Grossing Up Non-Taxable Income to Qualify for a Mortgage

Grossing up non-taxable income for a mortgage means the lender increases the dollar value of your tax-free payments, usually by 25%, so that income reflects the same spending power as taxable wages when they measure what you can afford. The adjustment matters because lenders compare your gross monthly income to your debts. Without the gross-up, a borrower living on tax-free disability or Social Security would look like they earn far less than a wage earner who takes home the same amount after taxes. Closing that gap can be the difference between an approval and a denial.

Which Income Qualifies

The income has to be verifiably non-taxable under federal law, and you need paperwork to prove it. The common qualifying sources:

Alimony is the source that confuses borrowers. Agreements executed after December 31, 2018 make alimony non-taxable to the recipient, so it can be grossed up. Older agreements follow the previous rule, where alimony is taxable income for the recipient, and there is nothing to gross up.4Internal Revenue Service. Divorce or Separation May Have an Effect on Taxes Taxable military pay such as flight pay, hazard pay, overseas pay, and combat pay also falls outside the gross-up, though it can still count as qualifying income if it will continue for at least 12 months.3Veterans Benefits Administration. Grossing Up

How the 25% Adjustment Works

Fannie Mae’s Selling Guide sets the benchmark most of the industry follows: lenders may develop an adjusted gross income by adding 25% to verified non-taxable income.5Fannie Mae. Fannie Mae Selling Guide – B3-3.1-01, General Income Information Multiply your tax-free monthly income by 1.25. If you receive $2,000 a month in tax-free disability, the lender credits you with $2,500 in qualifying income. That extra $500 lowers your debt-to-income ratio and can push you over the approval line.

The 25% is not a cap. Fannie Mae explicitly allows a higher percentage if the federal and state taxes a comparable wage earner would pay actually exceed 25% of the borrower’s non-taxable income.5Fannie Mae. Fannie Mae Selling Guide – B3-3.1-01, General Income Information A borrower whose household falls into a higher combined bracket, often because a spouse earns a taxable salary, can ask the lender to use the actual rate. Most lenders default to 25% because the documentation is lighter, so you may need to raise the issue yourself.

How Each Loan Program Treats It

Conventional Loans

Fannie Mae’s 25% standard, with the option for a higher actual tax rate, applies across all non-taxable income types once the lender verifies the tax-exempt status with award letters, tax returns, or account statements.5Fannie Mae. Fannie Mae Selling Guide – B3-3.1-01, General Income Information Freddie Mac’s Seller/Servicer Guide Section 5305.1 permits lenders to gross up tax-exempt income or the tax-exempt share of partially taxable income.6Freddie Mac. Guide Section 5305.1 For loans run through Fannie Mae’s Desktop Underwriter, the maximum debt-to-income ratio is 50%.7Fannie Mae. Debt-to-Income Ratios

FHA Loans

FHA guidelines in HUD Handbook 4000.1 permit grossing up non-taxable income, and the FHA generally uses the same 25% standard. The FHA benchmark DTI is 43%, though automated underwriting can approve higher ratios with compensating factors.

VA Loans

The VA is the outlier. Instead of a flat 25%, VA guidelines direct lenders to use federal tax tables to determine the gross-up percentage based on the borrower’s income level. For most veterans receiving only non-taxable income, this works out to roughly 15%.3Veterans Benefits Administration. Grossing Up That is noticeably less generous than the conventional standard and catches some VA borrowers off guard. The VA DTI benchmark is 41%, used as a guideline rather than a hard cutoff.

Partially Taxable Social Security

Social Security benefits can be fully non-taxable, partially taxable, or mostly taxable depending on total income.8Internal Revenue Service. Social Security Income Fannie Mae offers a shortcut: lenders may assume at least 15% of a borrower’s Social Security income is non-taxable without additional documentation. Only that 15% slice gets the 25% gross-up.

For a $1,500 monthly benefit, the math looks like this:

  • Non-taxable portion: $1,500 × 15% = $225
  • Gross-up amount: $225 × 25% = $56
  • Qualifying income: $1,500 + $56 = $1,556

The $56 bump is modest, but it compounds against the DTI calculation and can be larger if you can document that more of the benefit is actually non-taxable. Showing your tax returns reporting less than 85% of the benefit as taxable lets the lender gross up a bigger slice.9Fannie Mae. Social Security Income

What the Lender Will Ask For

Lenders will not take your word that income is non-taxable. Expect to produce some combination of these:

  • Award letters: Social Security Administration letters for retirement or disability, VA benefit letters for disability compensation, or insurer letters for private long-term disability.
  • Two years of federal tax returns confirming how the income was reported.
  • For child support, the court order setting the obligation plus evidence of consistent receipt.
  • For active-duty military, the Leave and Earnings Statement, which breaks out BAH and BAS as separate entitlements.10Defense Finance and Accounting Service. Army: Reading Your LES
  • IRS Publication 525, which some lenders reference to confirm an income type is classified as non-taxable under federal law.2Internal Revenue Service. Publication 525, Taxable and Nontaxable Income

For income like child support, where the amount depends on another person making the payments, lenders want a track record. The old FHA standard called for at least 12 months of documented payment history, with shorter periods acceptable only when the lender could independently verify the payer’s ability and willingness to continue.11U.S. Department of Housing and Urban Development. HUD 4155.1 Mortgage Credit Analysis for Mortgage Insurance – Section: Alimony, Child Support, and Maintenance Income

The Three-Year Continuity Rule

Verifying that income is non-taxable is only half of what the lender needs. The income also has to last. Fannie Mae requires documentation that income with a defined end date, or that depends on depleting an asset, will continue for at least three years from the note date, not the application date.5Fannie Mae. Fannie Mae Selling Guide – B3-3.1-01, General Income Information Freddie Mac applies the same three-year standard.

Child support is where this rule bites hardest. If your child turns 18 in two years and support ends then, the income fails the three-year test and cannot be grossed up or counted at all. The same logic sinks a disability policy with a benefit period expiring inside three years, or a structured settlement that runs out too soon. Income without a defined expiration, like Social Security retirement or permanent VA disability compensation, satisfies the continuity requirement without extra documentation.

What It Does to Your DTI

The grossed-up figure gets folded into your total monthly qualifying income with any taxable wages or self-employment earnings. The lender divides your total monthly debt, including the proposed mortgage, by that income figure to produce your DTI ratio.

A borrower with $1,800 per month in tax-free SSDI and $2,200 in wages has $4,000 in qualifying income without any adjustment. Grossing up the SSDI at 25% turns it into $2,250, raising total income to $4,450. That $450 difference lowers the DTI by several percentage points and can add tens of thousands to the maximum loan amount.

The impact is larger when all of your income is non-taxable. A retired veteran receiving $3,000 a month in VA disability compensation qualifies on $3,000 flat, on $3,750 using the conventional 25% adjustment, or on about $3,450 using the VA’s tax-table method at roughly 15%. If you have a choice of loan programs, the gap between those three figures is worth running before you pick one.