Not sure which year to file inventory expenses?

Hello everyone,

 

Hope you all are doing good.

 

I had previous business inventory in the 2019 that got completely sold in November 2019 without any profit. Then in December 2019, I bought new inventory that was not related to previous inventory at all. I did not start selling until January 2020. 

 

Question is, which year do I show the inventory I bought in 2019? In 2019 year tax or 2020 tax?

 

Thanks much