Getting pre-approved for a mortgage feels like a huge win, and it is. But if you haven’t gone through a mortgage pre-approval process with a local expert, small financial changes can still derail your loan before closing.
A mortgage pre-approval is not a guarantee.
Every year, buyers lose homes or face stressful delays because something changed after they were pre-approved. The good news? Almost all of these issues are avoidable.
Below are the seven most common mistakes that can kill your mortgage approval — and exactly how to avoid them.
1. Opening New Credit Accounts
Opening new credit cards or financing purchases after pre-approval can raise your debt-to-income ratio and hurt your chances of final approval. Buyers should understand how credit impacts mortgage approval before making any financial changes.
This includes:
- Credit cards
- Store financing
- Furniture or appliance purchases
- Personal loans
Even if you don’t use the account, it can:
How to avoid it:
Do not open any new credit until after you close on your home.
2. Making Big Purchases Before Closing
Large purchases can drain the funds you need at closing or raise red flags during underwriting. This is why working with a lender who explains what underwriters look for during the mortgage process is so important.
Examples include:
- Buying a car
- Paying for vacations
- Large cash withdrawals
- Moving money between accounts
Lenders must verify that you still have enough funds to close.
How to avoid it:
Keep your spending steady and ask your loan officer before making any large financial moves.
3. Changing Jobs or Income Structure
Changing jobs isn’t always a deal-breaker — but changing income structure often is.
Risky changes include:
- Switching from salary to commission
- Becoming self-employed
- Changing employers mid-process
- Reducing hours or overtime
Lenders value income stability.
How to avoid it:
If a job change is unavoidable, talk to your mortgage professional before making the move.
4. Missing a Payment — Even One
One late payment after pre-approval can cause:
- Credit score drops
- Loan re-underwriting
- Higher interest rates
- Loan denial in severe cases
This includes:
- Credit cards
- Auto loans
- Student loans
- Buy-now-pay-later plans
How to avoid it:
Set reminders or auto-pay for every account until after closing.
5. Large Deposits Without Documentation
Underwriters must document where all funds come from. Buyers often don’t realize how strict these rules are until it’s too late. Reviewing mortgage documentation requirements early can save time and stress.
Common examples:
- Cash deposits
- Transfers from friends or family
- Selling items for cash
- Business income mixed with personal funds
How to avoid it:
Deposit funds early and keep documentation for every large transaction.
6. Letting Credit Card Balances Creep Up
Keeping balances low helps protect your approval and interest rate. Buyers who understand how debt-to-income ratio affects mortgage approval are far less likely to run into last-minute issues.
High balances:
- Raise your utilization ratio
- Lower your credit score
- Increase monthly obligations
How to avoid it:
Keep balances low and avoid running up cards during the loan process.
7. Not Communicating With Your Loan Officer
Silence causes more mortgage problems than almost anything else.
Buyers sometimes assume:
- “It’s probably fine”
- “I’ll mention it later”
- “I don’t want to bother them”
Unfortunately, surprises during underwriting can kill deals.
How to avoid it:
If something changes — income, credit, assets — communicate immediately.
Why These Mistakes Matter So Much
Before closing, lenders:
- Re-check credit
- Re-verify employment
- Re-confirm assets
- Review updated bank statements
What seems small to a buyer can look risky to an underwriter.
The Bottom Line
Pre-approval is just the beginning. If you want to protect your approval and close with confidence, start with a local mortgage pre-approval you can trust and work with a lender who stays involved every step of the way.
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