Calculators by Symmetry
Calculators by Symmetry are custom paycheck calculators for any gross-to-net calculation need. Intelligent, user-friendly solutions to the never-ending realm of “what-if” scenarios.
The payroll tax modeling calculators, powered by the Symmetry Tax Engine, include federal, state, and local taxes, and benefits and other deductions, and integrate directly into your website or application via an API or widgets.
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How it works
The full set of paycheck calculators.
Reliable data makes Calculators by Symmetry an indispensable tool, and with over 11 variations of calculators, tax clarity and client satisfaction evolve naturally.
This product’s excellence is defined at the apex of user friendliness and relevant data. Based on user input, Symmetry utilizes geocoding technology to determine the applicable taxation for each individual calculation, providing relevant and timely results.Request a demo today to see if the calculators are the right fit for you.
Salary Paycheck Calculator
Calculates net pay or take-home pay by entering a per-period or annual salary along with the pertinent federal, state, and local W-4 information. Try the Salary Calculator for Free.
Hourly Paycheck Calculator
Calculates take-home pay based on up to six different hourly pay rates entered along with the pertinent federal, state, and local W-4 information.
Gross-up Calculator
Grosses up wages based on net pay. It determines the amount of gross wages before taxes and deductions that are withheld, given a specific take-home pay amount.
Flat Bonus Calculator
Calculates withholding on special wage payments such as bonuses by using supplemental tax rates. If your state does not have a special supplemental rate, a message will be returned. State-by state compliant for those states that allow the percent method of bonus calculations. The following states do not support this type of calculation: AZ, CT, DE, HI, KY, LA, MA, MS, NJ, UT, WY, DC, PR.
Aggregate Bonus Calculator
Uses employee’s last paycheck amount to apply the correct withholding rates to special wage payments, such as bonuses. This calculator is state-by-state compliant for those states that allow the aggregate method of bonus calculations.
401k Planner
Shows how increasing contributions to a 401(k) affects employees’ paychecks and retirement savings.
403b Planner
Shows how increasing contributions to a 403(b) affects employees’ paychecks and retirement savings.
Final Pay/Termination Calculator
Determines the final payout amount based on current and prior pay period information for employee termination.
Stock Options Calculator
Determines the net gain or loss from selling stock and any subsequent taxes owed.
Tuition Calculator
Allows a tuition amount to be added to a paycheck calculation to compute taxes.
Tax Tip Calculator
Allows a tax amount to be added to the gross pay to compute taxes on tips plus regular wages.
Interested in multi-state gross-to-net calculations?
Check out the Symmetry Tax Engine.
Over 20 million paycheck calculations in 2023.
Try Salary CalculatorRequest a demo
Features
Advantages of integrating a payroll tax modeling calculator.
Complete customization.
Change the background color, font color, style, or pre‑set values in the widgets or use the API to build a unique interface. A wide variety of options are available for customization depending on your audience. See a sample of the Salary Calculator for free.
"style": { "labels": { "font-family" : "Helvetica, Arial, sans-serif", "font-size" : "14px", "color" : "#333" }, "headings": { "font-family" : "Helvetica, Arial, sans-serif", "font-size" : "14px", "color" : "#777" },jsonCallback({ "model": { "grossPay": "77777", "grossPayType": "ANNUALLY", "grossPayYTD": "10000", "payFrequency": "SEMI_MONTHLY", "w42020": true, "federalFilingStatusType2020": "MARRIED", "twoJobs2020": false, "dependents2020": "0", "otherIncome2020": "0", "deductions2020": "0" "additionalFederalWithholding": "100", "roundFederalWithholding": true, "exemptFederal": false, "exemptFica": false, "exemptMedicare": false, "state": "IN", "voluntaryDeductions[0][deductionAmount]": "5" },});Flexible functionality.
JSON technology can be used to pre-populate employee data in the calculator fields or modify the calculator relative to your company’s voluntary deductions or other income items. Deductions such as medical insurance and retirement plans can also be created to mirror those items on an employee’s paystub.
Expand engagement.
Add a calculator to your website and drive traffic and repeat visitors while also improving your site’s SEO. Enhance an Employee Self-Service portal and reduce calls to your payroll department. Create as many unique or complex paycheck modeling scenarios as needed.
Clients
Who will love it?
- Product managers developing complex and unique tax calculations.
- Payroll providers looking to enhance their online resources.
- Payroll managers fielding complex tax modeling questions from employees.
- Entrepreneurs and software developers building applications to solve new complex payroll scenarios such as paying gig economy workers.
"The biggest challenge we faced as an organization was how do we build and maintain a payroll calc engine that supported federal, state, and local calculations at a price point that was both effective and efficient for our business."
Product Management
Technical Info
The API vs. Widgets.
There are two methods of integration that differentiate this technology - the embeddable widgets and the application programming interface (API).
With a sleek, customizable interface that is lightweight and loads quickly, your employees can access the calculators on any device, and they’ll look and perform great.
- API100% statelessThe API is stateless, you can build an entire interface around it and make the calculators fit specific needs. Data is returned in JSON.Learn how
API
Build your own interface and call the Calculators by Symmetry API for the paycheck calculations. Quick to implement, the API gives you the most flexibility to design your own payroll calculators.
How API works:
- Choose what results to show. Certain values such HSA deduction, 401(k), etc. can be displayed or not.
- Generate predefined reports in the form of a byte array.
- All API access is over HTTPS, with all data sent and received as JSON.
See developer docs to get more information on the API.
{ "content": "Calculators", "_links": { "self": { "href": "http://calculators.symmetry.com/api/calculators", }, "salary": { "href": "http://calculators.symmetry.com/api/calculators/salary", }, "hourly": { "href": "http://calculators.symmetry.com/api/calculators/hourly", }, "grossup": { "href": "http://calculators.symmetry.com/api/calculators/grossup", }, "bonus-percent": { "href": "http://calculators.symmetry.com/api/calculators/flatbonus", }, }}Widgets
Copy and paste a one-line script tag into your HTML for out-of-the-box paycheck calculators. Great for quick implementation if you like the way our calculators look.
How Widgets work:
- Responsive widgets adjust to the size of your application and window.
- Pre-set default values in the calculator form fields inline via JSON, an external URL, or through the Calculators by Symmetry admin console.
- Customize color, style, and font.
See developer docs to get more information on the widgets or contact Symmetry to receive a key to activate the widgets.
| Name | Script |
|---|---|
| Salary | <script async src="https://calculators.symmetry.com/widget/js/salary.js?key=yourKey"></script> |
| Hourly | <script async src="https://calculators.symmetry.com/widget/js/hourly.js?key=yourKey"></script> |
| Gross-up | <script async src="https://calculators.symmetry.com/widget/js/grossup.js?key=yourKey"></script> |
| Flat bonus | <script async src="https://calculators.symmetry.com/widget/js/flatbonus.js?key=yourKey"></script> |
I was able to self-serve using the Technical Documentation and Release Documentation and received confirmation from a member of the support team. Thank you for your
great support.
Leonardo Hinojosa, Information Technology
FAQCalculators by Symmetry common questions.
Try our contact form if you don't find your question answered here.
How often are the Paycheck Calculators updated?
The calculators are updated monthly to ensure you get the most current withholding computations, with interim releases during parts of the year when taxes change more frequently.
How accurate are the Paycheck Calculators?
As the creators of the first online paycheck calculator, we are not satisfied until accuracy is verified to the penny. As such, all calculations are tested exhaustively by our engineers before release. Because payroll systems use different methods to calculate withholding, an answer within 1-5 cents is considered acceptable based on a single work location. For multi-state scenarios, see the Symmetry Tax Engine.
Are the Paycheck Calculators suitable for payroll or tax websites?
Yes. Many service providers (payroll firms, PEOs, staffing companies) use the calculators on their websites. Calculators enrich site content, increase traffic, and are sticky for visitors.
Where can I see more examples of Calculators by Symmetry paycheck calculators?
Symmetry Software has a library of calculator examples available to prospective clients who take the calculators for a spin with our trial. Contact us to get started or for full documentation, read our Calculators by Symmetry developer docs.
Get started.
Looking for more?
- Payroll Tax EngineSymmetry Tax Engine is a payroll processing and tax calculator to build or enhance a payroll platform, embed payroll into an existing application, and increase compliance.U.S. and CanadaLearn more about Symmetry Tax Engine
- Local Tax FinderSymmetry Payroll Point determines complicated local withholding tax and wage rates within your product by applying latitude and longitude coordinates of a residential address and a work address.Learn more about Symmetry Payroll Point
- Online Withholding FormsSymmetry Payroll Forms directly integrates and automates the withholding forms process at the federal, state, and local levels with over 125 compliant forms.U.S. and CanadaLearn more about Symmetry Payroll Forms
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