The best way to raise money for a nonprofit on Tilt would be to use the 'Organize' option and setting up the receiving bank account as either (1) your personal checking account or (2) the checking account of the organization. In #1, you'd donate the money yourself.
Every donor gets a contribution receipt from Tilt in their email, which can serve well for tax deductions; however, this isn't always the case.
If you're looking for a better understanding of how tax deductions work for this purpose, check out this page on the IRS's website, "Eight Tips for Deducting Charitable Donations" (hint: #6 and #7 are most helpful :).
I've raised money for a nonprofit before. When did things change? Why?
Unfortunately, as of February 15th, 2016, we've stopped supporting the formal 'Nonprofit Fundraising' option on Tilt.
We did this so that we could move money much faster. We used to have to mail physical checks to nonprofits (which took 1-2 weeks), but with payouts being deposited directly into nonprofit or your personal checking accounts, it takes 1-2 business days.
: You can add bank account details here. For the first three fields, put in those of your Organization's routing and checking account details, and for the remaining fields key in your own personal details (name, address, date of birth etc.) If your organization does not have a bank account, feel free to put your personal routing and checking account details in.