Advanced Taxation (UK) · Mitigation of tax by numerical analysis and reasoned argument

Stamp Taxes and VAT Planning Considerations for ATX-UK

Updated 11 October 2026 · Fact-checked

This topic asks you to show how SDLT, stamp duty and VAT change the cost of a planning choice. Use the tax tables: non-residential SDLT is sliced at 0%, 2% and 5%, share stamp duty is 0.5%, and VAT has registration and deregistration limits plus late payment penalties. Compute the cost, compare options, then advise.

Understand Stamp Taxes and VAT Planning Considerations

Stamp taxes and VAT rarely stand alone in ATX. They appear as a cost or cash flow effect inside a bigger decision, such as buying a business property, buying shares in a target company, or a trader whose sales are near the VAT limit. Your job is to quantify the effect and say what it means for the client.

SDLT on non-residential property is charged by slices, like income tax. In the tables the rates are 0% up to £150,000, 2% on the slice from £150,001 to £250,000, and 5% on the excess over £250,000. It is paid by the buyer. A higher price therefore costs 5% extra SDLT on each extra pound above £250,000, so a price negotiation or a split of the price can matter.

Stamp duty on shares is 0.5% of the consideration, paid by the buyer. The tables list it as a flat rate. Remember it applies to share purchases, so it is a cost of buying shares, not selling them. In practice the amount is rounded up to the nearest £5, but only apply that if the question tells you or the tables show it. The tables you are given show only the 0.5% rate, so use the figure the question provides.

VAT planning centres on three limits. A trader must register when taxable turnover exceeds the registration limit of £90,000, and may apply to deregister if turnover falls below the deregistration limit of £88,000. Registration means charging 20% output VAT, which hurts customers who cannot recover VAT, and gives you input tax recovery. Deregistration saves admin and output VAT but loses input tax recovery.

Late payment penalties for VAT depend on days late. Up to 15 days there is no penalty. At 16 to 30 days it is 3%. Beyond 30 days it is 6% plus a daily penalty at an annual rate of 10%. These penalties make timing of payment a planning point. Always link numbers to advice: what the client saves, what it costs, and what else to consider.

Key rules to remember

SDLT non-residential property: 0% × first £150,000 + 2% × (£150,001 to £250,000) + 5% × excess over £250,000; Sliced rates. Maximum tax on the 2% band is £2,000 (£100,000 × 2%).
Stamp duty on shares: 0.5% × consideration; Paid by the buyer of shares. Use the rate given in the tables.
VAT registration and deregistration limits: Register above £90,000; deregistration below £88,000 (taxable turnover); Standard rate of VAT is 20%.
VAT late payment penalty: Up to 15 days: nil; 16 to 30 days: 3%; over 30 days: 6% plus daily penalty at 10% a year; Check days late carefully before choosing the band.
Net-of-VAT price: VAT-inclusive price × 100 ÷ 120; Use when a trader who registers must absorb VAT in an existing price.

How to solve Stamp Taxes and VAT Planning Considerations questions

Use this method for any planning question involving SDLT, stamp duty or VAT.

1Identify which tax applies: SDLT for non-residential land, stamp duty for share purchases, VAT for supplies and registration.
2Identify who pays. SDLT and stamp duty fall on the buyer.
3Calculate the tax for each option, showing slices or the rate applied.
4Compute the difference between the options and state it in £.
5Consider timing and cash flow, including VAT penalties for late payment.
6Bring in non-tax factors from the scenario, such as commercial reasons, customers who cannot recover VAT, or the client's wishes.
7Conclude with a clear recommendation tied to the client's objective, noting any risks.

Quickest way: Slice, compare, recommend

When to use it: Use when time is short and the question asks for the tax cost of two or more options.

Write the SDLT slices as a one-line formula before calculating.
Use £2,000 as the full 2% band, then add 5% of the excess over £250,000.
Calculate share stamp duty as 0.5% of the price.
For VAT, compare turnover to £90,000 and £88,000 first.
Write the saving or cost for each option and finish with one sentence of advice.

Common mistakes in Stamp Taxes and VAT Planning Considerations

Applying one SDLT rate to the whole price.
Students confuse SDLT with a flat tax.
Fix: Slice the price into 0%, 2% and 5% parts and add them.
Charging stamp duty to the seller of shares.
Students link all transfer taxes to the person disposing of the asset.
Fix: State that the buyer pays, and include it in the buyer's cost.
Mixing up the registration limit of £90,000 and the deregistration limit of £88,000.
The numbers are close and both are in the tables.
Fix: Write both limits and label them before you compare turnover.
Using the wrong VAT penalty band, for example treating 16 days late as nil.
Students misread the 'up to 15 days' band.
Fix: Count days late first, then match to the table.
Giving figures with no advice or commercial comment.
Students stop once the calculation is done.
Fix: Add a recommendation and a non-tax factor, as professional skills marks reward this.

Worked examples

Example 1

A company plans to buy a non-residential building for £400,000. Calculate the SDLT payable. It could instead negotiate a price of £250,000 for the building and pay £150,000 for separately identified fixtures. Assuming SDLT applies only to the £250,000, calculate the SDLT and the saving.

Show the solution

Option 1, £400,000: the first £150,000 is at 0%, giving £0.
The slice £150,001 to £250,000 is £100,000 × 2% = £2,000.
The excess is £400,000 − £250,000 = £150,000 × 5% = £7,500.
Total SDLT is £2,000 + £7,500 = £9,500.
Option 2, £250,000: £0 + £2,000 = £2,000.
Saving is £9,500 − £2,000 = £7,500.
Comment: any allocation must be commercially justifiable and supported by a reasonable valuation. An artificial split risks challenge from HMRC.

Answer: SDLT on £400,000 is £9,500. On the £250,000 option it is £2,000, a saving of £7,500, provided the allocation is genuine and defensible.

Example 2

A sole trader's taxable turnover has reached £92,000 for the 12 months to date and customers are mostly private individuals. Explain the VAT effect and calculate the penalty if a VAT payment of £10,000 is paid 20 days late and then if paid 40 days late (ignore the daily penalty).

Show the solution

Turnover of £92,000 exceeds the registration limit of £90,000, so the trader must register and charge VAT at 20%.
Private customers cannot recover VAT, so either prices rise or margins fall. A price of £120 including VAT gives net revenue of £120 × 100 ÷ 120 = £100.
Registration allows the trader to recover input VAT on business costs.
Payment 20 days late falls in the 16 to 30 days band: 3% × £10,000 = £300.
Payment 40 days late falls in the over 30 days band: 6% × £10,000 = £600, plus a daily penalty at an annual rate of 10% for the period concerned.
Advice: register on time and pay by the due date. Cash flow planning avoids penalties.

Answer: The trader must register because £92,000 exceeds £90,000. A 20-day delay costs £300. A 40-day delay costs £600 plus a daily penalty at 10% a year.

Exam tips

Show every SDLT slice separately so you pick up method marks even if arithmetic slips.
Check who bears each tax: SDLT and stamp duty fall on the buyer.
In VAT planning questions, always compare turnover with both limits and state the consequence for customers and costs.
End every planning answer with a recommendation and a non-tax factor to earn professional skills marks.
Take rates from the tax tables in the exam. Do not rely on memory for any figure.

Practice questions from Mitigation of tax by numerical analysis and reasoned argument

Stamp Taxes and VAT Planning Considerations: frequently asked questions

What are the SDLT rates for non-residential property in ATX-UK?

The tables give 0% up to £150,000, 2% on the slice from £150,001 to £250,000 and 5% on the excess over £250,000. The rates apply to slices of the price, not the whole price.

What is the rate of stamp duty on shares in ATX-UK?

The rate is 0.5% of the consideration. It is a cost to the buyer of the shares.

What are the VAT registration and deregistration limits?

The registration limit is £90,000 and the deregistration limit is £88,000. The standard rate of VAT is 20%.

How do VAT late payment penalties work?

There is no penalty for payments up to 15 days late. At 16 to 30 days the penalty is 3%. After 30 days it is 6% plus a daily penalty at an annual rate of 10%.