## Separate the money first
Use a dedicated account or clear labels. Platform fees and refunds are not “net profit.” Rough Side-hustle quarterly tax estimate calculator and Self-employment tax beat a surprise bill. Rules in Croatia vary — educational only.
## VAT/GST thresholds
Some hustles hit registration thresholds earlier than you think. Peek at VAT GST and Invoice with tax before you scale ads. When unsure, official guidance for Croatia beats a blog post.
---
Note: Educational content from Calcly Croatia. Official sources (Porezna uprava RH educational income-tax model 2026.) and licensed professionals take priority in Croatia.