wtf is ibd6?

IBD6 is a web tool that helps Spanish taxpayers generate a required financial report from their Interactive Brokers account data. Spain requires residents to file an annual "D6 report" declaring certain foreign investments. Rather than manually compiling that paperwork, a user can export a FlexQuery from their broker, upload it to this app, and get back a .aforixm file ready for the D6 filing. The process is straightforward. Interactive Brokers offers a feature called FlexQuery that lets customers export their account data in a structured format. The app takes that exported file as input, reads the relevant positions and balances, and formats everything into the specific file structure the Spanish tax authorities expect for the D6 report. The result is a file you can use directly in your tax submission. This tool is aimed at individual investors or small accounting firms in Spain who have brokerage accounts with Interactive Brokers and need to comply with Spanish reporting requirements. For example, if you're a Spanish resident who holds foreign securities through that broker, you'd normally need to gather your year-end positions and translate them into the D6 format by hand, this app automates that conversion. The app is available as a hosted web page, so there's nothing to install. The README includes a standard disclaimer that the software may contain errors and should be used at your own risk, which is worth noting since it handles tax-related data. It also points to official Spanish tax authority documentation for Modelo 720, a related filing for declaring foreign assets, though the tool itself is specifically for the D6 report.