Is this tacky?

Let me say first off, I work at a Title Company, and no matter how low interests goes, it all depends if you can get qualified at that interest rate based on you credit score and debt to income ratio. Interest rates can go down to 1% but it all depends if you qualify for it. So with that said, wait for the wedding to have your Dad pay unless you have the funds to pay for it yourself then you can get married when you want.