---
title: How to Set Up and Service ARM Loans in The Mortgage Office®
description: Learn how to set up and service Adjustable-Rate Mortgage (ARM) loans in The Mortgage Office®, including ARM index selection, rate and payment adjustment processing, borrower notices, special considerations for billable loans, and compliance best practices.
---

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July 31, 2025

# How to Set Up and Service ARM Loans in The Mortgage Office®

## This guide provides step-by-step instructions on setting up and servicing Adjustable-Rate Mortgage (ARM) loans in The Mortgage Office® (TMO). It includes instructions on downloading and editing ARM indexes, setting up ARM loan files, processing rate and payment adjustments, borrower notices, servicing tips, and special considerations for Billable Loans.

### **What is an ARM Loan?**

An **Adjustable-Rate Mortgage (ARM)** loan has an interest rate that fluctuates based on a published financial index. The index reflects current market conditions, and as it moves up or down, The Mortgage Office® updates the values and makes them available for download. 

### **What is an ARM Index?**

An ARM index is the reference point used to determine the loan’s interest rate.   
The Mortgage Office® supports multiple indexes, including: 

1. **11th District Cost of Funds (COFI)**
2. **CMT (1-Year, 2-Year, 3-Year, 5-Year, 7-Year, 10-Year, 20-Year)**
3. **CMT 3-Month and 6-Month**
4. **Royal Bank of Canada Prime Rate**
5. **Secondary Market CD (1, 3, and 6-Month)**
6. **Secured Overnight Financing Rate (SOFR)**
7. **USD LIBOR – 1 month**
8. **WSJ Prime Rate**

**CAUTION:** Applied Business Software makes every reasonable effort to present complete, accurate information but assumes no liability for errors or omissions. 

Each index has different characteristics. For example: 

1. **COFI** is a monthly average of interest rates on savings in AZ, CA, and NV.
2. **CMT** indexes are Treasury yields adjusted to constant maturities.
3. **SOFR** measures overnight borrowing collateralized by U.S. Treasuries.
4. **WSJ Prime Rate** is set by a consensus of major U.S. banks.

### **How to Download ARM Index Rate History**

#### **Through the Loan File**

1. Go to **Loan Servicing → Loans → All Loans**.
2. Select the loan you want to modify.
3. Click **Edit** (pencil icon) or double-click the file.
4. Navigate to **Terms → ARM tab**.
5. Click the **Index** hyperlink.   
   ![A screenshot of a computer
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-2.png?width=670&height=279&name=undefined-2.png)
6. Select the index and click **Download Latest Rate History**. 
   
   ![A screenshot of a computer
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-4.png?width=670&height=266&name=undefined-4.png)
7. In the assistant, check the box for the index(es) you want and click **Yes, download index history now**.

![A screenshot of a computer error

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### **Through Tasks & Reports**

1. Go to **Loan Servicing → Tasks & Reports**.
2. Under **Adjustable-Rate Mortgages**, click **Download Index Rate History**.   
   ![A screenshot of a computer
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-30-2025-11-50-49-7806-PM.png?width=670&height=294&name=undefined-Jul-30-2025-11-50-49-7806-PM.png)
3. Use the download assistant to select the index(es) and confirm.

### **How to Set Up an ARM Loan**

**TIP:** Adjustable-rate mortgages (ARM) are loans where the interest rate changes periodically in relation to an index. Payments may go up or down accordingly. 

**Steps** 

1. Go to **Loan Servicing → Loans → All Loans**.
2. Select the loan and click **Edit**.
3. In the **Terms** page, select **ARM-Adjustable Rate** in the Rate Type dropdown (Options tab).   
   ![A screenshot of a computer
   
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4. Click the **ARM** tab.   
   ![A screenshot of a computer
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-30-2025-11-52-07-0449-PM.png?width=670&height=349&name=undefined-Jul-30-2025-11-52-07-0449-PM.png)
5. **Choose the Index**  
     1. From the dropdown, select the index you want this loan tied to.
   ![A screenshot of a computer
   
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6. **Enter the Look-Back Days** 
     1. Specify the number of days prior to the **Next Rate Change Date** that the system will use to determine the index value.
     2. *Example:* With a 45day lookback, if the next rate change is 10/1/2025, the index value as of 8/17/2025 will be used. 
        
        ![A screenshot of a computer
        
        AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-30-2025-11-55-15-0722-PM.png?width=670&height=344&name=undefined-Jul-30-2025-11-55-15-0722-PM.png)
7. **Index** (No value needed upon initial setup; this will update once you run your first-rate change.)
8. **Select the Margin**  
     1. Enter the margin to be added to the index to calculate the fully indexed rate.
9. **Optional Adjustments**  
     1. **Ceiling (Life Cap):** The maximum rate the loan can ever reach.
     2. **Floor:** The minimum rate the loan can fall to.
     3. **First Change Cap:** Limit on how much the rate can change at the first adjustment.
     4. **Periodic Cap:** Limit on subsequent adjustments.
     5. **Rounding Method and Factor:** Define how rates should be rounded.
     6. **Carryover:** Allows unused increases to carry forward into future adjustments.
10. **Set the Next Rate Change Date**  
      1. Enter the effective date when the next interest rate adjustment should occur.
11. **Select the Adjustment Frequency**  
      1. Choose the number of months between adjustments.
      2. For **conventional loans**, this is typically monthly.
      3. For **Billable Loans** (construction, commercial, line of credit), you can select **Monthly** or **Daily**.
12. **Configure Borrower Notices (Optional)**  
      1. Check **Send Change Notice** if borrowers should be notified of changes.
      2. Enter **Notice Lead Days** (commonly 30–45 days before the adjustment).
      3. Record the **First Notice Sent** date if applicable.
13. **Set Up Payment Adjustments (if applicable)**  
      1. Check the **Payment Adjustment** box to enable automatic payment recalculation in the Terms tab.
      2. **Payment Cap, Neg Amort Cap, Recast Payment, Recast Frequency, Recast Next Date, Recast Stop Date, and Recast to Date** are all optional fields, depending on loan terms.
      3. **Important:** Ensure the **Next Adjustment Date** is at least one full payment period after the Next Rate Change Date.
      4. The **Adjustment Frequency** here typically matches the rate adjustment frequency.
14. **Option ARM (Optional)**  
      1. If the loan is an Option ARM, select the box and configure the available borrower payment options: **Interest Only, Fully Amortized, 15-Year Amortized**

### **Key Fields Overview**

- **Index**: Initial rate; updated automatically by the system.

- **Margin**: Added to the index to establish the fully indexed rate.

- **Ceiling (Life Cap)**: Maximum allowable rate.

- **Floor**: Minimum allowable rate.

- **First Change Cap**: Cap on the first adjustment.

- **Periodic Cap**: Caps on subsequent adjustments.

- **Rounding Factor & Method**: Define rounding rules.

- **Next Rate Change**: Date of next adjustment.

- **Adjustment Frequency**: Months between adjustments.

- **Carryover**: Carry unused rate increases to future adjustments.

- **Payment Adjustments** (if applicable): Payment Cap, Negative Amortization Cap, Recast Rules, Option ARM options.

- **Borrower Notices**: Notice lead days, first notice sent, scheduled rate/payment change settings.

- **Look Back Days**: The number of days prior to the **Next Rate Change Date** that the index value is determined. This ensures the correct and available index figure is used for the adjustment.

For example: If the next rate change date is **10/1/2025** with a **45day lookback period**, the index value as of **8/17/2025** will be used to calculate the new rate. 

**TIP:** A longer lookback period provides more lead time for preparing borrower notices, while a shorter period uses a more current index value. 

### **Special Considerations for Billable Loans**

*(Construction, Commercial, Line of Credit)* 

When dealing with **Billable Loans**, ARM adjustments work differently: 

- **Daily Rate Tracking**: ARM adjustments are tracked daily, and daily rate changes are automatically created when billing statements are run.

![A screenshot of a computer

AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-30-2025-11-58-09-2440-PM.png?width=337&height=268&name=undefined-Jul-30-2025-11-58-09-2440-PM.png)

- **Payment Adjustment Section Disabled**: The **Payment Adjustment** section is greyed out because TMO automatically recalculates payments during billing.

- **Simplified Setup**: You only need to configure the ARM tab up to the index and adjustment parameters; payment recalculation is automated.

**TIP:** Ensure the loan is marked as **Billable** in setup so that daily rate tracking and auto-payment recalculations are enabled. 

#### **How ARM Loans Are Selected for Rate & Payment Adjustments**

- **Rate Adjustments**: Based on **look-back days** and the **next rate change date**.

- **Payment Adjustments**: Based on **next adjustment date**, **notice lead days**, and **rate change date**.
- **Combined Adjustments**: If rate and payment change at the same time, a single borrower notice is sent.

### **How to Calculate Rate & Payment Adjustments**

1. Go to **Loan Servicing → Tasks & Reports**.
2. Under **Adjustable-Rate Mortgages**, click **Calculate Rate & Payment Adjustments**.   
   ![A screenshot of a computer
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-30-2025-11-59-16-0251-PM.png?width=670&height=326&name=undefined-Jul-30-2025-11-59-16-0251-PM.png)
3. Select **All Loans** or **Selected Loans by Account**.
4. Choose **All Indexes** or a specific index. 
   
   ![A screenshot of a computer screen
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-30-2025-11-59-55-1173-PM.png?width=670&height=392&name=undefined-Jul-30-2025-11-59-55-1173-PM.png)
5. Optionally, exclude borrowers on hold or filter by categories.
6. Review the list of loans; check/uncheck as needed.
7. Click **Next → Finish**.
8. If errors occur, review the **Errors & Exceptions Report**, correct issues, and rerun.
9. If successful, TMO confirms that adjustments were added. You can validate by reviewing the ‘Scheduled Rate & Payment Changes’ on the loan file.

![A screenshot of a computer

AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-31-2025-12-00-38-8890-AM.png?width=670&height=459&name=undefined-Jul-31-2025-12-00-38-8890-AM.png)

![A screenshot of a computer

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### **How to Edit Borrower Adjustment Notices**

1. Click the **Options**.
2. Go to **Notices → ARM tab**.
3. Choose the notice type:  
     1. **Standard Notice** (non-RESPA)
     2. **RESPA Initial Notice** (210–240 days before the first change)
     3. **RESPA Regular Notice** (60–120 days before subsequent changes)
4. Click **Download** to customize in Microsoft Word (with add-in). Then **Upload** the newly edited template. 
   
   ![A screenshot of a computer
   
   AI-generated content may be incorrect.](https://help.themortgageoffice.com/hs-fs/hubfs/undefined-Jul-31-2025-12-01-37-5134-AM.png?width=670&height=451&name=undefined-Jul-31-2025-12-01-37-5134-AM.png)
5. Save changes or cancel to exit.

### **ARM Loan FAQs & Servicing Tips**

**Borrower Notices** 

- Send notices **at least 25 days before** the new payment takes effect.

- Must include borrower contact information for inquiries.

**Interest Rate & Payment Change Together** 

- Only one notice is required when both occur at the same time.

**Negative Amortization** 

- If payments don’t cover interest, unpaid interest is added to the principal balance.

**Payment Shortages** 

- Do not automatically reject; apply partial payments where possible and hold unapplied funds until a full installment is available.

**Payment Overages** 

- Handle based on amount and policy.

**Nature of Adjustment Errors** 

- May involve rate, payment, or both.

- Common causes: wrong index, wrong margin, incorrect caps, or failure to apply caps.

 

✅ **You are now equipped to set up and manage ARM loans in The Mortgage Office®** — including Billable Loans, borrower notices, rate/payment calculations, and compliance requirements. 

 

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