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Sales Tax Calculator: Add Tax, Remove Tax, or Apply Discount Then Tax

All 50 US states pre-loaded. Three modes: calculate the total with tax, reverse-engineer the pre-tax price from a receipt, or chain a discount plus tax in one step. Instant results with a PDF report.

All 50 States Pre-Loaded 3 Calculation Modes Discount Plus Tax Mode Branded PDF Report WhatsApp Share Big.js Precision
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Sales Tax Calculator

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Combined state + local rate for your area

Sales Tax Results

$0.00 Total With Tax
$0.00 Pre-Tax Price
$0.00 Tax Amount
0% Tax Rate Applied

Step-by-Step Formula

US Sales Tax: What It Is and Why It Differs by State and City

Sales tax in the United States is a consumption tax levied by state and local governments on the purchase of goods and, in some cases, services. Unlike the value-added taxes used in most other countries, which are embedded in the price at each stage of production, US sales tax is applied once at the point of final sale to the consumer. The buyer pays it on top of the listed price, and the retailer collects it and remits it to the appropriate tax authority.

What makes US sales tax uniquely complex is that it operates on at least three simultaneous layers: the state, the county, and the city. The rate you pay at a specific address can involve a base state rate, a county rate on top of that, and a city or special district surcharge on top of both. This stacking system produces significant variation not just between states but within them.

The Rates That Actually Affect What You Pay

Here is a representative sample of combined state plus average local rates across the US, showing the range that Americans encounter:

StateCombined RateStateCombined Rate
Louisiana9.56%Oregon0.00%
Tennessee9.55%Montana0.00%
Arkansas9.47%New Hampshire0.00%
Washington9.29%Delaware0.00%
Alabama9.25%Wisconsin5.43%
Oklahoma8.95%Wyoming5.36%
Illinois8.85%Virginia5.75%
California8.82%Maine5.50%
New York8.52%Hawaii4.44%
Texas8.20%Alaska1.76%

Alaska deserves a special note. While the state itself charges no statewide sales tax, local municipalities in Alaska may impose their own rates. The 1.76% figure represents the average local rate across Alaska, but specific boroughs and cities vary widely. A shopper in Juneau pays a different rate than one in Anchorage.

Why the State Average Does Not Tell the Whole Story

The rates in this calculator’s dropdown represent statewide averages combining the state rate with a weighted average of local rates. Your specific city or county may differ from this average by one to two percentage points. For example, Illinois averages 8.85%, but Chicago proper reaches 10.25% or higher in certain city districts when state, county, and city layers combine. For precise calculations at a specific address, use your state department of revenue’s address-based rate lookup tool and then enter that exact rate in the custom field of this calculator.

45 US states plus Washington DC that collect a statewide sales tax
5 States with zero statewide sales tax: OR, MT, NH, DE, and AK
10,000+ Distinct sales tax jurisdictions across the United States

The 2018 Wayfair Ruling and Online Sales Tax

Before 2018, many Americans assumed online purchases were tax-free. The Supreme Court’s ruling in South Dakota v. Wayfair, Inc. ended that era. The Court held that states may require out-of-state sellers to collect and remit sales tax based on economic nexus, meaning a certain volume of sales into the state, even without a physical presence there. By 2020, virtually all sales-tax states had enacted economic nexus laws. If you buy from Amazon, Walmart.com, Target.com, or any major e-commerce retailer, sales tax is collected at the rate for your delivery address. The rules are the same whether you walk into a store or click Buy Now.

Economic nexus thresholds typically start at $100,000 in annual sales or 200 transactions in a state, though these vary. Smaller online sellers who have not historically collected out-of-state sales tax may now be required to do so if they cross these thresholds. The Streamlined Sales and Use Tax Agreement provides a framework for simplifying multi-state compliance, though not all states participate. For online shoppers, the practical takeaway is simple: expect to pay your local tax rate on virtually any online purchase from an established retailer, just as you would in a brick-and-mortar store.

How Does This Three-Mode Sales Tax Calculator Work?

Most online sales tax calculators solve only one direction: give them a pre-tax price and a rate, and they return a total. This calculator solves all three directions, plus a fourth mode that chains a discount with the tax calculation, in a single tool with automatic state rate lookup.

Mode 1: Add Tax (Standard)

Select your state from the dropdown. The rate field auto-fills with that state’s average combined rate. You can override it with a custom rate for your specific city. Enter the pre-tax price and click Calculate Tax. Results: total with tax, tax amount, pre-tax price, and rate applied. The chart shows all three values side by side.

Mode 2: Remove Tax (Reverse Mode)

Switch to the Remove Tax tab. Select your state (or enter a custom rate), then enter the total you actually paid, including tax, from a receipt or invoice. Click Calculate Tax. The calculator reverse-engineers the pre-tax price and the tax amount that compose your total. This mode is useful for verifying receipts, extracting pre-tax values for expense reports, and checking whether the rate applied to a purchase was correct.

Mode 3: Discount Plus Tax (Unique to This Calculator)

Switch to the Discount + Tax tab. Enter the original price before any discount, the discount percentage, and your tax rate. Click Calculate Tax. The calculator applies the discount first to get the sale price, then applies tax to that discounted amount, giving you the true out-of-pocket total in one step. No competitor calculator combines these two calculations in a single mode.

The State Dropdown and Custom Rate Field

All 50 states plus Washington DC are in the dropdown, each pre-labeled with their approximate combined rate. Selecting a state auto-fills the rate field and shows a note identifying the state and confirming the rate used. States with no sales tax show a green “no tax” notice. You can always override the auto-filled rate with any custom value for more precise local calculations.

Three Real Sales Tax Calculations from Across the US

Example 1: New Laptop Purchase in Austin, Texas

Austin, Texas: Mode 1 (Add Tax)

Jordan is buying a laptop for $1,149.00 pre-tax at a computer store in Austin, Texas. The Texas combined state plus local rate in Austin is 8.25%.

Tax amount: $1,149.00 x 0.0825 = $94.79

Total at checkout: $1,149.00 + $94.79 = $1,243.79

Jordan uses the calculator before heading to the store, entering 1149 as the price and 8.25 as the rate. Confirming the $94.79 tax and $1,243.79 total lets him set aside the right amount before purchase, avoiding the surprise that often comes when a mental “roughly $1,150” budget meets an actual $1,243.79 checkout total.

Example 2: Receipt Audit in Chicago, Illinois

Chicago, Illinois: Mode 2 (Remove Tax)

Maya paid $55.17 total for a purchase in Chicago and wants to verify the pre-tax amount for her expense report. Chicago’s combined rate at her location is 10.25%.

Pre-tax calculation: $55.17 / (1 + 0.1025) = $55.17 / 1.1025 = $50.04 pre-tax

Tax amount: $55.17 – $50.04 = $5.13

Maya enters 55.17 as the total and 10.25 as the rate in the Remove Tax tab. The result confirms a $50.04 pre-tax price and $5.13 tax, which she enters into her expense report. The Remove Tax mode also lets her quickly verify that the rate charged was correct: $50.04 x 10.25% = $5.13, matching the receipt.

Example 3: Sale Item Plus Tax in Seattle, Washington

Seattle, Washington: Mode 3 (Discount + Tax)

Carlos finds a rain jacket originally priced at $240.00 at 30% off at a Seattle outdoor retailer. Seattle’s combined sales tax rate is approximately 10.25%.

After 30% discount: $240.00 x 0.70 = $168.00 sale price

Tax on sale price: $168.00 x 0.1025 = $17.22

True out-of-pocket total: $168.00 + $17.22 = $185.22

Carlos uses the Discount + Tax tab, entering 240 as the original price, 30 as the discount percentage, and 10.25 as the rate. The single calculation produces all three figures at once, letting him compare this to a competing offer before deciding. The PDF report gives him a clean record of the calculation to reference later.

Expert Tips: Managing Sales Tax in Your Everyday Purchases

Tip 1: Always Budget With Tax, Not Without

The most common personal finance mistake at checkout is budgeting the listed price rather than the tax-included total. In a high-tax state like Washington, Tennessee, or Louisiana, the gap between the shelf price and your actual payment regularly reaches 9% or more. On a $500 purchase, that is a $45-$50 difference. Before any significant purchase, run this calculator with your state’s rate to know the real number. Keeping a pre-calculated cushion in your mental budget prevents last-minute card declines and over-limit situations at checkout.

Tip 2: Use the Remove Tax Mode to Verify Business Receipts

If you handle expense reports, accounts payable, or small business purchasing, the Remove Tax mode is a daily-use tool. Many receipts do not clearly separate the pre-tax subtotal from the tax line, or they show rounded figures that are hard to reconcile. Enter the receipt total and the applicable rate to extract the exact pre-tax amount. This is essential when recording deductible business expenses, since deductions are based on the pre-tax cost of goods, not the tax-inclusive total. The PDF receipt this calculator generates gives you a clean documentation trail that matches your accounting records.

Tip 3: Know Which Items Are Exempt Before You Shop

Exemptions reduce your tax burden significantly on eligible purchases, but they vary enough by state that you need to look up your state’s specific rules. Unprepared groceries (food you cook at home) are exempt in many states, including Texas, California, and most of the Northeast. Prescription and over-the-counter medications are fully exempt in many states. Children’s clothing is exempt in Pennsylvania and Minnesota. Some states also have tax holidays for school supplies or hurricane preparedness items on specific dates each year. The Tax Foundation’s state sales tax guide is an excellent starting point for checking your state’s exemptions and current rate structure.

Filing, Remitting, and Record-Keeping for Business Owners

If you operate a business that collects sales tax from customers, accurate calculation is only part of the responsibility. You also need to remit collected taxes to the appropriate state authority on time, typically monthly, quarterly, or annually depending on your sales volume. Penalties for late remittance can be significant, and underpayment due to calculation errors creates liability that accumulates with interest.

Small business owners often find the three-mode structure of this calculator useful for their daily operations. The Add Tax mode helps price products correctly for customer-facing quotes and invoices. The Remove Tax mode helps reconcile daily receipts when a point-of-sale system reports tax-inclusive totals. The Discount + Tax mode handles the common scenario of pricing promotions or wholesale discounts where tax must still be collected on the post-discount amount.

For businesses operating across multiple states, each state has its own filing schedule, exemption certificate requirements, and special product taxability rules. Resources from the IRS Small Business Tax Center and the Streamlined Sales Tax Governing Board can help multi-state sellers understand their obligations. The rates in this calculator offer a fast, accurate starting point for estimating tax obligations, but consult your state’s department of revenue for exact filing requirements.

Frequently Asked Questions About US Sales Tax

Multiply the pre-tax price by the tax rate divided by 100. Tax Amount = Price x (Rate / 100). Add the result to the price for the total: Total = Price + Tax. Example: $80 at 8.25%: $80 x 0.0825 = $6.60 tax, total = $86.60. Use this calculator’s Add Tax mode to handle any price and any rate with Big.js precision and an instant PDF receipt.
Divide the total by (1 + Tax Rate / 100). Pre-Tax = Total / (1 + Rate / 100). Example: $86.60 total at 8.25%: $86.60 / 1.0825 = $80.00 pre-tax, $6.60 tax. Use the Remove Tax tab to do this automatically for any US state.
Five states have no statewide sales tax: Oregon, Montana, New Hampshire, Delaware, and Alaska. Alaska allows local municipalities to impose their own sales taxes, so some Alaskan cities do charge a local rate. The other four states have no sales tax at any level on most goods. All five appear in this calculator’s dropdown with a 0% rate noted.
On a statewide average basis, Louisiana (9.56%) and Tennessee (9.55%) are the highest. However, specific city and county combinations can push combined rates higher. Parts of Chicago reach 10.25% or beyond. Some Louisiana parishes and Alabama cities have local rates that push combined totals to 11% or higher at specific locations. This calculator uses statewide averages; enter a custom rate for location-specific calculations.
In virtually all US states, sales tax applies to the final sale price after any retailer discount is applied, not the original price. A $100 item with 20% off becomes $80 for tax purposes, so you pay tax on $80, not $100. Use the Discount + Tax mode in this calculator to chain both steps automatically and see the true out-of-pocket total in one calculation.
Texas’s state rate is 6.25%. Most Texas cities and counties add up to 2% locally, making the maximum combined rate 8.25%. Houston, Dallas, Austin, San Antonio, and Fort Worth all charge 8.25% combined. Select Texas from the dropdown (the pre-loaded rate is 8.20% as a statewide average) and override with 8.25 for major Texas cities.
California’s base rate is 7.25%. Districts add their own surcharges, ranging from near the base in rural areas to 10.75% in some city districts. Los Angeles city is typically 10.25%. San Francisco is 8.625%. The statewide average of 8.82% is pre-loaded in this calculator. For a specific California address, check the California Department of Tax and Fee Administration’s rate lookup tool and enter that precise rate.
Yes, in most cases. After the Supreme Court’s 2018 South Dakota v. Wayfair ruling, states can require online retailers to collect sales tax based on economic activity in the state, without any physical presence. Major retailers including Amazon, Walmart, Target, and most large e-commerce platforms now collect sales tax in all states that have one. Tax is calculated at the rate for your delivery address.
Common exemptions include: unprepared grocery food (exempt in many states), prescription medications (exempt in most states), residential utility services in some states, farm equipment and agricultural supplies, and manufacturing machinery. Clothing is exempt in Pennsylvania, New York City (for items under $110 per item), Minnesota, and New Jersey. Services are taxable in some states and exempt in others. Exemptions vary significantly; check your state’s department of revenue for a current exemption list.
The pre-loaded rates represent approximate combined state plus average local rates based on Tax Foundation data. They are accurate for general budget planning and quick calculations. For precise rates at a specific address, use your state department of revenue’s address-based lookup and enter that rate in the custom field. Rates also change periodically through legislative updates, so verify current rates for high-value or business-critical calculations.
The state sales tax rate is set uniformly by the state legislature and applies everywhere in the state. Local sales taxes are added by cities, counties, and special taxing districts on top of the state base. The combined rate is the sum of all layers applying at your specific location. Illinois charges 6.25% statewide, but Chicago piles on Cook County tax and a city tax, resulting in a combined rate above 10% in the city proper.
Apply the discount first to get the sale price, then apply tax to the discounted amount. Example: $200 item at 25% off is $150. Tax at 8.25% on $150 is $12.38. Total is $162.38. Use the Discount + Tax tab to do both steps automatically: enter the original price, the discount percentage, and your tax rate. The calculator chains the math in the correct order and shows the sale price, tax, and final total in one result.
Multiplying by a factor like 1.0825 is a quick shortcut but this calculator uses Big.js, which eliminates floating-point errors that standard JavaScript produces at certain decimal values. It also goes far beyond a simple multiplier: three calculation directions, auto-filled state rates for all 50 states, the Discount + Tax chained mode, PDF report generation, and WhatsApp sharing. The calculator handles all the math you need at a checkout, not just one direction.
Pre-Tax Price = Total Paid / (1 + Tax Rate / 100). Tax Amount = Total Paid – Pre-Tax Price. Example: $107.50 total at 7.5% tax: Pre-Tax = $107.50 / 1.075 = $100.00. Tax = $107.50 – $100.00 = $7.50. Use the Remove Tax tab in this calculator to perform this instantly for any state with a single click.
Yes. The Remove Tax mode is particularly useful for expense reporting because it separates the tax amount from the pre-tax cost on any receipt. Business travel, equipment, and supply purchases often need to be recorded at pre-tax cost with tax listed separately for accounting and deduction purposes. The PDF report this calculator generates provides a clean, printable record that documents the calculation with the date, rate, pre-tax price, tax amount, and total paid.
Four common causes: (1) your specific city or district has a different rate than the state average pre-loaded in the dropdown, (2) some items in your purchase are tax-exempt (groceries, medications), (3) the retailer applies tax at the line-item level with individual rounding, which can differ slightly from applying tax to the cart total, or (4) there is a surcharge or fee on your receipt that is not a sales tax but adds to the total. Use the custom rate field to enter your exact local rate, and compare line by line if the totals do not match.
The three-bar chart displays your pre-tax price (navy), tax amount (red), and total paid (green) as separate bars on the same dollar scale. This makes the proportion of tax to purchase price visually clear. A 10% tax on a $100 item shows a small red bar next to a larger navy one. Seeing these figures as proportional bars is especially useful when comparing the tax burden across different states or purchase amounts.
After calculating, two buttons appear below the inputs. Download PDF Report generates a branded receipt-style document with all four key figures (pre-tax price, tax amount, total, and rate applied), plus the step-by-step formula and a generation date. It is printable and suitable for expense documentation. Share on WhatsApp composes a pre-formatted message with your key results and a link to this calculator, ready to send to anyone who needs the numbers.

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Legal Disclaimer and Editorial Transparency

The Sales Tax Calculator on USCalculators.com is provided for educational and informational purposes only. All calculations use Big.js precision arithmetic. Pre-loaded state rates represent approximate combined state plus average local rates and may not reflect the exact rate applicable to your specific address, purchase type, or date of purchase.

Sales tax rates change through legislation and local government decisions. For the exact rate applicable to a specific address and purchase, consult your state’s department of revenue. Official guidance is available from the IRS for federal tax treatment of sales taxes, and from your specific state’s revenue authority for current local rates and exemptions. This tool does not constitute tax advice. Consult a qualified tax professional for tax planning decisions.

USCalculators.com does not accept payment to promote any product, service, or jurisdiction. State rate data is sourced from publicly available Tax Foundation research. This content was written by the USCalculators.com editorial team to help American consumers and business owners manage everyday purchasing math with confidence.