The difficulty with this arrangement was that the lender was absolute owner of the property and could sell it, or refuse to reconvey it to the borrower, who was in a weak position. Increasingly the courts of equity began to protect the borrower's interests, so that a borrower came to have an absolute right to insist on reconveyance on redemption. This right of the borrower is known as the "equity of redemption".

This arrangement, whereby the mortgagee (the lender) was on theory the absolute owner, but in practice had few of the practical rights of ownership, was seen in many jurisdictions as being awkwardly artificial. By statute the common law position was altered so that the mortgagor would retain ownership, but the mortgagee's rights, such as foreclosure, the power of sale and the right to take possession would be protected.

In the United States, those states that have reformed the nature of mortgages in this way are known as lien states. A similar effect was achieved in England and Wales by the Law of Property Act 1925, which abolished mortgages by the conveyance of a fee simple. In the U.S. mortgages got really started in 1934. In that year the Federal Housing Administration lowered the down payment requirements by offering 80 loan-to-value loans. Next, banks, insurance companies, and other lenders followed the example. The FHA also lengthened loan terms by first introducing 15-year loans to supplant 3, 5, and 7-years loans which ended with a balloon payment.

Until the 1930s only 40% of households owned homes, the rate today is nearly 70%.

In 2003, total U.S. residential mortgage production reached a record level of $3.8 trillion through record low interest rates (though these continue to vary according to credit rating.

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