If you own a business, a lender doesn't just look at how much money came in. They do some math to figure out how much you can really count on, month to month. This page explains that math in plain, everyday words — no finance degree required.
Think of it like this: your tax return tells the taxman one number, so you pay less tax. But a lender wants to know something different — how much money you really have coming in, every single month, to make a house payment.
So the lender starts with the number on your tax return, and then makes a few fair adjustments — adding some money back in, and sometimes taking a little out — to get closer to the truth. Exactly how they do that depends on how your business is set up on paper.
There are three common ways a business can be set up. Almost everyone reading this fits into one of them:
Don't worry if those words are new to you — each one gets its own simple explanation below, with real numbers, so you can see exactly how the math works.
Not sure which type of business you have? Tap on the description below that sounds most like you, and it'll take you straight to your section.
This is the most common setup for a small business owner. Your business's money and your personal taxes are on the same tax form. See how the math works for you ↓
Your business files its own separate tax return, and then sends you a form (called a K-1) showing your share of what the business made. See how the math works for you ↓
Similar to an S-corp — the business files its own return and sends you a K-1 — but if you're a partner, you may have one extra advantage. See how the math works for you ↓
Good news for you — this is actually the simplest situation of all. See why ↓
Imagine you run a small bakery. At tax time, you write down every dollar customers paid you, then subtract everything you spent — flour, rent, your delivery van. What's left is called your "net profit," and that's the number on your tax return.
But here's the twist: some of what you "spent," on paper, wasn't really cash out of your pocket. For example, if your delivery van loses value every year (this is called "depreciation" on your taxes), that's a real tax deduction — but you didn't actually hand anyone a dollar for it. So the lender adds that money back in, because it's really still yours.
Here's the official list of what gets added back, and what gets taken away, from your tax return's bottom-line number:
Here's what that actually looks like with real numbers:
In plain words: that's about $10,417 every month — quite a bit more than the $105,000 number most people would assume is the final answer. This is just an example to show how the idea works. Your own tax return will have its own specific numbers, and not everything shown here will apply to you.
Think of your S-corp like a big shared jar of money. At the end of the year, the paperwork says "your share of the jar is $180,000." But that doesn't mean you actually took $180,000 out of the jar and put it in your own pocket — maybe you only pulled out $70,000 and left the rest in the business.
So before a lender will count your full "share of the jar" as income, they check one simple thing: does the jar still have enough money left in it to run the business normally, even after you'd take that money out? If yes, they can usually count your full share. If not, they can typically only count what you actually took out.
In official terms: your K-1 form shows your share of the business's income, but a lender needs one of two things to be true before using the full amount:
They compare what the business owns that can quickly turn into cash against what the business owes in the near term. If what it owns is equal to or bigger than what it owes, that's normally considered a good sign the business can afford the withdrawal.
In this example, only $70,000 was actually paid out to the owner — but because the business's "does it have enough money left over" score (1.36) clears the safe line (1.0), the lender can still count the full $180,000 share, plus the same kind of paper add-back described in the bakery example above. If that score had come in under 1.0, generally only the smaller, actually-paid-out amount could be used. This is just an example to show how the idea works, not an exact formula for every S-corp file.
Lenders call this the liquidity test, using one of two ratios depending on whether the business carries inventory: Current Ratio (current assets ÷ current liabilities) for most businesses, or Quick Ratio ((current assets − inventory) ÷ current liabilities) for inventory-heavy businesses. A result of 1.0 or greater is generally treated as sufficient evidence the business can absorb the withdrawal. The same add-backs and subtractions used on the sole-proprietor side above also apply here (depreciation, depletion, amortization, non-recurring casualty loss added back; non-deductible meals and short-term debt obligations subtracted), scaled to your ownership percentage.
Partnerships go through the same "jar of money" test described above for S-corps — but partners get one extra, easier option S-corp owners don't have.
Say your partnership pays you a fixed $8,000 every single month, no matter how the business is doing that particular month — almost like a regular paycheck. This is called a "guaranteed payment," and it works differently from a share of the profit.
Because it's steady and predictable — like a paycheck, not a bonus that changes — a lender can usually count it directly as your income, once you can show two years of getting it regularly. No "jar of money" test required for this part.
In official terms: a guaranteed payment is a fixed amount a partnership pays a partner regardless of whether the business turned a profit that year. With a documented two-year history, guaranteed payments can be added directly to qualifying income, skipping the liquidity/distribution test entirely.
Any additional K-1 ordinary income beyond the guaranteed payment still goes through the same distribution-or-liquidity check described in the S-corp section above — the guaranteed-payment shortcut applies only to the guaranteed-payment portion itself.
If you own less than a quarter (25%) of a business — say you're a small investor or minority partner in a company someone else runs — the lender treats you almost like a regular employee, not a business owner. That means much less digging into the business itself.
In official terms: if you receive a K-1 but own less than 25% of the business, a meaningfully lighter path applies. Fannie Mae's guide doesn't require the full self-employed business-viability analysis for these borrowers, and continuance of the income doesn't need to be separately verified unless the lender has a specific reason to doubt it.
This is a genuinely underexplained corner of self-employed underwriting — most guides jump straight from "self-employed" to "full business analysis" without mentioning that a real, lighter-documentation path exists for minority stakeholders.
Don't panic. Earning less one year than the year before does not automatically mean you'll be turned down. It just means the lender will ask a few more questions about why.
There's no secret number — like "if your income drops by 10%, you're automatically denied." That specific rule doesn't actually exist. If anyone tells you it does, they're wrong. What really happens is more human: your lender looks at your numbers over the past two years, and asks why the change happened. Was it a slow month that's already turned around? Did you lose one client but land a bigger one since? Those are very different stories than a business that's been sliding downhill for two straight years — and lenders know the difference.
This trips up a lot of people, so let's clear it up plainly. A 1099 is just a tax form. Getting one in the mail doesn't, by itself, decide anything.
"I got a 1099 form instead of a W-2, so I must be self-employed, and I need all the extra paperwork described on this page."
What actually decides it is how much of the business you own — 25% or more, and you're treated as self-employed; less than that, and an easier path applies. Getting a 1099 is just a clue that makes a lender ask the ownership question — it isn't the answer by itself. That said, most people who receive 1099s and work for themselves (freelancers, gig drivers, independent contractors with no partners) do own 100% of their own little "business," even if it's just them — so the ownership test usually does apply to them anyway. The real exception is someone who gets a 1099 from a company they only own a small piece of.
Type in your own numbers below. Check the boxes that sound like they apply to you, and the calculator will show you a rough, illustrative estimate — just to see how the idea works, not your real, official number.
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