MortgageUpdated May 18, 2026🕐 3 min read
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How Home Equity Works
Home equity is the difference between the current market value of your property and the outstanding mortgage balance. It represents the portion of the property you own outright. Equity grows in two ways: as you make mortgage payments that reduce the outstanding balance, and as property prices rise. Understanding how equity builds and how to access it is central to property as a wealth-building tool.
Subtract the outstanding mortgage balance from the current market value of the property. If the result is positive, you have equity. If negative, you are in negative equity. Equity as a percentage equals equity divided by property value, multiplied by 100.
Property ValueCurrent market value — not purchase price, but what the property would sell for today
Outstanding Mortgage BalanceThe remaining amount owed to the lender after all payments made to date
Home EquityThe net ownership stake in the property — the amount you would receive if you sold and repaid the mortgage
How equity builds over time
Equity accumulates from two sources. The first is principal repayment — each mortgage payment includes a principal component that reduces the outstanding balance. In the early years of a standard amortising mortgage, the principal component is small and grows over time as the balance falls. On a 25-year mortgage, roughly 30% of total principal is repaid in the first 10 years and 70% in the final 15 years. This front-loading of interest means equity builds slowly at first.
The second source is property price appreciation. If a property worth 300.000 rises to 360.000 over five years (20% appreciation), the owner's equity grows by 60.000 with no additional payments required. Price appreciation is outside the owner's control but has historically been the larger source of equity growth in major cities over long periods.
The two sources can also work against each other. If property prices fall 15% while only 5% of the balance has been repaid on a 90% LTV mortgage, the owner moves from 10% equity to negative equity — the mortgage balance exceeds the property's new value.
For properties purchased with a deposit, equity starts from day one. A 20% deposit on a 300.000 property creates 60.000 in equity immediately. A 5% deposit creates only 15.000. The initial equity cushion determines how vulnerable the position is to price falls in the first years of ownership.
Worked examples
Example 1Equity after 10 years — dual effect
Given: Purchase price: 280.000 | Deposit: 56.000 (20%) | Mortgage: 224.000 at 3,5% over 25 years | Property rises to 340.000 after 10 years
Result: Balance after 10 years: approximately 177.000 | Equity: 163.000 (47,9%) | Equity growth: 107.000
Starting equity: 56.000. After 10 years, balance reduced from 224.000 to approximately 177.000 — repaid 47.000. Property value rose by 60.000. Total equity: 340.000 - 177.000 = 163.000. Growth: 163.000 - 56.000 = 107.000. Of this, 47.000 came from principal repayment and 60.000 from price appreciation. Equity as percentage: 163.000 / 340.000 = 47,9%.
After 2 years of payments, balance has reduced from 237.500 to approximately 231.000 (small reduction because of interest front-loading). Property falls 14% to 215.000. Equity: 215.000 - 231.000 = -16.000. The homeowner owes 16.000 more than the property is worth. They cannot sell without bringing additional cash to cover the shortfall, and refinancing is effectively impossible until prices recover or the balance falls below 215.000.
Example 3Equity release calculation
Given: Property value: 400.000 | Current mortgage balance: 120.000 | Current equity: 280.000 | Maximum LTV for release: 80%
Result: Maximum mortgage after release: 320.000 | Releasable equity: 200.000
Current LTV: 120.000 / 400.000 = 30%. Maximum mortgage at 80% LTV: 400.000 x 80% = 320.000. Releasable equity: 320.000 - 120.000 = 200.000. The homeowner could borrow an additional 200.000 against the equity, bringing the LTV to 80%. This would typically involve refinancing the entire mortgage to a new loan of 320.000 at current market rates.
Home Equity Calculator
Enter your current property value and mortgage balance to calculate your equity, LTV and accessible equity at different LTV thresholds.
Equity build-up — 240.000 mortgage at 3,5% over 25 years on 300.000 property
Year
Remaining Balance
Cumulative Repaid
Equity (flat prices)
Equity at 2% annual growth
1
233.500
6.500
66.500 (22%)
72.500 (23%)
5
212.000
28.000
88.000 (29%)
121.000 (34%)
10
179.000
61.000
121.000 (40%)
186.000 (45%)
15
138.000
102.000
162.000 (54%)
262.000 (57%)
20
88.000
152.000
212.000 (71%)
352.000 (75%)
25
0
240.000
300.000 (100%)
461.000 (100%)
Common mistakes about home equity
✗ Treating equity as liquid savings
✓ Home equity is not cash — it is locked in the property and cannot be accessed without refinancing, selling, or taking out a specific equity release product. It cannot be used for emergencies or short-term needs without significant cost and process. Many homeowners feel wealthy because of high equity but face cash flow problems because the equity is illiquid. Maintain a separate liquid emergency fund regardless of equity level.
✗ Assuming equity grows at the same rate as property prices
✓ Equity percentage grows faster than property prices when leverage is involved. A property bought at 90% LTV with a 10% deposit (30.000 on a 300.000 property) that rises 10% to 330.000 gains 30.000 in value — doubling the equity from 30.000 to 60.000. This leveraged amplification works in both directions — a 10% fall on the same property reduces equity from 30.000 to zero and creates negative equity. Leverage amplifies both gains and losses.
✗ Not accounting for costs of accessing equity
✓ Equity release through refinancing involves valuation fees, legal costs, arrangement fees, and potentially an early repayment charge on the existing mortgage. On a 200.000 equity release at 3% refinancing costs, the costs are 6.000 before the higher balance starts accruing interest. These costs must be weighed against the benefit of accessing the equity, particularly if the purpose is consumption rather than investment.
Methodology
Equity calculated as property value minus outstanding mortgage balance. Balance trajectory calculated using the standard amortization formula. Price appreciation examples use simple annual compounding at stated rate. LTV calculated as balance divided by property value. Negative equity defined as balance exceeding property value.
Property values for equity calculation should use current market value, not purchase price or assessed value. For accurate equity calculation, a recent professional valuation or comparable sales data is more reliable than the original purchase price.
Does equity build faster with extra mortgage payments?
Yes. Every extra payment above the required minimum goes entirely to principal reduction, directly increasing equity. On a 200.000 mortgage at 3,5% over 25 years, paying an additional 200 per month reduces the term by approximately 6 years and saves approximately 18.000 in interest. Each extra payment builds equity faster and reduces the total interest cost — it is one of the highest-guaranteed-return actions available to a homeowner with a mortgage.
Can equity be used as a deposit for another property?
Yes — through equity release or by selling the existing property. If you sell and downsize, the equity becomes cash that can fund a deposit on a new purchase. If you want to keep the existing property, you can refinance to release equity — taking a larger mortgage on the existing property up to the lender's maximum LTV — and use the released cash as a deposit on a second property. This strategy is common in buy-to-let property investment but increases total borrowing and risk.
Is home equity subject to tax in the Netherlands?
The primary residence in the Netherlands is taxed under Box 1 through the eigenwoningforfait — a notional rental value added to Box 1 income, offset by mortgage interest deduction (hypotheekrenteaftrek). This is not a direct tax on equity. When the property is sold, any capital gain on the primary residence is not subject to capital gains tax in the Netherlands — the gain is tax-free. For second properties or investment properties, the value falls in Box 3 and is taxed under the wealth tax system.