We can easily qualify the example to avoid using a black box...whether its 'taxa...

001sky on Dec 31, 2013 | parent | context | favorite | on: Two years after quitting my job: 2013 in review

We can easily qualify the example to avoid using a black box...whether its 'taxable' income or 'marginal tax rate' etc. (which are actually implied). If you're saying something beyond this, then just say it.