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Correctly identifying and deducting the deceased's debts is one of the most important steps in preparing an IHT400. Every genuine liability reduces the taxable estate, directly lowering the inheritance tax bill — but HMRC applies strict rules about which debts are allowable, and errors (in either direction) can cause problems.
IHT419 is the supplementary schedule to the IHT400 used to claim deductions from the gross estate for debts that the deceased owed at the date of death. Deducting these debts gives the net estate — the figure on which inheritance tax is calculated.
The basic principle is simple: the estate inherits not just the deceased's assets, but also their liabilities. Just as the estate must pay off a mortgage before the beneficiaries receive the property, those debts reduce the value available for inheritance — and therefore the IHT due.
Note that IHT419 covers debts other than mortgages, which are deducted on IHT405 (houses and land) directly against the relevant property. IHT419 covers all other liabilities.
The following debts are generally deductible on IHT419, provided they were genuinely owed at the date of death and are properly documented:
HMRC applies significantly greater scrutiny to debts owed to family members, friends, or connected parties. The concern is that artificial debts could be constructed to reduce the taxable estate without representing genuine liabilities.
To have a family loan accepted as an allowable deduction on IHT419:
HMRC has powers under the Inheritance Tax Act 1984 to disallow debts where they were not created in good faith, or where the repayment obligation was never genuinely enforced. Loans from close relatives that were never demanded back, or that had no set repayment schedule, are at risk of disallowance.
HMRC may require evidence that loans from family members were genuine — keep all correspondence, bank transfer records, and loan agreements. If a family loan was informal and undocumented, take legal advice before claiming it as a deduction. Incorrectly claiming a disallowable debt can result in penalties in addition to back-tax.
The following are not deductible on IHT419:
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For each debt claimed on IHT419, you should obtain a statement from the creditor confirming the balance at the date of death. This is important — the current balance will differ from the date-of-death balance as interest may have accrued and charges may have been applied after the death.
For each debt, note:
For jointly held debts (such as a joint overdraft), include only the deceased's share — typically 50% unless there is evidence of a different split.
Funeral costs are deductible from the estate for IHT purposes, but they are declared on the IHT400 main form, not on IHT419.
HMRC allows a deduction for reasonable funeral expenses. What is considered reasonable depends on the circumstances, but in 2026 HMRC typically accepts figures in the range of £4,000–£8,000 without question. Higher figures are acceptable where the costs are evidenced and appropriate to the deceased's circumstances.
Allowable funeral costs include:
Not allowable as funeral costs: a wake or reception held after the funeral (considered a personal cost), or travel costs of family members attending from abroad.
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