8 Ways to Blow Up Your Financing When Buying a Home
Congratulations, your offer was accepted and you’re officially under contract. That’s exciting, but if you’re obtaining a mortgage, this is not the time to let your guard down. A loan approval is conditional, and many buyers don’t realize how easy it is to lose financing after being pre-approved.
Blowing up your financing usually doesn’t happen because of one massive mistake. It happens because of small financial decisions made during underwriting. Below are the eight most common mistakes homebuyers make during the loan process that can delay or completely derail a closing.
What Does It Mean to Blow Up Your Financing?
Blowing up your financing means taking an action after mortgage pre-approval that causes a lender to delay, suspend, or deny your loan before closing. Mortgage lenders continuously re-check employment, income, credit, assets, and debt-to-income ratio throughout the underwriting process. Even small changes can trigger additional review, a higher rate, more conditions, or a loan denial.
Quick Summary: 8 Ways Buyers Lose Loan Approval
- Changing jobs or income
- Making large purchases before closing
- Unnecessary credit inquiries
- Increasing credit card balances
- Moving money out of savings
- Large or unexplained bank deposits
- Late or missed bill payments
- Switching banks during underwriting
The 8 Most Common Financing Mistakes Buyers Make
1. Changing Jobs or Income During the Loan Process
When applying for a mortgage, lenders assess your financial stability and ability to repay the loan. A major component of that evaluation is your employment history and income consistency. Changing jobs, switching from salary to commission, quitting, or reducing hours during underwriting can raise red flags.
Even if your new job pays more, lenders may require additional documentation or time in the new role before income can be used. Some loan programs require a minimum amount of time in a new position before approval.
Lenders also verify employment again right before closing. A last-minute job change can delay or cancel a transaction.
Bottom line: Do not change jobs or income structure until after closing unless your lender explicitly approves it.
2. Making Large Purchases Before Closing
Once buyers find their home, it’s normal to start planning ahead by purchasing furniture, appliances, or even a vehicle. Unfortunately, this is one of the fastest ways to lose loan approval.
Lenders calculate your debt-to-income (DTI) ratio, which compares your monthly debt payments to your gross monthly income. A new payment (even one you consider “temporary”) can change your DTI and trigger a re-review of your file.
Why lenders care about DTI
DTI is calculated by dividing your total monthly debt payments by your gross monthly income.
| DTI Piece | What it Includes |
|---|---|
| Monthly Debt Payments | Minimum credit card payments, car loans, student loans, personal loans, and the estimated new housing payment. |
| Gross Monthly Income | Income before taxes and deductions. |
Simple example: If your monthly debt increases by $300 because of a new financed purchase, that extra payment can push your DTI high enough to cause a loan delay or denial.
Even cash purchases can cause problems if they reduce your available assets or down payment funds. If it’s not a normal living expense, wait until after closing.
Expert tip from Michelle: I once saw a closing nearly fail because a buyer bought a $3,000 sofa on a “no interest for 12 months” plan. Even at 0% interest, the potential monthly payment changed their DTI enough to trigger a manual underwrite. Don’t buy furniture until you have the keys.
3. Allowing Unnecessary Credit Inquiries
Mortgage lenders pull your credit report to assess risk. Multiple mortgage-related inquiries within a short period are typically treated as one. However, inquiries from other sources like auto dealers, credit card companies, or retail financing are not.
Additional credit checks can lower your credit score and signal increased financial risk, which can lead to a higher rate, more conditions, or denial. During the loan process, the only institution that should be pulling your credit is your mortgage lender.
4. Increasing Credit Card Balances
Using credit cards for everyday expenses is common, but increasing balances during underwriting can hurt your loan approval. Higher balances raise your DTI and can lower your credit score.
You should not open new credit accounts or close existing ones during the loan process unless your lender specifically instructs you to do so.
5. Moving Money Out of Savings
The funds you intend to use for your down payment and closing costs should remain stable during underwriting. Moving money between accounts can create documentation issues, delay approval, or trigger additional lender conditions.
Lenders must verify the source and history of funds. Even if you plan to replace the money, unexpected movement can be a problem. If you must move funds, speak with your lender first.
6. Making Large or Unexplained Deposits
Large deposits during underwriting are a major red flag because lenders must confirm the money is legitimate and not borrowed. This is why “money trail” documentation matters.
Lenders typically want to see seasoned funds, which means money that has been sitting in your account for at least 60 days (two full bank statement cycles). Unexplained deposits can trigger requests for documentation, delay approval, or stop the loan process entirely.
Cash deposits can be especially problematic. If you need to deposit money, consult your lender before doing so and keep documentation that clearly shows where the funds came from.
7. Missing or Paying Bills Late
Buying a home can be stressful, and it’s easy to lose track of due dates. However, late payments during underwriting can damage your credit and jeopardize approval.
Some creditors report late payments immediately. If your closing is weeks away, that late payment can still appear before funding. Continue paying all bills on time until after closing.
8. Switching Banks During Underwriting
Changing banks or opening new accounts during the loan process can complicate verification. New accounts require additional statements, transfers, and documentation, which can slow underwriting.
While sometimes unavoidable, switching banks during underwriting should only be done with lender guidance.
How to Protect Your Loan Until Closing
Consistency is the safest strategy between contract and closing. Even actions that seem harmless can create underwriting issues. Before making any financial change, confirm it won’t impact your approval. When in doubt, ask your loan officer first.
Final Thoughts
A mortgage approval is not final until you close. Maintaining financial consistency after you go under contract is one of the most important parts of a successful home purchase. Before making any financial changes—big or small—check with your lender first. A simple question can prevent a costly delay or denial.
Share this article with anyone under contract and financing a home:
Just because you're pre-approved for a mortgage doesn't mean it's a done deal. Here are 8 things to avoid so you don’t blow up your financing before closing. #homebuying #realestateFrequently Asked Questions
Can I buy furniture before closing?
It’s safest to wait. Even “no interest” financing can add a monthly payment and change your DTI. Purchases can also reduce cash reserves needed for closing.
Do lenders check your credit again before closing?
Yes, many lenders do a final credit check shortly before closing. New accounts, inquiries, or higher balances can trigger delays or denial.
What counts as a large deposit for a mortgage?
It depends on the lender and your overall profile, but any deposit that is not part of your normal income pattern can be flagged and require documentation.
What are seasoned funds?
Seasoned funds are funds that have been in your account long enough to show a clear history, typically at least 60 days (two bank statement cycles).
Can I change jobs after being pre-approved?
A job change can require re-verification of income and employment, and it may delay underwriting. Always speak with your lender before making a change.
Should I switch banks while my mortgage is in underwriting?
It’s not recommended. Switching banks often creates extra documentation, transfer questions, and delays. If you must do it, coordinate with your lender first.
About the Author
Michelle Gibson has specialized in residential real estate throughout Wellington, Florida since 2001. She guides buyers, sellers, and renters through every step of the transaction with a focus on preparation, communication, and protecting her clients from costly mistakes.
Areas served include Wellington, Lake Worth, Royal Palm Beach, Boynton Beach, West Palm Beach, Loxahatchee, Greenacres, and surrounding areas.
Michelle Gibson of the Hansen Real Estate Group Inc. who has specialized in Wellington, Florida, real estate since 2001. She combines community knowledge with effective marketing, technology, and social media to help buyers, sellers, and renters throughout Wellington.
Buyers with financing really need to know this and sab\ve any types of purchases until after they close on their new home.