Easily embed or integrate custom paycheck calculators for any payroll scenario
Calculators by Symmetry are custom paycheck calculators for any gross-to-net calculation need. Easily integrate “what-if scenarios” and payroll tax modeling into your payroll product, employer portal or public website, via an API or embeddable widgets.
The payroll tax modeling calculators, powered by the Symmetry Tax Engine®, include federal, state, and local taxes, and benefits and other deductions.
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.
Over 20 million paycheck calculations each year. 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.
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. Free demo
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.
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.
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"
},"calculation": {
"grossPay": "14350",
"grossPayType": "ANNUALLY",
"grossPayYTD": "85260",
"payFrequency": "SEMI_MONTHLY",
"w42020": true,
"federalFilingStatusType": "MARRIED",
"twoJobs": false,
"dependents": "0",
"otherIncome": "0",
"deductions": "0"
"additionalFederalWithholding": "310",
"roundFederalWithholding": true,
"exemptFederal": false,
"exemptFica": false,
"exemptMedicare": false,
"state": "CA",
"voluntaryDeductions[0][deductionAmount]": "87",
...
}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.
Who will love it?
Product Management at a leading information technology company"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."
"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."
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.
API integration
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.
{
"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!
Review widget developer docs and contact Symmetry to receive a key to activate the widgets.
| Calculator | 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> |
FAQ
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Looking for more?
Payroll Tax Engine
Calculate gross-to-net payroll taxes to build or enhance a payroll product, embed payroll into an existing application, and increase compliance.
Online Withholding Forms
Directly integrates and automates the withholding forms process at the federal, state, and local levels with over 130 compliant forms.
Local Tax Finder
Determines complicated local withholding tax rates within your product by applying latitude and longitude coordinates of a residential address and a work address against Symmetry’s expansive library tax shapefiles, nexus and reciprocity algorithm.