- Amount before tax
- Combined rate
- Total including tax
Calculate the tax before checking the checkout total
To calculate sales tax in California, multiply the taxable price by the combined sales tax rate, then add the tax to the price. If your receipt already includes tax, work backward by dividing the total by one plus the rate expressed as a decimal.
The calculator above handles both calculations. For a 2026 purchase, you supply the applicable rate; it does not identify your location or fetch a rate automatically.
Start with the right amount and rate
Choose Add sales tax when you know the price before tax. Enter the taxable amount in dollars and the full combined rate as a percentage. For an 8.75% rate, enter 8.75, not 0.0875.
Choose Tax already included when your amount contains both the taxable price and its sales tax. The amount label changes to “Tax-inclusive amount ($).” Do not use a receipt total containing unrelated fees or exempt purchases without separating those amounts first.
Press Calculate to see estimated sales tax, the amount before tax, the entered rate and the total including tax. Reset clears the entries and returns to Add sales tax. Editing an input hides the previous result until you calculate again.
The California Sales Tax Calculator is the related calculator page. This guide focuses on choosing the correct inputs and understanding the arithmetic behind your result.
Why 7.25% is not always your final rate
California’s statewide base sales and use tax rate is 7.25%. District taxes can increase the combined rate, and more than one district tax can apply in the same area. The base already contains state and local components; it is not a separate charge to add to an advertised combined rate.
The CDTFA rate page lists rates effective July 1, 2026, alongside an address lookup and historical rates. Check the applicable address and transaction date rather than assuming one rate covers every city in a county or every month of the year.
A ZIP code alone may span different taxing areas. For delivered purchases, the delivery and district-tax rules also matter. This calculator applies the rate you enter; it does not determine which jurisdiction legally applies.
Worked example: adding tax to an $800 purchase
Assume the entire $800 price is taxable and the verified combined rate for this example is 8.75%. This is an illustrative rate, not a rate assigned to every California address.
Enter:
- Calculation: Add sales tax
- Taxable amount before tax: 800
- Combined sales tax rate: 8.75
Convert the percentage to a decimal:
8.75 ÷ 100 = 0.0875
Calculate the tax:
$800 × 0.0875 = $70.00
Add it to the price:
$800 + $70 = $870.00
The calculator displays $70.00 in estimated sales tax, $800.00 before tax and $870.00 including tax. Do not add another 7.25%: the entered 8.75% already represents the combined rate.
For broader household planning, California Calculator brings together other calculation tools. Keep a purchase’s checkout total separate from recurring costs when building your budget.
Removing tax from a tax-inclusive price
Using the same example, select Tax already included, enter 870 and keep the rate at 8.75.
Amount before tax = Tax-inclusive amount ÷ (1 + Rate ÷ 100)
$870 ÷ 1.0875 = $800.00
Included tax = $870 − $800 = $70.00
Simply multiplying $870 by 8.75% would calculate additional tax on an already taxed amount. It would not extract the tax contained in the receipt.
The tool rounds to cents. In reverse mode, it rounds the before-tax amount and subtracts that from the entered total, keeping the displayed amounts consistent. A retailer’s line-by-line calculation can differ slightly from a calculation on the combined subtotal.
What belongs in the taxable amount?
Sales tax generally applies to retail sales of tangible goods unless an exemption applies. Many food products for home consumption and prescription medicines qualify for exemptions, but “all groceries are tax-free” is too broad. Prepared-food rules can differ.
For a mixed basket, separate taxable and exempt purchases before using the tool. If taxable goods cost $120 and exempt goods cost $40, enter $120 in Add sales tax mode. Add the exempt $40 separately when checking the complete checkout amount.
Do not automatically deduct every coupon, rebate or shipping charge. Their tax treatment depends on the transaction. Enter the taxable selling amount after determining which adjustments actually apply; the calculator does not classify them for you.
Sales tax is also different from income tax. The California Income Tax Rate guide concerns tax on income, not the percentage charged on a taxable purchase.
Frequently asked questions
Q1: Does an online purchase escape California tax?
A: Not necessarily. Use tax may apply to a taxable purchase used in California when the seller did not collect the required tax. The calculator can multiply a taxable amount by the applicable rate, but it does not determine filing obligations, credits or penalties.
Q2: Can I use this for a vehicle purchase?
A: Use the California Car Tax Calculator for the vehicle-specific calculation. Do not assume a dealer’s location determines every applicable charge, or that this simple tool includes registration and other vehicle fees.
Q3: Does this calculate all taxes my business owes?
A: No. This is a single-rate transaction calculation, not a sales tax return or business liability calculation. The California Business Tax Calculator addresses a separate business-tax task. Permit requirements and filing schedules need their own review.
Q4: Is sales tax calculated like property tax?
A: No. Sales tax uses a taxable transaction amount. How Are Property Taxes Calculated in California explains the separate property-tax calculation; do not substitute a home’s assessed value into this purchase calculator.
Q5: What should I check when a receipt does not match?
A: Compare the taxable subtotal, combined rate, transaction date and rounding first. Check for exempt items and separately charged fees. If the discrepancy remains, ask the retailer to explain the calculation before assuming the difference is an overcharge.