From what I'm seeing, that's not right, and Dunkin Brands[1] makes roughly 20% of Intuit's[2] income. Regardless, the amount a company is willing to spend on lobbying is not only dictated by their income, but also by how much they stand to gain or lose. I think Intuit may see legislation that makes taxes easier for many people as the beginnings of a trend that could be an existential crises for them. Even if they were on par with a Dunkin Donuts, I could see how they would be much more willing to spend any potential profits to fight this.

1: http://amigobulls.com/stocks/DNKN/income-stament/annual

2: http://amigobulls.com/stocks/INTU/income-statement/annual