This thread might be helpful: "VAT / Sales tax on pledges?"
vat-sales-tax-on-pledges-t1027.htmlI am not a lawyer or an accountant, so my advice is not in league with these individuals (would recommend contacting someone who has expertise in this field).
I think you need to pay business taxes to the location where your business is registered and where your business has an office or conducts business activities. I also think you would need to pay personal income tax (if you draw any income personally from the campaign) where your place of residence is.
Would recommend checking out the articles in the thread I linked to above.