A reverse mortgage (or lifetime mortgage) is a loan available to seniors, and is used to release the home equity in the property as one lump sum or multiple payments. The homeowner's obligation to repay the loan is deferred until the owner dies, the home is sold, or the owner leaves (e.g., into aged care).
In a conventional mortgage the homeowner makes a monthly amortized payment to the lender; after each payment the equity increases within his or her property, and typically after the end of the term (e.g., 30 years) the mortgage has been paid in full and the property is released from the lender. In a reverse mortgage, the home owner makes no payments and all interest is added to the lien on the property. If the owner receives monthly payments, or a bulk payment of the available equity percentage for their age, then the debt on the property increases each month.
If a property has increased in value after a reverse mortgage is taken out, it is possible to acquire a second (or third) reverse mortgage over the increased equity in the home. But in certain countries (including the United States), a reverse mortgage must be the only mortgage on the property.
Requirements
To qualify for a reverse mortgage in the United States, the borrower must be at least 62 years of age. There are no minimum income or credit requirements, but there are other requirements and homeowners should make sure that they qualify for the loan before they invest significant time or money into the process. For most reverse mortgages, the money can be used for any purpose; however, the borrower must pay off any existing mortgage(s) with the proceeds from the reverse mortgage and, if needed, additional personal funds. A pending bankruptcy which has not been finalized may, however, slow the process. Some types of dwellings do not qualify, while others (like mobile homes) have special requirements (such as being on an approved permanent foundation and built after 1976) in order to be approved. Before borrowing, applicants must seek third party financial counseling from a source which is approved by the Department of Housing and Urban Development (HUD). The counseling is a safeguard for the borrower and his/her family, to make sure the borrower completely understands what a reverse mortgage is and how one is obtained. The current lending limit (the maximum the home can be appraised for, no matter how much it's worth) is $625,500. This was increased in 2009, after being raised from $200,000 to $417,000 in 2008. The maximum an originator can charge for a loan origination fee on a reverse mortgage is $6,000.
The older the individual is, the more lenient the qualifications become, as the mortality rate increases with age. Once you make application and have been given the proper information and consultation with a seasoned professional, you will be required to attend a counseling session given by a HUD approved counselor (in the US). These sessions typically cost anywhere between $ 100 - $ 125 (in the US) although some agencies receive federal grants which allow them to provide it for free. This allows another opportunity to ask all the necessary and proper questions. During the loan and the remainder of its life, you cannot be asked to leave the property, as you still are the owner and deed holder. This is the case whether you outlast the performance of the loan or not. As far as your heirs go, they are still entitled to the property upon your passing. The estate will be settled in the normal way, the property will be passed on to the heirs, and they can refinance out of the reverse mortgage. If they decide not to reside in the property, they can sell the unit, pay off the reverse mortgage, and keep the balance of the monies of the estate. They have one year, from the passing of the note holders, to settle the mortgage.
Reverse mortgage proceeds
The amount of money available to the consumer is determined by five primary factors:
The appraised value of the property, whether any health or safety repairs need to be made to the house, and whether there are any existing liens on the house.
The interest rate, as determined by the U.S. Treasury 1 year T-Bill, the LIBOR index or 1 Year CMT.
The age of the senior (The older the senior is, the more money he/she will receive).
Whether the payment is taken as line of credit, lump sum, or monthly payments. Line of credit will maximize the money available, while lump sum provides the cash immediately, but the interest fees are the highest. Monthly payments are set up as a "Tenure" payment. Borrowers receive them for the rest of their lives no matter how long they live.
The value of the property, and whether that value is higher than the national loan limit set by HUD.
All these factors contribute to the Total Annual Lending Cost (TALC) as defined by the US Federal Government Regulation Z, the single rate which includes all the loan costs. The specific formulas to calculate the impact of the factors listed above can be found in Appendix 22 of the HUD Handbook 4235.1.
There are reverse mortgages for homes valued over the maximum limit. These are called "Jumbo" reverse mortgages, and are generally offered as proprietary reverse mortgages. For homeowners of higher-valued homes, a Jumbo loan can provide a larger loan amount. However, these loans are currently uninsured by the FHA and their fees are often higher.
Mortgage lender A mortgage lender is an investor that lends money secured by a mortgage on real estate. In today's world, most lenders sell the loans they write on the secondary mortgage market. When they sell the mortgage, they earn revenue called Service Release Premium. 
BorrowerA mortgagor is the borrower in a mortgage—they owe the obligation secured by the mortgage. Generally, the debtor must meet the conditions of the underlying loan or other obligation and the conditions of the mortgage. Otherwise, the debtor usually runs the risk of foreclosure of the mortgage by the creditor to recover the debt. 
Other participantsBecause of the complicated legal exchange, or conveyance, of the property, one or both of the main participants are likely to require legal representation.