Mortgage Calculator for Self-Employed Borrowers
The self-employed mortgage process runs on a fact that surprises every first-time 1099 borrower: lenders do not read your cash flow, they read your tax returns. Under Fannie Mae's guidelines, self-employed income is qualified on the net figure — after write-offs — averaged across two years. A business grossing $150,000 that writes off $50,000 is a $100,000 borrower in the underwriter's eyes, and a great year cannot erase a weak one from the average.
The calculator below is pre-set for a common self-employed purchase: $400,000 with 10% down at 6.75% — a $2,909.95 monthly payment with PMI and escrows. The sections underneath trace how the two-year net-income math works, when the rule bends, and the bank-statement route for borrowers whose returns deliberately understate their income.
Below 20% of price, PMI applies.
Often 1-2% of home value yearly.
Typically 0.3-1.5% of loan.
Optional — see the payoff effect.
Total monthly payment (PITI)
$2,909.95
Principal & interest $2,334.95 + PMI $150.00 + tax $300.00 + insurance $125.00.
- Loan amount
- $360,000.00
- Principal & interest
- $2,334.95
- PMI
- $150.00
- Total interest over the life of the loan
- $480,583.13
10% down — PMI applies below 20% equity and is usually removable once you reach it.
Private mortgage insurance, required below 20% down on conventional loans.
Estimates for conventional loans; taxes and insurance vary by location and coverage. Your lender's Loan Estimate is the binding figure — use this to sanity-check it.
Starting values are set for a typical self-employed scenario — change any field to match yours. Need the plain version? Mortgage Calculator.
Lenders read your returns, not your bank balance
Standard (QM) underwriting asks for two years of personal tax returns plus two years of business returns — Schedule C for sole proprietors, 1120S with K-1s for S-corp owners — and qualifies on the net income those documents show, averaged. The mechanics of the write-off paradox, worked through:
| Line | Amount | What the underwriter does with it |
|---|---|---|
| Year 1 net income | $95,000 | counted |
| Year 2 net income | $105,000 | counted |
| Two-year average | $100,000 | this is your qualifying income |
| Monthly housing budget at 28% | $2,333 | the principal-and-interest ceiling |
The two-year rule, and when it bends
Two full years of self-employment history is the standard, and the file is judged on its weakest year — a business that earned $130,000 then $90,000 qualifies closer to the second number than the first, because underwriters price direction and durability, not potential. The rule has recognized exceptions:
- Twelve months of self-employment can suffice where the borrower has a documented W-2 history in the same field — an engineer who left a salaried job to consult is not treated as starting from zero.
- A recently disbanded partnership or corporation counts as continuity: self-employment in the same line of work picks up where the entity left off.
- One bad year inside an otherwise strong two-year file can be documented away — a documented medical leave or a one-off loss event gets an explanation letter, and some lenders re-average excluding it.
- Rising income is not credited prospectively: a business up 40% this year still qualifies on the two-year average, which is why loan timing matters — apply after the strong year lands on the return, not before.
Bank statement loans: the write-off workaround
For borrowers whose returns are deliberately lean — the owner who maximizes deductions and shows a small net — the non-QM market offers bank statement loans: qualification on 12 or 24 months of deposits instead of tax returns, with the lender applying an assumed expense factor (commonly 25-50% of deposits) to estimate income.
- The trade is price: expect rates and fees meaningfully above conventional — the flexibility is underwritten as risk, not given away.
- Documentation is the bank statements plus a license or CPA letter confirming the business operates; no tax returns are requested.
- They fit a specific borrower: strong, regular deposits, returns that understate income by 30% or more, and a plan to refinance to conventional once two years of cleaner returns exist.
- For everyone else, the cheapest loan is usually the conventional one — a year of lighter write-offs before applying costs less than years of non-QM pricing after it.
Frequently asked questions
- How do lenders verify self-employed income?
- Two years of personal tax returns (1040 with all schedules) plus two years of business returns — Schedule C, or 1120S with K-1s — a year-to-date profit and loss statement, and proof the business is still operating (license or CPA letter). Qualifying income is the net figure from those documents, averaged across the two years.
- Why do my write-offs hurt my mortgage application?
- Because lenders qualify you on net income, not gross — the deductions that lower your tax bill lower your qualifying income dollar for dollar. A business grossing $150,000 with $50,000 of write-offs is a $100,000 borrower. The write-off paradox is the central trade of self-employment: every deduction trades tax savings today for borrowing capacity later.
- Can I get a mortgage with only one year of self-employment?
- Possibly. The standard is two years, but lenders routinely make an exception where the borrower has a W-2 history in the same field — an employee-turned-consultant inherits the continuity of the career, not the start date of the business. A brand-new business in a new field generally waits out the two years.
- What is a bank statement loan?
- A non-QM product that qualifies you on 12 or 24 months of bank deposits instead of tax returns, applying an assumed expense factor to the deposits. It exists for borrowers whose returns understate their real income — at the cost of higher rates and fees than conventional. Best treated as a bridge until two years of conventional-friendly returns exist.
- How much income do I need for this loan?
- The preset's $2,909.95 monthly payment needs about $125,000 of qualifying income at the 28% guideline with no other debts. The principal-and-interest alone — $2,334.95 — fits the budget of a $100,000 qualifying income, which is the point: PMI and escrow costs are what push the self-employed borrower's required income up, and they are exactly the costs the two-year net figure has to cover.
- Should I skip write-offs the year before applying?
- It is a real trade, and often the right one. Every $10,000 of skipped deductions costs roughly $2,200-3,700 in tax (at 22-37%) while raising qualifying income by the full $10,000 — which can be worth far more in rate and loan size over a 30-year mortgage. Run both scenarios with an accountant before the tax year closes, because after the return is filed, it is the document.