Stop These 5 Common Mortgage Mistakes That Derail Your Home Loan Approval

If you are about to apply for a home loan, you already know the stakes: a misstep can push back your closing date, raise your interest rate, or even kill the deal. But what exactly trips up most buyers? We have looked at dozens of real-world scenarios and talked to loan officers who see the same patterns repeat. This guide covers five common mortgage mistakes that derail approvals — and what to do instead.

We are writing this for anyone who wants a clear, honest look at the process: first-time homebuyers, people refinancing, and even real estate agents who want to help clients avoid surprises. By the end, you will know exactly which actions to take — and which to avoid — in the weeks and months before you apply.

1. Changing Jobs or Making Large Purchases Before Closing

One of the most frequent mistakes happens between application and closing. Buyers assume that once they are pre-approved, they can relax. But lenders verify your financial picture right up to the day you sign. Changing jobs — even for a higher salary — can disrupt the approval if the new position is in a different field or if you move from salaried to commission-based income. The underwriter may require a longer income history or additional documentation, which can delay closing.

Large purchases are another landmine. We have seen buyers buy a new car, finance furniture, or even open a new credit card for a home improvement store. Each of these actions increases your debt-to-income ratio (DTI) and can trigger a re-evaluation of your loan. In some cases, the lender may require you to pay off the new debt before closing, or they may deny the loan altogether if the DTI exceeds their limit.

What to do instead

Keep your financial life as stable as possible from pre-approval through closing. Do not change jobs unless absolutely necessary. If you must change, talk to your loan officer first to understand how it will affect your timeline. Put off any major purchases — even if you plan to pay cash, because the lender will see the withdrawal and ask questions. Wait until after closing to buy furniture, a car, or appliances.

2. Ignoring Your Credit Score Until Application Day

Your credit score is one of the first things a lender checks, and it directly influences the interest rate you are offered. Yet many buyers never look at their credit report until they sit down with a loan officer. By then, it is often too late to fix errors or improve your score. Credit reports can contain mistakes — accounts that are not yours, incorrect late payments, or outdated balances. Fixing these takes time, sometimes weeks or months.

Even if your report is accurate, you might have a lower score than you expected because of high credit card utilization, a short credit history, or a recent late payment. Lenders use different scoring models, and the score you see on a free app may not be the same as the one the lender pulls. This discrepancy can lead to surprises at application time.

What to do instead

Check your credit report from all three bureaus (Equifax, Experian, TransUnion) at least six months before you plan to apply. Dispute any errors immediately. Pay down credit card balances to below 30% of your limit, and avoid opening new accounts. If your score is lower than you need, ask a loan officer what the minimum is for the loan program you want, and work on improving your score before you apply. Even a 20-point increase can save you thousands over the life of the loan.

3. Underestimating the Importance of a Stable Income History

Lenders want to see that you have a reliable income stream that will continue into the future. They typically look at two years of employment history in the same field. If you are self-employed or work on commission, they will ask for tax returns and profit-and-loss statements. Any gap in employment or a shift to a completely different industry can raise red flags.

The mistake many buyers make is assuming that a high current income is enough. But if you recently switched from a salaried job to freelance work, the lender may want to see at least a year of self-employment tax returns. Similarly, if you took a pay cut to switch careers, the lender may use your lower current income — not your previous salary — to qualify you.

What to do instead

Before you apply, gather documentation that shows stable income: W-2s, pay stubs, tax returns, and bank statements. If you are self-employed, have a profit-and-loss statement ready for the most recent quarter. Avoid changing jobs or income structure in the months before you apply. If you anticipate a change, discuss it with your loan officer early so they can advise you on the best timing.

4. Failing to Shop Around for the Best Rate and Terms

Many buyers accept the first loan offer they receive, often from a bank where they already have an account. That can be a costly mistake. Different lenders offer different interest rates, fees, and terms for the same loan product. A difference of just 0.25% in interest rate can add up to thousands of dollars over 30 years. But shopping around is not just about the rate — you also need to compare origination fees, discount points, closing costs, and the fine print on prepayment penalties or rate locks.

Some buyers worry that applying with multiple lenders will hurt their credit score. While each application triggers a hard inquiry, credit scoring models treat multiple inquiries for the same type of loan within a short window (usually 14 to 45 days) as a single inquiry. So you can shop without fear of damaging your score.

What to do instead

Get loan estimates from at least three different lenders — a large bank, a local credit union, and an online lender. Compare the APR (annual percentage rate), which includes both the interest rate and most fees, rather than just the rate. Ask each lender for a breakdown of closing costs. Do not be afraid to negotiate: if one lender offers a lower rate, ask another if they can match it. A little effort upfront can save you money for years.

5. Skipping the Pre-Approval Step

Some buyers start looking at homes before they have a pre-approval letter. They assume they will qualify, or they want to avoid the paperwork until they find a house. But without a pre-approval, you do not know how much you can actually borrow, and sellers may not take your offer seriously. In a competitive market, a pre-approval letter shows the seller that you are a serious buyer who can secure financing.

Pre-approval is different from pre-qualification. Pre-qualification is a quick estimate based on information you provide; pre-approval involves the lender verifying your income, assets, and credit. It gives you a firm loan amount and interest rate, subject to property appraisal. Skipping this step can lead to disappointment when you find a house you love but cannot afford, or when you lose out to another buyer who has their financing in order.

What to do instead

Get pre-approved before you start house hunting. Submit your application, provide the required documents (pay stubs, tax returns, bank statements, and ID), and let the lender pull your credit. Once you have a pre-approval letter, you can shop with confidence knowing your price range. Remember that pre-approval is typically valid for 60 to 90 days, so time your search accordingly.

6. When Not to Follow This Advice

The guidance above applies to most conventional mortgage scenarios, but there are situations where the rules bend. For example, if you are using a government-backed loan like an FHA or VA loan, some requirements differ. FHA loans may allow lower credit scores and higher DTI ratios. VA loans have no down payment requirement and different income stability rules. If you are buying a home with cash, you do not need to worry about these mistakes at all.

Another exception: if you are refinancing with the same lender and have a strong relationship, you may not need to shop around as aggressively. Some lenders offer loyalty discounts or streamline refinancing programs that reduce paperwork. However, it is still wise to compare offers — even a small rate difference matters.

Finally, if you are self-employed and have less than two years of tax returns, you may still qualify through a bank-statement loan or a non-QM (non-qualified mortgage) product. These loans have higher interest rates and require larger down payments, but they exist for borrowers who cannot document traditional income. In that case, the advice about stable income history still applies, but the documentation requirements are different.

7. Frequently Asked Questions

How long before applying should I check my credit?

We recommend checking your credit at least six months before you plan to apply. This gives you time to dispute errors, pay down balances, and improve your score. If you find a mistake, the dispute process can take 30 days or more, so starting early is key.

Can I switch lenders after I have an accepted offer?

Yes, but it can be risky. Switching lenders after an offer is accepted may delay closing because the new lender will need to process your application, order an appraisal, and verify your documents again. If you have a tight closing timeline, it is better to stick with the original lender unless the new offer is significantly better and you have time to spare.

What counts as a large purchase before closing?

Any purchase that increases your monthly debt obligations can be a problem. This includes financing a car, buying furniture on credit, opening a new credit card, or taking out a personal loan. Even paying cash for a large item can be an issue if the withdrawal reduces your cash reserves below what the lender requires.

How many lenders should I apply to?

Three to five lenders is a good range. This gives you enough comparison to find the best rate without overwhelming yourself. Make sure to apply within a two-week window to minimize the credit score impact from multiple inquiries.

Do I need a 20% down payment to avoid mortgage insurance?

For conventional loans, you need at least 20% down to avoid private mortgage insurance (PMI). However, there are loan programs that allow lower down payments — FHA loans require as little as 3.5% down, and conventional loans can go as low as 3% for first-time buyers. Just remember that lower down payments come with higher monthly costs for mortgage insurance.

8. Summary: Your Next Moves

To avoid the common mistakes that derail home loan approvals, start early and stay organized. Here are five specific actions you can take today:

• Pull your credit report from all three bureaus and review it for errors.
• Pay down credit card balances to below 30% of your limit.
• Gather your financial documents: pay stubs, tax returns, bank statements, and identification.
• Get pre-approved by at least three lenders and compare their loan estimates.
• Do not make any major financial changes — no new jobs, no new debt, no large purchases — until after closing.

Mortgage approval is a process of careful preparation. By understanding these five common mistakes and taking steps to avoid them, you put yourself in the strongest position to secure the loan you need and close on time. If you have specific questions about your situation, talk to a loan officer early — they can guide you through the nuances and help you avoid surprises.