Final answer:
In Texas, for 2014-2015, the sales tax, federal support, and service charges were significant sources of revenue, with sales tax being a particularly large portion, although Texas does not levy a state individual income tax.
Step-by-step explanation:
The top three revenue generating taxes in Texas for the fiscal year 2014-2015 were sales tax, federal support, and service charges, although specific percentages for that year aren't provided in the reference material. Nevertheless, based on the data for state governments in general, the sales tax was a major source, comprising about 47% of total tax revenue, while individual income taxes represented approximately 38%. While the support from the federal government and service charges are not taxes per se, they were significant sources of revenue for the state. However, Texas does not collect individual state income tax, making their revenue model unique. Instead, Texas relies heavily on sales tax and other taxes such as those on oil and gas production, which are not listed in the given figures.