Co-Ownership Equity Split Calculator
How the proceeds of a jointly owned home divide between two owners who put in unequal amounts, under three methods people use, with principal paid worked out from the mortgage.
Result
Enter how the proceeds are split to see the result.
https://calcgallery.com/real-estate/co-ownership-equity-split-calculator/
Results are arithmetic from the numbers you enter, not investment, lending, tax or valuation advice. The site supplies no rents, prices, cap rates or market data, and whether a deal is sound depends on facts no calculator can see. Read the full disclaimer
How to use the Co-Ownership Equity Split Calculator
- Choose how the proceeds are to be split. The page opens with no method chosen, because the choice belongs to the owners.
- Enter the sale price and selling costs, or for a buyout the agreed value and no selling costs.
- Enter the original mortgage, its rate and term, and how many monthly payments have been made. The page works out the principal repaid and the payoff.
- Enter each owner's down payment and any improvements they paid for, and the share of the mortgage payments Owner A made.
- For the money-back or fixed methods, enter Owner A's agreed share, then read what each owner receives.
The three methods
net proceeds = price − selling costs − loan payoffput in = down payment + principal repaid × share of payments + improvementsin proportion: each receives net × (their amount put in ÷ total put in)money back first: each receives their amount put in + (net − total put in) × agreed sharefixed split: each receives net × agreed shareWhen the proceeds are smaller than the total put in, the money-back method has no gain to split and falls back to sharing in proportion.
Principal repaid, from the loan itself
Most of an early mortgage payment is interest. Five years into a 30-year loan at 6%, less than a tenth of the balance has been repaid, however large the payments felt. The page runs the same payment schedule as the mortgage calculators on this site, cent by cent, so the principal and payoff figures match what a lender’s statement would show for a loan with no extra payments. If you have made extra payments, your statement’s payoff figure is the better one; adjust the months until the payoff matches it.
Unequal down payments, equal payments
The most common question is the one in the worked example: one partner put in more at the start, and both have paid the mortgage equally since. In proportion, the larger early contribution keeps its weight in the gain as well. With money back first, each gets their own contribution returned and the gain is split by the agreed share, so the difference between the two methods grows as the home rises in value. A fixed split ignores contributions altogether. Written down before buying, any of the three avoids having to choose later.
What the diagram shows
For each owner, a bar for what they put in and, once a method is chosen, a bar for what they receive, on one scale.
With your numbers
- Net proceeds = $500,000.00 − $30,000.00 − $297,774.07 payoff = $172,225.93
- Put in: Owner A $71,112.97, Owner B $41,112.97, with $22,225.93 of principal repaid split by payment share
- Money put in returned first, the rest split by an agreed share: Owner A $101,112.97
- A fixed split agreed at the start: Owner A $86,112.97
- In proportion to what each put in: Owner A $109,132.50, Owner B $63,093.43
Quick reference
Arithmetic only. What each owner is entitled to depends on your written agreement and the law where the home is, which vary.
| Example | Owner A receives |
|---|---|
| In proportion, 60,000 and 20,000 down | $109,132.50 |
| Money back first, then 50/50 | $101,112.97 |
| Fixed 50/50 split | $86,112.97 |
| Money back first after a fall in price | $33,093.43 |
| Cash purchase, 70/30 | $315,000.00 |
| One owner paid the down payment, payments shared | $152,477.05 |
| Buyout at an agreed value, 70/30 fixed | $141,558.15 |
Common questions about the Co-Ownership Equity Split Calculator
- Which method is fair?
- The page does not say, because each has a reasonable case. Splitting in proportion treats every dollar put in alike. Returning money first protects what each person contributed and shares only the gain. A fixed split honours whatever the owners agreed at the start, whatever happened later. The working below the result shows all three, so the difference is visible.
- Why is only principal counted, not the whole mortgage payment?
- Principal is the part of each payment that becomes equity. Interest, property tax and insurance are spent, much like rent, and do not increase what the home is worth to its owners. Some couples agree to count them anyway; if so, add the difference to each owner's improvements.
- How does this work for a buyout?
- Enter the value you have agreed or had appraised as the price, and zero selling costs if nothing will be sold. Owner B's figure is then what Owner A would pay to take over B's part, before any refinancing costs. The loan payoff is still taken off, since the owner who stays takes on the mortgage.
- What if the home sold for less than we paid?
- Under the money-back method there is not enough to return everything, so the page shares what there is in proportion to what each put in, and the note says so. If the sale does not even cover the loan, every method shows each owner's part of the shortfall. Your agreement may say otherwise.
- Does this decide who owns what legally?
- No. Ownership shares follow the deed, any written agreement between the owners and the law where the home is, and those vary a great deal between countries and states. This page is the arithmetic of the options, not advice on which one applies.