The medical expenses were calculated in the final tax returns.
One year's worth of medical expenses were calculated in the final tax returns.
ご質問ありがとうございます。
この場合は、「確定申告のために医療費を計算しました」は英語で「The medical expenses were calculated for the final tax returns.」と言えます。
また、具体的に「一年分の医療費」と言いたい場合、「One year's worth of medical expenses were calculated in the final tax returns.」になります。
ご参考になれば幸いです。
アメリカ合衆国 
