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A pre-approval is not a verdict; it is a snapshot of your income, debts and credit on the day the lender pulled them. Change the inputs and the number changes. This guide covers how to increase how much you can borrow, with each move priced on the same file so you can see which ones matter. Run your own numbers in the how much can I borrow calculator as you go. The base case: $8,000 gross monthly income, a 36% back-end cap, $750 a month of taxes and insurance, a $700 car payment and $300 of card minimums, 6.5% over 30 years. That file supports a loan of about $178,800.
Move 1: pay down the cards
Card minimums are the cheapest debt to remove, because the minimum is a small share of the balance. Paying off the $300 of minimums, which might mean clearing $8,000 to $10,000 of balances, lifts the loan to $226,200. That is $47,000 of mortgage for $9,000 of cash, the best ratio of anything on this list.
Do not close the accounts afterwards. Closing old cards shortens your credit history and raises your utilization on the cards that remain, which lowers the score. Pay them down, leave them open, and let the lender see zero balances on the report.
Move 2: clear the car loan, or wait it out
The $700 car payment is the biggest single drag. Paying it off as well takes the loan to $337,000. Few buyers have the cash to do that, so look at the alternative: if fewer than ten payments remain, most lenders exclude the debt from DTI without you paying anything. Check the payoff schedule. If you are twelve months from the end, waiting two months may be worth more than any other move here.
Trading in the car for a cheaper one does not help; the new loan’s payment replaces the old. Only payoff or exclusion works.
Move 3: add a co-borrower
A spouse, partner or parent on the loan adds their gross income in full and their debts in full. Adding a co-borrower with $3,000 of income and no debts raises the loan to $349,600. The co-borrower is fully liable for the mortgage and it appears on their credit report, which is why parents who co-sign often find their own borrowing power reduced for years. A co-borrower with a low credit score can also hurt: conventional pricing uses the lower of the two scores.
Move 4: shop the rate
Every eighth of a point changes the loan a given payment supports. At 6.0% instead of 6.5%, the base file supports $188,500 instead of $178,800, a $9,700 gain for the price of three more quotes. Buying the rate down with points costs cash at closing, so it only pays if you keep the loan long enough; a quarter-point buydown to 6.25% adds about $4,700 of borrowing power here. An adjustable-rate mortgage at 5.5% for the first seven years supports $199,000, but the rate can rise afterwards, and the lender qualifies you at a higher rate than the teaser, so the gain is smaller than it looks.
Move 5: ask for the higher cap
The 36% guideline is conservative. Conventional underwriting through Fannie Mae’s automated system routinely approves back-end ratios of 45%, and up to 50% for files with high credit scores, reserves and a sizeable down payment. At 45% the base file supports $292,700, a 64% jump with no change to your finances. FHA goes to 43% as standard and higher with compensating factors. Ask the loan officer what the automated underwriting system returned, since the lender’s own overlay may be stricter than the program allows. The higher cap raises risk for you as well, so compare the payment with your take-home pay before you use it.
Move 6: raise the down payment
A bigger down payment does not change the DTI math, but it changes two things around it. It removes PMI once you reach 20%, which on a $300,000 loan is $125 to $375 a month back in the payment budget, and every dollar of that supports about $158 of loan. And it moves you into a better pricing tier on the conventional grid, which lowers the rate. Gift funds from family are allowed on most programs with a gift letter and a paper trail for the transfer.
Move 7: lengthen the term
A 30-year term supports more loan than a 15-year one at the same payment, which is why nearly all first-time buyers take it. Beyond 30 years, options are limited: 40-year mortgages exist mostly as loan modifications and are not offered by most lenders for purchases. If you are considering a 15-year loan for the lower rate, note the cost in borrowing power: the base file supports $178,800 over 30 years and only $130,000 over 15.
What each move is worth
| Move | Loan supported | Gain over base |
|---|---|---|
| Base case | $178,800 | |
| Pay off $300 of card minimums | $226,200 | +$47,400 |
| Pay off the $700 car loan as well | $337,000 | +$158,200 |
| Co-borrower with $3,000 income | $349,600 | +$170,800 |
| Rate 6.0% instead of 6.5% | $188,500 | +$9,700 |
| Cap 45% instead of 36% | $292,700 | +$113,900 |
| 7/1 ARM at 5.5% (qualified at the start rate) | $199,000 | +$20,200 |
The three big levers are debts, a co-borrower and the cap. Rate shopping is worth doing but it moves the number far less than people expect, and it moves the cost of the loan far more, which is the better reason to do it.
What does not help
Income that is not documented. Cash tips, side work without tax returns and a raise that starts next month do not count. A new job in the same field is fine; a new job in a new field usually needs a few months of pay stubs.
A larger emergency fund, by itself. Reserves help the approval and the pricing but do not enter the DTI formula.
Applying at many lenders over months. Multiple mortgage inquiries within a 14- to 45-day window count as one for scoring purposes; spread over months, they do not, and the score drops.
Putting it together
Pull your own credit reports first and fix errors, because a paid-off loan still listed as open is the most common free gain. Then pay down cards, check whether the car loan is near exclusion, and ask the lender for the automated finding on the cap. Add a co-borrower only if they understand the liability. Shop at least three lenders in the same two weeks. Keep the paperwork for every move: payoff letters for the cards, the lease for rental income, the gift letter for the down payment, because the underwriter will ask for each one and a missing document delays the file more than a weak number does.
Then go back to the how much can I borrow calculator with the new debts, rate and cap and see where you land. The loan payment calculator will show the payment on the loan you choose, and if the plan involves paying down a loan, the extra payment calculator sizes it. All the tools are on the homepage.
FAQs
How long before applying should I pay down my cards?
At least one full statement cycle before the credit pull, so the lower balance is reported to the bureaus. Paying the day before the application does not help; the report still shows the old balance. Some lenders can do a rapid rescore in a few days for a fee if timing is tight.
Will a co-signer who does not live in the home count?
On conventional loans a non-occupant co-borrower is allowed and their income counts, usually with a slightly lower maximum loan-to-value. FHA allows a non-occupant co-borrower who is a relative. VA loans generally require co-borrowers to be a spouse or another eligible veteran.
Does a higher credit score increase how much I can borrow?
Indirectly. A higher score gets a lower rate, and a lower rate supports a larger loan for the same payment: about $9,700 more on the example file for half a point. It also makes the lender more willing to approve a higher DTI cap, which is the bigger effect.
Can I count rental income from a room or a basement unit?
Only with a lease and, for most programs, a history of receiving it. Income from a unit in the home you are buying can count on 2- to 4-unit properties at 75% of market rent from the appraisal. Short-term rental income usually needs two years of tax returns.
Is it better to pay down debt or save a bigger down payment?
If the debt has a monthly payment, paying it down usually adds more borrowing power per dollar: $9,000 of card balances removed added $47,000 of loan in the example, while $9,000 more down payment adds $9,000 of house and perhaps a slightly better rate. Once the debts are gone, the down payment wins.
Does a student loan in deferment count against me?
Yes. If no payment is reported, conventional lenders use 1% of the balance (0.5% for Fannie Mae on some files) as the monthly payment, and FHA uses 0.5%. On a $60,000 balance that is $300 to $600 a month of DTI. An income-driven repayment plan with a documented low payment can replace that figure.
