What Is a HELOC?
A Home Equity Line of Credit (HELOC) is a revolving line of credit secured against your home equity. Popular in the United States, it works like a credit card backed by your property. You can borrow up to a set limit, repay, and borrow again. Interest is charged only on the amount drawn and is typically calculated on the daily average balance.
HELOCs are the foundation of the velocity banking strategy in the US. Borrowers take a large draw from their HELOC, pay it as a lump sum against their mortgage, then redirect their monthly income to pay down the HELOC rapidly. This cycle is repeated to progressively reduce the mortgage.
Why HELOCs Do Not Exist in the UK
The UK mortgage market is structured differently from the US market. UK regulators and lenders have not adopted the HELOC model. Instead, the UK market offers several alternative products that can serve similar purposes:
UK Alternatives Compared
1. Offset Mortgage
The closest UK equivalent to using a HELOC for velocity banking. An offset mortgage links one or more savings accounts to your mortgage. The savings balance is deducted from the mortgage balance for interest calculation purposes.
Advantages
- Savings remain accessible (not locked in like overpayments)
- Interest saving is tax-free (equivalent to earning your mortgage rate on savings)
- Ideal for higher-rate taxpayers who would pay tax on savings interest
- Can link multiple savings accounts (some family offset products exist)
- Effectively acts like a HELOC without the borrowing risk
Disadvantages
- Interest rates typically 0.2-0.5% higher than standard fixed rates
- Fewer lenders offer offset products (limited choice)
- No interest earned on linked savings (opportunity cost if mortgage rate is low)
- Requires discipline to not spend accessible savings
Best for: Higher earners with significant savings who want flexibility. Particularly effective for higher-rate taxpayers. Read our detailed offset mortgage guide.
2. Flexible Mortgage
Flexible mortgages allow overpayments, underpayments, and sometimes borrowing back (drawdown) of previous overpayments. They provide more freedom than standard mortgages but less than an offset.
Advantages
- Overpay without penalty limits
- Some allow drawdown of overpayments
- Payment holidays possible after building up reserves
Disadvantages
- Higher interest rates than standard products
- Fewer available products in the market
- Drawdown facilities vary significantly between lenders
Best for: Self-employed borrowers or those with irregular income who need payment flexibility.
3. Regular Overpayments
The simplest approach. Most UK mortgages allow overpayments of up to 10% of the balance per year without penalty.
Advantages
- Available on almost all mortgage products
- No need to switch mortgage type
- Straightforward to set up
- Can benefit from the lowest available fixed rates
Disadvantages
- Limited to 10% per year on most fixed deals
- Overpayments usually cannot be withdrawn
- Penalty charges if you exceed the limit
Best for: Most UK homeowners, especially those on competitive fixed-rate deals who want simplicity.
4. Further Advance / Second Charge Mortgage
Borrowing additional money against your home equity through your existing lender (further advance) or a new lender (second charge). This is the most HELOC-like product in the UK but functions as a separate loan rather than a revolving credit line.
Advantages
- Access to home equity without remortgaging
- Can be used for large investments or debt consolidation
Disadvantages
- Not revolving (one-time drawdown)
- Separate interest rate (often higher)
- Application and valuation fees
- Increases total debt secured against your home
Best for: One-off large purchases or investments. Not ideal for velocity banking due to non-revolving nature.
Head-to-Head Comparison
| Feature | US HELOC | UK Offset | UK Flexible | UK Overpayments |
|---|
| Revolving credit | Yes | Effectively yes | Sometimes | No |
| Access to funds | Anytime | Savings accessible | Drawdown possible | Locked in |
| Interest calculation | Daily balance | Net balance | Varies | Monthly balance |
| Rate premium | Variable rate | +0.2-0.5% | +0.3-0.6% | None |
| Velocity banking suitability | Excellent | Good | Moderate | Basic |
| Availability | Widespread (US) | Limited (UK) | Rare (UK) | Universal (UK) |
Which Should You Choose?
For most UK homeowners, the decision comes down to your financial situation and goals:
- If you have significant savings — An offset mortgage lets you reduce interest while keeping savings accessible. This is the most effective UK velocity banking approach.
- If you have irregular income — A flexible mortgage provides the most payment freedom.
- If you want the lowest rate — Stick with a competitive fixed rate and make regular overpayments within the 10% limit.
- If you are a higher-rate taxpayer — Offset mortgages are particularly tax-efficient since the interest saving is not taxable, unlike savings account interest above your Personal Savings Allowance.
Try our velocity banking calculator or overpayment calculator to see the potential savings for your situation.
Frequently Asked Questions
No. HELOCs as they exist in the US are not available in the UK. The closest alternatives are offset mortgages and flexible mortgages. Further advances and second charge mortgages provide lump-sum access to equity but are not revolving credit lines.
An offset mortgage links your savings to your mortgage. Your savings balance reduces the mortgage balance for interest purposes. With a £250,000 mortgage and £40,000 in savings, you pay interest only on £210,000. Your savings remain accessible but earn no interest.
Offset mortgages offer more flexibility because your savings remain accessible. With overpayments, the money is typically locked in. However, offset rates are slightly higher. The best choice depends on whether you value flexibility or the lowest rate.
Yes, using offset mortgages, regular overpayments, or flexible mortgages. The core principle of reducing your average balance and redirecting income still applies. Read our
complete UK guide for the adapted strategy.
Further Reading