Gifts are not deductible for the donor. They are not taxable for the recipient.
If your gift to your fiance exceeds $14,000 in 2017, you'll need to file a gift tax return (form 709). There is no tax to pay if the total of your gifts do not exceed your lifetime exclusion of $5.5 million.
Form 709 is not supported by Turbotax. You can download a copy of the form here:
https://www.irs.gov/pub/irs-pdf/f709.pdf
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