Shared Appreciation Mortgage (SAM)

A Shared Appreciation Mortgage is a home loan where you give the lender a percentage of your home's future price increase in exchange for a below-market interest rate, help with the down payment, or other upfront financial assistance. When you eventually sell or refinance, you pay the lender back the original loan balance plus their agreed-upon share of the appreciation. The lender's share typically ranges from 25% to 75% of the gain, depending on what benefit you received upfront.

Think of a Shared Appreciation Mortgage like giving a contractor a stake in future rent increases in exchange for lower build costs now.

How the Math Works in Practice

Say you buy a home for $300,000 using a Shared Appreciation Mortgage with a 25% appreciation share and a 50% loan-to-value ratio. Ten years later, you sell for $500,000. The home appreciated by $200,000. The lender collects 25% of that gain, which equals $50,000, on top of repayment of the original loan balance. Your net equity is the remaining $150,000 of appreciation plus any equity you built through principal paydown, minus closing costs.

The lower interest rate on the front end reduces your monthly payments. But the back-end cost, the appreciation share, can easily exceed what you would have paid in additional interest on a conventional mortgage if your home rises significantly in value.

Who Uses Shared Appreciation Mortgages

Shared Appreciation Mortgages are not widely available through standard lenders. They appear most often in three situations.

• First-time homebuyer programs: Government agencies and nonprofits use Shared Appreciation Mortgages as a form of down payment assistance. The agency contributes funds toward the purchase in exchange for a share of appreciation when the home is sold, allowing buyers with limited savings to enter the market.
• Loan modifications: Lenders occasionally offer Shared Appreciation Mortgages to distressed homeowners to reduce monthly payments and avoid foreclosure. The modification gives the homeowner breathing room now in exchange for a portion of future equity.
• House flippers: Investors renovating properties for quick resale sometimes use Shared Appreciation Mortgages because the lower carry cost during renovation reduces expenses on short-hold deals where the appreciation share may be modest.

The Risk Side of the Trade

The shared appreciation clause only activates if the home gains value. If the home stays flat or declines, you repay the loan principal with no appreciation penalty. That sounds attractive, but there is still a meaningful risk in rising markets.

If your home doubles in value over 20 years, a 30% appreciation share could cost you more in dollar terms than you saved on interest over the same period. The longer you hold the home and the faster the local market rises, the more expensive the Shared Appreciation Mortgage becomes relative to a conventional loan with a higher starting rate.

Sources:

• https://www.bankrate.com/mortgages/shared-appreciation-mortgage/
• https://en.wikipedia.org/wiki/Shared_appreciation_mortgage
• https://www.unlock.com/blog/home-equity/shared-appreciation-mortgage-all-you-need-to-know/
• https://homebuyer.com/glossary/shared-appreciation-mortgage-sam