Judicial and non-judicial are the two systems, and the difference is who supervises. In a judicial state the lender files suit, the borrower is served and can defend, and a court orders the sale. In a non-judicial state the loan documents contain a power of sale, and a trustee conducts the sale after giving the notices the statute requires, with no case filed unless someone brings one. Non-judicial foreclosure is generally faster and cheaper for the lender, which is one reason the recorded instrument in those states is usually a deed of trust rather than a mortgage. Some states permit both, and the choice can affect what happens to a shortfall afterward.
The 120-day floor is the single most useful federal rule here. Under 12 CFR 1024.41(f)(1) a servicer may not make the first notice or filing required for any judicial or non-judicial foreclosure process unless the borrower's mortgage loan obligation is more than 120 days delinquent. Two narrow exceptions sit alongside that condition in the same provision: a foreclosure based on the borrower's violation of a due-on-sale clause, and a servicer joining the foreclosure action of a superior or a subordinate lienholder. Either of those permits a filing without waiting out the 120 days. The rule reaches only a loan secured by a property that is the borrower's principal residence, and reverse mortgage transactions are outside it. Notably, a servicer small enough to be exempt from most of the loss mitigation machinery is still subject to this prohibition, so the 120-day floor is close to universal for a principal residence.
The dual-tracking rules are what stop the sale proceeding while an application is pending. If a borrower submits a complete loss mitigation application after the first filing but more than 37 days before a foreclosure sale, section 1024.41(g) bars the servicer from moving for judgment or an order of sale, or conducting the sale, until one of three things is true: the servicer has told the borrower they are not eligible for any option and any appeal has run its course, the borrower has rejected every option offered, or the borrower has failed to perform under an agreed option. Around that sit deadlines a borrower can hold a servicer to: an application received 45 or more days before a sale must be acknowledged in writing within five business days, with a list of what is still missing; a complete application received more than 37 days before a sale must be evaluated for every available option within 30 days; and a borrower generally has 14 days to appeal a denied loan modification.
What survives the sale is where the variation is greatest. Three consequences can outlast the property and none of them is uniform. A deficiency is the gap between what the property fetched and what was owed; some states bar the lender from pursuing it after certain kinds of foreclosure, some allow it, and some restrict it by reference to the property's fair value rather than the sale price. A right of redemption lets a former owner reclaim the property within a statutory window after the sale in some states and not at all in others. And cancelled debt can be income: where a lender forgives a shortfall, the forgiven amount is generally reportable unless a statutory exclusion applies. The credit reporting consequence is separate again, and lasts for a period fixed by the Fair Credit Reporting Act rather than by state law.
The alternatives exist and are named rather than taught here. A short sale, a deed in lieu of foreclosure, a repayment plan, a forbearance and a loan modification are all loss mitigation options a servicer may be required to evaluate, and each carries a different consequence for the deficiency and for the credit file. A homeowners association can also foreclose on unpaid assessments in many states, which is a separate lien and a separate process from the mortgage.