I managed to raise 100k on a gofund.me campaign to teach a hands on electronics repair workshop. This amount lets me do workshops at least twice a month for the next 3+ years. Since I received this funding this year, do I pay taxes on this 100k this year?

But, since I haven't done the class in the future yet. I can't write off expenses for the future. I'm not sure how taxes work in this case as this is technically funding for the future and I don't know what my real expenses are yet. How do you space this earned income into future years?