The Quick Read: A Letter of Map Amendment lowers the flood cost in a DSCR calculation only when it ends the flood coverage requirement and the lender accepts it, because the ratio improves by roughly the flood premium’s share of the total monthly payment while the rent stays exactly where it was. The gain is large on thin files with heavy premiums. It is close to zero when coverage stays on the loan.
- The letter does not change the ratio by itself. Removing the flood line from the payment does.
- The improvement scales with the flood premium’s share of the payment, so a bigger premium means a bigger lift.
- Acceptance is the lender’s call, and a pending letter does not count at closing.
- A letter reduces the paper cost, not the physical flood risk.
Key Terms Defined
DSCR (debt service coverage ratio): monthly rent divided by the monthly payment the lender counts, which shows whether the rent covers the loan.
PITIA: principal, interest, taxes, insurance, and association dues, the full monthly obligation in the DSCR denominator.
LOMA (Letter of Map Amendment): an FEMA letter saying one existing structure or parcel sits on naturally high ground and would not be flooded by the base flood.
LOMR-F (Letter of Map Revision based on Fill): the related FEMA letter for property whose ground was raised with fill.
Base flood elevation (BFE): the water height expected in a flood with a 1% chance of happening in any year.
Lowest adjacent grade (LAG): the lowest ground touching the structure.
Special Flood Hazard Area (SFHA): a mapped high-risk zone, with zone names starting with A or V.
Elevation certificate: a surveyor’s record of a building’s elevation measurements.
CLOMA: a conditional letter that comments on a planned project and does not remove any requirement.
DSCR Calculator
Run the numbers in your market
Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 29, 2026
Prefilled with starting assumptions — enter your own rent or nightly figures, taxes, insurance, and HOA for a more accurate picture.
Program parameters update from Lendmire’s centralized guideline source. Taxes and insurance are editable estimates.
As of Oct 29, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Rent, nightly rate, occupancy, taxes, and insurance are editable estimates. Short-term rental figures are estimates only and vary significantly by season, property type, management approach, and local short-term-rental rules — confirm local regulations before relying on them. Qualifying income for short-term rentals varies by program — some use appraisal market rent, others use documented STR history or projections — and is confirmed in underwriting. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
What Is an LOMA, and What Is It Not?
An LOMA is a one-property determination, not a map redraw. FEMA describes it as a letter stating that an existing structure or parcel is on naturally high ground, has not been raised by fill, and would not be flooded by the base flood. FEMA adds that if the change is granted, the owner may no longer be required to carry flood insurance.
The test is simple. The lowest ground touching the building must sit at or above the base flood elevation, according to FEMA’s LOMA and LOMR-F process page. For a request based on a lot, the lowest point on that lot must clear the same bar.
Three things an LOMA is not:
- It is not a change to the community’s flood map. The map stays as published, and the letter applies to your structure only.
- It is not a LOMR-F. If someone raised the grade with fill, you use the LOMR-F route instead, and FEMA charges a review fee for it.
- It is not an elevation certificate. The certificate is evidence you may submit with the request. It does not change anything on its own.
FEMA charges no review fee for a LOMA. The cost is the survey or elevation data you gather and the time the review takes. FEMA’s pages do not state a typical turnaround, so plan on an unpredictable wait.
How Does Flood Insurance Get Into the DSCR Math?
Flood insurance lands in the denominator. Rent does not move, so the ratio falls.
The lender orders a flood determination at application. If the property sits in a Special Flood Hazard Area, the file needs flood coverage. The lender divides the annual flood premium by 12 and adds it to the insurance line of the monthly payment. Rent is the numerator and the full payment is the denominator, so a larger payment pulls the ratio down.
Here is the scaling rule in plain words. The new ratio equals the old ratio divided by one plus the added cost as a share of the existing payment. A flood quote that adds 25% to the payment turns a 1.25x file into a 1.00x file. That is the whole mechanism.
An LOMA works that arithmetic in reverse. If the letter ends the requirement and the lender drops the flood line, the payment shrinks back and the ratio recovers.
How Much Does the Ratio Actually Improve?
The ratio improves by a factor of one divided by (one minus the flood premium’s share of the current payment). No dollar saving is typical, because premiums depend on the individual property. The table works in shares and ratios instead.
Read it this way. The first column is the flood premium’s share of the total monthly payment while coverage is counted. The next two columns show the ratio after the flood line is removed, for a file that was at 1.00x or at 1.10x with flood included.
| Flood share of payment | From 1.00x with flood | From 1.10x with flood |
|---|---|---|
| 5% | about 1.05x | about 1.16x |
| 10% | about 1.11x | about 1.22x |
| 15% | about 1.18x | about 1.29x |
| 20% | about 1.25x | about 1.38x |
These are illustrative modeled shares, not market data. Your own file will land somewhere on this spectrum based on the actual quote.
A few patterns stand out. A small premium on a high-rent property barely moves the number. A heavy premium on a modest-rent property can move a file across a pricing or leverage tier. The effect is largest where the file was already tight.
One honest limit sits on top of the math. The table shows what happens when the flood line disappears. If the lender still requires coverage, the ratio does not move at all.
Step by Step: From Flood Determination to a Recalculated Ratio
The sequence matters more than most investors expect. Here is how it runs on a typical file:
1. The determination. The lender orders a flood determination. If the property is in a mapped high-risk zone, flood coverage goes into the file.
2. The premium enters the payment. The monthly share of the annual premium is added to the insurance line, and the ratio is calculated with it.
3. You gather the data. FEMA says the applicant submits elevation information on its single-structure form, or a multi-structure package or online application for several buildings or lots. An elevation certificate showing the lowest adjacent grade can be submitted instead, per FEMA’s LOMA and LOMR-F process page. If the data shows the structure is already outside the mapped area, no elevation data is needed.
4. FEMA issues its determination. The letter names the address and map panel. It applies only to that structure.
5. You give the letter to the lender. The lender decides whether to remove the requirement. Only then is the flood line pulled out of the payment and the ratio recalculated.
6. You cancel and collect. FEMA says the policyholder may get a refund of the current policy year’s premium if the lender waives the requirement and no claim was paid or is pending, as FEMA’s Online LOMC FAQ explains. You submit the letter and the lender’s waiver to your insurance agent.
Four things decide the outcome. First, whether the lowest adjacent grade is at or above the base flood elevation. Second, whether the lender accepts the letter. Third, whether the letter is issued before closing. Fourth, how big the flood premium is compared with the whole payment.
Three Ways a File Can Play Out
The ratio depends on which of three paths your file takes. The comparison below shows the difference.
| Path | Flood line in payment? | Effect on the ratio |
|---|---|---|
| No letter, coverage required | Yes | Ratio carries the full premium |
| Letter accepted, coverage dropped | No | Ratio recovers by the premium’s share |
| Letter accepted, coverage kept voluntarily | Often yes | Little or no improvement |
The third path surprises people. Say you win the letter but keep a policy because you want the protection. Many lenders count any policy that is actually in force, so the premium may stay in the payment. Whether a particular lender counts a voluntary policy is something to confirm on your file, not something to assume.
There is also a premium effect to understand. Under FEMA’s Risk Rating 2.0, flood zones no longer set the price of a federal flood policy. Pricing instead reflects property-specific features, including distance from water, flood frequency, foundation type, and the height of the lowest floor relative to the base flood elevation.
The practical result is that a LOMA’s main value is ending the requirement, not triggering a zone-based price cut. If you keep coverage, the new premium reflects your property’s own risk. It may not fall much.
DSCR vs. conventional financing
There are two common ways to finance an investment property, and they qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
Where the General Rule Breaks
An LOMA is not a switch that turns the flood line off. Here are the named edge cases.
The lender can still say yes to coverage. FEMA states that the letter eliminates the federal purchase requirement for federally backed financing, and that a lender keeps the right to require flood insurance anyway. DSCR loans are non-QM business-purpose loans placed with investor lenders. How a particular lender treats a letter is set by its own guidelines. Across the wholesale network Lendmire places files with, handling varies by lender, so ask before you count on the savings.
Fill changes the route. If the grade was raised by fill, the LOMA path does not apply. You use the LOMR-F, which carries an FEMA fee, and certified as-built data is required.
Conditional letters do not count. FEMA’s FAQ says a CLOMA, CLOMR-F, or CLOMR does not remove the purchase requirement. A conditional letter only comments on a proposed plan.
A pending letter does not help at closing. If the letter is not issued before closing, flood coverage is bound and counted in the payment. Cancellation and any refund come afterward. No source supports treating a pending application as if it were granted.
New maps can undo an old letter. When FEMA publishes a new map, an existing LOMA may stay valid if the property remains above any new base flood elevation. That is not automatic. A letter from years ago is not a permanent shield.
Private flood coverage adds another variable. If coverage stays in place under a non-federal policy, the lender’s rules on private flood policies apply. Premium and acceptance can differ from a federal policy.
Ineligible property types stay ineligible. An LOMA does nothing for a property the programs do not offer, such as manufactured homes, log homes, or barndominiums. Those fall outside the network’s DSCR programs regardless of flood status.
Is Pursuing an LOMA Worth It?
It is worth pursuing when three conditions line up. The ground clears the base flood elevation, the flood premium is large compared with the rent, and the lender will actually drop the requirement. When all three hold, the effort is cheap compared with the lift.
Think of it as a break-even question. The cost is the survey or elevation data plus your time, since FEMA charges nothing for the review. The benefit is a lower flood premium, which raises the coverage ratio the lender calculates at closing. A file that barely misses its target at 1.00x can gain real room.
That room can matter in a few ways. Most files on a purchase land at 75% to 80% LTV on an investment property, and a stronger ratio helps the pricing and leverage conversation. For a cash-out refinance, leverage tops out around 75% LTV on a standard rental, and 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00 with leverage and terms adjusted. A stronger ratio keeps you on the broader set of paths.
Reserves get a second-order lift too. Lenders commonly ask for about six months of PITIA in reserves, stepping up to about nine months on loans above $1,500,000, and some conservative files see them waived. A smaller payment means a smaller reserve target. A larger down payment helps in a similar way by lowering the payment, but it never erases credit floors, leverage caps, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
Timing is the part to plan ahead. Get the flood question answered before you commit to a property, not after.
What If the LOMA Is Denied or Delayed?
You still have levers. None of them is as clean as a granted letter, but each can help.
- Get a real quote early. A flood quote on the actual property replaces a guess. The premium varies widely by structure.
- Compare coverage options. Different policies and deductibles produce different premiums. Private flood may price differently from a federal policy, subject to lender acceptance.
- Adjust the deal. A lower price, a larger down payment, or a different property can restore the ratio.
- Use the select-lender path. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted.
- Rethink the property. Sometimes the better move is the property two doors from the flood zone.
What DSCR Does Not Capture
Even a granted letter leaves flood risk in place. FEMA treats the outcome as reduced risk, not no risk, and recommends keeping coverage anyway. A building that sits above the base flood elevation can still flood.
The ratio also leaves out the costs of ownership. DSCR compares rent to PITIA only. Clearing 1.00x is not the same as positive cash flow, because repairs, vacancy, management, utilities, flood deductibles, and capital costs sit outside the calculation. Dropping a policy lifts the number on the page and shifts that risk onto your balance sheet.
Tax treatment varies; consult a qualified professional.
For the broader mechanics of how rent, payment, and leverage fit together, see the complete DSCR loans guide.
Frequently Asked Questions
Does an LOMA automatically remove flood insurance from my DSCR loan?
No. The letter ends the federal purchase requirement, and the lender keeps the right to require coverage anyway. The letter helps only if the lender accepts it and removes the flood line. Confirm lender handling before you count on the savings.
Can I cancel flood insurance after closing once the LOMA arrives?
Often yes, if the lender waives the requirement. The policyholder can receive a refund of the current policy year’s premium when no claim was paid or is pending. You submit the letter and the lender’s waiver to your agent. The ratio on your closed loan does not change, but your actual monthly cost does.
Does a conditional letter or an elevation certificate by itself help?
No. A CLOMA or similar conditional letter does not remove the requirement. An elevation certificate is evidence you can submit with a request, not a determination on its own.
Does voluntary coverage after an LOMA still count in the ratio?
Frequently it does, because many lenders count any policy in force. Treat it as a lender-by-lender question and ask before you decide to keep or drop the policy.
If the property is not in a flood zone, does flood insurance still matter?
It can matter, because flood risk exists outside mapped zones, and FEMA recommends coverage after a LOMA. Insurance is a real operating cost that the DSCR ratio does not reflect.
If you are buying or refinancing a rental property and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage brokerage specializing in DSCR investor loans, helping arrange financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. The model centers on property-level rental income reviewed by the lender rather than W-2 documentation, subject to lender guidelines, suiting entity-owned and multi-property investors. Lendmire holds Scotsman Guide Top Mortgage Workplace recognition for 2025 and 2026.
Get Started
Ready to find the right loan for you?
See your offer in seconds. No credit pull, no obligation.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. FEMA – Change Your Flood Zone Designation
2. FEMA – LOMA and LOMR-F Process
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Much a Jumbo DSCR Refinance Lends on a Former Home · How Much Rent a DSCR Lender Counts When the Lease Is Missing · How Much a Weaker Co-Buyer Credit Score Costs a DSCR Borrower
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.