Nicht jeder kleine Betrieb hat eine USt-IdNr, manche haben nur eine Steuernummer. Auf der Rechnung ist das zulässig: § 14 Abs. 4 UStG verlangt die Steuernummer oder die USt-IdNr (https://www.gesetze-i
Wer Rechnungen in Excel schreibt, rundet die Umsatzsteuer oft pro Zeile und addiert danach. Die Norm EN 16931 rechnet aber pro Steuersatz. Das ergibt schnell einen Cent Unterschied. Ich wollte wissen,
A script can produce rows that look right and still be wrong: one dropped line gives you a clean CSV with a wrong total, and nothing warns you. This post extracts the rows with pdfplumber, then uses t
If you bill by the hour and keep your meetings in Google Calendar, Outlook or Apple Calendar, an .ics export holds everything you need for a timesheet. This post shows a short standard-library script
Germany is phasing in mandatory structured e-invoices for B2B: businesses must be able to receive them since 2025, and the obligation to issue them follows in 2027 and 2028 depending on turnover (offi
The Apple Health export is a single export.xml that is often hundreds of megabytes, sometimes several gigabytes. Parsing it with a normal DOM parser can exhaust your RAM. This post shows a streaming p
Many banks only let you download a CSV, while QuickBooks and Quicken want OFX or QBO. A QBO file is plain text: an OFX 1.02 document with a short header. This post shows the smallest file that imports