10 Top Taxes APIs

Tax codes can be a tricky area to navigate. Luckily, plenty of technology firms have stepped up to provide tools to determine tax rates and keep abreast of current tax laws.

Any reputable provider of goods and services would want to make sure they are abiding by tax rules and determining the correct tax amounts for whatever it is they sell. Developers wishing to create applications for such organizations can use APIs to complete the task.

What is a Taxes API?

A Taxes API is an Application Programming Interface that enables developers to integrate applications with tax services.

Developers wishing to locate suitable Taxes APIs can check out the Taxes category on ProgrammableWeb. There, dozens of choices are listed including sales tax, income tax, payroll tax, property tax, tariff, value added tax, taxes for many countries and more.

In this article, we highlight ten favorite Taxes APIs as determined by webpage traffic on ProgrammableWeb.


A value added tax (VAT) identification number is an identifier used in many countries, including the countries of the European Union, for value added tax purposes. The VIES VAT APITrack this API allows users to verify the validity of a VAT identification number issued by any Member State of the European Union.

2. Thomson Reuters ONESOURCE Calendar API

Thomson Reuters is a global provider of news and information based tools. ONESOURCE is Thomson Reuter's corporate tax technology Platform. Thomas Reuters ONESOURCE Calendar APITrack this API automates the process of monitoring and tracking tax-related activities and due dates, enabling clients with the ability to automate tax obligation and calculation due dates on tax returns. The provider actively searches, maintains, and updates a content Library for tax requirement dates and other statutory obligations and is a global provider of answers that help professionals make decisions about businesses. This includes help with legal, tax, compliance and more.

3. India Goods and Service Tax (GST) API

The India Goods and Service Tax (GST) APITrack this API is a RESTful API providing services for all taxpayer related functionalities. This includes such services as Information on Payment, Filling of Returns, Registration, Ledger Viewing, and more. Using the GST Developer Portal, content is provided to help application developers to understand, use, and consume GST APIs in their applications.

4. Precisely Local Tax API

Precisely is a data integrity platform capable of collecting, verifying, and mapping information. The Precisely Local Tax APITrack this API returns tax rates associated with an address or location coordinates. This platform can be used to enable address typeahead capabilities in eCommerce websites, determine origin and delivery destinations in logistics applications, and provide better insights for customer engagement. Precisely APIs feature REST architecture, API Key Authentication, and JSON responses.

5. MicroBilt Payroll Verification Service API

MicroBilt Payroll Verification Service APITrack this API provides a way to verify payroll tax filings and payroll register information for businesses. It delivers payroll verification of various IRS forms, payroll registers, CARES Act, PPP generated Documentation and more. The Paycheck Protection Program (PPP) is an SBA loan that helps businesses keep their workforce employed during the COVID-19 crisis.

6. RetroTax API

RetroTax offers tools that help in managing federal and state tax credit and incentive programs for businesses. The RetroTax APITrack this API enables developers to programmatically access application statuses, company data, reports, and employee information. RetroTax supports the Work Opportunity Tax Credit (WOTC), Federal Empowerment Zone (FEZ) Wage Credit, R&D credits, 179d Deductions, and others.

Retrotax API

Image: RetroTax

7. KnowYourGST GST Number Verify or Search API

KnowYourGST GST Number Verify or Search APITrack this API helps users to integrate Canada's GST number verification facility into applications. Enable applications to search GST numbers, verify GST number and get address of tax payers with help of GST Public API. GST stands for the Goods and Services Tax Identification Number used in Canada.

8. Paylocity API

Paylocity is payroll software designed for the mid-market. Paylocity Web Services APITrack this API is a RESTful API for integrating with the platform and includes methods for earnings, deduction, employees, local taxes, and more.

9. Dinero API

Dinero is an accounting platform for businesses. The Dinero APITrack this API allows Integration of the platform and programmatic control including tax computation, billing, and cloud sharing for documents. The firm is from Denmark and the website is in Danish.

10. Canadian Sales Tax API

Canadian Sales Tax APITrack this API allows developers to integrate sales tax information with their applications by using the postal abbreviations of Canada. Methods are available to get the current GST (global sales tax), get the current HST (harmonized sales tax) for a province or all provinces, get the current GST for a province, get the current PST (provincial sales tax) for all provinces, get the total applicable tax for a province, and get the total applicable tax for all provinces.

Be sure to check out the Taxes category for more than 70 APIs, 50 SDKs, and Source Code Samples.

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