Overtaxes are essentially taxes that are too high and are burdensome for taxpayers. Some synonyms for overtaxes are overburden, overwhelm, or bog down. To overburden someone means to load them with too much work or responsibility. Similarly, to overwhelm means to inundate or to flood with an excessive amount of something. Lastly, to bog down means to slow or impede the progress of something. Overtaxes can be a significant problem for the economy and can prevent growth and development. Using these synonyms can help to emphasize the negative impact of high taxes on individuals and the wider economy.