear purchases under $110 are spared the city's hefty 8.875 percent sales tax

The average family plans to spend an average of $501 per kid on back-to-school shopping, according to Deloitte, the consulting company. Depending on where you shop, those savings could really add up. 

Tax Breaks State by State

Here's when to do your back-to-school shopping in the following 16 states:

Alabama: July 21-23
Alabama’s 2017 sales tax break applies to qualifying clothing that costs up to $100 per item. You also get the savings on computers and computer supplies that cost up to $750, and school supplies up to $50.

Arkansas: August 5-6
Clothing that costs less than $100 per item as well as some kinds of electronic equipment and school supplies will qualify. To get more details, go to Arkansas.gov. 

Connecticut: August 20-26
Connecticut’s 2017 sales tax break includes certain clothing and footwear that sell for less than $100 per item.

Florida: August 4-6
The back-to-school tax break in Florida applies to clothing that costs up to $60 per item, some school supplies that sell for up to $15, as well as personal computers and certain computer-related accessories that cost up to $750. You can get more details at Florida's Department of Revenue website.

Iowa: August 4-5
Iowa’s 2017 sales tax holiday includes select clothing and footwear less than $100 per item.

Louisiana: August 4-5
Louisiana’s 2017 sales tax holiday includes almost all items of tangible, personal property up to $2,500 per item.

Maryland: August 13-19
If you need to buy a backpack or a book bag, there is no tax on the first $40 of the cost. There are also other items covered, including qualifying clothing and footwear up to $100 per item. 

Mississippi: July 28-29
Mississippi’s 2017 sales tax holiday includes qualifying clothing and footwear that sell for less than $100 per item. 

Missouri: August 4-6
Missouri’s 2017 sales tax holiday applies to clothing that costs up to $100 per item, school supplies up to $50, computer software up to $350, and computers and computer accessories that cost up to $1,500. 

New Mexico: August 4-6
New Mexico’s 2017 sales tax holiday includes qualifying clothing less than $100, computers less than $1,000, computer hardware less than $500, and school supplies less than $30.

Ohio: August 4-6
Instructional materials your kids may need at school are tax-free as long as they cost less than $20. So too are school supplies. Ohio’s 2017 sales tax holiday also includes qualifying clothing that cost up to $75 per item.

Oklahoma: August 4-6
Oklahoma’s 2017 sales tax holiday includes qualifying clothing and footwear that cost less than $100 per item.

South Carolina: August 4-6
If your back-to-school list includes printers, software, linen, and even footwear, South Carolina’s 2017 sales tax holiday is a good time to make these purchases. 

Tennessee: July 28-30
Tennessee’s 2017 sales tax holiday includes qualifying clothing that costs up to $100 per item, school supplies up to $100, and computers up to $1,500.

Texas: August 11-13
Texas’ 2017 sales tax holiday includes qualifying clothing, footwear, backpacks, and school supplies less than $100 per item.

Virginia: August 4-6
While you're shopping for school supplies and back-to-school clothing, you can also pick up emergency preparedness products plus Energy Star appliances and benefit from the tax break. You can get more details at the Commonwealth of Virginia's tax website.