A tracker mortgage ties your interest rate directly to the Bank of England base rate, offering transparency and the potential for savings — but also exposing you to the risk of rising rates. This guide explains how trackers work, what to look for, and whether one makes sense for your circumstances.
How a Tracker Mortgage Works
Your interest rate is the Bank of England base rate plus a fixed margin set by your lender. This margin stays the same for the duration of the deal.
Example:
| Component | Rate |
|---|---|
| Bank of England base rate | 4.50% |
| Lender’s margin | + 0.75% |
| Your mortgage rate | 5.25% |
If the Bank of England raises the base rate by 0.25%, your rate automatically becomes 5.50%. If the base rate drops by 0.25%, your rate falls to 5.00%. Changes typically take effect from the following month.
Types of Tracker Mortgage
Term Tracker
The most common type. Your rate tracks the base rate for a set period — usually two, three, or five years. After this period, you move onto the lender’s SVR and should remortgage to a new deal.
Lifetime Tracker
Your rate tracks the base rate for the entire mortgage term — potentially 25 or 30 years. These often come with no early repayment charges, giving you the flexibility to remortgage at any time.
Discounted Tracker
A few deals offer a discounted tracker rate for an introductory period — for example, base rate + 0.5% for two years, then base rate + 1.0% for the remainder. These can be attractive if the introductory margin is competitive.
Current Tracker Mortgage Rates
Tracker mortgage rates depend on the current base rate and the margin your lender charges. Here is a snapshot of how margins typically vary by loan-to-value ratio:
| LTV | Typical Margin Above Base Rate | Effective Rate (base rate at 4.5%) |
|---|---|---|
| 60% | +0.50% to +0.75% | 5.00–5.25% |
| 75% | +0.75% to +1.00% | 5.25–5.50% |
| 85% | +1.00% to +1.50% | 5.50–6.00% |
| 90% | +1.25% to +1.75% | 5.75–6.25% |
Lower LTV ratios attract smaller margins because the lender has more equity as security. Use our mortgage calculator to see what different rates mean for your monthly payments.
Tracker vs Fixed Rate
This is the fundamental decision for most borrowers:
| Feature | Tracker | Fixed |
|---|---|---|
| Rate certainty | No — moves with base rate | Yes — locked for fixed period |
| Benefits from rate cuts | Yes — automatically | No |
| Exposed to rate rises | Yes | No |
| Transparency | High — linked to public rate | High — set at outset |
| Typical starting rate | Sometimes lower | Sometimes higher |
| Early repayment charges | Sometimes none | Usually apply |
When a Tracker Makes More Sense
- You believe rates will fall — if the base rate drops, your payments drop automatically
- You want flexibility — lifetime trackers with no ERCs allow you to leave at any time
- You can absorb risk — you have enough financial headroom to handle payment increases
When a Fixed Rate Makes More Sense
- You need payment certainty — especially if you’re on a tight budget
- You think rates might rise — a fix protects you from increases
- You’re a first-time buyer — the certainty of a fixed payment helps you adjust to mortgage costs
Key Things to Check Before Choosing a Tracker
The Collar (Floor Rate)
Most trackers include a floor — a minimum rate below which your interest rate cannot fall. Even if the base rate dropped to 0%, your rate would not go below this floor. Check whether your deal has one and what it is.
The Cap (Ceiling Rate)
A few tracker deals include a cap — a maximum rate above which your interest rate cannot rise. Capped trackers offer some protection against extreme rate rises but are rare and usually carry a wider margin to compensate.
Early Repayment Charges
Term trackers (two-year, five-year) may have ERCs during the deal period. Lifetime trackers usually don’t. If flexibility to remortgage is important to you, prioritise deals with no ERCs.
Follow-On Rate
When a term tracker ends, you’ll move onto your lender’s SVR — which is likely to be significantly higher. Set a reminder to start looking for a new deal three to six months before your tracker period expires.
The Base Rate and Your Payments
Here is how different base rate scenarios would affect monthly payments on a £200,000 repayment mortgage over 25 years at base rate + 0.75%:
| Base Rate | Your Rate | Monthly Payment | Difference vs 4.5% Base |
|---|---|---|---|
| 3.50% | 4.25% | £1,084 | -£68/month |
| 4.00% | 4.75% | £1,139 | -£13/month |
| 4.50% | 5.25% | £1,197 | — |
| 5.00% | 5.75% | £1,256 | +£59/month |
| 5.50% | 6.25% | £1,316 | +£119/month |
| 6.00% | 6.75% | £1,379 | +£182/month |
A 1.5% rise in the base rate would add roughly £182 per month — over £2,180 per year. Make sure you can afford this kind of increase before choosing a tracker.
Stress-Testing Your Affordability
Before taking a tracker mortgage, calculate whether you could still afford your payments if the base rate rose by 2–3 percentage points. If a rise of that magnitude would put you in financial difficulty, a fixed rate mortgage is almost certainly the safer choice.
Your lender is required to stress-test your affordability as part of the mortgage application, but doing your own calculation ensures you’re comfortable rather than just qualifying on paper.
How to Get the Best Tracker Deal
- Compare your loan-to-value — the more equity you have, the lower the margin you’ll be offered
- Factor in fees — a lower margin with a £1,500 product fee may cost more overall than a slightly higher margin with no fee
- Check for ERCs — no-ERC deals give you maximum flexibility
- Use a mortgage broker — brokers can access deals not available directly and will know which lenders offer the most competitive trackers for your profile
- Consider the mortgage affordability calculator to check what you can borrow at different rate levels