Hi there, @richardgreen1.
Please know that QuickBooks Desktop Mac 2020 has not been officially tested for compatibility with MacBook Air 2025 running Tahoe iOS, as QuickBooks has discontinued this product.
While QuickBooks Desktop Mac 2020 may still operate, you could experience compatibility issues when using it with a newer macOS version. To ensure smooth performance, I recommend upgrading your QBDT to the latest version.
If you have more questions, please let us know. We'll be here to help.