The Direct Answer: To ensure your mortgage approval stays on track, you must avoid major financial shifts during the home-buying process. The most critical “don’ts” include making large purchases (like cars or furniture), changing or quitting your job, applying for new credit, and missing any loan payments. These actions can negatively impact your Debt-to-Income (DTI) ratio or credit score, leading a lender to revoke your financing even after a pre-approval.
The “Not To Do” List for Home Buyers
1. Don’t Overestimate Your Budget
Before house hunting, secure a pre-approval to know your true limit. Lenders typically look for a Debt-to-Income (DTI) ratio below 33%. Calculating your own spending habits via apps like Mint or Itab helps you find a comfortable monthly payment that fits your lifestyle.
2. Don’t Get Emotionally Invested
The market can be volatile; home inspections can fail, or better offers may emerge. Approach the process with high intention but low attachment to avoid burnout or overpaying for a “perfect” home.
3. Don’t Make Large Purchases
Avoid financing new cars or expensive furniture sets before closing. Lenders base your pre-approval on the debt levels present when you applied; a new loan could drastically reduce the amount they are willing to lend.
4. Don’t Flag Your Account with Large Cash Deposits
Banks monitor the last 60 days of statements. Large, untraceable cash deposits are red flags as they may be disguised loans. If you receive a gift for your down payment, ensure you have a signed gift letter stating it is not a loan.
5. Don’t Open New Credit Lines
Applying for a new credit card or store financing increases your total debt and can lower your credit score. This can disqualify you from the mortgage rate you were originally quoted.
6. Don’t Co-Sign for Anyone Else
Co-signing a loan makes you legally responsible for that debt. This additional liability is added to your DTI ratio and can severely limit your own purchasing power.
7. Don’t Leave or Switch Your Job
Stability is the top priority for lenders. Quitting, switching careers, or starting a new business right before closing suggests financial instability and may cause a lender to deny your loan.
8. Don’t Miss Any Monthly Payments
Even a single 30-day late payment can drop your credit score by 100+ points. Be extra diligent with your bills, especially during the 60 days leading up to your home purchase.
9. Don’t Switch Banks
Lenders require at least 60 days of consistent bank history. Switching banks last minute complicates the documentation process and may delay your closing.
| Action | Impact on Mortgage | Recommendation |
| Buy New Car | Increases DTI; Reduces Loan Amount | Wait until after closing |
| Get Pre-Approved | Confirms Buying Power | Do this first |
| Change Jobs | Signals High Risk to Lender | Stay in current role |
| Miss Payment | Severe Credit Score Drop | Set up autopay |
FAQ: Frequently Asked Questions
Can I deposit a gift from a parent for my down payment? Yes, but the bank will require a gift letter to prove it isn’t a loan you have to pay back.
How long does a lender look at my bank statements? Most lenders review your financial activity for the 60 days prior to your application.
Will buying furniture on a “no interest” plan hurt my approval? Yes. Even if there is no interest, the new debt obligation is added to your DTI and can hurt your approval status.