Does my personal guarantee also cover a new loan my corporation takes out later?

It depends entirely on how the guarantee is worded, since this is not something that follows automatically either way. A personal guarantee limited to a specifically identified loan or facility generally does not extend on its own to new, separate borrowing the corporation takes on afterward, meaning a fresh guarantee would typically be needed for a genuinely new loan from the same or a different lender.

Many lenders, however, use broader "continuing guarantee" language that is drafted to cover all present and future indebtedness the corporation owes to that specific lender, not just the original loan the guarantee was signed alongside, which would capture later borrowing from the same lender without requiring a new guarantee to be signed each time. Because this distinction can have a significant impact on someone's ongoing personal exposure, anyone who has previously given a guarantee and is considering having their corporation borrow again, from the same lender or elsewhere, should check the actual scope of the existing guarantee rather than assuming either that a new guarantee is definitely required, or that the old one definitely does not apply.