Kieferorthopädische Behandlungkosten Erstattung

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Hello,
in 2023 my insursance SBK gave me 600€ as refund of ortodontics costs during previous years for my son.
Must I insert in tax declaration? If yes where?

[L. E. Fant]

If you deducted the treatment from the taxes in the past, the assessments of these years should be rectified.

[medicol]

in the past years I only paid nothing deducted