It can be tedious to track staking rewards for different blockchains and to calculate your income in fiat.
Depending on your country of residence, different rules for taxation may apply. For instance, staking rewards can be taxable at the moment of payout, based on the value of the reward in fiat.
To easily display staking rewards in fiat currency, I created https://polkatax.com/
On the website, you can find and export staking rewards for several substrate chains in your favorite fiat currency.
The project is open source: https://shorturl.at/qBOZ9
If you find https://polkatax.com/ useful, please consider supporting this proposal.
Warning: The application hasn't been extensively tested by a large number of users yet, so I recommend verifying the results for accuracy. If you encounter any issues, please open an issue on GitHub.
If many people find this website helpful, I plan to implement a function to find and export token rewards for lending, providing liquidity, and airdrops as well.