If for some reason you didn't want to touch your lifetime exclusion, you could give up to the annual exclusion ($ 30k if you are single, $ 60k if married) and then you could either give the remaining $ 10k next year, or call the remaining $ 10k a loan and charge interest based on applicable federal rates (AFR, currently ~ 2 %). (money.stackexchange.com)
During April 2018, for example, the applicable federal rate for long - term loans is 3.00 % if the interest is compounded monthly. (interest.com)
Low interest rates if the applicable federal rate (AFR), when the plan is implemented, is below current market interest rates. (investopedia.com)