How Much PMI Adds to a Conventional Loan by Credit Tier

The Quick Read: Credit tier changes the cost of PMI a lot, and no agency publishes the price. Private mortgage insurers set it on their own rate cards, using your credit score and your loan-to-value ratio (LTV). A higher score at the same LTV generally means a cheaper monthly add-on. A lower down payment pushes the cost up, and so does a lower score. The agencies only decide when PMI is required, how much coverage the insurer must carry, and when it ends.

What Does PMI Actually Do?

PMI is insurance that protects the lender, not you. The CFPB explains that you may be required to buy it on a conventional loan when your down payment is under 20% of the purchase price. It also usually applies to a conventional refinance when your equity is under 20%.

On a purchase, the trigger is the loan-to-value ratio. Fannie Mae’s Selling Guide requires mortgage insurance on a conventional first mortgage above 80% LTV, unless the lender uses another approved credit enhancement. The LTV uses the lower of the sales price or the appraised value. If the appraisal comes in above the price, you do not get a lower LTV out of it. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.

Here is the file-level reality across the wholesale programs we place files with. On a principal residence, a standard purchase can go to 95% LTV (5% down). A first-time buyer with a fixed rate can go to 97% LTV (3% down). Both sit above 80%, so both carry PMI. Every one of those loans is subject to lender guidelines and full file review.

Who Sets the Price, and What Does the Credit Score Do?

The insurer sets the price. The lender passes it through. No agency guide lists a PMI price by credit tier, so any chart that claims to is copying an insurer’s rate card, and those cards change and differ by company.

Two things drive the premium on a rate card:

• Credit score. The insurer uses one “representative” score. A higher tier costs less.
• LTV band. A smaller down payment means more risk, so the premium climbs.

The pattern holds across insurers: premiums rise as scores fall and as down payments shrink. The gap between the best tier and the weakest tier at the same LTV is wide. Published typical annual premiums run from 0.58% to 1.86% of the loan balance. That is a range, not a quote. Where you land inside it depends on your score and your LTV, and only a Loan Estimate from a lender shows your actual number.

Wholesale conventional programs start at a 620 decision score. A borrower near that floor sits in the most expensive tier on the card. A borrower well above it sits near the bottom of the range.

How Is the Loan Underwritten, Step by Step?

This is the order a conventional purchase file moves through when PMI is in play.

1. The LTV gets set. The lender takes the lower of price or appraised value and compares it to the loan amount. Above 80%, mortgage insurance is needed.

2. One credit score is chosen. Fannie Mae’s guide defines a “representative” score. With more than one borrower, the agency pricing matrix has its own handling, so ask the loan officer which score the file is using.

3. The coverage level is set. Coverage is the share of the loan the insurer would cover if you default. It is not the premium. Under Fannie Mae’s standard coverage rules for fixed-rate terms over 20 years, required coverage steps up with LTV: 12% for 80.01–85%, 25% for 85.01–90%, 30% for 90.01–95%, and 35% for 95.01–97%. HomeReady uses lower coverage in the higher bands.

4. The insurer prices that coverage. The score and LTV go into the insurer’s grid. That grid gives the premium.

5. The premium plan is chosen. More on this below.

6. Disclosure happens. The Homeowners Protection Act requires written notice of how lender-paid and borrower-paid PMI differ.

7. The deal works on a Loan Estimate and Closing Disclosure. Both show the mortgage insurance line. Compare the two.

Coverage and premium are different things. A higher coverage level in the 95–97% band does not mean you “get more.” It means the insurer is carrying more risk, which is why the premium is higher there.

Does Credit Cost You Twice?

Yes. Credit shows up in two places on a conventional loan.

First is the insurer’s premium, as above. Second is a separate agency cost. Fannie Mae publishes a Loan-Level Price Adjustment Matrix, which sets price adjustments from credit score, LTV, loan purpose, occupancy and product type. The matrix uses the representative score, and the adjustments stack. It is re-dated from time to time, so this article does not quote its percentages.

That is why a lower tier hurts more than the PMI line alone suggests. The weaker score raises the mortgage insurance premium and also raises the loan-level adjustment priced into the loan. Compare the full cost on the Loan Estimate, not the PMI line by itself.

A Fannie Mae minimum-coverage option exists too. A lender may deliver less than standard coverage, down to a stated minimum. When it does, an additional mortgage-insurance-related adjustment applies on top of the others. Less coverage is not automatically cheaper once that is counted.

Credit Tier or Down Payment: Which Moves the Cost More?

Often the credit tier. The premium grid has two axes, and a jump of one full tier can outweigh moving from one LTV band to the next. But it depends on where you start.

Think about three borrowers, described in percentages and plain words only:

• A buyer with a strong score putting 5% down. This buyer sits at 95% LTV but in a low-cost tier. PMI is real but sits toward the lower end of the range.
• A buyer with a midrange score putting 5% down. Same LTV, but a weaker credit tier. The premium sits noticeably above the first buyer’s.
• A buyer with a weak score putting 3% down. Highest LTV band and the weakest credit tier. This is the corner of the grid with the highest premium. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.

Now run two moves. If the second buyer lifts the score into the higher tier, the premium falls at the same down payment. If the second buyer instead adds a few points of down payment, the premium falls too, but only if the extra cash moves the loan into a lower LTV band. Both help. Which one helps more depends on the insurer’s grid, so the practical test is simple: ask the loan officer for the quote at your current score, then at the next tier, then at the next LTV band. That comparison is the real answer for your file.

One caution. Financed mortgage insurance changes the math. When the premium is financed, Fannie Mae’s guide says coverage is based on the LTV after the premium is added. A financed premium can push you into a higher band. Not ideal.

Which Premium Plan Fits Which Tier?

There are three structures.

Lender-paid PMI is not free. It usually carries a higher interest rate and cannot be cancelled by the borrower or terminated automatically. If you expect to stay in the loan for years, a PMI line you can cancel often matters more than a lower-looking monthly figure. For weaker credit tiers the single-premium and lender-paid options are worth pricing, but ask for the comparison side by side on the Loan Estimate rather than assuming either wins.

How Does PMI End?

The federal rules are specific, and they trip people up.

• Request at 80%. You can ask the servicer to cancel when the balance is scheduled to reach, or actually reaches, 80% of the home’s original value. The CFPB’s HPA procedures lay this out. Good payment history, no subordinate liens and no decline in value are the usual conditions.
• Automatic at 78%. The servicer must terminate it on the date the balance is first scheduled to reach 78% of original value, if you are current.
• Midpoint backstop. PMI must end the month after the midpoint of the amortization schedule.

Extra payments do not move the automatic date. It runs off the original schedule. If you prepay down to 80%, you have to ask. Same goes for 80% itself. It is a right to request, not an automatic event.

The high-risk loan exception exists too. The 80% and 78% rules do not apply to loans the agencies define as “high risk,” which fall under a different termination rule.

Where Does the General Rule Break?

Several edge cases change the answer.

Occupancy and units. Under Fannie Mae’s servicing rules, automatic termination at 78% applies to one-unit principal residences and second homes. Two- to four-unit primary residences terminate automatically only at the midpoint of the original schedule. Borrower-requested cancellation on original value is 80% for a one-unit primary residence or second home, and lower for the multi-unit cases. A buyer financing a two- to four-unit principal residence at up to 95% LTV should read the cancellation terms before closing, not after. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.

Cancelling on current value. Insurer summaries of the agency guides describe cancellation based on today’s value rather than original value, with a seasoning requirement and a higher bar for the first few years. Per an insurer’s summary of the agency guides, the thresholds are tighter than the original-value rule. Verify the exact terms against the servicing guide with your servicer, since an insurer’s summary is not the guide itself.

A value that dropped. If a new valuation shows the current value below original value, the servicer can deny the request. Fannie Mae’s lender letter requires the denial notice in writing after the valuation is received.

Fannie Mae versus Freddie Mac. The two agencies do not always use the same thresholds on multi-unit and other non-standard cases. The servicer follows whichever agency owns the loan. Ask who that is.

FHA and USDA. Those loans carry their own mortgage insurance, a different product with different rules. Do not apply the PMI cancellation rules above to them.

Low-down-payment programs. HomeReady and Home Possible carry an income limit of 80% of area median income, and HomeReady reduces required coverage in the higher LTV bands. Check the current eligibility terms before counting on that.

Can You Move Up a Tier Before You Apply?

Sometimes. The honest answer is that a few levers are in your control and a few are not.

• Pay down revolving balances. Utilization is the fastest-moving part of a score, and the change shows up once the balances report.
• Correct errors. A wrong late payment or a wrong balance on a report is worth disputing before the lender pulls credit.
• Hold off on new accounts. New credit inquiries and new accounts before a purchase can pull the score the wrong way.
• Check how close you are to a boundary. If your score sits just under a tier line, a small move may be worth waiting for. If you are far from the next tier, waiting may cost more in rent and price movement than it saves.

That last point is the break-even test. Ask the loan officer for two quotes: one at today’s score and one at the next tier. Then weigh the monthly PMI difference against what a delay costs you. No chart answers it for you.

Credit events matter too. The agencies set waiting periods: four years from a chapter 7 discharge, seven from a foreclosure, and four from a short sale or deed-in-lieu, shorter with documented extenuating circumstances. Those are agency rules, not lender preferences.

How Much Does PMI Matter Next to Everything Else?

It is one line in a larger file. The same wholesale programs carry a total debt-to-income ceiling of 50% on the automated finding, and manually underwritten loans run tighter at 36% or 45%. PMI is part of the monthly payment, so a higher premium eats into that ratio. Borrowers close to the ceiling feel it first.

That ties the credit tier to approval, not just cost. A lower tier raises the payment, and a higher payment can push the ratio past what the automated finding will take. For buyers weighing a conventional loan against other routes, it is worth asking for the all-in payment at your actual score, not a generic estimate. Lendmire’s cash-out piece covers how the same credit and equity tiers work if you later tap equity.

Key Terms Defined

PMI (private mortgage insurance): Insurance on a conventional loan with under 20% down that protects the lender if you default. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.

LTV (loan-to-value): The loan amount divided by the lower of price or appraised value.

Credit tier: The score band an insurer uses on its rate card to set your premium.

Representative score: The single score the lender uses to price the loan when there are several.

Coverage: The share of the loan the insurer would cover. It is set by LTV band and is not the premium.

LLPA (loan-level price adjustment): An agency price add-on based on credit score, LTV and loan features, separate from PMI.

What to Do Next

If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file. Program figures are subject to lender guidelines and full file review, and nothing here is a commitment to lend.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

Lendmire is a mortgage brokerage (NMLS# 2371349) licensed for consumer mortgage lending in 16 states, arranging FHA, VA, conventional and jumbo purchase and refinance loans through a wholesale lending network. Eligibility is determined by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB – What is private mortgage insurance?

2. Fannie Mae Selling Guide B7-1-01

3. Fannie Mae Selling Guide B7-1-02

4. Loan-Level Price Adjustment Matrix

5. Fannie Mae’s guide

6. CFPB – Homeowners Protection Act examination procedures

7. Fannie Mae Servicing Guide B-8.1-04

8. Enact MI – Fannie/Freddie cancellation summary