"taxing" in the verb sense
levy a tax on
"The State taxes alcohol heavily"
"Clothing is not taxed in our state"
2. tax, assess
set or determine the amount of (a payment such as a fine)
3. tax, task
use to the limit
"you are taxing my patience"
make a charge against or accuse
"They taxed him failure to appear in court"
"taxing" in the adjective sense
1. burdensome, onerous, taxing
not easily borne wearing I only had to greet the guests"
"the burdensome task of preparing the income tax return"
"my duties weren't onerous
"a taxing schedule"
Source: WordNet® (An amazing lexical database of English)
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