Best Open Source Payroll Software for Small Business (2026): 4 Tools Compared

Payroll is the hardest area for open source. Payroll rules are specific to each country and change every year, so there are few complete free products. This guide shows what exists, what it really covers, and when you should use a payroll service instead.

We write for small businesses, freelancers and growing teams, not large enterprises. Every tool below was checked on GitHub for license, archive status and recent activity, and prices are never quoted because they change. Our picks are based on each project's documentation and repository data, not on hands-on benchmarks, so always try a tool with sample data first. This is general information, not tax, legal or accounting advice.

Top picks at a glance

• Frappe HR (HRMS): HR and payroll for ERPNext users.
• OCA Payroll for Odoo: Payroll for Odoo Community users.
• Payroll Engine: Developers building country-specific payroll.

What to look for in payroll software for a small business

• Local statutory rules. Taxes, social contributions and filings are country-specific. Confirm that you can configure them correctly or that a localization exists.
• Salary structures. You need earnings, deductions, tax slabs and employer contributions you can edit.
• Payslips and reports. Check payslip generation and the reports your regulator or accountant needs.
• Integration with accounting. Payroll entries should flow into your books without manual re-typing.
• Project health and license. Choose a project that is not archived, has recent releases and a real open source license. Check the LICENSE file, not just the website.

Comparison table: best open source payroll software

Stars and update dates are a snapshot from 16 October 2026 and change daily. They show activity, not quality.

The 4 best open source payroll tools, reviewed

1. Frappe HR (HRMS)

Best for: HR and payroll for ERPNext users
License: GPL-3.0 · Stack: Python (Frappe) · GitHub: 8,929 stars, repo updated Oct 2026

Frappe HR is an open source HR and payroll application that works with ERPNext. The strongest all-round free option, though you configure salary structures and local rules yourself.

Source on GitHub · Official website

2. OCA Payroll for Odoo

Best for: Payroll for Odoo Community users
License: AGPL-3.0 · Stack: Python (Odoo modules) · GitHub: 124 stars, repo updated Oct 2026

Community-maintained Odoo modules for payroll management. Useful if you already run Odoo Community, but you must adapt them to your country.

Source on GitHub

3. Payroll Engine

Best for: Developers building country-specific payroll
License: MIT · Stack: C# / .NET framework · GitHub: 132 stars, repo updated Oct 2026

An MIT-licensed, regulation-driven payroll framework for developers. It is a toolkit, not a ready-to-use product for a small office.

Source on GitHub · Official website

4. ERPNext

Best for: Accounting side of payroll
License: GPL-3.0 · Stack: Python (Frappe), MariaDB · GitHub: 40,232 stars, repo updated Oct 2026

ERPNext posts payroll expenses to accounting once HR and payroll are set up with Frappe HR.

Read our full guide to ERPNext · Source on GitHub · Official website

Open source vs paid payroll software

Paid cloud products usually win on polish, mobile apps, automatic bank connections and support. Open source wins on running cost as you grow, data ownership and the freedom to customize. The real cost of open source is hosting, backups, updates and your own time, so count those honestly. Several of these projects also sell hosting or support if you would rather not run a server yourself.

How to choose the best payroll software

• You already use ERPNext: Frappe HR.
• You already use Odoo Community: OCA Payroll modules, with local adaptation.
• You have developers and unusual rules: Payroll Engine.
• You have fewer than a handful of employees and strict compliance needs: A paid payroll service or your accountant.

Popular tools that are not open source (or not maintained)

These names show up in many "open source" lists, so check the license before you choose them:

• IceHrm: Licensed under the Elastic License 2.0, which is not an open source license. Repository

Checked from the projects' LICENSE files and GitHub status on 16 October 2026. Licenses can change.

Mistakes to avoid

Payroll mistakes cost real money and can create legal problems. Open source gives you a framework, not guaranteed compliance. IceHrm is not open source (Elastic License 2.0). For small teams, an accountant or a local payroll provider is often the safer and cheaper choice.

Where to host it

All of these tools can be self-hosted. A small VPS or a web hosting plan from a provider such as Hostinger is enough to get started with most of them. Check each project's requirements first, and read our security and backup checklist before you add real data.

Related comparisons

• Best Open Source ERP Software for Small Business
• Best Open Source Expense Tracking Software (2026)
• Best Open Source Accounting Software for Small Business
• Best Open Source Time Tracking Software for Small Business

All open source business software comparisons

• Accounting
• Bookkeeping
• Billing
• Invoicing
• Payroll
• Inventory Management
• Warehouse Management
• Expense Tracking
• Spend Management
• Accounts Payable
• Accounts Receivable
• Cash Flow Management
• Bank Reconciliation
• Purchase Order
• Vendor Management
• Point of Sale (POS)
• Time Tracking
• Quotation & Estimates
• Revenue Recognition
• Financial Reporting
• Asset Management
• Lead Management
• Sales Pipeline
• ERP

Also see our directory of 50 open source CRMs.