Combined APR and BPR Inheritance Tax Cap Calculator

What This Calculator Does and Why It Matters

The Combined APR and BPR Inheritance Tax Cap Calculator helps UK estate owners, farmers, and business proprietors estimate their inheritance tax (IHT) liability under rules that cap the combined value of Agricultural Property Relief (APR) and Business Property Relief (BPR) at £1 million per person. This cap was announced in the UK Autumn Budget 2024 and represents one of the most significant changes to agricultural and business estate planning in decades.

Before this change, qualifying agricultural and business assets could attract 100% relief with no upper limit. Under the new rules, relief above the £1 million combined threshold is taxed at an effective rate of 20% rather than the standard 40% IHT rate. This calculator helps you model the impact and plan accordingly.

For related UK tax planning calculations, our EOT Capital Gains Tax 50% Relief Calculator and Combined APR and BPR Inheritance Tax Cap Calculator are useful companion tools.

How to Use This Calculator

Step-by-Step Instructions

1. Enter the total value of the estate in pounds.
2. Enter the Nil-Rate Band (NRB) being used — this is £325,000 for a single person in 2025/26.
3. Enter the Residence Nil-Rate Band (RNRB) if applicable — this is up to £175,000 where the main residence passes to direct descendants.
4. Enter the value of all APR-qualifying assets (farmland, farm buildings, farmhouses in active use) and the applicable APR rate — 100% for owner-occupied and 50% for let agricultural property in some cases.
5. Enter the value of all BPR-qualifying assets (trading business interests, AIM shares, machinery owned by the business) and the applicable BPR rate.
6. Confirm the combined APR + BPR cap — currently £1,000,000 per individual under the proposed rules.
7. Confirm the standard IHT rate — 40% in most cases.
8. Click Calculate to see total relief applied, taxable estate, IHT due, and a detailed step-by-step breakdown.

The Formula Explained

Breaking Down the Formula

The calculator first determines the total value of APR and BPR relief before the cap. It then applies the £1 million cap to this combined relief. Any relief that would have applied above the cap is instead subject to IHT at a reduced rate of 20% (half of the standard 40%). The remaining estate after deducting the NRB, RNRB, and capped relief is taxed at the full 40% rate.

So the total IHT is the sum of two amounts: the standard 40% on taxable estate above all reliefs and bands, plus a 20% charge on the portion of APR/BPR that exceeds the £1 million cap. This is what makes planning around the cap so important — assets above the threshold still attract IHT, just at a lower rate.

Example Calculation with Real Numbers

A farmer’s estate is worth £3,500,000. The nil-rate band is £325,000 and RNRB is £175,000. The farm has £1,800,000 of APR-qualifying assets at 100% relief and £400,000 of BPR-qualifying business interests at 100%. Combined APR + BPR relief before the cap is £2,200,000. After applying the £1m cap, only £1,000,000 of relief is fully applied. The remaining £1,200,000 of relief above the cap is taxed at 20%, which is £240,000. The taxable estate after all deductions is £3,500,000 minus £325,000 minus £175,000 minus £1,000,000 = £2,000,000, taxed at 40% = £800,000. Total IHT = £800,000 + £240,000 = £1,040,000.

When Would You Use This

Real Life Use Cases

This calculator is most useful for farmers, landowners, and family business owners who hold assets that qualify for APR and BPR. It is also relevant for solicitors, accountants, and estate planners advising clients on the new rules. Any estate where agricultural or business assets exceed £1 million is directly impacted and should be modelled before planning decisions are made.

Specific Example Scenario

A couple who own a mixed farm together may each have a £1 million cap — meaning up to £2 million of combined APR and BPR relief may be available between them through careful estate planning. This calculator helps them model what happens if the farm is split between spouses versus held in one name, and how the IHT liability changes in each scenario. That kind of analysis could inform decisions about ownership restructuring, gifting strategies, or life insurance to cover the liability. You may also want to explore our Whole Life Insurance Cash Value Calculator to model coverage options for IHT planning.

Tips for Getting Accurate Results

Understand Which Assets Qualify for APR and BPR

Not all farm or business assets qualify automatically. APR applies to agricultural property used for agriculture — including farmland, farm buildings, and in some cases farmhouses — but only where the property meets the occupation and ownership conditions. BPR applies to interests in trading businesses, certain company shares including AIM-listed companies, and some assets used by a business. Investment businesses, furnished holiday lets, and pure investment portfolios generally do not qualify. The UK Government’s APR guidance is the authoritative source on qualifying conditions.

Factor in Transferable Allowances Between Spouses

Transfers between UK-domiciled spouses are exempt from IHT. This means any unused NRB and RNRB from a deceased spouse can be transferred to the surviving spouse, potentially doubling the tax-free threshold. Under the proposed APR and BPR cap rules, each individual has their own £1 million combined cap, so careful ownership structure between spouses could significantly reduce the overall estate IHT bill.

Model Gifting and Phased Transfer Strategies

One strategy to reduce exposure above the cap is to make lifetime gifts of business or agricultural assets. Gifts may become potentially exempt transfers (PETs) or chargeable lifetime transfers (CLTs) and fall out of the estate after 7 years. However, clawback rules apply if the donor does not survive 7 years. Modelling different scenarios in this calculator alongside professional advice is essential. Our Property Income Tax Band Calculator can also help you assess income tax implications of restructuring property ownership during lifetime transfers.

Frequently Asked Questions

What is the combined APR and BPR cap?

The combined APR and BPR cap is a limit of £1 million per person on the total value of agricultural and business assets that can attract full 100% inheritance tax relief. It was announced in the UK Autumn Budget 2024 and is proposed to take effect from April 2026. Above this cap, qualifying assets are still partially relieved — taxed at 20% rather than the full 40% IHT rate.

What is the difference between APR and BPR?

Agricultural Property Relief (APR) applies specifically to agricultural land and property in active farming use. Business Property Relief (BPR) applies to interests in trading businesses, including family company shares and sole trader businesses. Some farm assets may qualify for both, in which case APR takes priority. Under the new rules, the combined relief from both is subject to the same shared £1 million cap.

Does the cap apply to each spouse separately?

Yes. Under the proposed rules, each individual has their own £1 million combined APR and BPR cap. This means a married couple who each hold qualifying assets independently could potentially benefit from up to £2 million of combined relief. Careful ownership structure between spouses is a key planning consideration.

What happens to relief above the £1 million cap?

Assets that would have attracted 100% APR or BPR above the cap will instead be taxed at 20% — half the standard 40% IHT rate. Assets that attract 50% relief (such as some let agricultural property) will be taxed at the full 40% above the cap. This creates a two-tier tax outcome depending on which type of qualifying property exceeds the threshold.

Are AIM shares affected by the APR/BPR cap?

Yes. AIM shares that qualify for BPR will count toward the £1 million combined cap. This has significant implications for investors who hold large portfolios of BPR-qualifying AIM shares as part of their IHT planning strategy. The tax advantage of AIM portfolios above £1 million will be reduced compared to the pre-2026 rules.

Can I use both my NRB and RNRB alongside the APR/BPR relief?

Yes. The NRB (£325,000) and RNRB (up to £175,000) are separate from the APR/BPR cap and can be used in addition to it. A single individual could therefore pass up to £1.5 million of estate free from IHT using the full NRB, RNRB, and APR/BPR cap combined — before any other planning strategies.

Does this calculator account for taper relief on gifts?

This calculator focuses on the estate value at death and the application of APR, BPR, NRB, and RNRB. It does not model taper relief on lifetime gifts made within 7 years of death, which reduces the IHT rate on those gifts on a sliding scale. A full estate plan should account for any potentially exempt transfers made within the 7-year period. According to HMRC guidance on IHT and gifts, taper relief starts at 20% reduction after 3 years and reaches 80% reduction between 6 and 7 years.

Should I restructure my business or farm before April 2026?

This is a complex question that depends on your specific circumstances, the structure of your assets, your age and health, and your family situation. The new rules create genuine planning opportunities — such as transferring assets between spouses, gifting earlier, or using trusts — but also carry risks. You should seek advice from a qualified UK tax adviser or solicitor who specialises in agricultural and business property before making any structural changes.

Conclusion

The Combined APR and BPR Inheritance Tax Cap Calculator gives farm owners, business proprietors, and their advisers a clear way to model the impact of the proposed new rules and estimate the IHT liability under the £1 million combined relief cap.

With changes of this scale affecting some of the most asset-rich estates in the UK, early and informed planning is essential. Use this calculator to understand your exposure, then work with a qualified professional to explore your options before the rules take effect.