Invoicing Software

Optimized billing with automated invoicing

Create individual invoices for projects and customers, automate the billing of expenses, and always keep track of open items and sales forecasts.

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More than 3,000 companies rely on ZEP

Automated Invoicing with ZEP

With ZEP, you can process your entire invoicing centrally and completely without paperwork.

Automatic invoicing

Generate invoices directly from project times

Generate invoices automatically from recorded project times and expenses with intelligent templates for recurring billing cycles. Use stored customer data and flexible billing methods (hourly rates, flat rates, fixed prices) to create individual invoices quickly and in a standardized way. The automatic data transfer ensures error-free billing without manual entries.

Modern Invoice Formats

From XRechnung to ZUGFeRD 2.1

Create XInvoices and ZUGFeRD 2.1-compliant documents automatically with intelligent formatting that takes into account all legal requirements. You can compare different invoice formats while keeping track of compliance requirements at all times and ensuring that your invoices meet all standards. The invoicing software makes it possible to integrate modern payment options and speed up payment processes.

Automated billing processes

Invoice planning and reminder

Control your billing as needed with flexible or fixed billing intervals that automatically adapt to project processes. Each adjustment is transparently documented and billing alternatives can be compared as required. With the option of individually defining payment plans or billing on a project-based basis, you can adapt invoicing to your business requirements and keep an eye on your sales goals.

Versatile evaluation options

All billing details at a glance

Monitor your incoming payments with automatic reminders and intelligent reminder procedures. Integrated Controlling ensures a complete overview through detailed evaluations before critical payment terms are achieved. Thanks to digital financial management, you have access to all billing data at any time, create sales forecasts and use the software not only to bill, but also to plan.

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Discover the possibilities of ZEP

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Hosting and development in Germany
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More than 3,000 companies already rely on ZEP

The time tracking of choice — from startups to large corporations.

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Certified Cloud Solution 2025 ZEP

“Ideal employee management support thanks to a 360 degree view of employee availability, daily reports and automated vacation and absence management.”

Thorsten
CIO

“Comprehensive solution for recording project and working times. In particular, compliance with legal regulations (minimum rest time, break times, maximum working hours, etc.) can be tracked very well. “

Julia
HR Manager

“We have been using ZEP for over 10 years to record working hours (billable, non-billable). This is a great basis for invoicing our customers.”

Johannes
Head of Success

“ZEP impresses with its intuitive time and project management and offers excellent customer support!”

Philipp
IT Consultant

“Quick project bookings and evaluations. Yet a high degree of flexibility. Good modular design. You can easily adapt the system to your own needs.”

Benjamin
Senior Business Consultant

“We use ZEP for precise time recording, vacation management and absenteeism. With ZEP, our employees can also record their working hours while working from home, which enabled us to replace several previously used tools.”

Stefan
District Manager

“Ideal employee management support thanks to a 360 degree view of employee availability, daily reports and automated vacation and absence management.”

Thorsten
CIO

“Comprehensive solution for recording project and working times. In particular, compliance with legal regulations (minimum rest time, break times, maximum working hours, etc.) can be tracked very well. “

Julia
HR Manager

“We have been using ZEP for over 10 years to record working hours (billable, non-billable). This is a great basis for invoicing our customers.”

Johannes
Head of Success

“ZEP impresses with its intuitive time and project management and offers excellent customer support!”

Philipp
IT Consultant

“Quick project bookings and evaluations. Yet a high degree of flexibility. Good modular design. You can easily adapt the system to your own needs.”

Benjamin
Senior Business Consultant

“We use ZEP for precise time recording, vacation management and absenteeism. With ZEP, our employees can also record their working hours while working from home, which enabled us to replace several previously used tools.”

Stefan
District Manager

ZEP is Funktionen

Bookable modules

Absences & Overtime

Centrally manage overtime, absences & vacations

Manage, Approve, and Monitor Overtime, Absenteeism, and Vacation Requests all in one place.

Ticketing system

Ticket System for Projects and Support Requests

Divide projects into tasks, receive support requests directly as tickets and record working hours directly on tickets and tasks.

Resource Planning

Plan capacity before it runs short

See on one timeline who still has capacity and who is overbooked, calculated from regular working hours, public holidays and absences.

FAQ about invoicing via software

Do you need more information about invoicing with ZEP? Here are the answers to the most common questions from our customers.

How does invoicing in ZEP make it easier to bill for services delivered?

From billing one or several projects for a customer to detailed invoices with billed hours and receipts, invoicing in ZEP offers a wide range of features that simplify the process and enable automated invoicing.

How flexible is ZEP when billing effort by hourly and daily rate or at a fixed price?

ZEP lets you bill effort by hourly and daily rate or at a fixed price. This gives you the flexibility to choose different billing methods depending on project requirements.

How does ZEP help me define individual payment plans?

ZEP lets you define payment plans with monthly, quarterly or annually recurring invoice items. You can set these individual payment plans as soon as you create the project, so invoicing is planned optimally.

What controlling benefits do I get with ZEP?

ZEP offers wide-ranging insight into financial processes. From an overview of invoice items due for billing to documentation of paid invoices, its reporting enables comprehensive controlling.

How flexible is ZEP in terms of invoice formats and sending invoices?

ZEP supports XRechnung and ZUGFeRD 2.1 for electronic invoices. It can also print a payment code, PayPal.Me link and Swiss QR code on invoices. Sending invoices by email is configurable, and automated text modules make it easier to create invoice items. Payment terms per customer and percentage surcharges or discounts can also be configured flexibly.

How much does the invoicing software cost?

Invoicing is included from ZEP Operations, from €29 per user per month on an annual contract or €35 monthly. It is also included in ZEP Business. Our price calculator shows your individual monthly fee at a glance.

How do I make sure all billable hours are actually invoiced?

ZEP offers automatic reminders for services that have not yet been billed and overviews of open billing items. The system alerts you to forgotten hours and shows you exactly which projects still need to be billed, so you don’t miss out on revenue.

Does ZEP also support international billing in different currencies?

Yes, ZEP can create invoices in different currencies and manages exchange rates automatically. You can bill international customers in their local currency while the system converts and consolidates all amounts internally for your controlling.

How does the integration with my accounting software work?

ZEP offers export functions for common accounting programs and can provide invoice data in various formats. Our experts are happy to advise you on setting up the interfaces so your invoices transfer seamlessly into your existing accounting.