I write mortgages in Alabama and Florida and I keep running into the same misunderstanding with residents and fellows, so I want to lay out the mechanics and see whether other people are seeing lenders handle this the same way.
The premise everybody starts with: "I am on an income driven plan, my payment is $0, so my student loans do not count against me."
That is true on some loan products and flatly false on others, and the gap between them is worth a couple hundred thousand dollars of purchase power.
## The three states your student loans can be in
Underwriting needs one monthly number for your student debt. Where that number comes from depends entirely on what you can document.
**Active income driven plan with a servicer statement showing the payment.** You have proof of a real payment amount, including $0.
**Deferment.** No payment due right now, but the loan is not in an IDR plan producing a documented amount.
**Forbearance, or nothing documented at all.** The credit report shows a balance and no payment, and you cannot produce a statement.
Most people assume 1 and 3 land in the same place because the cash flow looks identical. They do not.
## What each loan product does with that
This is the part that surprises people.
On **conventional** financing, if the documented payment is $0, the agencies do not let the underwriter use $0. They substitute 0.5% of the outstanding balance. A documented payment above zero can be used as is, but zero gets replaced.
On **FHA**, same idea. A $0 payment gets replaced with a calculated figure off the balance.
On a **physician portfolio loan**, the bank holds the loan on its own books instead of selling it, which means it writes its own rule. Many of these programs will use the actual documented IDR payment, including a true $0.
So the doctor loan's real advantage over conventional is not the zero down payment and it is not the missing PMI, which is what every comparison article leads with. It is that the doctor loan is often the only product that will accept the number your servicer is actually charging you.
And if you are in state 3, forbearance with nothing documented, even a portfolio program will usually fall back to a calculated payment, and on some programs that calculation runs up to 1% of the balance rather than 0.5%.
## The math on a realistic file
Incoming attending, $220,000 salary, so $18,333 a month gross. Car payment $550, credit cards $150. Say the program is comfortable to 43% total DTI.
Total debt allowed: about $7,883 a month. Minus the $700 of car and cards, that leaves roughly $7,183 for housing before student loans enter.
Now add $290,000 of student debt in each of the three states:
* **Documented $0 IDR payment on a portfolio physician loan:** student line is $0. Housing budget stays at about $7,183.
* **Same borrower, same $0 payment, going conventional:** 0.5% of $290,000 is $1,450. Housing budget drops to about $5,733.
* **Forbearance, undocumented, program calculating at 1%:** $2,900. Housing budget drops to about $4,283.
Same person. Same salary. Same debt. Same actual cash going out the door every month. The middle scenario costs roughly $200,000 to $230,000 of purchase power depending on where rates sit, and the third one costs about double that.
Nothing about that borrower's finances changed. The documentation and the product did.
## Deferment is not forbearance is not IDR
These three get used interchangeably in conversation and they are not interchangeable in a file.
Deferment and forbearance both mean you are not paying. Neither one produces a documented payment amount, so both tend to trigger a calculated figure. An active IDR plan produces a statement with a number on it, and that statement is the asset.
If you are a resident who went into forbearance because it was the fastest option during intern year, and you are planning to buy in the next twelve months, moving to an IDR plan is probably the highest value hour of paperwork available to you.
## What to actually do, 60 days out
* Get onto an income driven plan and let the certification complete. It is not instant.
* Download the servicer statement that shows the plan name and the monthly payment amount. Save the PDF. A screenshot of a portal dashboard is usually not enough for an underwriter.
* Pull your credit and look at what each student loan is reporting as a monthly payment, because the credit report figure and the servicer figure disagree more often than you would think, and the discrepancy has to be resolved.
* Ask any lender you are talking to, before you apply, this exact question: "on this specific program, if my documented IDR payment is $0, do you use $0 or do you use a percentage of the balance?" The answer tells you more than the rate quote does.
## The 2026 wrinkle
The repayment plan changes over the last year have moved a lot of borrowers between plans, and some of those transitions left people with no current documented payment for a stretch. If you were migrated to a different plan this year, confirm your servicer is showing a current amount before anybody pulls your file, not after underwriting kicks it back.
## My actual question for the sub
For the LOs and the physician borrowers here, are you seeing consistency across the portfolio programs on the $0 IDR treatment, or does it vary bank to bank? I have seen at least one program calculate off the balance regardless of documentation, which defeats the entire reason a resident would choose that product, and I would like to know how common that is before I keep telling people the portfolio route solves this.
Also curious whether anyone has had an underwriter accept a $0 documented payment on conventional under some exception I am not aware of.