How to Write a Mortgage Refinance Analysis with AI in 2026

A strong refinance analysis does three things: it shows the borrower the numbers in a way they can actually understand (monthly payment, lifetime interest, break-even month), it documents which loan scenario the broker is recommending and why (rate-and-term vs cash-out vs term reduction), and it flags the assumptions so the borrower knows what changes if rates move or fees shift. Refinance conversations live or die on the break-even math and the clarity of the trade-off explanation. AI is excellent at producing the structural and language layer of that analysis in under five minutes. The numbers, the rate-sheet quotes, and the recommendation about which scenario actually fits the borrower — those are yours.

This is a practical walkthrough for writing a refinance analysis with AI that the borrower trusts and that holds up under compliance review.

What a strong refinance analysis contains

Before you can use AI well, you need to know what good looks like:

• Header block — brokerage / lender name, NMLS number, borrower name, property address, analysis date, valid-through date
• Current loan snapshot — current balance, current rate, current monthly P&I, remaining term, original loan date, current servicer
• Refinance scenario(s) — for each option: new loan amount (including closing costs if rolled in), new rate, new term, new monthly P&I, points/fees, APR
• Side-by-side comparison — current vs each scenario across monthly payment, lifetime interest, total interest paid to date, total interest remaining
• Break-even analysis — total closing costs ÷ monthly savings = break-even month; how long the borrower needs to stay in the home for the refi to make financial sense
• Cash-out detail (if applicable) — funds received at closing, what the borrower stated the funds are for, impact on LTV, impact on lifetime interest
• Assumptions — rate lock period, rate quoted as-of date, fees subject to final loan estimate, no escrow analysis included unless specified
• Recommendation — the broker's recommended scenario with one-line reasoning tied to the borrower's stated goals
• Required disclosures — language pointing to the official Loan Estimate as the binding document; this analysis is illustrative only
• NMLS identifiers — broker NMLS, company NMLS, equal housing language

Borrowers who say yes to a refinance are the ones who understand the break-even and trust the recommendation. AI handles the structural and language layer; you provide the rates, fees, and the judgment about which scenario actually serves the borrower.

The right prompt structure

The mistake most brokers make on first try is asking for "a refi comparison" with just rates. The prompt that actually works gives the AI the full numerical picture, the borrower's goals, and the recommended scenario:

<task>Write a refinance analysis for a borrower.</task>

<context>
Brokerage: Acme Mortgage Group, NMLS #XXXXXX
Loan officer: [LO NAME], NMLS #XXXXXX
Borrower: [BORROWER NAME placeholder]
Property: [PROPERTY ADDRESS placeholder], owner-occupied SFR
Analysis date: May 21, 2026; rates quoted as-of May 21, 2026; analysis valid 5 business days

Current loan:
- Balance: $385,000
- Rate: 7.125% (30-year fixed, originated June 2023)
- Monthly P&I: $2,594
- Remaining term: 27 years, 1 month
- No prepayment penalty

Borrower goals (from intake call):
- Reduce monthly payment ("cash flow is tight after the property tax reassessment")
- Plans to stay in the home long-term (10+ years)
- Not interested in cash-out
- Concerned about closing costs

Scenario A (rate-and-term, 30-year fixed):
- New loan: $390,000 (closing costs rolled in)
- Rate: 6.250%
- Term: 30 years
- New P&I: $2,402
- Monthly savings: $192
- Total closing costs: $5,000 (rolled into loan)
- Break-even: $5,000 / $192 = 26 months
- Lifetime interest on new loan: $474,720

Scenario B (rate-and-term, 25-year fixed — matches remaining term):
- New loan: $390,000
- Rate: 6.125%
- Term: 25 years
- New P&I: $2,544
- Monthly savings: $50
- Lifetime interest on new loan: $373,200 (vs. $456,000+ remaining on current loan)
- Better for total interest reduction, smaller monthly savings

Recommendation: Scenario A
Reasoning: Borrower's primary stated goal is monthly cash flow relief, not lifetime interest minimization. Break-even at 26 months is well within their 10+ year time horizon.
</context>

<instructions>
- Tone: professional, plain-English, not salesy
- Structure: header, current loan snapshot, scenarios in a side-by-side format, break-even, recommendation with reasoning, assumptions, official Loan Estimate disclosure
- Use placeholders [BORROWER NAME], [LO NAME], [PROPERTY ADDRESS]
- Round payment numbers to the dollar; show rate to 3 decimal places
- Explicitly note: this is an illustrative analysis; the official Loan Estimate (TRID-compliant) governs final terms
- Include NMLS numbers and Equal Housing Lender language
- 600 words maximum
</instructions>

<avoid>
- Inventing rates, fees, or terms not in the context
- Promising rate availability or rate locks not yet executed
- Promising the borrower will save a specific lifetime dollar amount (depends on staying in the loan that long)
- Comparing to other lenders' rates not in this context
- Skipping the Loan Estimate disclosure
- Selling against the borrower's stated goal (don't push cash-out when they said no cash-out)
</avoid>

The structure: the borrower's current loan, the scenarios with all the numbers, the borrower's stated goals, the recommended scenario, and explicit instructions about what NOT to invent. The AI produces the analysis; you provide the rates, the math, and the recommendation.

What to never let AI do

Invent rates, fees, or APRs. Every rate, point, and fee in the analysis must come from your actual rate sheet or pricing engine. AI will produce plausible-sounding numbers if you don't constrain it. Numbers in a refinance analysis become the borrower's expectation; mismatches with the Loan Estimate erode trust and create compliance exposure.

Calculate APR or QM points-and-fees thresholds. APR calculation under Reg Z and the QM points-and-fees test (3% over $100K thresholds, etc.) are highly specific calculations. Use your LOS or pricing engine for the official figures; the AI can quote them in the document but should not derive them.

Promise lifetime savings the borrower may not realize. "You'll save $84,000 over the life of the loan" is true only if the borrower keeps the loan for the full term. Frame lifetime numbers as conditional on the borrower's stated timeline.

Substitute for the Loan Estimate. The Loan Estimate is the TRID-compliant binding disclosure. The refinance analysis is an illustrative pre-application document. Every analysis should include the language that the LE governs final terms.

Recommend cash-out for a borrower who said no cash-out. AI may default to "consider also a cash-out option" because cash-out is a common refinance type. Respect the borrower's stated goals.

Skip NMLS identifiers and Equal Housing language. These are required by federal and state regulations on broker communications. AI may omit them; you put them back in.

Common mistakes

Break-even calculated without rolled-in closing costs. If the borrower is rolling closing costs into the loan, the break-even should account for the new principal, not just out-of-pocket cash. Be explicit about which.

Comparing apples to oranges on term. Comparing a current 30-year mortgage to a new 30-year mortgage understates the lifetime interest cost of refinancing (clock resets). Show both the rate-and-term-matched scenario and the new-30-year scenario so the borrower sees both pictures.

Missing the rate-as-of date. Rates move daily. A refinance analysis dated May 21 with rates as-of May 14 is not the borrower's actual quote. Date the rate quote explicitly.

Treating monthly savings as guaranteed. PMI, escrow, taxes, and insurance changes affect actual monthly payment. P&I-only savings is the number to feature; total monthly payment changes are noted separately.

No recommendation. A "here are three scenarios, pick one" analysis leaves the borrower confused. A "based on your stated goal of [X], I recommend Scenario [Y]" analysis closes the conversation.

What to never put in a refinance analysis without consideration

• Rates locked or quoted that are not currently available from the lender
• Rate predictions ("rates are expected to drop further") — that's a market call, not a broker promise
• Tax or financial-planning advice (whether the borrower should use cash-out proceeds for X, Y, or Z)
• Comparison to a competitor's rate not currently in writing
• Statements that contradict the Loan Estimate the borrower will later receive

These aren't AI-specific risks — they apply to any refinance communication. AI can produce them quickly without flagging the risk; the broker's review step is where they get caught.

The free tool that handles this for you

If you don't want to engineer the prompt every time, the Refinance Analysis Builder on AI Career Lab is pre-configured for the structure that holds up under compliance review. It produces analyses with the elements above, in the plain-English tone borrowers understand.

Pair it with the Pre-Approval Letter Drafter for purchase-side communications, the Rate Comparison Generator for multi-lender comparisons, and the Pipeline Status Update for keeping borrowers, realtors, and processors aligned through close.

Free with an AI Career Lab account, capped at five runs per day on the free tier.

Try it on your next refi inquiry

Pick the next refinance inquiry sitting in your pipeline. Pull the current loan from your LOS, pull the scenarios from your pricing engine, document the borrower's stated goal, and run the inputs through the tool above. Compare to the analysis you'd write by hand — note how much faster it goes out and how much cleaner the break-even and recommendation read.

Create your free AI Career Lab account and try the mortgage broker tools today. No credit card.

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This article is general guidance for licensed mortgage professionals. AI-generated refinance analyses are illustrative starting drafts requiring loan officer review for rate, fee, and term accuracy. The official Loan Estimate (TRID-compliant) governs final loan terms. Mortgage brokers and loan officers must comply with TRID, Reg Z, Reg B (ECOA), state licensing requirements, and NMLS standards in all borrower communications. This article does not constitute compliance advice; consult your compliance team or counsel.