Equity sharing is another name for Shared Ownership or Co-Ownership. It takes one property, more than one owner, and blends them to maximize profit and tax deductions. Typically, the parties find a home and buy it together as co-owners, but sometimes they join to co-own a property one of them already owns. At the end of an agreed term, they buy one another out or sell the property and split the equity.
Equity sharing in different countries
Equity sharing became desirable in the United States when in 1981 Section 280A of the Internal Revenue Code allowed mixed tax use of a single property for the first time permitting the Occupier to claim principal residence tax deductions and the Investor to claim investment property tax deductions. Attorney and real estate broker Marilyn Sullivan formalized the transaction throughout the 1980s and popularized the concept in her books, The Complete Guide to Equity Sharing  and The New Home Buying Strategy  and in countless radio, newspaper  and television interviews. Since shared ownership is conferred by the federal tax code, this ownership vehicle can be used in any state.
Types of Equity Shares in the United States
There are three structures from which to choose: the Traditional, the Co-occupier and the Joint Venture. In the more popular Traditional Transaction, Party 1 (the Investor) provides the down payment while Party 2 (the Occupier) lives in the property and pays its expenses. The greatest advantage to the Occupier is to achieve home ownership long before s/he could save up a down payment. The Investor's greatest advantage is to capitalize on the home's appreciation without paying its expenses. Often the Investor is a family member of the Occupier, helping a relative to buy a first home while also earning a good return on investment.
A seller also makes an ideal Investor in the Traditional Transaction when he agrees to fund the down payment for a cash poor, but credit worthy, wanna-be homeowner. From the loan he and the Occupier obtain, the seller cashes out with at least 80% of value and turns possession of the property and its expenses over to the Occupier. The down payment amount left in the property as equity is converted to the Seller’s investment in the home. By cashing out and moving on, yet continuing to co-own the home and share in its appreciation and generous tax breaks, the Seller gets the best of both worlds while the previously renting Occupier is finally a homeowner with all the tax breaks built in.
In the Co-Occupier Transaction all owners are Occupiers sharing in acquisition costs and ongoing expenses. In the Joint Venture Transaction all parties are Investors who join together to co-own a property as an investment. 
There are many uses of the term "Equity Sharing" in the UK. Often applied to different forms of Low Cost Home Ownership schemes. These include Equity Loans, sometimes referred to as Equity Sharing Loans and some forms of Shared Ownership (part buy/part let) leasehold schemes being referred to as an Equity Sharing Lease. Some local authorities may also refer to resale price restrictions under planning documentation as being Equity Sharing arrangements.
The UK government facilitates shared equity chiefly through the Homes and Communities Agency. As of 2009[update] this was under the banner of HomeBuy. This aims to help households earning up to £60,000 p.a.
New Build HomeBuy is where purchasers buy at least 25% of a newly built home, and pay rent on the remainder. The HCA generally subsidises housing associations or other providers to hold the remaining share. The rent is capped at 3% of the value of the unsold share, but typically set at 2.75%. Purchasers may buy additional shares whenever they can afford to do so; this is known as "staircasing".
HomeBuy Direct was introduced in 2009, under which the government and a housing developer jointly fund an equity loan of 30% of the valuation, so that the purchaser only needs to pay a mortgage on 70% of the value. If the purchaser buys an additional share, all three parties participate in any increase in value. The HCA allocated £300 million to the scheme for 2009—2011, and 10,000 homes are available under the initiative.
Open Market Homebuy allowed purchasers to buy at least 25% of a property on the open market, with a conventional mortgage on that part, and a low-interest loan on the remainder. This is not currently available as the funding for 2009-10 has already been fully committed.
FirstBuy a scheme for first-time buyers announced in the 2011 Budget. Under it first-time buyers can get help to fund the difference between a 5% deposit and a 75% mortgage. It is only available on selected newbuild schemes. The top-up equity is provided in equal shares by the HCA and the developer.
Private sector shared equity or, as it is sometimes known, investor shared equity, operates quite differently in that there is no element of taxpayer subsidy. Instead, third party investors provide the difference between the buyer's deposit and (typically) a 75% mortgage, in return for an equity stake in the property and a rent. These schemes are run over 5 or 10 years (sometimes with a 'hardship' extension), meaning that at the end of the relevant period, the owner has to buy out the equity stake at the relevant percentage of the then market value. There is generally no penalty on early redemption or partial buy-backs. Thus, equity sharing can be seen as a step up to full ownership of a property.
Although investor shared equity is, on the face of it, more expensive than public sector schemes, because of the need to pay rent on the non-owned portion, it nevertheless holds significant advantages:
- First, it is not confined to newbuild, or to any particular housing provider. Instead, the buyer can research the whole of the market for the best bargain. Some would say this avoids the peril of paying an inflated price to a housebuilder.
- Secondly, there is less in the way of form filling and waiting lists. Because investor shared equity is essentially a financing mechanism, it is as simple as applying for a mortgage.
- Thirdly, it is less likely to run out of funding than public sector schemes. So long as investors achieve their desired return, the resources are theoretically limitless.
- Fourthly, the buyer is put in the position of a cash buyer and is thus empowered to negotiate the best deal with the vendor.
- Finally, of course, an injection of cash gives the buyer the chance to access the better interest rates and lighter credit checks associated with 75% mortgages.
- Sullivan, Marilyn (1991, 1993). The Complete Guide to Equity Sharing: Everything you Need to Know to Create Profitable Equity Sharing Transactions. San Francisco, CA: Venture 2000 Publishers. ISBN 0-9629239-0-7. Check date values in:
- Sullivan, Marilyn (1997). The New Home Buying Strategy: Solve Your Cash Crunch With Team Buying Power. San Francisco, CA: Venture 2000 Publisheres. ISBN 0-9629239-1-5.
- Ransom, Diana (July 9, 2007). "A Little Help, Please". Wall Street Journal. Retrieved July 9, 2007.
- Ransom, Diana (12/2/2008). "Putting Your House to Work". Wall Street Journal. Retrieved 12/2/2008. Check date values in:
- "Shared Ownership Joint Venture Equity Share Contract by Attorney". msullivan.com. Retrieved 2016-01-24.
- Marilyn Sullivan (2016-01-26), EQUITY SHARING PRESENTATION BY THE EXPERT, retrieved 2016-01-26
- HomeBuy Direct on DCLG website
- New Build HomeBuy on DCLG website
- Open Market HomeBuy on CLG website
- Social HomeBuy at HCA website
- HomeBuy Agents list on HCA website
- Geltner, David M., Norman G. Miller and Jean Snavely. 1995. We Need a Fourth Asset Class: HEITs. Real Estate Finance: 71-81.
- Caplin, Andrew (1997). Housing Partnerships: A New Approach to a Market at a Crossroads. MIT Press. ISBN 0-262-03243-0.