Top 10 Best Self Hosted Invoice Software of 2026

Bigcapital covers the core accounts receivable workflow with invoice numbering sequences, tax rate configuration, and document variations like pro forma and credit notes. A template-driven invoice renderer helps standardize layout and totals without editing documents by hand. The automation surface relies on webhook events and API endpoints that carry invoice state changes for downstream processes.

A key tradeoff is that payment collection depends on external steps rather than acting as a full payment gateway replacement, so reconciliation often stays in the accounting or finance stack. Bigcapital fits teams that want to keep invoice generation internal and still automate reminders, status updates, and downstream posting through API and webhooks.

SolidInvoice targets environments where invoice generation must run inside a private deployment model and where consistent invoice numbering is governed by the organization. Core workflows include drafting invoices, issuing PDF documents, managing recurring schedules, and attaching credit or debit notes to correct prior statements. Tax rules and customer tax identifiers can be configured so tax amounts are calculated consistently across templates and payment reminders.

A key tradeoff is that deeper integrations require active API and webhook wiring by the implementing team rather than a prebuilt accounting connector for every system. SolidInvoice fits well when teams need a controlled accounts receivable workflow and want to connect invoice events to their own ERP or reconciliation process with explicit field mapping.

Kill Bill provides a billing domain model centered on subscriptions, invoices, and adjustments, which keeps invoicing tied to account state and plan changes. Invoices can be generated from billing runs using configured tax and currency rules, then delivered as PDFs with exportable invoice records. The automation surface includes provisioning and billing operations through its API, plus notifications for state changes through webhooks.

A common tradeoff is that the feature set assumes subscription-first billing, so ad hoc one-off invoices and frequent template-only edits require more configuration. Kill Bill fits teams that run recurring revenue with mid-cycle changes and need repeatable accounting-friendly documents across many customers.

Invoice Ninja is a self-hosted invoicing app that focuses on templates, client management, and repeatable billing workflows. It supports PDF invoice generation, recurring invoices, payment reminders, and credit notes tied to invoice records.

The system includes a REST API and webhook support for pushing invoice events into external systems. Invoice Ninja also supports multi-currency operation and import and export workflows for moving customers, invoices, and line items.

Akaunting issues and manages invoices from an on-premises installation using an integrated accounting workflow with customer, tax, and payment status tracking. It provides invoice numbering sequences, PDF invoice generation, recurring invoice setup, and credit note creation for adjustments to issued documents.

Akaunting also supports CSV invoice import and invoice template configuration, which helps standardize output across organizations. For integration work, Akaunting exposes a REST API and webhook endpoints for syncing invoice events into external systems.

InvoicePlane is a self-hosted invoicing system focused on accounts receivable workflows with recurring billing support. It generates PDF invoice templates, tracks payment statuses, and supports credit and debit notes with invoice numbering sequences.

Automation includes scheduled payment reminders and recurring invoice rules, and integration includes a REST API plus webhook delivery for events. Governance for multi-user setups is handled through role-based access controls and audit log visibility for key actions.

Dolibarr combines invoicing, payments tracking, and core ERP modules inside one self-hosted system, which makes it different from invoice-only tools. Invoices can be created from customers, exported as PDFs and CSV, and linked to accounting-oriented workflows like accounts receivable and credit notes.

The platform supports automation through recurring invoice generation and rules driven by configurable document templates and tax setup. Access can be governed with role-based permissions and an audit-oriented history of key business actions.

Odoo provides invoice management as part of a broader modular ERP, so invoicing lives alongside sales, procurement, and accounting workflows under one data structure. For self-hosted deployments, it supports invoice creation, numbering sequences, tax configuration, recurring billing, and invoice states with credit and debit note handling.

The automation surface includes scheduled tasks for payment reminders and revenue follow-ups tied to record rules across modules. Extensibility comes from add-ons and a REST API surface that can create invoices, drive document lifecycles, and sync accounting-related fields into the ERP.

Fakturama generates invoices with configurable numbering sequences and tax settings inside a self-hosted setup. The system supports recurring invoicing and common invoice document types like credit and debit notes.

It provides REST API access for integrating invoice issuance into external workflow systems. Audit-friendly activity history and export workflows help with accounts receivable tracking and data reconciliation.

WHMCS is a self-hosted billing and invoicing system originally built for service providers that manage subscriptions, tickets, and payments in one workflow. It supports invoice generation with recurring billing, credit and debit notes, and PDF output alongside client and payment tracking.

Automation comes through scheduled tasks, gateway callbacks, and admin actions that update customer balances and invoice status without exporting spreadsheets. The integration surface includes a REST API, webhooks, and add-ons for accounting and payment-related operations.