I fucked up by 10% my prevision of FY2024 ふるさと納税 :(

Just a rant on myself 🙁

I have used multiple simulation website like this one:

https://www.furusato-tax.jp/about/simulation

As per the simulation I could have used for like 30% more, but in the 寄付金控除 section of my 源泉徴収票 of FY2025, the amount is about 10% lower than what I actually paid 🙁