HOAI-Pro 2024supports planners in transparent and legally compliant fee calculation as well as the preparation of offers and invoices according to HOAI 2021, 2013, 2009 and 1996. The software offers flexible setting options for billing in accordance with the ECJ ruling. For example, interpolation, fee zone and fee rate can be bypassed for chargeable costs, cost approach designations can be changed or service phases can be individually subdivided. In deviation from the HOAI, separate or additional service phases can be defined and surcharges and discounts can also be freely defined. Flat-rate fees also offer the possibility of freely agreeing on additional services or granting discounts. In addition, offers or invoices can be designed independently of rules and regulations using free service profiles. The contracts included in the programme have also been adapted to the latest EuGH ruling. It is also possible to calculate fees according to DIN 276, version 2018-12, including GAEB import.