The reason to have a co-signer on a mortgage is because that person can help you qualify for the loan. For example, if a person earns significant income or has sizeable financial reserves then having them co-sign your loan may help you get approved or qualify for a higher mortgage amount. If the person lacks these characteristics, then it may not make sense to have them co-sign your loan.
In some scenarios, like the one you describe in your question, having a co-signer offers little benefit to your application. For example, if the co-signer does not earn a monthly income but has debt expenses such as a mortgage, credit card or other loan payments, no additional income is added to your application but the co-signer’s debt payments are included in your debt-to-income ratio.
The higher your monthly debt expense, the lower the mortgage you can afford. So in your case, if your Dad co-signs your mortgage, the lender uses a higher monthly debt expense with no additional income, which decreases the loan you qualify for.
Use ourMORTGAGE QUALIFICATION CALCULATORto determine the loan you can afford based on your monthly income and debt
Another point to consider is that even if the co-signer has a higher credit score, this may not boost your application as much as you think. This is because when two people apply for a mortgage, the lender typically uses the lower credit score between the two applicants.
So if your credit score is 640 and your co-signer’s score is 740, the lender uses your score to determine your ability to qualify for the mortgage and to set your loan terms. With most programs, the lower your credit score, the higher the mortgage rate you pay and vice versa.
Returning to your specific situation, even though your Dad has a high credit score, the lender likely only uses your (lower) score to evaluate your application. In short, including your Dad as a co-signer has minimal impact on your ability to qualify for a mortgage and may even be detrimental because your Dad does not contribute any income.
For the reasons outlined above, you should consider applying for the mortgage as a sole borrower and focus on financing options such as the FHA and HomeReady mortgage programs that offer more flexible qualification guidelines for credit-challenged borrowers.
For example, you can qualify for an FHA mortgage with a credit score as low as 500 if you make a 10% down payment and a score of 580 if your down payment is between 3.5% and 10% of the property purchase price.
Another positive of the FHA program is that FHA mortgage rates tend to be lower than conventional rates, which reduces your monthly payment and increases the loan you qualify for.
The table below shows FHA loan terms for leading lenders in your area. We recommend that you contact multiple lenders to determine the mortgage you qualify for and to find the best terms including the lowest rate and closing costs.
The downsides of the FHA program are that you are required to pay an upfront and ongoing mortgage insurance premium (MIP) which increases your closing costs and monthly payment. Unlike a conventional mortgage, FHA MIP is non-cancellable in most cases, which means you are required to pay it for the entirety of your loan.
Review our FHA Mortgage Guide
If you prefer a conventional mortgage option, then you should consider the HomeReady program which requires a credit score of 620 and may permit applicants with limited or no credit history in some cases. Additionally, the HomeReady program requires a down payment of only 3% to qualify.
Although the HomeReady program does not require you to pay an upfront mortgage insurance fee, you are required to pay monthly private mortgage insurance (PMI) until your loan-to-value (LTV) ratio reaches a certain level -- typically 78% to 80%. HomeReady also applies borrower income limits, which means you may not be eligible for the program if you earn too much money.
Review our HomeReady Mortgage Guide
In closing, although having your Dad co-sign your mortgage may not be the best idea, there are multiple loan programs that may help you qualify. We recommend that you review your options to find the program that best meets your needs.
"B2-2-04, Guarantors, Co-Signers, or Non-Occupant Borrowers on the Subject Transaction." Selling Guide: Fannie Mae Single Family. Fannie Mae, June 5 2018. Web.