[jleader]

I've worked at companies where accounting was needed to qualify for R&D tax credits, which required tracking what percentage of developers' time was spent on particular projects. My bosses at those times said something like "we have to fill these out or the company will pay more taxes, they're not for me. Make them as accurate as you can, but don't obsess over them. I'm not going use them to manage your time."

[jacques_chester]

In Australia some businesses can get tax deductions of 140% for R&D time. While subcontracting to a software firm I used to fill them in for this exact reason.