Terumos 6:1-2

Terumos 6:1

If a person eats terumah accidentally, he must pay for it and add one-fifth. This is true whether he eats it, drinks it or anoints with it, whether the terumah is ritually clean or ritually unclean. He must pay the original value plus one-fifth, and if he ate the fifth he must repay adding a fifth of that fifth. One may not repay using terumah; he must use tithed, non-sanctified produce, which becomes terumah. What he uses to repay becomes terumah and the kohein cannot turn it down.

Terumos 6:2

If the daughter of a non-kohein ate terumah and later married a kohein (which enables her to eat terumah), if what she ate had not yet been given to a kohein, she repays the value plus one-fifth to herself (since she is now eligible to eat terumah). If she ate terumah that had already been given to a kohein, she pays the value to the owner and the fifth to herself. This is because if one eats terumah accidentally, he must pay the original value to the owner of the terumah but he can pay the fifth to any kohein he wishes.