Anything on letterhead with a verified financial institution which includes a name & signature with contact information for same and the knowledge that a call and respective emails will be made. It shall also entail the full amount necessary to consummate the transaction. 

When representing buyers I include a copy of a statement with the balance or a letter on a institution's letterhead signed by a representative'phone contact information.  Depending on market conditions, there may be additional information submitted.

For sellers:  use the submitted information and then verify with the sources.  Ask for additional information if not sufficient or suggest seller reject if necessary.  

Statement from financial institution to the effect that liquid assets exist. 

We require CURRENT (within past 30 days) Bank Statement(s) or financial statements proving the funds are available to close.

I would like Bank letterhead stating the name of the customer and confirming funds sufficient to do a real estate transaction in the amount of X available as of X date.

Current bank statement (within last 30 days) in the name of the person making the purchase.  I no longer accept "verified" bank statements. 

Here's why: Years ago, I listed a short sale. The owner was also an independent broker who did loans as well as real estate.  We know that short sales need to be arms-length.  The buyer was a friend of the seller who lived next to a relative of the seller who gave the buyer $700K to buy the home.  Yes, the money was in his account in his name BUT had we seen the statement, we would have seen one lump sum of $700K was deposited into the account.  

Can you say .... F R A U D ????

The lender had a red flag on that account.  They were watching it carefully.  When the buyer refused to sign the lenders arms-length "warning" letter that talked about federal offense and going to jail ... 

For a regular sale, said letter may be acceptable with verification. 

Nuff said. 

Letter from the buyer's banker or a copy of their bank statements.

Copy of account(s) with name clearly stated & all account numbers can be blacked out. Current dates which in this case worst would be Dec.

on bank letterhead, and signed by someone of authority, the statement reflecting the buyer has as of that date the total sum needed to close on the property....

Caroline,

On the high end, people offer their private banker's phone number.  In commercial real estate, it was letter of credit with international clients on which the monthly lease amount was drawn...Some lease considerations were over several million dollars.  A

Current statements IN WRITING - anyone can pose as a banker/financial planner by phone so, it always has to be in writing.

A current bank statement and the banks phone number.

Depending on the deal...I may even have to speak to the bank

Account #, password and transfer code.

Overwhelmingly, all I get is a statement that shows a cash balance.

The answer is in the word proof.

Excellent answers here.

I ook for a copy of an account with enough money for the purchase or a letter from a local and trusted bank. I also look at lines of credit and letters from known hard money lenders for some. 

A key part of getting proof of funds is getting proof that the funds are LIQUID.  Too many times, I'll receive a stock fund statement or a retirement fund where these funds would need to be sold in order to get the cash.  Sometimes when a buyer realizes there are taxes and possibly penalties for selling stocks/funds, they don't do it.  

Piles of cash are nice, but a letter from your bank will often do the job.

Bank Statement no older than 30 days or a letter from a financial divisor that can verify the information you need.  

A bank letter.

Their Account statement or a letter from their bank on bank letterhead stating that they have $ X amount of dollars. 

A bank statement or a letter from a bank manager/financial advisor that the buyer has sufficient funds to purchase the property at the offered price.

A Bank letter.  On Bank Letterhead.

Depends.

A copy of a current bank statement will do nicely. I have also accepted letters from the buyer's banker attesting to the adequacy of a certain amount of funds on deposit.

Bank statement or copy of a cashier's check.

 Bank statements.... Those blah blah out of the area Capital Investments I have a bad feeling. I want bank or wealth management statements. August is probably OK but they need to send you the latest in 24 hours...

A few homes here require proof of funds before showing....

Many of the answers provided here. The acid test: verifiable, current documentary evidence of liquidity owned and at the disposal by the buyer that matches or exceeds the funds required to close the transaction. A matter of buyer disclosure. Anything otherwise is fraud.

A letter from institution holding the funds

A letter from the bank or financial advisor.

A large good faith deposit and a letter from a bank institution with accompanying current account statements 

Current Bank statement or letter from their financial adviser w/ verification of funds to close.

What even the clients wants.  I don't set the requirements, I am just the agent.

Bank statement usually, no older than 2 months. Or any legal document( letter from a bank for the mentioned amount, an attorney confirmation, a financial document of the asset they are liquidating, etc.)

Bank statements that are currant.  I have  also had a signed letter from their attorney that funds will be available at settlement.

Letter from bank or bank sheet.redacted of numbers .

A statement within 30 days showing institution, name of buyer and amount.  Just closed a deal where the agent said she has NEVER had to present proof of funds for a cash deal.    Goodness, never heard of that before! 

Current bank statement,  or a letter from the bank on a letterhead. 

Letter from bank oficial at min.

Yup!

We have accepted a letter from a bank holding the funds to confirm they are there. 

A letter from the bank that states that the buyer is able to purchase the property at the accepted offer price.  Address of the listing must be on the letter and provided within 3 days of the accepted offer.