Tax Return Averaging vs Bank Statements on Purchase or Refinance

The Quick Read: Tax return averaging suits self-employed borrowers whose filed returns still show strong net income after deductions, while bank statements suit borrowers whose deposits show more cash flow than their returns do. Neither method is tied to purchase or refinance; the program decides, not the transaction type. Select lenders in Lendmire’s wholesale network qualify bank statement files on documented income under the applicable program, subject to lender guidelines.

• Tax return averaging and other traditional personal-income documentation count net income after write-offs. Bank statements count deposits after an expense factor.
• Bank statement files use 12 months of statements, business or personal.
• Primary residence purchase and rate-term can reach 90% LTV. Owner-occupied cash-out tops out at 80% LTV.
• Investment-property cash-out tops out around 75% LTV.
• A DSCR loan uses neither method. It looks at the rental property’s income. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Here is the honest answer on who each option is for. Tax averaging fits the borrower whose business is steady or growing and whose returns don’t hide much income behind deductions. Bank statements fit the borrower whose write-offs pull taxable income well below what actually flows through the accounts. Both methods qualify the person. A third option, a DSCR loan, qualifies the property. This article referees the first two and shows where the third sits. The complete DSCR loans guide covers that third path in full.

Side-by-Side

The bank statement column reflects what select lenders in the network use. The tax-return column describes published industry norms, which vary by program.

How Tax Return Averaging Works

The lender starts with the net figure on the return. For a sole proprietor, that is Schedule C net profit. It is a starting point, not the answer.

Then come adjustments. Lenders typically add back non-cash items such as depreciation, depletion and amortization, as StatementsReady’s self-employed walkthrough lays out. The lender then averages the two years. If income fell, the lower year often replaces the average. Exact thresholds differ by program, so treat any single percentage you read online with caution.

The structural catch is simple. Every deduction that saved you tax also lowered the income a lender can use. That is not a flaw in the method. It is how the method works.

How Bank Statement Qualification Works

The lender reviews 12 months of statements and sorts deposits into income and non-income. Transfers, one-time deposits and unsourced cash deposits typically get stripped out.

On business statements, an expense factor then applies. Kubera’s explainer describes it as the share of deposits assumed to go to operating costs. Across the network, owner-occupied cash-out files use a fixed expense ratio, with an accountant-prepared ratio available on those files in place of the fixed one. Personal statements count eligible deposits at or near full value.

The formula in plain terms: eligible deposits, divided by months, reduced by the expense factor. That gives monthly qualifying income.

Run the logic on a modeled business. Say its tax return shows thin net income after heavy equipment depreciation and a home office, while its deposits run steady month after month. Tax averaging would land low. The bank statement method could land meaningfully higher, even after the expense factor. Flip the picture, a business with big deposits and big real costs, and the expense factor could erase the advantage. That is the whole comparison in one example.

Bank statement programs are underwritten, not casual. Every month is read line by line. Lenders commonly ask for business verification and letters of explanation for large or unusual deposits.

When Tax Return Averaging Is the Better Fit

Tax averaging wins in these situations:

• Clean, consistent returns. If net income after add-backs already supports the loan, there is no reason to take on the deposit scrutiny of statements.
• Mostly W-2 or simple income. Few deductions means little income hidden.
• Messy or commingled accounts. If business and personal money flows through the same account, statements get hard to read. Returns can be cleaner.
• Rising income with explainable growth. A rising trend gets averaged, though the lender will want the increase explained.
• Borrowers who can wait. Some borrowers have returns that will look stronger once the next filing lands. A slightly delayed purchase can beat a more expensive alt-doc structure.

The downside is the one named above: heavy deductions shrink the number. Rental losses and write-offs can compound that for investors. For K-1 filers, ownership percentage drives the math; Lendmire’s piece K-1 Income vs Bank Statements When Business Expenses Shrink the Tax Return goes deeper.

When Bank Statements Are the Better Fit

Bank statements win in these situations:

• Write-off heavy businesses. If deductions cut taxable income sharply but deposits stay strong, statements show the real cash flow.
• Recent revenue is the strongest. A 12-month window can capture a growth year that a two-year average would dilute.
• Self-employed with orderly accounts. Dedicated business accounts, regular deposits, few overdrafts.
• Owner-occupied purchase or rate-term refinance with high leverage needs. Primary residence files can reach up to 90% LTV through select lenders, with stronger files earning the top of the range.
• Asset-rich borrowers. An asset-depletion alternative qualifies from liquid assets, up to about 80% LTV on a primary residence.

The tradeoff: lenders sort every deposit, and the expense factor can cut qualifying income hard. Loan sizes run roughly $125,000 to $3,500,000, with reserves commonly around six months of the housing payment.

Purchase vs. Refinance: What Actually Changes

Less than most borrowers expect. No cited rule treats the income methods differently between purchase and refinance. The method depends on the program.

What changes is the leverage ceiling and the file’s mechanics:

A cash-out file never inherits the purchase ceiling. Files that pencil at 90% on a purchase get cut back when someone tries to pull equity from the same house.

The disclosure regime also depends on occupancy. An owner-occupied file is a consumer mortgage, and TRID applies. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from TRID. Say which one applies before the file goes in, and never mix them.

Where DSCR Fits

A DSCR loan skips the personal-income calculation entirely. That matters for portfolio investors, because a personal-income ceiling stops mattering as the portfolio grows. Credit is still checked, and the property still gets reviewed.

Business-purpose investor loans are reviewed differently from standard owner-occupied mortgages. The CFPB’s Regulation Z § 1026.3 exempts credit extended primarily for business purposes, and that purpose, not the label “investment property,” drives the treatment. Owner-occupied rentals follow different unit-count rules. Business purpose also does not mean free of every compliance question.

The practical rule: buying a house to live in points toward traditional personal-income documentation or bank statements. Buying a rental points toward DSCR, where rent is the qualifying figure. A bank statement cash-out against a rental is possible, though leverage tops out around 75% LTV. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

Preparing the File

Most delays on alt-doc files are documentation gaps, not credit problems. Fix these before submission:

1. Separate the accounts. Keep business deposits in business accounts. Lenders want to see how money moves between personal and business accounts, and commingling forces explanation letters.

2. Source the large deposits. Every unusual deposit gets a letter of explanation. Unsourced cash deposits are typically excluded.

3. Get the P&L ready. A CPA-prepared P&L can sometimes support a lower expense factor.

4. Match the entity documents. Business verification should match the name on the statements.

5. Document reserves. Roughly six months is common. Asset statements should be current.

For tax-return files, line up two years of complete returns with all schedules, plus a year-to-date P&L. Declining income needs a written explanation up front.

Key Terms Defined

Tax return averaging: Averaging net income from two years of filed returns after lender add-backs.

Add-backs: Non-cash expenses, such as depreciation, that a lender adds back to net income.

Expense factor: The share of business deposits a lender assumes goes to operating costs.

Non-QM: A mortgage outside the qualified mortgage box. It still requires documented ability to repay, per Scotsman Guide’s non-QM overview.

Asset depletion: Qualifying from liquid assets instead of income.

The Balanced Verdict

Pick tax averaging when the returns tell the true story. Pick bank statements when deductions hide income that the deposits plainly show. Pick DSCR when the property is a rental and the rent carries the payment. Many self-employed investors use all three at different points in a career. Tax treatment varies by how funds are used and how the property is held, so consult a qualified professional.

Reach the team at 828-256-2183 or through the quote page. Consumer mortgage licensing for these files covers 16 states, and every file is underwritten individually.

About Lendmire

Lendmire (NMLS# 2371349) is a DSCR-focused mortgage broker that helps arrange investor financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. DSCR eligibility is generally reviewed by the lender around the property’s rental income rather than personal income documentation, subject to lender guidelines, which works for self-employed investors, LLC operators, and portfolios above four financed properties. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. StatementsReady: Self-employed income documentation

2. Kubera: Bank statement loan explainer

3. CFPB Regulation Z § 1026.3

4. Scotsman Guide: Non-QM loans overview