How a Bank Statement Lender Counts Casita Rent for a First-Time Buyer

The Quick Read: A bank statement lender usually treats casita rent as a separate, property-level question. It is not part of the deposit average that sets your qualifying income. Whether it adds buying power depends on the program, your occupancy, and how well you document the unit. On many files the rent works as a cushion, not as income.

How a Bank Statement File Is Built

A bank statement loan is reviewed around documented income under the applicable program, subject to lender guidelines. Across the wholesale network, the core document is 12 months of statements, business or personal. The lender totals your eligible deposits, then divides by the number of months.

Business statements usually get an expense factor. The lender assumes part of your deposits went to running the business and counts only the rest. Personal statements often skip that factor. The factor itself varies by lender, and an accountant-prepared ratio can sometimes support a different one. Nobody can promise you a universal number.

Not every deposit counts. As one educational explainer on bank statement loans describes the process, underwriters strip out transfers and non-income credits before averaging. That step matters for casita rent, because a tenant’s payment is not business revenue.

Picture the whole thing as two separate questions. First, how much do you earn? Your statements answer that. Second, what does the property bring in? A lease and an appraisal answer that. Most confusion on this topic comes from blending the two.

Where Does Casita Rent Fit?

Casita rent fits in a different place depending on how you will use the home. Occupancy is the first fork, and it decides which rules apply. A casita on your primary residence is treated very differently from a casita on a rental you will never live in.

Notice what the table does not say. It does not say rent is automatically added to your income. Some programs allow a portion of documented rent to count. Others leave it out entirely and size the loan on deposits alone. Select lenders in the network differ on this, so the same casita can produce different answers from different programs.

A primary residence with a casita is a one-unit property with a second structure. A duplex or fourplex is a multi-unit property. Lenders handle them differently, and so do appraisers. Confirm which one you are buying before you compare programs.

The Three Ways Casita Rent Shows Up

Casita rent shows up on a bank statement file in one of three ways. It is added as qualifying income, used to offset the housing payment, or left out. Which one applies depends on the program, and you should ask early.

Added as income. A few programs let a documented portion of rent count toward qualifying income. The lender will want a signed lease, proof the tenant pays, and an appraiser’s rent figure. The counted share is usually less than the full rent. A haircut covers vacancy and upkeep.

Offset against the payment. Some programs do not add rent to income. Instead they let rent reduce the housing payment in the ratio. Your deposits still carry the file. The rent just eases the debt side.

Left out. Many files ignore casita rent altogether. Then you size the loan on deposits alone, and the rent becomes a cushion you enjoy after closing. For a first-time buyer, that is often the safest way to plan anyway.

Keeping Deposits Clean

A common trap is double-counting. Tenant rent can end up in the same account the lender averages. Then the lender faces a choice: strip it out or count it as your income. Either way you will need to explain it.

The cleanest fix is a separate account for rent. Open it before you apply if you can. Deposit rent there, and nowhere else, so the lender sees a tidy record of exactly what the casita earns.

If your rent already flows into a business or personal account, do not panic. Write a short letter of explanation. Say what the deposits are, who pays them, and how often. Underwriters reward clear explanations more than they punish messy accounts.

What Paper Proves a Casita Is Rentable

A casita needs four kinds of proof. The lender wants to know the rent is real, the tenant pays it, the unit is legal, and the number is reasonable for the market.

Appraisers report rent on a standard form. Form 1007 is the single-family rent schedule, and Form 1025 is the small income property report used for two to four units. Both show long-term market rent.

Cash and app payments need extra care. Move them to a bank deposit or a payment app with a clear history. A handwritten ledger will not carry a file. Consistent monthly deposits from the same tenant will.

Scarce comparables can also hurt. Where few casitas rent nearby, an appraiser’s rent figure may come in low. In some cases the casita gets folded into the main house value with no separate rent at all. Ask your lender how that outcome would affect the file.

New Casita Versus Existing Tenant

An existing tenant gives you history. A new or vacant casita gives you only a projection. Lenders treat those two situations very differently, and first-time buyers usually land in the second group.

With an existing tenant, you have a lease and months of receipts. The file looks like any rental with a track record. The rent may count in full or in part, depending on the program.

With no rental history, the rent is a projection. Many programs give projected rent little or no weight. Some will consider it if an appraiser supports the figure. Either way, you should not count on it to qualify.

A first-time buyer has one more wrinkle. You have no landlord record of your own. The tenant’s payment history belongs to the property, not to you. Be ready to show how you will manage the unit, such as a property manager or a clear lease template.

What This Means for a First-Time Buyer

A first-time buyer faces three practical pressures: the payment jump, the cash needed to close, and reserves. A casita can help with the third, but only if you do not spend the rent before you earn it.

On a primary residence purchase or rate-term refinance, select lenders in the network go up to 90% LTV. LTV is loan-to-value, the loan amount as a share of the home’s value. Stronger files earn the top of that range, and thinner files get less. An asset-depletion alternative, which is reviewed against liquid assets, runs to about 80% LTV on a primary residence. Loan sizes typically run from $125,000 to $3,500,000, and reserves commonly sit around six months of the housing payment.

Reserves are cash left in the bank after closing. Six months is a typical expectation, not a promise. If you rely on casita rent to cover the payment, a lender may still want those reserves in place.

Because you will live in the home, this is a consumer mortgage, and consumer disclosure rules (TRID) apply. A bank statement loan on a non-owner-occupied rental is different. It is business-purpose and exempt from TRID. Keep that line clear in your head, since the two files are not interchangeable.

Plan your statements ahead of time. Lendmire’s piece How to Prepare for a Bank Statement Loan as a First-Time Buyer walks through what to gather. The short version: keep business and personal money apart, explain unusual deposits, and avoid large transfers before you apply.

How Agency Rules Compare

Agency rules are a useful benchmark, not a template. Bank statement programs set their own treatment, and nothing below applies to them. The contrast just shows why rent gets discounted at all.

The federal housing agency’s Mortgagee Letter 2023-17 requires a standard appraisal plus a rent schedule for ADU income. It caps ADU rent at 30% of total effective income. It also bars ADU rent from qualifying a cash-out refinance. Fannie Mae’s ADU income job aid shows a 25% reduction for vacancy and loss.

The lesson is simple. Even in rule-heavy programs, casita rent never counts at 100%. Lenders discount it because tenants leave and units sit empty. Expect any bank statement lender to do the same in its own way.

A Worked Example (Ratios and Outcomes Only)

Run the numbers on one scenario with no dollar figures, since program terms differ by lender. Say you are a self-employed first-time buyer. You want to buy a primary residence with a legal casita. Your deposits support a comfortable payment on the main house.

Outcome one: rent not counted. The lender sizes the loan on your deposit average alone. The casita rent does not change the loan amount. After closing, the rent covers part of your housing cost and builds your reserves. This is the most common result.

Outcome two: rent counted in part. The program accepts a documented share of the lease. You hold a signed lease, six months of clean receipts, and a supportive appraisal. The counted rent nudges your ratios in the right direction. It does not replace your deposits.

Outcome three: rent-based loan. Suppose you instead buy the property as an investment. A rent-based loan looks at whether the property’s rent covers its own payment. Coverage is the test, and your bank statements matter much less. That is a different product with its own rules.

Which path fits you? If your deposits are strong, outcome one is fine. If your deposits are thin but the rent is strong and documented, outcome three deserves a look. This is a genuine judgment call, and a broker comparing several programs can usually tell you quickly which way it leans.

When a Rent-Based Loan Fits Better

A rent-based loan fits when the property’s income is the reason you are buying. That product is a DSCR loan. DSCR stands for debt service coverage ratio, which compares a property’s rent to its monthly obligation. It qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Lendmire’s complete DSCR loans guide covers the mechanics.

DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. You cannot use one to buy the home you plan to live in.

So the dividing line is occupancy. If you will live in the house and want your own income to carry it, a bank statement loan is the natural fit. If you will rent every unit and want the rent to carry it, a rent-based loan is the better fit. Mixing the two goals is where files stall.

Legality and Short-Term Use

A casita only counts if it is a legal, rentable unit. Lenders and appraisers look for permits, a kitchen, sleeping space, and a bathroom. A bedroom suite with no kitchen is hard to present as a rental. An unpermitted conversion may be excluded from the file entirely.

Short-term use needs a separate warning. An appraiser’s rent opinion reflects long-term rent, not nightly income. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income. Do not count on nightly rates to support a bank statement file.

Myths Versus Facts

Myth: bank statements mean the rent is automatically included. Fact: deposits prove your income, not the property’s rent. Rent needs its own documentation.

Myth: casita rent counts at 100%. Fact: lenders discount rent for vacancy and upkeep, and many programs leave it out.

Myth: a lease alone is enough. Fact: underwriters also want proof of receipt, an appraisal, and evidence the unit is legal.

Myth: agency ADU rules apply to bank statement loans. Fact: they do not. They are only a benchmark.

Myth: personal and business statements get the same treatment. Fact: business statements typically get an expense factor, and personal statements often do not.

Myth: a bank statement loan means no underwriting. Fact: every file is underwritten individually, and lenders still verify the income they rely on.

Key Terms Defined

Bank statement loan: a mortgage that is reviewed around average deposits from 12 months of statements instead of traditional personal-income documentation.

Expense factor: the share of business deposits a lender assumes went to costs, so only the remainder counts as income.

Casita: a small guest house or detached unit on the same lot as a main home, often called an ADU.

Form 1007: the appraiser’s rent schedule for a single-family home, showing long-term market rent.

Seasoning of rent: the track record of tenant payments that shows a unit really earns what the lease says.

Reserves: cash left in your accounts after closing, commonly around six months of the housing payment.

Next Step

If you are self-employed and want to see how the numbers work, Lendmire can help you compare bank statement loan options based on your deposits, the property, credit profile, leverage, and your goals. Lendmire is a mortgage broker that arranges these loans through select lenders in its wholesale network, with consumer lending available in 16 states. Reach the team at 828-256-2183 or request a quote. Programs review your file on documented income under the applicable program, subject to lender guidelines, and nothing here is a commitment to lend. Tax treatment varies; consult a qualified tax professional before relying on any deduction.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges bank statement, P&L-only, 1099-only and asset-based home financing in 16 states through wholesale lenders, on primary residences, second homes and investment properties. Every option is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Educational explainer on how bank statement loans turn deposits into income

2. HUD Mortgagee Letter 2023-17

3. Fannie Mae ADU income job aid