Spain and Colombia Tax Filing Guidance Highlights Costly Errors

In Spain, tax adviser Diego Astasio of AST Consultoría cautions taxpayers that common mistakes – such as confirming the IRPF draft without verifying the data, using mobile confirmations, or overlooking regional deductions – can result in penalties and extra costs. He advises delegating the process to professionals, noting that errors can cost hundreds of euros while a modest advisory fee is far cheaper. The 2025 tax filing campaign runs from 8 April to 30 June.

In Colombia, the DIAN outlines similar pitfalls: failing to register in the RUT, not retaining supporting documents, filing after the deadline, or neglecting professional assistance can lead to sanctions and interest charges. The guide provides step‑by‑step instructions for verifying obligations, registering in the RUT, reviewing exogenous information, and completing the online filing for the 2026 tax year.