SDLT Price Band Optimizer
See how small price changes affect your stamp duty bill. Find sweet spots near band thresholds and avoid costly cliff edges — especially the FTB £500,000 boundary.
Rates verified: March 2026 (post-April 2025 rates)
Key Takeaways
- •SDLT is a marginal system — only the slice above each threshold is taxed at the higher rate.
- •The FTB £500,000 boundary is a true cliff edge: crossing it triggers full standard rates, costing ~£2,500 more for just £1 extra price.
- •Sweet spots just below thresholds offer real negotiation targets — especially at £250k, £300k (FTB) and £925k.
- •Green rows in the table are sweet spots; red rows are where you have just crossed a threshold.
In this article
How to Use This Tool
- 1Enter the property price you are considering.
- 2Select your buyer type (FTB, standard, or additional property).
- 3Set your flexibility range — how much the price could realistically change.
- 4Review the threshold analysis: nearest thresholds below and above.
- 5Scan the optimal price table for green sweet spots.
- 6Use the marginal rate figure to understand the cost of each extra £1,000.
Price Band Optimizer
| Price | SDLT | Effective Rate |
|---|---|---|
| £275,000 | £3,750 | 1.4% |
| £280,000 | £4,000 | 1.4% |
| £285,000 | £4,250 | 1.5% |
| £290,000 | £4,500 | 1.6% |
| £295,000 | £4,750 | 1.6% |
| £300,000← your price | £5,000 | 1.7% |
| £305,000 | £5,250 | 1.7% |
| £310,000 | £5,500 | 1.8% |
| £315,000 | £5,750 | 1.8% |
| £320,000 | £6,000 | 1.9% |
| £325,000 | £6,250 | 1.9% |
Understanding Your Results
Green rows (sweet spots) are prices just below a threshold. At these prices, SDLT is significantly lower than a few thousand pounds higher — ideal negotiation targets.
Red rows (just crossed) are prices where you have just moved into a higher rate band. The SDLT jumps here are disproportionate — try to negotiate below the threshold.
Blue row is your current entered price. The "vs your price" column shows savings (green) or extra cost (red) at each alternative price.
The marginal rate (cost per extra £1,000) tells you exactly how much SDLT each additional £1,000 of price costs at your current position in the band. This is the rate to use when negotiating.
SDLT Thresholds Explained
SDLT uses a marginal (slice) system — similar to income tax. Each threshold marks where a higher rate starts, but that rate only applies to the portion of price above the threshold, not the entire price.
| Price Band | Standard Rate | FTB Rate | Additional Rate |
|---|---|---|---|
| Up to £125,000 | 0% | 0% | 5% |
| £125,001 – £250,000 | 2% | 0%* | 7% |
| £250,001 – £300,000 | 5% | 0%* | 10% |
| £300,001 – £500,000 | 5% | 5% | 10% |
| £500,001 – £925,000 | 5% | 5%** | 10% |
| £925,001 – £1,500,000 | 10% | 10% | 15% |
| Over £1,500,000 | 12% | 12% | 17% |
* FTB relief applies on properties up to £500,000. ** At £500,001+, FTB relief is lost and standard rates apply in full.
Important: Before April 2025, the standard nil-rate threshold was £250,000. Since April 2025, it returned to £125,000 (the current permanent rate). FTB nil-rate threshold returned to £300,000 (from the temporary £425,000).
The £500,000 FTB Cliff Edge
This is the most important threshold in SDLT for first-time buyers. Crossing £500,000 completely removes FTB relief and triggers full standard rates on the entire purchase.
Unlike standard thresholds where only the sliver above the line is taxed at the higher rate, the FTB £500,000 limit works differently: if the property costs more than £500,000,all FTB relief is withdrawn and standard rates apply to the whole price. This makes it a true cliff edge, not a marginal step.
Worked Examples
Example 1: Standard Buyer at £260,000
SDLT = £3,000 (£125k at 0% + £125k at 2% + £10k at 5% = £0 + £2,500 + £500 = £3,000). At £250,000: SDLT = £2,500. The extra £10k of price costs £500 more SDLT (5% on £10k). The marginal rate in this band is £5 per extra £1,000 — worth knowing when negotiating.
Example 2: FTB at £310,000
SDLT = £500 (first £300k at 0%, then £10k at 5% = £500). At £300,000: SDLT = £0. Negotiating just £10k off the price eliminates £500 of SDLT entirely.
Example 3: FTB at £510,000 — Cliff Edge
SDLT = £15,500 (standard rates, FTB relief lost). At £499,999: SDLT = £10,000 (FTB rates). Saving = £5,500 by dropping the price by £10,001. This is by far the most impactful negotiation in SDLT for FTBs.
Frequently Asked Questions
Is it worth negotiating a lower price to cross a stamp duty threshold?
Yes, especially near the FTB £500,000 cliff edge where £1 can cost £2,500+ in extra SDLT. At other thresholds, the savings are smaller but still meaningful — dropping from £260k to £250k saves £500 in SDLT.
How does the marginal rate system work?
SDLT uses a marginal (or "slice") system like income tax. Only the portion of the price within each band is taxed at that band's rate. Buying at £250,001 means £1 is taxed at 5%, not the whole price — very different from the old pre-2014 slab system.
What is the most important threshold to avoid crossing?
For first-time buyers: £500,000 (complete loss of FTB relief, costs ~£2,500 in extra SDLT). For standard buyers: £250,000 (rate jumps from 2% to 5%). For additional property buyers: all thresholds matter equally since the 5% surcharge applies on top.
Can I agree a lower price with the seller to reduce stamp duty?
Yes, SDLT is based on the price actually paid. Legitimate price negotiation is the most straightforward way to reduce SDLT. However, artificially deflating the price while paying the difference separately (e.g., for fixtures) may be treated as SDLT avoidance and is potentially fraudulent.
Does the price band optimizer work for Scotland and Wales?
This tool uses England/NI SDLT rates only. Scotland (LBTT) and Wales (LTT) have different band thresholds and structures. Use the Scotland LBTT calculator or Wales LTT calculator on this site for those regions.
Emma Richardson, MRICS
Chartered Surveyor & Property Tax Specialist
Emma Richardson is a RICS-qualified Chartered Surveyor with over 12 years of experience in UK property taxation. She founded Stamp Duty Calculator to help buyers understand the complex world of property transaction taxes.