With the passage of the new tax reform laws, the annual tax burden on low-income taxpayers will be reduced, on average, by anywhere from $100 to $300.
Conclusion (clearly)
Tax reform is in the interest of low-income taxpayers.
Evidence
With the passage of the new tax reform laws, the annual tax burden on low-income taxpayers will be reduced, on average, by anywhere from $100 to $300.
Evaluate
The argument is suggesting a Recommendation: Tax reform should be supported because it's supposedly beneficial to low-income taxpayers. The evidence provided is the reduction in annual tax burden ($100 to $300) for low-income taxpayers.
To weaken this argument, we need to find a reason why low-income taxpayers might not benefit as much as the conclusion suggests, or why the reduction in tax burden might be offset by other negative effects.
It's important to consider both the financial benefits and any other economic impacts the tax reform might have that could harm low-income taxpayers. We might ask ourselves,
Goal
Let's find an answer that presents an aspect of the tax reform that could harm or disadvantage low-income taxpayers, offsetting or outweighing the positive impact of the tax reduction.