If the "gift" was repaid within the time period that would allow a 1040X to be filed, then the gift could be re-characterized.
If that time had already expired, then there would not be a method to reverse the declaring the transaction as a gift.
Of course unless the gift dwarfed the lifetime exemption, the gift giver could have written the gift off against the lifetime exemption, and delayed the requirement to pay taxes on gifts until either later in life, or as a part of setting their estate.
Because Congress has a habit of adjusting the level of the lifetime exemption, I wouldn't think it was advisable to pay the tax for a gift that slightly exceeded the annual limit, because the likelihood of exceeding the lifetime limit for most people is small.
Highlights of Lifetime Exemptions and Tax Rates 2000-2022
Year |
Gift Tax Exemption |
Top Gift Tax Rate |
2000 |
$675,000 |
55% |
2001 |
$675,000 |
55% |
2002 |
$1 million |
50% |
2011 |
$5 million |
35% |
2012 |
$5.12 million |
35% |
2017 |
$5.49 million |
40% |
2018 |
$11.18 million |
40% |
2019 |
$11.4 million |
40% |
2020 |
$11.58 million |
40% |
2021 |
$11.7 million |
40% |
2022 |
$12.06 million |
40% |
Of course if congress does nothing to adjust the lifetime limit, then it is due to go back to path it was on before the 2018 adjustment.