How do I integrate with United States accounting software?

Apideck's Unified Accounting API lets you integrate with 18+ United States accounting platforms through a single API. Sign up, enable the connectors you need, and use one standardized data model to read and write invoices, payments, contacts, and more.

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United States accounting integrations

Q: What accounting software is popular in United States?

The most popular accounting platforms in United States include QuickBooks, NetSuite, Sage Intacct, FreshBooks, Xero. QuickBooks Online leads US small business accounting, with QuickBooks Desktop still used by a large installed base. NetSuite and Sage Intacct lead the mid-market, Xero is the fastest-growing challenger, and Oracle Fusion Cloud serves larger enterprises. There is no federal e-invoicing mandate, but 1099 information returns and state-by-state sales tax nexus rules apply.

QuickBooks Online leads US small business accounting, with QuickBooks Desktop still used by a large installed base. NetSuite and Sage Intacct lead the mid-market, Xero is the fastest-growing challenger, and Oracle Fusion Cloud serves larger enterprises. There is no federal e-invoicing mandate, but 1099 information returns and state-by-state sales tax nexus rules apply.

18 supported accounting platforms + 18 on the radar

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United States accounting software market

Where the major platforms sit and which Apideck supports today. Figures are company-reported unless marked as an estimate.

36.2 million

small businesses in the US

SBA Office of Advocacy, 2025 Small Business Profile

8.9 million

Intuit Online Ecosystem paying customers worldwide (FY2026)

Intuit Q4 and Full-Year Fiscal 2026 Results

Platform	United States market position	Apideck	Source
QuickBooks Online	Market-leading US small business accounting platform; Intuit reported 8.9 million total online paying customers worldwide at fiscal year end 2026, with US QBO customers (excluding self-employed) up 6% year over year	Supported	Intuit Q4 FY2026 earnings release, Aug 25 2026
QuickBooks Desktop	Legacy desktop product still used by a large installed base of US small businesses even as Intuit shifts investment to QuickBooks Online	Supported	QuickBooks Cloud Accounting Statistics Roundup, Apps4Rent, 2026
NetSuite	Oracle-owned cloud ERP; Oracle states NetSuite serves more than 41,000 organizations worldwide, a large share of them US mid-market companies	Supported	Oracle NetSuite company information
Sage Intacct	Cloud financial management platform for mid-market and multi-entity US businesses; parent Sage Group reported continued double-digit growth for Intacct in its FY2025 results	Supported	Sage Group Full Year 2025 Results, Nov 19 2025
Xero	Smaller US footprint than QuickBooks but the fastest-growing challenger; Xero added 110,000 new US customers in FY2026 and topped 4.92 million subscribers globally	Supported	Xero FY26 Annual Results Investor Presentation, ASX, May 14 2026
FreshBooks	Niche player for freelancers and service-based small businesses; the company states more than 30 million people worldwide have used the platform	Supported	FreshBooks Statistics roundup, 2026
Wave	Free accounting software aimed at solo entrepreneurs and micro-businesses, owned by H&R Block since 2019	Supported	Wave Financial company profile
Zoho Books	Part of the broader Zoho suite, which the company states serves over 100 million users worldwide across its products	Supported	Zoho company information
Oracle Fusion Cloud	Upmarket ERP alternative to NetSuite aimed at larger US enterprises	Supported	Oracle Fusion Cloud ERP overview

Subscriber and customer counts are the best available public indicators and may include accountant-managed multi-entity accounts; they are not a direct count of distinct businesses. Estimates are marked accordingly.

United States accounting compliance requirements

The United States has no federal e-invoicing mandate, but businesses must file 1099 information returns with the IRS to report payments to contractors and vendors, navigate state-by-state sales tax economic nexus rules that have applied since the 2018 Wayfair Supreme Court ruling, and prepare financial statements under GAAP.

1099 information returns

Businesses that pay contractors or vendors above IRS thresholds must file Form 1099 information returns and furnish copies to recipients each year.

IRS

Mandatory e-filing for information returns

Businesses filing 10 or more information returns in a calendar year, including 1099s and W-2s, must file them electronically with the IRS.

IRS Information Return Reporting

State sales tax economic nexus

Since the Supreme Court ruling in South Dakota v. Wayfair in 2018, states can require businesses to collect sales tax once they cross a state-specific revenue or transaction threshold even without physical presence.

Oyez / Supreme Court case archive

GAAP financial reporting

US companies prepare financial statements under Generally Accepted Accounting Principles set by the Financial Accounting Standards Board.

FASB

Supported accounting platforms

Connect to these United States accounting systems through one unified API

View Accounting API

QuickBooks

United States accounting integrations

United States accounting software market

United States accounting compliance requirements

1099 information returns

Mandatory e-filing for information returns

State sales tax economic nexus

GAAP financial reporting

Supported accounting platforms

On the radar

Beyond accounting

CRM

HRIS

ATS

Ecommerce

File Storage

Issue Tracking

Accounting coverage by country

North America

Europe

Asia Pacific

Africa

Middle East

Latin America

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