Who Does What in the Home Loan and Purchase Process

Buying a home involves multiple licensed professionals working simultaneously. Each role has specific responsibilities and legal limits. When buyers are unclear about who does what, they often ask the wrong person the right question, expect approvals that cannot be granted, or assume someone else is handling a critical step.

This page is designed to remove confusion by clearly explaining four roles that show up in almost every financed home purchase. The lender, the underwriter, the loan officer, and the real estate agent. Understanding how these roles differ helps buyers set accurate expectations, communicate efficiently, and avoid last-minute surprises.

The comparisons below outline each role’s responsibilities, limitations, and typical compensation.

Lender

What the lender is responsible for.

The lender provides the loan funds and takes the financial risk of making the loan. The lender establishes lending standards, applies loan program requirements, and ensures the loan meets regulatory and investor guidelines so it can be funded and supported after closing.

What the lender cannot do.

The lender cannot approve undocumented information, ignore underwriting rules, or rely on verbal assurances when documentation is required. The lender must follow published guidelines and verify the file using acceptable proof.

How the lender is paid.

The lender earns money through loan interest and lender fees. Specific fee structures vary by lender and loan program.

Underwriter

What the underwriter is responsible for.

The underwriter reviews the loan file and makes the final approval decision based on documented facts. The underwriter verifies income, assets, credit, and employment, and confirms that the file is complete, consistent, and supportable under the applicable loan guidelines.

What the underwriter cannot do.

The underwriter cannot accept explanations without documentation, make exceptions based on emotion or urgency, or approve a file that cannot be supported on paper. Underwriters also typically do not communicate directly with buyers because communication is routed through the lender and the loan officer.

How the underwriter is paid.

Underwriters are typically salaried employees or contractors paid by the lender. They do not earn commission based on loan size or outcomes.

Loan Officer or Mortgage Loan Originator (MLO)

What the loan officer is responsible for.

The loan officer collects information, explains options, structures the loan request, and prepares the file for underwriting review. The loan officer serves as the main point of contact for the borrower and helps coordinate documentation requests and conditions so the file can move forward.

What the loan officer cannot do.

Loan officers cannot approve the loan or override an underwriter’s decision. They cannot replace documentation with verbal explanations. They also cannot verify employment or income independently in a way that substitutes for the lender’s verification process.

How the loan officer is paid.

Loan officers may be paid a salary, commission, or a combination. Compensation varies by lender and loan size, and is subject to lending compliance rules.

Real Estate Agent or Realtor

What the Realtor is responsible for.

The Realtor represents the buyer or seller in the real estate transaction. The Realtor advises on pricing, strategy, timing, negotiation, contract terms, and coordinates showings, offers, escrow timelines, and communication across parties involved in the sale.

What the Realtor cannot do.

Realtors cannot approve financing, verify income or employment, or request confidential borrower information from employers, banks, or the buyer’s lender. Realtors also cannot speak to the underwriter directly about a buyer’s loan file unless they are authorized within the lending process, which is not typical.

How the Realtor is paid.

Realtors are typically paid a commission only when the transaction closes. The commission is negotiated in the representation agreement and is paid from the transaction proceeds.

Why this matters in real life

Many stressful moments during a transaction come from assuming that one role can do another role’s job. Buyers may expect the Realtor to confirm loan qualification, expect the loan officer to override underwriting rules, or assume the underwriter can expedite the process because the closing date is approaching.

When each role is clearly understood, questions go to the right person, timelines become more predictable, and fewer surprises arise late in escrow.

Clarity is not about limitation. Clarity is about smoother outcomes.