What is Invoicing, Expense - and Refund Management
Streamlining Financial Management: Efficient Invoice, Expense & Refund Processing
Financial management encompasses Invoice Management or invoice processing, which involves billing customers for utilized products, services, or time. By employing automation, the invoicing process is enhanced, with mechanisms in place to send automated reminders for unsettled invoices. Expense and refund management, on the other hand, monitors employees' expenditures and can even automate the refund process. Together, these system components offer superior cash flow tracking and provide managers with a comprehensive financial overview.
Expense Tracking
Track, manage and pay expenses, project - or employee based.Credit Notes
Issue and manage Refunds or Credit Notes towards your clients.“ The easiest and fastest ERP I worked with. Fabulous support and excellent data integrations. Using it for all of my companies and I have to say.. I am truly satisfied. ”

Benjamin "Ben" Talin
CEO | MoreThanDigitalAll the features you need to manage invoices, expenses, and even refunds
Manage your cash flow with all the incoming and outgoing invoices. Get full traceability of invoices and expenses.
Automate the invoicing workflow
Get your invoices paid faster
Make invoices, send the invoices immediately, notify someone overdue, and offer online payments. The invoicing process can even handle multiple currencies and can be connected with your ecommerce.
An additional feature is the "Invoice Merging" - Combine unlimited invoices into a single invoice for easier processing. Automate your payment reminders and customer notifications via eMail, SMS, or custom dashboards.
- Automate your invoicing
- Notify your customers via many channels
- Integrate with ecommerce
- Manage multiple currencies
Trace customer related expenses
Expense Tracking and Expense Management
Track all expenses related to customers, projects, or even tasks. Get a simple expense tracking in place that even handles multicurrency expense management. This integration allows for transparent expense processing and fast billing.
- Track expenses for customers, projects, and tasks
- Multicurrency Expense Management
- Transparent expense tracking
Track refundable expenses for employees
Easily manage allowances and refund your staff
Track all expenses your employees cover and automate the process of refunding. Managing these expenses gets more manageable and even allows for a better overview—set allowances and track expenses of employees with a single dashboard.
- Manage employee allowances
- Track expenses and reimburse them
- Attach invoices to expenses
100% Future Proof
Prepare for upcoming changes in EU E-invoicing legislation
E-Invoice compliance ensures that invoices meet legal and regulatory requirements, safeguarding businesses from penalties and fostering trust in transactions. E-invoicing compliant with EU standards such as PEPPOL, XRechnung, and others streamlines cross-border trade, ensuring seamless digital communication and adherence to local and EU-wide regulations.
- Compliant with European Industry Norm EN 16931
- PEPPOL Compliant
- German X-Rechnung 3.0.1 and ZUGFeRD 2.0 Compliant
Less Hassle, More Growth – The SIX ERP Way.
The Invoicing Solution leading companies trust
Tap into a global network of companies who already know and trust SIX.
have been issued by SIX
tracked and managed by SIX
use SIX to drive business and growth
We are not SaaS - You own your data!
Own your Invoicing and Expense data
You have your own decoupled pods with all your data. You decide who can access invoice and expense-related data. You own your data - always!
European solution
Trusted solution built with the strict European standards in mind. SIX is built for leading global companies.
GDPR compliant
Be on the safe side when it comes to data compliance. Our GDPR module makes it possible to manage all data without any hassles safely.
Interesting Blog Articles

Data-Driven Decision-Making for Business Success
In the digital age, data is the key to success for any business. Companies must effectively use internal and external data sources to make informed decisions that will lead to improved performance. From ERP and CRM systems to industry experts like Gartner, MoreThanDigital Insights, and McKinsey, various data sources can...
Warehouse management systems (WMS) explained – Managing modern businesses.
Warehouse operations are at the heart of many businesses, enabling the smooth and efficient flow of goods to customers. However, managing inventory, orders, shipping, and personnel in one or more warehouses is an enormously complex undertaking. Errors and inefficiencies in warehouse management can lead to product shortages, delayed shipments, and...
Understanding Warehouse Management Solutions
A warehouse management system (WMS) is a software application that supports the day-to-day operations in a warehouse. A WMS helps to control and direct the movement of materials within a warehouse and plays an essential role in optimizing the efficiency of these operations. There are many things to consider when...Hundreds of leading companies trust SIX
Want to see SIX for yourself?
Need help, have questions or want to get a free demo?
Please read our Privacy Policy on how we process personal data. We will never share your data!