What a mortgage preapproval is and why lenders require one

A mortgage preapproval is a lender's written statement that they will loan you up to a specific dollar amount, based on your financial information at that moment. It is not a may provide — the lender can still say no when you actually buy a house — but it tells sellers you have already passed the initial financial screening. Banks and mortgage companies use preapproval to filter out borrowers who cannot support a loan before spending time on a full process.

The preapproval process exists because mortgage lending is expensive for the lender. Underwriting a full process — ordering appraisals, verifying employment, pulling title reports — costs the lender money. A preapproval lets them do a quick financial check first. If you fail that check, they stop there. If you pass, you move forward knowing both you and the lender are serious.

For you, preapproval serves two purposes. First, it shows real estate agents and sellers that you can actually borrow money, which makes your offer more competitive. Second, it forces you to learn your actual borrowing power before you fall in love with a house you cannot afford. Many first-time buyers skip this step and waste weeks on a house that never would have been approved for financing.

Key Takeaways

  • Preapproval requires you to submit tax returns, pay stubs, bank statements, and permission for a credit check, but does not lock in an interest rate or require a property.
  • Lenders check your credit score, debt-to-income ratio, employment history, and cash reserves to decide how much they will lend.
  • A preapproval letter is valid for 60 to 90 days in most cases, and your credit score or financial situation can change during that window.
  • Preapproval is different from prequalification — prequalification is a rough estimate based on what you tell the lender, while preapproval requires documentation.
  • You can shop for rates among multiple lenders within a two-week window without each inquiry damaging your credit score separately.

The documents lenders ask for and why they matter

When you start a preapproval, the lender will ask for the same documents they would need for a full process, but they will move faster because they are not ordering an appraisal or title search yet. Expect to provide two years of tax returns (both individual and business if you are self-employed), recent pay stubs (usually the last two months), and bank statements showing your savings and checking accounts.

Lenders ask for tax returns because they want to see your actual income over time, not just what you claim on a job process. Pay stubs show current income, but tax returns show whether that income is stable or whether you had a one-time bonus. Bank statements prove you have the down payment saved and show your spending patterns — lenders want to see that you are not carrying hidden debt or spending recklessly.

You will also need to authorize a credit check. The lender will pull your credit report from all three bureaus (Equifax, Experian, and TransUnion) and calculate your credit score. They use this to decide whether to lend to you at all and what interest rate to offer. If you have recent late payments, high credit card balances, or collections accounts, this is where the lender will find them.

How lenders calculate how much they will lend you

Lenders use a formula called the debt-to-income ratio to decide your maximum loan amount. They add up all your monthly debt payments — car loans, student loans, credit cards, child support, any existing mortgage — and divide by your gross monthly income. Most lenders will not lend to you if this ratio exceeds 43 percent, though some will go to 50 percent if your credit score is very strong.

Here is how it works in practice. If you earn $5,000 per month gross and have $800 in existing debt payments, your current ratio is 16 percent. A lender might allow you to add a mortgage payment of up to $1,350 per month, bringing your total to $2,150 and a ratio of 43 percent. The actual loan amount depends on interest rates and loan term, but the lender works backward from that monthly payment number.

Lenders also look at your credit score, which affects both whether they will lend and what rate they offer. A score above 740 typically qualifies for the best rates. Scores between 620 and 739 still may have access to for conventional loans, but at higher rates. Scores below 620 usually require government-backed loans (FHA, VA, or USDA) or are rejected outright. Your score also influences how much cash reserves the lender requires you to have after closing.

Employment history matters because lenders want to see stability. A job change a few months ago is usually fine, but if you have switched jobs every year or have gaps in employment, the lender will ask for an explanation. Self-employed borrowers face extra scrutiny — lenders typically want two years of tax returns and may require a CPA letter confirming your income.

The steps to get preapproved and what happens at each one

Start by contacting a mortgage lender directly or through a mortgage broker. Lenders include banks (Chase, Bank of America, Wells Fargo), credit unions, and mortgage-specific companies (Rocket Mortgage, Better.com, LoanDepot). A mortgage broker works with multiple lenders and can shop your process around. Either way, you will fill out an initial form with your name, income, assets, and debts.

The lender will then ask for the documents listed above. You can upload these through their website or email them. The lender's processor will review everything for completeness and order the credit check. This stage usually takes one to three business days. If documents are missing or unclear, the lender will ask you to resubmit or explain.

Next, an underwriter reviews your file. They verify that your income, employment, and assets match what you claimed. They may contact your employer directly or ask for a letter from your bank confirming your account balances. This stage takes two to five business days. If everything checks out, the underwriter issues a conditional preapproval — meaning you are approved pending final verification closer to closing.

Once you have conditional preapproval, the lender issues a preapproval letter with a specific loan amount, the interest rate they are offering, and the conditions you must meet. This letter is what you show to real estate agents and sellers. The letter is typically valid for 60 to 90 days. If you have not found a house and made an offer by then, you will need to reapply or update your information.

Why your preapproval can change or expire

A preapproval is based on your financial situation on the day you submit your documents. If your credit score drops, your income changes, or you take on new debt, the preapproval becomes less reliable. Some lenders will re-check your credit score before you make an offer; others will not check again until you are in contract on a specific house.

The most common reason a preapproval expires is straightforward time. Most preapproval letters are valid for 60 to 90 days. After that window closes, the lender's interest rate quote is no longer may provide, and your financial situation may have changed. If you are still house hunting after 90 days, contact your lender and ask them to refresh your preapproval. This usually takes a few days and may involve a soft credit pull (which does not affect your score).

Avoid making large purchases or opening new credit accounts while you are preapproved and house hunting. A new car loan or credit card will increase your debt-to-income ratio and may reduce the amount the lender will approve. Similarly, do not change jobs or have a gap in employment. If you must change jobs, tell your lender when ready — they may ask for a new employment verification letter.

Preapproval versus prequalification and other terms lenders use

Prequalification is an informal estimate based on information you provide over the phone or online. The lender does not verify anything — they take your word for your income and debts. A prequalification letter has almost no weight with sellers because the lender has not actually checked your finances. It is useful only as a starting point to understand your rough borrowing range.

Preapproval, by contrast, requires documentation and a credit check. It is a real commitment from the lender that they will lend you the stated amount if you find a house and meet the conditions listed in the letter. Sellers and agents treat preapproval as credible because the lender has verified your information.

Once you are in contract on a specific house, you move into the full process stage. This is when the lender orders an appraisal, title search, and homeowners insurance quote. The appraisal confirms the house is worth at least what you are paying for it. This stage takes 7 to 14 days and is where most loans either get approved or denied, because the appraisal can reveal problems with the property.

How to shop for rates without damaging your credit

When you are preapproved, you can contact multiple lenders and ask for rate quotes. Each lender will pull your credit to give you an accurate quote. Normally, each credit pull lowers your score slightly. However, credit scoring models treat mortgage inquiries specially — if you shop for rates within a 14-day window (some models allow 45 days), all the inquiries count as a single inquiry for scoring purposes.

This means you can contact three or four lenders, get preapproval from each, and compare their rates and fees without your credit score taking multiple hits. After 14 days, the window closes and additional inquiries will be counted separately. So if you are going to shop around, do it all within two weeks.

When comparing preapproval offers, look at the interest rate, the loan origination fee (usually 0.5 to 1.5 percent of the loan amount), and any other lender fees. A lower rate is not always the best deal if the fees are much higher. Ask each lender for a Loan Estimate form, which shows all costs in a standardized format. This makes comparison easier.

Frequently Asked Questions

Does preapproval may provide the lender will give me the loan?

No. Preapproval means the lender has verified your finances and is willing to lend you that amount, but they can still deny you if the appraisal comes back low, your employment status changes, or you fail a background check. The full loan is not may provide until you close on the house.

What if my preapproval expires before I find a house?

Contact your lender and ask them to refresh your preapproval. This usually involves a soft credit pull and takes a few days. If your financial situation has changed significantly, the lender may reduce the amount they will lend or increase the interest rate they are offering.

Can I get preapproved with a low credit score?

Yes, but with limitations. Scores below 620 typically require FHA loans, which have higher insurance costs. Scores between 620 and 680 may have access to for conventional loans but at higher rates. The lower your score, the more cash reserves and down payment the lender will require.

Do I have to use the lender I got preapproved with?

No. A preapproval letter from one lender does not obligate you to use them for the actual loan. You can shop around and switch to a different lender when you make an offer. However, switching lenders late in the process can delay closing, so it is better to choose your lender during the preapproval stage.

What happens if I get preapproved but then lose my job?

Tell your lender when ready. If you lose your job before closing, the lender will likely deny the loan because you no longer have the income you claimed. If you find a new job quickly, the lender may ask for a new employment verification letter. The longer the gap between jobs, the harder it is to get approved.