Comparing annual rates would be one way to go.
You could also compare actual vs expected deaths, looking at excess deaths.
IFoA is doing that in Britain. T'hey're looking week by week at the death rates and comparing to the prior year.
https://www.actuaries.org.uk/learn-and-develop/continuous-mortality-investigation/other-cmi-outputs/mortality-monitorCDC also has that available (note that there is likely reporting lag in the most recent few weeks in the CDC data).
https://www.cdc.gov/nchs/nvss/vsrr/covid19/excess_deaths.htmOn the individual level, of course you cant tell if someone would have died regardless. in the overall population level, you can be reasonably confident whether the total deaths would have happened regardless.
This will be studied for years. Very interesting stuff, IMO.