A mortgage servicer is not usually the company that made the loan. It is the company that takes payments, runs escrow, applies funds, and manages default. Because borrowers cannot choose their servicer and cannot leave without refinancing, federal law gives them a formal written channel instead: the notice of error and the request for information under RESPA's Regulation X.

The operative rule is 12 CFR § 1024.35. It lists categories of servicing errors, requires the servicer to acknowledge a written notice within a short window, and requires a substantive response within a longer one — either correcting the error and notifying the borrower, or explaining after investigation why no error occurred. Its companion, § 1024.36, does the same for requests for information. Both are enforceable, and both create a paper trail that matters far more than a phone call.

What counts as a servicing error

Section 1024.35(b) enumerates categories rather than leaving "error" undefined. In practical terms they cover the servicing lifecycle:

  • Failure to accept a payment that conforms to the servicer's written requirements.
  • Failure to apply an accepted payment to principal, interest, escrow, or other charges as the loan documents and applicable law require.
  • Failure to make escrow disbursements — taxes, insurance, or other charges — in a timely manner, or to refund an escrow balance when required.
  • Imposition of a fee or charge without a reasonable basis.
  • Failure to provide an accurate payoff balance within a reasonable time of a request.
  • Failure to provide accurate information about loss mitigation options and foreclosure.
  • Failure to transfer information accurately and timely on a servicing transfer.
  • Moving for foreclosure judgment or order of sale, or conducting a foreclosure sale, in violation of the loss mitigation rules.
  • A catch-all for any other error relating to the servicing of the borrower's mortgage loan.

That final catch-all is why the notice of error is a broadly useful tool. Misapplied payments after a servicing transfer, escrow analyses that produce a shortage the borrower cannot reconcile, force-placed insurance imposed while a policy was in force, and fees that appear on a statement without explanation all fit comfortably within it.

Watch out: a servicer may treat a notice as duplicative, overbroad, untimely, or as concerning a loan already discharged, and respond by notifying the borrower that it is not required to investigate. Those are defined categories with conditions, not a general escape hatch — but they are a reason to write one clear, specific letter rather than a series of sprawling ones.

The clock, and the three speeds it runs at

Regulation X response timing for notices of error
Stage or error typeDeadlineNotes
AcknowledgementWithin 5 days of receipt, excluding weekends and legal public holidaysWritten acknowledgement that the notice was received
Standard errorsWithin 30 days of receipt, excluding weekends and legal public holidaysA 15-day extension is available with notice to the borrower
Payoff statement errorsNot later than 7 days, excluding weekends and legal public holidaysNo extension available
Foreclosure-related errorsThe earlier of 30 days after receipt or before a foreclosure saleNo extension available; the sale date can compress the window sharply
Requests for informationGenerally 30 days; 10 business days for the identity of the owner or assignee of the loanAcknowledgement within the same 5-day window; extension available in most cases

Two response outcomes are permitted. The servicer either corrects the error, notifies the borrower in writing of the correction and the effective date, and provides contact information for further assistance — or, after a reasonable investigation, notifies the borrower that no error occurred, explains the basis for that conclusion, states the borrower's right to request the documents relied on, and provides contact information.

Two protections come along with the process. The servicer may not charge a fee or require the borrower to pay anything as a condition of responding. And for 60 days after receiving a notice of error, a servicer generally may not furnish adverse information to a consumer reporting agency about any payment that is the subject of the notice. That credit-reporting pause is one of the most practically valuable features of the rule, and it works alongside the separate dispute process described in our guide to correcting credit report errors.

Writing a notice that starts the clock

  1. Find the right address. Check the servicer's website, your periodic statement, and the notice you received when servicing transferred. If an exclusive address for error notices is designated, use exactly that address — this is the single most common reason a letter goes nowhere.
  2. Identify yourself and the loan. The rule requires the borrower's name and information that lets the servicer identify the account. Include the loan number and property address.
  3. State the error, not the frustration. One or two sentences identifying what the servicer did or failed to do, with dates and amounts. "My payment of $1,842.17 received on March 3 was applied to a suspense account instead of to the March installment" is a notice of error. "Your company is impossible to deal with" is not.
  4. Ask separately for documents. A request for information under § 1024.36 can seek the payment history, escrow analyses, the identity of the loan's owner, and copies of the notes and correspondence. Sending both letters lets each run on its own track.
  5. Send it so you can prove delivery. Certified mail with return receipt, or the servicer's documented electronic channel if it designates one. Keep a copy of everything.
  6. Calendar the response dates. Note the acknowledgement date and the response date, and record whether an extension notice arrived.

Practical step: keep making payments you believe are owed while the dispute runs, if you can do so without conceding the disputed amount. A servicing dispute does not suspend the loan obligation, and a default during the investigation complicates every remedy that follows.

If the servicer ignores or mishandles the notice

RESPA provides a private right of action for servicing violations, with actual damages, potential additional damages for a pattern or practice of noncompliance, and costs and attorney's fees where the borrower prevails. Actual damages are the practical hurdle: courts generally require the borrower to show harm tied to the servicer's failure, which is another reason documentation matters. Out-of-pocket costs, denied refinancing, and credit consequences are the categories most often argued.

Before litigation, three escalation paths are usually worth using. A complaint to the CFPB is routed to the company with a tracked response. State regulators license and examine most servicers and often have their own complaint processes with real leverage. And where foreclosure is pending, many states operate mediation or conference programs that pull the servicer into a supervised conversation — though these programs exist in some states and not others, and their timing rules differ.

The related Regulation Z servicing requirements are worth knowing too: periodic statement content, prompt crediting of payments, and payoff statement timing all sit in Regulation Z rather than Regulation X, so a single complaint often implicates both rulebooks.

For servicers and subservicers

From the operating side, the rule is mostly a mail-handling and records problem. The failures that produce enforcement actions and litigation are consistent: notices routed to a general customer service queue and never identified as notices of error; acknowledgements sent but no substantive response; investigations that consist of re-reading the same system screen that generated the error; and responses that assert no error without explaining the basis or offering the documents relied on.

Servicing transfers deserve particular attention because errors cluster there — payment histories that do not reconcile, escrow balances that shift, and loss mitigation applications that vanish between systems. Where subservicers or vendors perform the work, the oversight expectations are the same as for any critical third party; our guide to third-party risk management for financial institutions covers the diligence and monitoring structure. And because loss mitigation decisions are credit decisions, the fair lending testing described in our guide to ECOA and disparate impact applies to workout approvals and denials, not only to originations.

Quick answers

Is this the same as a "qualified written request"?

The older RESPA term is qualified written request, and it still appears in statutes and in some servicer correspondence. Regulation X now separates the concept into notices of error under § 1024.35 and requests for information under § 1024.36. A letter labeled a qualified written request that meets the content requirements is generally treated under the applicable section, but using the current terminology avoids arguments.

Can I send a notice of error by email or through the servicer's portal?

Only if the servicer permits it. Servicers may designate an exclusive address for notices of error, and if they do, submissions elsewhere may not trigger the deadlines. Some servicers designate electronic channels; many still require mail. Confirm the designated address before sending, and if in doubt, send by mail with delivery confirmation.

Does sending a notice of error stop a foreclosure?

Not automatically. A notice of error is not a stay. What Regulation X does provide is a separate set of loss mitigation protections that can restrict moving for judgment or conducting a sale while a complete application is pending, subject to timing conditions. Foreclosure procedure itself is state law and differs significantly — judicial in some states, nonjudicial in others, with different notice and cure periods.

What if the servicer says it investigated and found no error?

The response must explain the basis for that conclusion and tell you that you can request the documents the servicer relied on. Request them. If the documents contradict the conclusion, that record is the foundation for a regulator complaint or a claim. If they support it, you have learned something useful at no cost.

Do these rules apply to every mortgage?

They apply to federally related mortgage loans as defined in RESPA, which covers most residential mortgages, but there are exemptions and partial exemptions — including for small servicers below a loan-count threshold, reverse mortgages, and open-end lines of credit. Check whether your loan and your servicer fall within an exemption before relying on a specific deadline.

A sensible order of operations

Pull your payment history and statements first, so the letter identifies a specific transaction rather than a general complaint. Find the designated notice-of-error address. Send a short, dated, factual notice of error and a separate request for information for the documents you need, both with delivery proof. Calendar the acknowledgement and response dates and note any extension notice.

If the response is silence or a bare denial, escalate to the CFPB and your state regulator with the letter, the delivery proof, and the response attached. Similar servicing dynamics — misapplied payments, opaque histories, transfers that lose records — appear across loan types, and our guide to student loan servicing disputes and borrower records covers the parallel process. Related consumer-finance guides are collected in the banking, payments, and fintech pathway.