When a new partner brings his share of goodwill in cash, the amount is credited to:

When an incoming partner brings their share of goodwill in cash, the accounting entry passed in the books of the firm is:
$$\text{Cash/Bank A/c}\text{Dr.}$$
$$\text{To Premium for Goodwill A/c}$$
Therefore, the amount brought in as goodwill is credited to the Premium for Goodwill account. Later, this premium is distributed among the sacrificing partners in their sacrificing ratio.