You can enter medical expenses for the year in which you paid them. The year the charges were incurred is not relevant. If you paid the expenses in 2020 they can go on your 2020 tax return which you will prepare next year.
Please note that there is a tough threshold to meet when claiming medical expenses, and they will only affect your refund or tax due if you meet that threshold AND have enough itemized deductions to exceed your standard deduction. Only the amount of medical expenses that are OVER 7.5% of your AGI "count" as a possible itemized deduction.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
