IHT Liability Deductions UK 2026: What Debts Reduce Your Inheritance Tax Estate, and What HMRC Disallows
Genuine debts — mortgages, credit cards, tax arrears, funeral costs — reduce the IHT estate. But Finance Act 2013 anti-avoidance rules (s162B/C IHTA) stop double-dipping with BPR assets and excluded property.
| Liability Type | Deductible? | HMRC Position | Anti-Avoidance Risk |
|---|---|---|---|
| Mortgage on residential property (repayment or interest-only) | YES — fully deductible (s162 IHTA) | Deductible without restriction as a genuine commercial liability for money's worth. Reduces the estate value by the outstanding balance at date of death. Also reduces the RNRB qualifying residential interest (s8H(4) IHTA) — see RNRB interaction. | If the mortgage was used to fund BPR-qualifying or excluded property acquisitions (post-April 2013): s162B/C IHTA may redirect the deduction — debt deducted from BPR/excluded property first, not general estate. HMRC scrutinises connected-party mortgages. |
| Credit card balances outstanding at date of death | YES — fully deductible | A genuine enforceable debt for money's worth. Outstanding balance at date of death (as shown on the final statement) is deductible. Interest accruing AFTER death is NOT deductible (that is a post-death liability). | No specific anti-avoidance provision for standard credit card debts. HMRC will check that the debts are genuine (not invented). Executor should keep statements and evidence of all debts. |
| Personal loans and bank overdrafts | YES — fully deductible | Enforceable commercial debts. Outstanding principal balance at date of death. Include all bank loans, finance agreements, hire-purchase outstanding balances. | No specific anti-avoidance if the loans were for genuine purposes. If the loan was used to fund BPR/APR/excluded property: s162C/s162B IHTA redirect the deduction. |
| Income tax, CGT, and VAT arrears at date of death | YES — fully deductible | Tax debts owed at the date of death are allowable liabilities. Includes any income tax outstanding on the final personal tax return; CGT due on disposals in the final tax year; VAT owed by a self-employed individual. The executor must identify all tax liabilities. | The Self Assessment tax return for the year of death must still be filed and any tax paid by the estate. Tax penalties and interest accruing AFTER death are debatable; the original tax debt (assessed before death) is deductible. |
| Funeral expenses | YES — reasonable amounts (s172 IHTA) | s172 IHTA: reasonable funeral expenses are deductible. Includes: coffin; ceremony and burial/cremation; flowers (reasonable amount); headstone/grave marker; funeral director's fee; wake — limited to REASONABLE amount. HMRC IHTM28001: 'reasonable' depends on the circumstances of the estate; for a large estate, a more expensive funeral may be reasonable. | HMRC can challenge excessive claims — a very extravagant wake or events going beyond a funeral are not deductible. Keep all receipts. Donation to a charity at the funeral: deductible as a funeral expense if customary and reasonable. |
| Business debts personally owed (sole trader or partnership debts) | YES — personally owed business debts are deductible | A sole trader or partner is personally liable for business debts. These debts, owed personally at the date of death, reduce the IHT estate. Business assets (value of the business) and BPR (ss103-114 IHTA) interact: if the business qualifies for BPR, s162C IHTA requires that business liabilities are deducted from the business asset value first (not the general estate). | s162C IHTA (Finance Act 2013): a liability that is attributable to the acquisition, maintenance, or enhancement of BPR-qualifying property must be deducted from the BPR-qualifying property value BEFORE relief is calculated — not from the general estate. |
| Guarantee liability (personal guarantee called before death) | YES — if called before or at death and enforceable | If the deceased gave a personal guarantee for a third party's loan and the guarantee was called before death (the deceased owed the money at date of death): that liability is deductible. If the guarantee had NOT been called at the date of death — it is a contingent liability and may not be deductible (or may be deductible at a discounted value depending on the probability of being called — HMRC IHTM28131). | HMRC will scrutinise guarantees given to connected parties (family members, own companies). If the guarantee arrangement was designed to create an artificial estate deduction, s103 IHTA anti-avoidance may apply. |
| Debt used to fund BPR-qualifying AIM shares (post-April 2013) | RESTRICTED — s162C IHTA: deducted from BPR property first | If the deceased borrowed money specifically to acquire AIM shares (BPR-qualifying), the loan is deducted from the AIM share value before BPR is calculated — not from the general estate. This prevents: borrowing £500k to buy AIM shares, claiming 100% BPR on the shares, AND deducting the £500k from the rest of the estate (which would effectively give IHT relief on the borrowing TWICE). | s162C IHTA (Finance Act 2013): explicit anti-avoidance provision. Liability × (BPR/APR property value / (BPR/APR property + general estate value)) = restricted deduction. HMRC IHTM28031+ covers property finance arrangements. |
| Loan to fund excluded property (e.g., non-dom uses UK loan to buy foreign asset) | RESTRICTED — s162B IHTA: deducted from excluded property first | A liability used to fund the acquisition of excluded property (e.g., a non-dom borrows from a UK bank to buy a French property — the French property being excluded property) must be deducted from the excluded property first. It cannot be deducted from the UK-situs estate (which would be subject to IHT). | s162B IHTA (Finance Act 2013): prevents 'double benefit' from excluded property holding. The liability reduces the excluded property value (which is not subject to IHT anyway) — not the UK-situs taxable estate. |
| Artificial debt arrangements (loan from connected party to reduce estate) | NO — s103 IHTA anti-avoidance | A liability created by a transfer of value (e.g., a 'gift' that is dressed up as a loan) is not deductible. HMRC will also challenge arrangements where the 'lender' is a connected party (family member, trust) and the debt was created to artificially reduce the estate without genuine transfer of value for money's worth. | s103 IHTA 1984: a liability attributable to a chargeable transfer (or a PET that becomes chargeable) is not deductible. Designed to prevent arrangements where the testator 'borrows' from a connected trust/entity (thereby reducing their own estate) while the 'debt' was funded by a prior transfer from themselves. HMRC has extensive guidance (IHTM28380+) and actively scrutinises these. |
IHT liability deductions UK 2026. s5(3) IHTA 1984: IHT estate = gross assets − allowable liabilities. s162 IHTA: allowable liabilities = debts incurred for money or money's worth. s172 IHTA: funeral expenses (reasonable amounts) deductible. s103 IHTA: artificial liabilities not deductible — liability created by a disposition constituting a transfer of value not deductible to the extent the transfer was IHT-exempt or a PET. Finance Act 2013 anti-avoidance: s162A IHTA (matching principle — liability deducted from property it was used to acquire); s162B IHTA (excluded property — liability incurred to fund excluded property deducted from excluded property first, not general estate); s162C IHTA (relievable property — liability incurred to acquire/maintain/enhance BPR/APR qualifying property deducted from BPR/APR value before relief calculated). RNRB interaction: s8H(4) IHTA — qualifying residential interest (QRI) for RNRB limited to market value of property MINUS outstanding secured mortgage. RNRB = min(RNRB maximum £175k, QRI net value). IHT400 reporting: mortgage liabilities on IHT405 (land/buildings); joint property liabilities on IHT404; general liabilities on IHT400 itself. Limitation Act 1980: statute-barred debts not deductible even if morally owed. Connected-party loans: HMRC scrutiny; s103 IHTA risk if funded by prior transfer. Equity release mortgage: reduces QRI for RNRB same as standard mortgage. Foreign debts: deductible if genuine and enforceable; s162B risk for excluded property funding; convert to GBP at date of death exchange rate (s160 IHTA). BPR: ss103-114 IHTA; £1m combined BPR/APR cap from April 2026 (Finance Act 2026). APR: ss115-124 IHTA. HMRC guidance: IHTM28001+ (funeral expenses); IHTM28031+ (property finance arrangements); IHTM28380+ (artificial liabilities).
IHT Liability Deductions: Complete Guide
The basic rule — how liabilities reduce the IHT estate
The IHT estate is the net value of all property owned by the deceased at the date of death. The calculation: gross estate (all assets at market value) minus allowable liabilities equals the net estate (subject to IHT above the NRB and other thresholds). The authority for this is s5(3) IHTA 1984: the deceased's estate is to be calculated by deducting from the value of all property comprised in the estate, the amount of any liabilities to which the estate is subject. Liabilities are defined by s162 IHTA 1984: a liability is deductible if it was incurred by the deceased for a consideration in money or money's worth. In practice: genuine commercial debts (mortgages, credit cards, personal loans, tax debts) all reduce the IHT estate. A mortgage of £300k on a £700k home reduces the value of the home (and therefore the estate) by £300k. Credit card debts of £10k reduce the estate by £10k. The reduction directly reduces IHT at 40% — so a £300k mortgage saves 40% × £300k = £120k in IHT (by reducing the estate value, not the IHT calculation directly — the saving depends on where the estate sits relative to the NRB thresholds).
The Finance Act 2013 anti-avoidance rules — s162A to s162C IHTA
Finance Act 2013 introduced three new provisions to tackle avoidance schemes that exploited the liability deduction rules: s162A IHTA: a liability should generally be deducted from the property that the liability was incurred to purchase — the 'matching' principle. s162B IHTA — property finance arrangements: if a liability (e.g., a loan) was incurred to acquire excluded property (foreign-situs assets outside the UK IHT estate), the liability must be deducted from the excluded property first — it cannot be offset against the UK-situs taxable estate. This prevents a non-dom from borrowing against their UK estate to buy foreign excluded property and then deducting the loan from their UK taxable estate (giving an IHT benefit on the UK estate while the foreign property bears no UK IHT). s162C IHTA — relievable property: if a liability was incurred to acquire, maintain, or enhance property qualifying for BPR or APR, the liability must be deducted from the BPR/APR qualifying property value BEFORE relief is calculated. Example: borrowing £1m to buy AIM shares that qualify for 100% BPR. Without s162C: the £1m AIM shares are IHT-free (100% BPR) AND the £1m loan reduces the rest of the estate (saving another £400k in IHT). With s162C: the £1m loan is deducted from the AIM shares first (£1m AIM − £1m loan = £0 net BPR value); the rest of the estate is unaffected. The BPR relief is on £0. No double benefit. These provisions apply to all deaths on or after 17 July 2013.
The RNRB interaction — how a mortgage reduces the residential nil-rate band
Many executors are surprised to discover that a mortgage on the family home reduces not only the estate value but also the Residence Nil-Rate Band (RNRB) available. Under s8H(4) IHTA 1984, the value of the 'qualifying residential interest' (QRI) for RNRB purposes is reduced by any outstanding mortgage secured on that property. The RNRB is capped at the lower of the maximum RNRB (£175,000 for 2026/27) and the net value of the QRI. Example: property worth £500,000 with outstanding mortgage of £380,000. QRI net value = £500k − £380k = £120k. RNRB available = £120k (not £175k). Example 2: property worth £500,000 with mortgage of £100,000. QRI net = £400k > £175k → full RNRB = £175k. Example 3: property worth £300,000 with mortgage of £200,000. QRI net = £100k → RNRB = £100k (limited by net QRI). The practical impact: for estates where the residential property has a significant outstanding mortgage, the effective RNRB may be substantially less than the £175k headline figure. Equity release mortgages on the family home also reduce the QRI in the same way — this is an important consideration for those who have used equity release schemes. Older equity release (home reversion schemes): the IHT position is different — the homeowner has already transferred a share of the property, which reduces the estate value directly.
Foreign debts and cross-border liability rules
For UK-domiciled (or Long-Term UK Resident) individuals with foreign assets, foreign debts may be deductible from the UK IHT estate where they are genuine enforceable liabilities. The rules: (1) A foreign debt is deductible if it was incurred for money or money's worth (s162 IHTA) and is enforceable against the estate; (2) s162B IHTA: a foreign debt used to fund the acquisition of excluded property (foreign-situs assets for a non-dom) must be deducted from the excluded property, not the UK taxable estate; (3) Double tax treaty: where the UK has an IHT/estate tax treaty with the relevant foreign country, the allocation of liabilities between the UK and foreign estate may follow treaty rules; (4) Foreign secured liabilities: a mortgage on a French property reduces the value of that property in the UK IHT estate (for a UK dom); if a double tax treaty applies, France may also give credit against its own succession tax. Practical: foreign liabilities denominated in foreign currencies must be converted to GBP at the date of death exchange rate (s160 IHTA — open market value applies; for debts, this is the actual amount owed converted at the spot rate).
Practical points for executors — documenting and claiming liabilities
Executors must accurately identify and document all estate liabilities for the IHT400. Key practical points: (1) Obtain final statements for all accounts at the date of death: mortgage outstanding balance; credit card final statement; all loan agreements; any tax liabilities (request from HMRC/SA). (2) Do NOT include contingent liabilities unless they were called/enforceable at the date of death: a guarantee not yet called is not deductible (or deductible at a discounted value — seek specialist advice). (3) Funeral expenses: keep all receipts and invoices. Claim the full reasonable amount. (4) Review old wills for any outstanding debts to beneficiaries: if the deceased owed money to a family member (documented as a loan, not a gift), this is deductible. If the debt was in fact a gift dressed up as a loan: s103 IHTA anti-avoidance applies. (5) Review the s162B/C position: if the deceased held BPR-qualifying assets (AIM shares, business interests) or excluded property (for non-doms), check whether any outstanding loans were used to fund those acquisitions — the liability deduction may need to be applied against the BPR property first under s162C IHTA. (6) IHT400 schedules: liabilities are reported on the IHT400 itself and on IHT404 (jointly owned assets — liabilities on jointly owned property) and IHT405 (land and buildings — mortgages). (7) HMRC enquiries: HMRC routinely enquires into large liability deductions, particularly connected-party loans and large artificial arrangements — be prepared with documentation showing the liability was genuine and for money's worth.
Frequently Asked Questions
Do debts reduce the inheritance tax estate?
Yes — allowable liabilities (debts) are deducted from the gross estate value to give the net estate for IHT purposes (s5(3) IHTA 1984). Allowable liabilities (s162 IHTA): debts incurred for money or money's worth — mortgages, credit cards, personal loans, overdrafts, tax arrears, court judgments, business debts personally owed. Funeral expenses (s172 IHTA) are also deductible (reasonable amounts). NOT deductible: artificial liabilities created to reduce IHT (s103 IHTA anti-avoidance); debts used to fund BPR/APR qualifying property — must be deducted from the BPR/APR asset first, not the general estate (s162C IHTA Finance Act 2013); debts used to fund excluded property — deducted from excluded property first (s162B IHTA Finance Act 2013).
Does a mortgage reduce inheritance tax?
Yes — an outstanding mortgage is an allowable liability (s162 IHTA 1984) and is deducted from the gross estate value, reducing the taxable estate. A £400k mortgage on a £700k property reduces the estate by £400k, saving up to £160k in IHT (£400k × 40%). However, the mortgage also reduces the Residence Nil-Rate Band (RNRB): under s8H(4) IHTA, the RNRB is limited to the net value of the qualifying residential interest (property value minus outstanding mortgage). Example: property £700k, mortgage £400k: RNRB qualifying interest = £300k; RNRB capped at £175k (still in full, since £300k > £175k). Example 2: property £300k, mortgage £220k: RNRB qualifying interest = £80k; RNRB limited to £80k (not the full £175k). Equity release mortgages have the same effect on both estate value and RNRB.
What funeral expenses are deductible from the inheritance tax estate?
Reasonable funeral expenses are deductible from the IHT estate under s172 IHTA 1984. Deductible: funeral director's fee; coffin; ceremony and burial or cremation costs; flowers (reasonable amount); headstone or grave marker; a reasonable amount for the wake; charitable donation at the funeral (if customary and reasonable). NOT deductible: excessive or extravagant wake costs beyond what is reasonable; costs of events that go beyond a funeral. HMRC guidance (IHTM28001): 'reasonable' is judged in the context of the estate — a larger estate may reasonably support a more expensive funeral. Keep all receipts. The deductible amount is reported in the IHT400.
What are the Finance Act 2013 rules on liability deductions for BPR property?
Finance Act 2013 introduced s162C IHTA 1984 to prevent 'double-dipping' on Business Property Relief (BPR). The rule: if a liability (e.g., a loan) was used to acquire, maintain, or enhance property qualifying for BPR or APR, that liability must be deducted from the BPR/APR qualifying property value BEFORE relief is calculated — NOT from the general estate. Example: a £500k loan used to buy AIM shares qualifying for 100% BPR. Without s162C: AIM shares £500k — 100% BPR → £0 chargeable. Loan £500k deducted from general estate → double benefit. With s162C: deduct loan from AIM first → £500k AIM − £500k loan = £0 BPR property; general estate unaffected by the loan. Net result: no double benefit. This applies to deaths on or after 17 July 2013. Similarly, s162B IHTA: debts used to fund excluded property must be deducted from the excluded property (not the taxable estate).
Can HMRC disallow a liability deduction for inheritance tax?
Yes — HMRC can challenge and disallow liability deductions in several circumstances: (1) s103 IHTA 1984 (artificial liabilities): a liability created by a disposition that constitutes a transfer of value (or that is connected to one) is not deductible to the extent that the transfer was subject to IHT exemption or relief. This targets arrangements where the testator 'borrows' from a connected trust or family member where the 'loan' was funded by a prior gift. (2) s162B/C IHTA (Finance Act 2013): debts used to fund excluded property or BPR/APR property must be offset against those assets first — they cannot reduce the general taxable estate. (3) Lack of genuine consideration: if the 'debt' was not genuinely for money or money's worth (e.g., a family arrangement dressed up as a loan), HMRC will challenge it under s162 IHTA. (4) Statute-barred debts: debts no longer legally enforceable (e.g., statute-barred by the Limitation Act 1980) cannot be deducted even if the deceased considered them morally owed. HMRC actively reviews large or unusual liability claims and requests documentary evidence.
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