| LOS | Loan Origination System |
| POS | Point of Sale (loan application front end) |
| AUS | Automated Underwriting System (e.g., DU or LP) |
| DU | Desktop Underwriter (Fannie Mae AUS) |
| LP | Loan Product Advisor (Freddie Mac AUS) |
| CRM | Customer Relationship Management (borrower pipeline tracking) |
| HMDA | Home Mortgage Disclosure Act (data collected at application) |
| U/W | Underwriting |
| DTI | Debt-to-Income Ratio |
| LTV | Loan-to-Value Ratio |
| CLTV | Combined Loan-to-Value |
| FICO | Fair Isaac Corporation (credit score) |
| VOD | Verification of Deposit |
| VOE | Verification of Employment |
| VOR | Verification of Rent |
| PFS | Personal Financial Statement |
| DSCR | Debt Service Coverage Ratio |
| TRID | TILA-RESPA Integrated Disclosure Rule |
| TILA | Truth in Lending Act |
| RESPA | Real Estate Settlement Procedures Act |
| LE | Loan Estimate |
| CD | Closing Disclosure |
| ECOA | Equal Credit Opportunity Act |
| CRA | Community Reinvestment Act |
| FCRA | Fair Credit Reporting Act |
| BSA/AML | Bank Secrecy Act / Anti-Money Laundering |
| KYC | Know Your Customer |
| OFAC | Office of Foreign Assets Control |
| GFE | Good Faith Estimate (historical; replaced by LE) |
| TLTV | Total Loan-to-Value |
| HUD-1 | Settlement Statement (legacy) |
| UCD | Uniform Closing Dataset |
| MERS | Mortgage Electronic Registration System |
| ABA | American Bankers Association (wire instructions) |
| MSR | Mortgage Servicing Rights |
| P&I | Principal and Interest |
| PMI | Private Mortgage Insurance |
| MIP | Mortgage Insurance Premium (FHA) |
| ARM | Adjustable-Rate Mortgage |
| FNMA | Fannie Mae |
| FHLMC | Freddie Mac |
| HUD | Housing and Urban Development (FHA/VA loans) |
| SBA | Small Business Administration (loan guarantor) |
| API | Application Programming Interface (LOS integrations) |
| XML | Extensible Markup Language (data transfers) |
| UAD | Uniform Appraisal Dataset |
| ULDD | Uniform Loan Delivery Dataset |
| MISMO | Mortgage Industry Standards Maintenance Organization |
